Through the looking glass

Cite this article as:
Andrew Tagg. Through the looking glass, Don't Forget the Bubbles, 2016. Available at:
https://doi.org/10.31440/DFTB.9685

As we head out winter in the southern hemisphere the northern hemisphere can see that ‘Winter is Coming’ and with it the scourge of the paediatric emergency departments – bronchiolitis.  It’s one of those diseases that the we should all be able to spot but the real challenge is picking up those that present as if they have bronchiolitis but in fact have a different disease entity altogether. 

Asthma for Ambos

Cite this article as:
Andrew Tagg. Asthma for Ambos, Don't Forget the Bubbles, 2016. Available at:
https://doi.org/10.31440/DFTB.9592

Tonight I had the privilege to talk to the team at the Werribee branch of Ambulance Victoria. I was given the brief to talk on something to do with paediatric respiratory problems and I thought I would focus on one of their most common presentations – asthma.

Whoop, Whoop, Hooray

Cite this article as:
Andrew Tagg. Whoop, Whoop, Hooray, Don't Forget the Bubbles, 2016. Available at:
https://doi.org/10.31440/DFTB.8344

Henry Goldstein wrote an excellent article on pertussis a few years ago.  With some interesting new data coming to press with regard to risk factors for complications of the disease we thought it might be worthwhile doing some spaced repetition.

“My childhood was full of deep sorrow – colic, whooping cough, dread of ghosts, hell, Satan, and a deity in the sky who was angry when I ate too much plum cake” – George Eliot

Although cases have been described as far back as the Middle Ages it wasn’t until 1906 when the organism, Bordetella pertussis, was isolated by Bordet and Gengou. Up to 16 million cases develop worldwide every year with the majority of cases being in the developing world. Australia reported around 10,000 cases in 2009. Data from 2013 suggests it caused at least 61,000 death worldwide though this is likely to be a gross underestimate. Pertussis is one of the leading causes of vaccine preventable deaths worldwide.

Incubation

B. pertussis is highly infectious with the majority of exposed household contacts becoming infected to various degrees. The incubation period is usually quoted as 4-21 days with the average being 7-10 days.

Prodrome

Before the harsh coughing begins there is often a couple of weeks of symptoms that could easily be mistaken for a viral upper respiratory tract infection. Children may have a runny nose and a very mild tickly cough. This is the catarrhal phase. The classic ‘whoop’ might not be hard until week three or four of the illness.

Clinical course

The classical presentation is of a patient that has paroxysms of coughing that terminates in an audible inspiratory ‘whoop’. Like most classical presentations we learn about in medicine this presentation is rarer than we think. Children may also present with a protracted cough, or forceful post-tussive vomiting. Parents often seek advice as their children have had a couple of courses of antibiotics with no improvement in cough. It’s not know as the ‘one hundred day cough’ for nothing.

People with pertussis (adults and children alike) are infectious from the beginning of the catarrhal stage through to the third week after the onset of the paroxysmal stage of coughing. They cease being infectious five days after a course of antibiotics.

Diagnosis

Other than a suspicious clinical picture, formal diagnosis is best made by performing PCR for Bordetella on a nasopharyngeal swab. Once the initial three weeks have past though, it becomes increasing difficult to culture and it may be necessary to use rising IgA titres to make the diagnosis though this does not affect management.

Treatment

A number of treatments have been posited including vitamin C injections.

“In 66 [of 81] cases… [we saw] reduction of lip cyanosis in coughing attacks…[disappearance of] attacks with breathing difficulty, vomiting and recurrence … also the number of cough attacks diminished. Patients became lively, had good appetite and the convalescence progressed very satisfactorily.” – Concerning the Vitamin C Therapy of Pertussis [Whooping Cough]: Otani, Klinische Wochenschrift, December 1936

Coughs last, on average, 16 days. A Cochrane review found no specific benefit of steroids, bronchodilators or immunoglobulins for the treatment of the cough. Over the counter remedies are unlikely to help and may potentially cause harm.  To hear more listen to this great rant from Dