Thursday, 15 February 2018

Adding my uncertainty to your uncertainty – how to decide when there are conflicting signs

It’s always nice when a clinical assessment ends with a clear way forward.  If a child presents in the community with a severe exacerbation of asthma, there are clear guidelines for pre-hospital treatment and referral.  There is usually no dilemma in what to do if a child presents with fever and signs of meningitis to Primary Care.  Similarly, it is usually obvious what to do with a child brought with signs of an uncomplicated viral upper respiratory tract infection.

What is more challenging is when a child has conflicting or paradoxical signs and symptoms.  This is especially true when all the evidence points towards an illness that can and should be managed in Primary Care, yet one small piece of information is inconsistent.  What should you do with that?

Let me give an example:
A four year old boy presents with a history of diarrhoea and vomiting for 24 hours.  It is now 6pm.  The history of the illness is typical of a straightforward viral gastroenteritis.  The child looks well and is alert, interactive and surprisingly willing to mobilise when he spots the toys available.  He has wet mucous membranes and has no signs of dehydration.  Abdominal examination is normal as is the rest of his systemic exam.  All physiological observations are normal.  There is an unexpected snag: the parent with him reports that he has not passed urine since he went to sleep the previous night. 
So, with all but one piece of information in favour of a pathway that involves symptomatic management and oral hydration, what should one do?

Should this child be referred to Secondary Care?  I think you will get different answers from different people for this kind of situation.  On one hand the reported lack of urine output is a clear red flag.  On the other hand it is completely at odds with the wellness and clinical hydration of the child.  The child could be referred, but would that change anything?

There are many reasons for referring a child to Secondary Care.  I the initial examples, the reason is for undisputable and necessary management.  If the child is referred in the case of the paradoxical urine output, there may be an assumption that someone in the hospital will be better able to make a decision than the person making the referral.  This may or may not be true.  If it is true, it is probably not because they will have further information that could not have been obtained by the referrer.  It is probably not because the person receiving the referral has some sort of child assessment super power.  They may not even have more confidence in their gut feeling (that the child is fine and can safely be managed as an uncomplicated gastroenteritis) than the referrer.  What they will mostly have is their uncertainty to add to the referrer’s uncertainty.

Let’s say that you do refer this child.  Let’s assume that I see them shortly after you have seen them and that nothing has changed apart from the child having a bit more to drink in the meantime.  I now have the same information that you had and the same dilemma: to go one way or another.  I can do blood tests and consider intravenous fluids, but my gut tells me that this is an unnecessary torture of a child best managed with analgesia and oral fluids.  I could give symptomatic treatment advice and safety-netting advice and send them home but that is difficult to justify in the face of the reported anuria.  I could keep them for observation, but what would be the end point of that or the purpose.  If I am confident enough to do no active management in hospital, why am I keeping them?  Observing moderately unwell children while awaiting an expected move towards wellness is one thing but observing a well hydrated and clinically well child to prove that they are going to pass urine seems to have little value over allowing the same outcome at home.

When faced with conflicting information, it is important to have a way of deciding which information carries more weight and has more validity.  In ill children, it is often useful to categorise according to effort and efficacy. 

Effort is the body’s way of responding to illness.  There is usually some sort of physiological response to illness which is often a way of compensation for an effect of the illness.  Efficacy is everything to do with the end point of how effective the increased effort is.  In other words effort tells you that the child is trying to cope with an illness and efficacy tells you if it is working.  A good example is the happy wheezer.  If an infant with bronchiolitis has an increased respiratory rate, that tells you that there is some effort to compensate for what is happening in the chest.  The smile tells you that this is being effective.

Inevitably, efficacy is more important than effort when it comes to clinical decision making.  It’s not that the compensatory efforts should be ignored, it’s that the effect of that effort is of greater importance. 

So in this case, I would say that whatever is happening with this gastroenteritis, all the evidence that I can see tells me that it is having the desired effect.  The child is well and has no signs of dehydration.  Even if we were to believe the lack of urine output (and to disbelieve is not to disbelieve the parent) then a reduced urine output would be part of an effort to appropriately retain fluid during an illness.  I’ll say that is being quite effective in this case.

Do I have any niggling doubts?  I am certainly not dismissive of the contradictory report of anuria.  I am aware of my own fallibility and would only chose to ignore the lack of history of good urine output if I felt that to do so was in the child’s best interests.  In short, I would love complete certainty but I’m not being given that so I can either make a decision or find another way.  What I don’t want to do is a test or treatment that I don’t believe in.

But it isn’t strictly true that I’m no further forward than the referring clinician.  After all, I’ve got their uncertainty to add to my own.  If I’m lucky, it will be clear from the referral that when you referred this child for further assessment, you were very happy with the hydration and general wellness of the child.  You, like I am now, were perplexed more than concerned by the lack of history of passage of urine.

I have no super-powers and no particular clinical skills that you don’t have.  I am also lacking a 100% certainty about this case, but it’s time to make a decision.  Adding my certainty to your certainty means that between us we are 198% certain that there is nothing about this child requiring a blood test or a night on an intravenous infusion.  Let’s go with that then shall we?
There’s nothing wrong with referring a child for a further opinion when there is some uncertainty about the best management.  It is particularly helpful to know what the opinion is along with everything else in the referral.  That way I know that my uncertainty is the same, which in itself is useful information.

There’s also nothing wrong with trusting your assessment, in the knowledge that in secondary care we may well have little to add other than another appraisal of the same paradox.  Of course there is always the phone call to discuss the uncertainty.  How much fun would that be?

Edward Snelson
Medical astrologist
@sailordoctor

Disclaimer: I'm not even certain what I'm disclaiming.



Wednesday, 31 January 2018

A genuinely useful test - Blood sugar in acutely unwell children

When your patient is a child, the decision to do investigations is a complex one.  On one hand, it is often the case that at the end of history taking and examination there is some uncertainty which tempts the clinician to gather more information in the form of tests.  Parental anxiety might seem to be best managed through investigations either to demonstrate normality or to show that concerns have been taken seriously.

The reality is that these reasons for doing tests are all dubious and can achieve the opposite to the desired result.  There are few paediatric medical problems for which a test is more valid than clinical assessment.  For example, upper respiratory tract infections - If the symptoms are all well controlled by simple analgesia, what useful information could tests add?

Worse still, many tests are potentially misleading or might cause anxiety.  I like a full blood count as much as the next medic but goodness me don't they have a lot of information in them?  Does it mean something when the lymphocyte count is just below the reference range if the total white cell count is normal?  Sometimes the result can be alarming.  "Toxic lymphocytes" are a good example of something that you don't want to get on the lab report, especially when the child is climbing up the shelves in your consulting room while you try to work out how to answer the question, "Was the blood test result normal?"

But it's not all me, me, me.  The truly difficult part of all of this is that we should not use tests to reassure.  No matter how much another person wants a child to have a test for their own reassurance, we should only be doing tests which are in the best interest of the child.  Although a tough rule to live by, it is important to remember that the child is the patient, not the parent. 

The good news is that tests rarely tell you something of great value once a child has been clinically assessed.  Tests are most useful when they give you a number which has a clear clinical significance and where you could not have made a diagnosis without that test.  This criteria applies very nicely to testing blood sugar for an acutely unwell child, in certain curcumstances.  

Here are two cases where a simple skin prick glucose test has made all the difference:

Case 1

A three year old boy has been vomiting and febrile for 24 hours.  Clinically they are not dehydrated (they have wet mucous membranes, normal skin turgor, their eyes are not sunken and they are passing urine reasonably well) and they are neither septic nor meningitic.  In fact what is odd about them is that they seem subdued and grumpy despite having a normal heart rate and normal temperature.

Blood sugar is tested and found to be significantly low.

Why do unwell children get low blood sugar?  This happens for one of two reasons.  The most common reason is that the child has exhausted their available supplies of glucose.  The child's body has a limited reserve and if consumption exceeds supply then the child will eventually run out of glycogen, the most readily available way of mobilising energy in times of need.

The second possible reason is that the child has a metabolic problem.  Some children have a disorder in their metabolism which is normally masked by the almost constant supply of carbohydrate that they receive.  When this supply is interrupted, it unmasks the fact that one of the chemical pathways (needed in times of crisis) is faulty.  No plan B, no blood sugar.

How do children with low blood sugar look?  The brain is a complicated thing but it runs on two main things: oxygen and sugar (or backup substances but let's keep this simple).  If a child has a low blood glucose then the first signs are usually neurological.  Most commonly the child is not fully alert and is often unhappy.  I believe the term is hangry.  They will be less active but they may also be combative.

How should low blood sugar be treated?  The first thing to mention here is a pitfall.  Do not use glucagon to treat hypoglycaemia in children when the reason for their low blood sugar is that they have run out of reserves.  It simply won't work.

If the child is able to swallow safely, they can be given a sugary drink.  If not then what happens next depends on where you work.  If you are outside of a hospital setting, then a glucose gel rubbed into the oral mucosa will be a good plan.  In hospital, most places will give an intravenous bolus of dextrose 10%.  (ALSG recommends 2ml/kg) When the cannula goes in, there are usually some blood tests that need to be taken, depending on local guidelines.

The response to initial treatment should be assessed and further intervention given as needed.  If there is a good response, it is important to realise that this is not 'job done'.  To become hypoglycaemic, the child had to have exhausted their reserves, so a single bolus will have a very temporary effect.  It is essential to continue the carbohydrate supply, often in the form of maintenance intravenous fluids.


Case 2

A 5 year old girl presents with abdominal pain and vomiting.  They started being non-specifically unwell two days ago.  Yesterday they started having abdominal pains and overnight they started to vomit.  The child is drinking well and passing urine.

The child has no significant past medical history.  On examination the child is subdued and miserable.  The abdomen is soft.  The child is tachycardic but has a normal temperature.

When a blood glucose is checked, it reads three times the upper limit of normal.

Why do children get high blood sugar?  Although any significant illness can cause a moderately raised blood sugar level, hyperglycaemia of this magnitude always means diabetic ketoacidosis. (Well, that's not strictly true.  Occasionally it means that there is sugary residue from a drink or snack on the finger that was tested.  That's why you need to clean the finger first.)  Of course, it is possible (and preferable) to make the new diagnosis of type 1 diabetes before it gets as far as DKA.  If the blood sugar is high, type 1 diabetes should be the presumed diagnosis.

How does diabetic ketoacidosis (DKA) present?  DKA is a difficult diagnosis for all sorts of reasons:
  • Symptoms are somewhat non-specific.  Abdominal pain and vomiting are good examples.
  • DKA is rare and gastroenteritis is common
  • Clinicians tend to check that a child is drinking and passing urine enough, but may not ask if oral intake and urine output is excessive
  • The onset of symptoms can be surprisingly gradual.
  • While less common, type 1 diabetes can occur at very young ages.  Unsurprisingly, it is not the first diagnosis that people think of when seeing an unwell young child.

Most commonly, the illness is initially mistaken for a viral URTI or gastroenteritis.  Polyuria and polydipsia are unusual symptoms in a child with a viral illness who is significantly unwell and should be major clues.  Abnormal breathing is a feature of the acidosis and should also prompt the clinician to think of DKA.  However there is one feature that rather tidily applies to both high and low blood sugar: the child will be subdued and lethargic.

How should DKA or newly diagnosed type 1 diabetes be treated?

This is fairly specialised stuff so these children will all need to be referred.  The acute management of DKA is rather complicated and requires careful fluid management to reduce the risk of developing cerebral oedema.  According to the NICE guidelines (1), fluids should be the priority for the first 1-2 hrs after which insulin can be started for DKA.

As tests go, blood glucose is much more useful that many, and the result and meaning are usually clear.  Blood glucose is a test to go for in children who have atypical symptoms or are significantly subdued.  High or low, an abnormal result is a game changer and early recognition of the problem will make a huge difference.

Edward Snelson
Tricorder trainer
@sailordoctor

Disclaimer: While it would be wrong to do an unnecessary test on a child, it is perfectly acceptable to Feng Shui them. They then need careful monitoring to see the effect of the intervention.

Reference
  1. NICE guideline [NG18], Diabetes (type 1 and type 2) in children and young people: diagnosis and management

Thursday, 18 January 2018

Investigations in Bronchiolitis - Help a Brother Out

One of the things that a crisis should do is to bring people together.  As the UK's National Health Service experiences a winter that is bringing  it to it's knees, we should be more aware than ever that Primary and Secondary Care need to work together as a team so that we all come out the other end of this intact.  There are those in each camp that are so entrenched in the us-and-them mentality that this idea of teamwork is against  their very being.  If you think that General (family) Practitioners (GPs) are lazy idiots or you think that hospital doctors are arrogant and lack communication skills, I'm not sure that I've got anything to help you.  (Perhaps a hug?)  If you are willing to believe that we are all part of a team and that any divisions are both understandable and resolvable, read on.

The issues that cause division are (in my experience) usually due to misunderstanding and a lack of insight into the part that we play in creating these disparities.  The irritations that I cause my colleagues, whether in Primary or Secondary Care, tend to be completely unintentional.  Sometimes it can be what seems like the smallest thing and I have no idea of the impact it has on someone else.  That's why it's so important to talk to each other.

Let me describe an example: the seemingly simple act of requesting a chest X-ray for a baby with bronchiolitis.

Bronchiolitis is usually a set piece.  An infant, usually under 12 months old, gets inflammation in their airways during a viral respiratory tract infection.  This leads to a three to five day period of increasing symptoms that usually consist of cough, wheeze, difficulty feeding and increased work of breathing.  In practical terms, that might play out like this:

Monday - A three month old is snotty and coughing but well and feeding nicely.  Breathing will probably be normal at this stage.

Tuesday - The parents have now noticed some noisy breathing and that feeding isn't as good as it normally is.  like many people in these circumstances, they seek a medical opinion and so go to their GP.  They are seen and the diagnosis of bronchiolitis is explained.  The clinician advises frequent small feeds and gives safety-netting advice for what to look out for in case this child becomes one of the very small minority who develop breathing or feeding difficulties that require support as an inpatient.  In keeping with NICE guidelines (1), they do no tests and give no treatments.

Wednesday - The parents have noticed a slight worsening of the feeding and are unsure about whether this is bad enough to need something to be done.  They hold off doing anything during the day but when their baby refuses an evening feed they take their precious bundle to the local emergency department.  There the child gets a thorough assessment.  Clinically the infant is well hydrated and although they have wheeze and mild recession they are looking happy and have oxygen saturations of 95% in air. Despite the earlier feed refusal, they now take 100 mls of milk. The assessing clinician hears a few crackles in the chest and decides to do a chest X-ray, just to be sure that today's worsening symptoms are not due to a bacterial pneumonia developing.

When is it necessary to do a chest X-ray for babies with bronchiolitis?

There are many possible complications of bronchiolitis.  In theory, these should be apparent on a chest X-ray.  There are also conditions that mimic simple bronchiolitis, most notably congestive cardiac failure.  So, a chest X-ray seems a sensible thing to do to add value to the assessment.  Except that it doesn't, for two main reasons.

These are the reasons why a chest X-ray doesn't add value to the assessment of a typical presentation of bronchiolitis:

  • There is always something to be seen on the X-ray.  If you are looking for normal, you are unlikely to find it.
  • If the infant has bronchiolitis, that is enough explanation for their clinical condition.  If they had a complication such as lobar pneumonia as well, you would't be doing the chest X-ray to see if there is a problem, you'd be doing it because the child is seriously unwell.

Coming back to our little one with bronchiolitis, let's assume that the chest X-ray shows what it always shows in bronchiolitis - something of uncertain significance.  There will be a little fluffy shadow somewhere due to the mucous plugging and atelectasis that is part and parcel of bronchiolitis.  Often, there is something to be seen at the right heart border (or as a wise radiologist once redefined for me: "the area of radiological romance") which may or may not be something.  Once seen, it is very difficult not to feel the need to treat for possible bacterial infection.  This brings me on to the next few reasons for not doing a chest X-ray.

Doing a chest X-ray in bronchiolitis is associated with increased antibiotic prescribing rates.  Bacterial superinfection in bronchiolitis is rare and is usually clinically apparent.  Bronchiolitis is reason enough to have respiratory symptoms.  If a baby also develops pneumonia, they are usually quite unwell and have a marked degree of distress.  So, following that logic, for our baby the antibiotics are simply unnecessary, in which case they may do harm.  Since one of the problems that comes with bronchiolitis is feeding and hydration, why give these babies a gastric irritant?

Finally, there is a second victim here: the clinician who saw the baby on Tuesday.  Despite sterling work by the GP, the parents are likely to believe in retrospect that they were given a poor service.
All the evidence is there:

  • The person that they saw in the community did nothing and their child became worse.  
  • The experts in the hospital did a test which showed that their baby needed antibiotics.
  • Antibiotics were given and eventually the bronchiolitis got better. 

Why didn't the GP do something when we went the first time?

Of course both clinicians in this story were trying to do their best for the patient.  Neither of them had anything on their mind other than trying to ensure the best outcome for the child. There was no disrespect intended and no one wanted to cause anyone any problems.  We are all just trying to get through the day and to keep our patients safe and well.

Thankfully, it turns out that in bronchiolitis, keeping your patient safe and well is probably best done without the use of chest x-ray and antibiotics.  So, we in Secondary Care can help our colleagues in Primary Care out by making the assessment that needs to be made: in or out (of hospital)?  That decision is made on clinical grounds and if they need to be admitted, a chest X-ray may be useful.  Maybe.

Edward Snelson
Vice President of the Guild of Doing as Much Nothing as Possible
@sailordoctor

Disclaimer:  I did a chest X-ray for bronchiolitis once.  There was a white patch at the right heart border but it turned out to be tippex on the screen.

Reference

  1. Bronchiolitis in children: diagnosis and management, NICE guideline [NG9] Published date: June 2015



Tuesday, 5 December 2017

Something Old and Something New - Social Media and Young People's Mental Health

And now for something completely different...

While we tend to associate winter with infections and respiratory complaints in children and young people, it is also a time of increased mental health problems in young people.  It is often asked, "Is there a genuine rise in mental health problems in young people?  Are we just recognising it better?  Have we simply moved the goalposts so that what was once called normal is now labelled as mental heath problems?"  There has been an apparent increase in mental health problems in young people in the UK according to the best evidence.  Various factors are thought to be contributing, and the rise of social media use is one of these factors.

Allow me a story to give some context to the world in which we now live.  Since we are currently within the centenary of the first world war (WW1), this story I'm going to tell you is one of modern times.

Three months after the outbreak of WW1, a German warship, the SMS Emden, had been causing havoc in the Pacific.  She had captured or sunk ships running into double figures and the captain decided that it was time for the ship to have some repairs and the crew to get some shore leave.  He steamed into the island of Diego Garcia, which was at the time under the control of the British.  Despite being three months into a war between these two countries, not only was there no resistance from the British garrison but the local force welcomed the cruiser, helped with the repairs and presumably made them all tea.  Why?  Because the British Garrison didn't know that they were at war.  No information about the hostilities between the two nations had reached them.  True story.

Fast forward a few generations and think about the world that our young people live in.  Everything is fast, if not immediate.  Everything comes with an expectation (I know what a few dozen people think about the next hotel I'm going to stay in) and gets rated and reviewed.  One of the problems of modern times is that this is happening to our young people, not just to hotels and restaurants.  they are themselves being rated and given instant, sometimes brutal feedback every time they go online.

One of the known risks to mental health is any detrimental effect on self esteem.  If the world tells  a young person that they should be thin and beautiful and rich often enough, this has an effect on their self esteem.

Another problem that comes with social media is that it is a fickle friend.  Young people need to feel accepted or validated as part of a healthy psyche.  When something brings you down, it helps to have a solid person in your life to let you know that you are an OK human being.  Social media has made it possible for young people to be connected to hundreds of others.  The trouble is that what these 'friends' or followers say or don't say can be detrimental. Online interaction can be any degree of unpleasant and all varieties of negativity are seen in various forms.

Social media gives you a value.  How many online friends do you have?  How does that compare to other people?  How many 'likes' did your latest selfie get?  Why so few when someone else in your class got 300 likes?



The online world brings a great deal of opportunities for young people but it also brings risk.  If a young person is vulnerable to mental illness, then the negative effects of social media can be the trigger. (1)

What can be done about the risk?  If a young person is showing signs of mental health problems then we need to be able to offer helpful advice.  The debate about how to intervene is never-ending.  This week, Facebook was in the news for its new under 13 year old version of Messenger, which Facebook is currently testing.  Facebook argue that since 12 year olds simply pretend to be older online, it is preferable to have a safer version of Facebook, specifically designed for this age group.

Most discussions around the issue of social media and the risk to young people's mental heath centre around parental controls and managing the media.  Another way to approach the issue is to concentrate on everything but the social media itself.  Emphasise everything that is likely to have a positive effect on that young person's mental health:

  • Stable relationships
  • Positive family interaction
  • Affirmation
  • Participation in hobbies and sport

Many parents and carers find that it is an impossible or divisive task to police and interfere with a young person's social media use.  Parents need to know that they can intervene positively in their child's social media use.  However, if that seems to be exacerbating any stresses, it may be more constructive to fill the voids in that young person's life with things other than social media.

To return to the original question, mental health problems in young people do appear to be on the rise.  Recognition of mental illness is just one of the challenges that we face.  Prevention and treatment are seemingly unachievable within the resources available, however we need to take the issue of mental health as seriously as we do any other group of  childhood illnesses.

It is probably unnecessary to get caught up in a debate about whether social media is to blame for the rise.  Adolescence is a time of emotional vulnerability and any trigger can be to blame for a mental illness.  The negative effects of social media are one possible trigger.  We need to be aware of this and share this knowledge with families who present with concerns about the mental health or an adolescent.

Edward Snelson
Looking for validation elsewhere thankfully
@sailordoctor

Disclaimer:  Rather than my usual nonsense, I would like to allow myself a serious footnote.  Over the time I have been writing GPpaedsTips, I have noticed what gets the most and the least attention.  If I was to maximise the numbers of shares and clicks, I would never mention mental health ever again.  Although we should indeed be interested in treating asthma and sepsis, suicide remains a leading cause of death in young people (2) and the impact of mental health problems in adolescence is massive.  Although I wouldn't normally ask, please share this post.  How else will I be a valid person if I don't get enough likes?  If I get enough clicks on this post, I promise to write about sepsis next time.
  1. O'Keeffe, G. et al, The Impact of Social Media on Children, Adolescents, and Families - Pediatrics April 2011, Vol 127, Issue 4
  2. Pearson. G et al, Why children die: avoidable factors associated with child deaths, Arch Dis Child (2010). doi:10.1136/adc.2009.177071

Thursday, 23 November 2017

Is Montelukast Too Easy?

How much does the acceptability of a treatment matter when compared to the efficacy of that treatment?  This is a decision that we all make, consciously or unconsciously when prescribing for children.

For example, ten to twenty years ago, it was not uncommon for children to be given salbutamol in a liquid preparation.  The decision to give this preparation (rather than via MDI and spacer) probably went something like this:
  1. A very small person is wheezy
  2. A parent wants a treatment for the wheezy small person
  3. It is difficult to give inhaled bronchodilators to small people
  4. There is a liquid preparation of salbutamol available
At the time, there was probably also an element of inertia which came from the era before the invention of the spacer.  Until spacers came on the market, liquid preparations were the only option for young children.  So despite the change in what was available, it is not surprising that some continued to use what  they had used previously.  Now, I never see children on salbutamol syrup.  Inhaled therapy is the best treatment option and ease of administration is overruled by the superiority of child-friendly spacer devices.

Ease of administration, acceptability of taste and lack of side effects all make a considerable difference to the effectiveness of medicines in children.  One of the most common examples of this is phenoxymethypenicillin, often used for suspected streptococcal throat infections.  It has a vile taste and is often rejected by the child after the first few doses.  It can't work if the child won't take it.  Fortunately it is often not needed, so it doesn't matter when the child votes with their feet.

By contrast, montelukast is one of the great success stories of child-friendly medicines of recent times.  It comes in a chewy tablet or sprinkles.  It's like being Dr Willy Wonka when you prescribe montelukast for children.

Acceptability is not the only factor when it comes to effectiveness.  There has to be a proven clinical efficacy.  Otherwise, montelukast becomes the salbutamol syrup of our generation.  Just because it's a medication for wheezy children doesn't mean it will work in every clinical scenario.  Just because it is easy to administer doesn't mean it should be the first line treatment.

A recent article in the Archives of Disease in Childhood (1) did an excellent job of exploring the evidence for montelukast as a treatment in the various phenotypes of childhood wheeze.  This was no mean feat considering how many there are and that these phenotypes are variously defined and hotly debated.

Here is a summary of what they found:

Bronchiolitis* and montelukast

Unsurprisingly, montelukast can be added to the list of things that don't work when a child under the age of two has wet, inflamed airways (without bronchospasm).  No doubt we will coninue to look for an effective treatment but so far nothing has worked.  The management of bronchiolitis remains the art of doing as much nothing as possible, while knowing exactly when to do something.

* Bronchiolitis is defined slightly differently in the UK  to the USA.  In the UK, it is mainly infants under the age of 12 months with wet lungs of viral aetiology who are given the label bronchiolitis.  In the USA, the definition includes young children with viral induced bronchospasm.  This is why the UK guidelines recommend that bronchodilators are not used, while the guidance in the USA is that they an be tried.

Viral Wheeze (Viral Episodic Wheeze) and montelukast

There is some conflicting evidence for the use of montelukast both as prevention and as rescue treatment for pre-school children who develop bronchospasm only when they get a viral URTI (i.e. no other triggers and no chronic symptoms).  However, a Cochrane review (2) did not find the evidence needed to support the use of montelukast as rescue therapy or as a preventative treatment for viral wheeze.  So it seems that it's not really useful for these children either.

Multi-trigger Wheeze (aka asthma in the under 5 year olds) and montelukast

If you weren't already aware, there is debate about whether children under the age of five should be diagnosed as asthmatic even when they have interval symptoms and wheezy episodes which are not exclusively triggered by viral episodes.  Some are calling this asthma and some call it viral wheeze.  Arguably, it doesn't matter too much what it is called so long as we use evidence based treatment and we avoid mislabelling children who do not fit this phenotype.  For example, it would be a mistake to say that viral episodic wheeze is the same as asthma since the latter benefits from inhaled corticosteroids (ICS) and the former does not.  With multi-trigger wheeze and asthma in the under five year-olds, we essentially have two names for the same clinical scenario.

The article in ADC notes that the BTS/SIGN guidance recommends leukotrine receptor antagonists (LTRAs) as the next step after low dose inhaled corticosteroids or as first line treatment where the ICS is not tolerated.

The authors go on to note that while there is good evidence for benefit in this group of children, the effects of montelukast are moderate and clinically inferior to ICS.  Also, there is no evidence to show that montelukast is effective above and beyond the benefit of ICS therapy.  So, if there is a treatment with good evidence for superiority, how badly does a child have to not tolerate that treatment before you reach for the next option?

Since effect and tolerance are both important factors in the efficacy of a treatment, we need to consider both factors.  Clearly if one factor is the same between two option, then the other is the deciding factor.  In the case of the asthmatic/ MTW three year old, you may be faced with a difficult choice:
  • Inhaled corticosteroids, which their parents are struggling to give
  • Montelukast which is clinically inferior to inhaled corticosteroids but which the child might happily take
If only we had a formula to help us decide...  So, I made one up.  After all, paediatrics is full of things that were invented by clinicians based on what they believed to be true.
So let's try this out.  Say that ICS therapy has a 90% likelihood of improving symptoms and that montelukast has a 20% likelihood.  Then say that parents will manage to give the montelukast every day and that they would manage to give the inhaled corticosteroids half of the time.  This gives us a BS cubed number of 0.11 for the steroid inhalers and 0.2 for the montelukast.

Although the formula is made up, the point is valid.  Efficacy and concordance are the key factors in determining effectiveness.  Since we can't change the efficacy of a treatment, we are only able to influence the concordance.  In the example given above, if we could improve the concordance then this is a complete game changer.  This is where a full team approach comes in.  The prescribing clinician can emphasise the superiority of ICS over other treatments.  The pharmacist can make a huge difference by a good explanation and demonstration.  This can all be reinforced by a practice nurse who reviews technique and encourages the use of the inhaler, giving tips and tricks about how to get the child to take their inhalers.

Persistence counts for a lot with inhaler therapies.  There are few (if any) children who immediately take to the idea of having a mask put on their face and few parents who find it easy to use the inhaler/ spacer combination well with a moving target to begin with.  In time, children come to accept that the inhalers will be given and parents usually find that giving them becomes easier.

If the easy treatment was also the most effective, that would be brilliant wouldn't it?  For some reason, that rarely seems to be the case.  Is montelukast too easy?  If it makes us choose it over trying everything possible to get the inhaled therapy to work, then the answer is yes.

So, choose the treatment with the biggest boom and maximise the sweetness of the delivery.  It that way, the child who will benefit gets the best possible treatment in the most effective way.

Edward Snelson
Order of the Philosophers of Mathematics
@sailordoctor

Disclaimer - although a made up formula, there is good reason for applying a factor to the concordance.  In very few cases does half the treatment have half the effect.  Small moves away from the centre of the therapeutic window of a drug make a very big difference to the effect that it will have.  I wanted to use a round number for simplicity but I would be willing to bet that the reality for most treatments lies somewhere between squared and cubed.  Wouldn't it be great if the answer was really that the factor was pie?

References
  1. Haq et al, Should we use montelukast in wheezy children? Archives of Disease in Childhood, October 2017
  2. Brodie M et al, Leukotriene receptor antagonists as maintenance and intermittent therapy for episodic viral wheeze in children Cochrane Database Syst Rev. 2015 Oct 19




Monday, 6 November 2017

A Paediatric Guide to Anatomy (Things You Should Know about Constipation and Urinary Tract Infection in Children)

Last week, Norfolk and Norwich University Hospitals announced the opening of the UK's first Senior Emergency Department.  A Senior Emergency Department is much like a Paediatric Emergency Department, except that this one will meet the needs of patients over the age of 80, instead of those under the age of 16.  The concept is the same - there is a specific patient group with a different set of needs and who present in different ways to the rest of the adult population.

Children have been able to access paediatric emergency departments for a long time now.  Children benefit from a child-friendly waiting area, an assessment that recognises the way that children are different from adults and treatment by clinicians who are specifically trained in child health.  Perhaps that makes it all sound very exclusive and mysterious.  What are these differences of which you speak?  Well, none of them are a great secret, but as is often the case, having something explained often helps it to be understood better, even if you already knew it.

So, here's something that you probably already knew, but was a fact that you hadn't necessarily known what to do with: Children have a considerable lack of body awareness. 

A child's approach to anatomy and physiology is fairly simple:  I eat, I wee and I poo.  I pick things up if I want them.  If I want to do any of those things in a different location then I move.  If the world isn't the way I want it to be, I make noises.

One of my top tips when teaching paediatric clinical examination is that children don't have a chest before they go to school.  To them, the space between mouth and stomach is presumably some sort of giant food processing area.  Functions like breathing and circulation only truly become a reality when a child is much older.  For that reason I never tell a young child that I am going to listen to their chest.  It only confuses them if you say that.  I tell them I am going to listen to their tummy and tell them what I can hear.  Usually, the answer is sausages.

Besides helping me to know what to say to children, my knowledge of their lack of body awareness is crucial when it comes to understanding visceral presentations in children.  The important thing to understand is that children seem mostly unable to recognise the significance of visceral symptoms.  In other words, the feelings in their bowel and bladder either make no sense to them, or they are unable to articulate these feelings.  For whatever reason, young children have a tendency to leave bowel and bladder symptoms unreported, and so the presentation of problems such as urinary tract infection (UTI) and constipation are always delayed.

Take this case history example:
A two year old child presents with a 12 hour history of dysuria and frequency of urine.  They have no fever or abdominal pain.

Well, that's all very well, but that's just not how it goes.  Let's try something more realistic:
A two year old presents with a three day history of fever.  The child first presented two days ago and was diagnosed as having viral gastroenteritis.  The child is vomiting intermittently.  There is no blood or bile in the vomit.  The child does not have diarrhoea.
Today the parents have noticed that their child is more unsettled and they think that the child has abdominal pain, although the child has not specifically said that their tummy hurts.

Why is it important to recognise this peculiarity of children?

The first reason is that we need to be aware that UTI is a diagnosis that we have to actively  seek in children.  UTI in younger children does not have specific (urinary) symptoms.  Instead, all of the features are those also found in the more common viral infections such as gastroenteritis or URTI.

This does not mean that all unwell children should have a urine tested.  Routine testing would be great if it were painless for the family and the clinician.  Neither of these things are true.  Getting an uncontaminated sample (a 'clean catch') is hard work much of the time.  Interpreting the results and making sense of conflicting information is a challenge once a sample is obtained.  For that reason I would not routinely ask for a urine sample in a child who has an obvious otitis media for example.

The things that make UTI more likely in children include:

  • previous UTI
  • abdominal pain/ tenderness
  • vomiting without diarrhoea
  • a report of odd smelling urine
  • absence of signs or symptoms of URTI
  • new urinary symptoms (enuresis, dysuria)

The second reason is that we need to be aware that both UTI and constipation are likely to be well established by the time they are diagnosed.   This means that in children, we have to take each of these diagnoses a little more seriously.

Although most children with UTI are well at presentation, they probably have an infection that is a little more than what would be considered cystitis.  They may not have a proper pyelonephritis yet, but they are likely to have a more established infection than a young adult would have.  It is for this reason that we need to make sure that we do pick up a diagnosis of UTI as early as possible.  Every day left untreated increases the risk of renal scarring.

With constipation, the significance of the way it presents is more to do with the length of treatment needed to resolve the problem than the urgency to start treatment (as with UTI in children).  By the time that the child and parent are aware of the problem, constipation is usually very well established.  The child's bowel has been full of stool for weeks or months.  The bowel is stretched, weak and insensitive.  Prune juice and porridge are simply not going to do the job of resolving the constipation by the time that a child gets as far as their first medical assessment.

At this point, a short course of treatment for constipation simply will not suffice to truly resolve the problem.  Macrogol laxatives (the treatment recommended by the UK's NICE guideline) will do a great job, in almost every case, of clearing out the bowel.  This is not the same as treating the underlying condition.  We need to continue treatment until the bowel has a chance to do its thing again.


The effective treatment of idiopathic constipation in children requires two things.  Firstly, it requires adequate doses the right laxative (I avoid lactulose) for as long as it takes to allow the return of strength, shape and sensation to the bowel.  The consensus on this is that this will take about six months of maintenance therapy to achieve.

The second thing needed is some sort of modification to lifestyle that will help to avoid the return to constipation once treatment is stopped.  Changing diet, fluid intake and toileting habits may make all the difference, once the treatment has given the child their normal bowel back.

So I would suggest that we never think in terms of 'just a UTI' or 'a little bit of constipation' in children.  The delay in presentation, coupled with the extra time it may take us to actually get to the diagnosis means that neither of these terms apply.

I suspect that this could all be applied to the elderly with a little modification, but I'm not about to start GPseniorsTips.blogspot.com.  I'll just leave that thought with my innovative colleagues at the Norfolk and Norwich University Hospitals.

Edward Snelson
Part-time Vicerologist
@sailordoctor

Disclaimer - While I know deep down that it would be a terrible idea, part of me wants to combine a Paediatric Emergency Department with a Senior Emergency Department.  I can imagine how the two patient groups would be quite good for each other.  And that folks, is why I should never be allowed to have ideas.






Thursday, 26 October 2017

Never Tell Me The Odds! (Does Atopy Matter When Making a Diagnosis in Children?)

The quote "never tell me the odds" is from the late great Han Solo.  His reckless approach to problem solving may not be the model that you strive for in clinical practice, but his attitude towards statistics is remarkably relevant in the context of diagnosing certain conditions in children.

Many of us have been taught to consider a personal or family history of atopy when making certain diagnoses in children.  Although it might seem like this is an important factor, the logic for including the history of atopy has several flaws.  It is notable that some guidelines are de-emphasising the value of such factors when considering a diagnosis of another atopic condition.

The first thing that is wrong with the use of the family history of atopy is that it is often itself wrong.  We know that many diagnoses of asthma in children turn out to be wrong and that people can misinterpret what they were told.  Were they given a diagnosis of asthma or were they told that their symptoms could possibly be due to asthma.  Many patients don't understand what a maybe diagnosis is, no matter how comfortable we are with the concept.  Similarly, there is much overdiagnosis of allergy, especially antibiotic allergy.  The end result of all this is that there are many people with a history of an atopic condition but who never had that condition.

It is also worth factoring in that (depending on which study you read) there is a significant possibility that the stated father is not the biological father.  It's not a major factor, but if we're going to consider odds, it is a factor.

The most important argument for me is to do with the way that the diagnosis is made.  The question is, do you rely on something in the history in order to make a diagnosis?  For example, a child presents with a fever and no clear focus.  They have never left the UK in their life, so that pretty much rules out malaria.

Conversely, a ten year old child presents with a history of recurrent wheeze.  This seems to have multiple triggers and is no just related to viral infections.  The wheeze responds well to inhaled salbutamol.  The child has never had eczema and neither parent has any history of any atopic conditions.  Well that rules out asthma then doesn't it?  Of course not.

The idea that a personal or family history of atopy should be a deciding factor may well be responsible for much of the overdiagnosis of certain conditionsFor example, a three year old presents with four episodes of wheeze in the space of a few weeks.  Each episode has been preceded by a runny nose and each has resolved over the course of a few days, with only a salbutamol inhaler for symptomatic treatment.  The child's parent asks if the child has asthma.  Both parents were given a diagnosis of asthma in childhood.  Also, this child had eczema as a baby.

Already I can feel the gravitational pull of the asthma diagnosis.  The personal and family history of atopy feel like compelling evidence, especially if we are slightly unsure about a diagnosis.  However, it doesn't change the fact that the clinical picture is one of viral wheeze and not asthma.  For this reason, the British Thoracic Society guidelines have de-emphasised the importance of the family history of atopy in diagnosing asthma in children. "The diagnosis of asthma in children and adults is based on the recognition of a characteristic pattern of respiratory symptoms, signs and test results and the absence of any alternative explanation for these." (1)

When it comes to uncertain diagnoses, we are rarely more unsure of ourselves than when considering a diagnosis of non-IgE cow' milk protein allergy (CMPA).  It doesn't help that there is no test that we can rely on or that the symptoms are all non-specific.  CMPA, more than most diagnoses, relies very much on the recognition of a best-fit.  Often and quite rightly, it is a diagnosis which is considered after other more likely diagnoses have been initially presumed.  Should the infant having eczema or a parent with a history of atopy influence that process?

I think that there is no simple answer to this.  What is certainly true is that just because a baby has eczema does not mean that their crying and regurgitation of feeds indicates a CMPA.  Conversely, just because a child has no eczema and no family history of atopy does not mean that we should delay a cow's milk protein free trial if the clinical scenario suggests CMPA as a diagnosis.

What you really want to know now of course is the increase in statistical probability of CMPA which is associated with eczema and family history of atopy.  I don't know the answer to that. If you know, keep it to yourself.  Never tell me the odds.

Edward Snelson
Epidiminihilist
@sailordoctor

Disclaimer - Han Solo's death is in no way proof that you should know the odds.  His long and successful career is proof enough that reckless and uninformed decision making is the best way to go about things.
  1. British guideline on the management of asthma, British Thoracic Society & Scottish Intercollegiate Guidelines Network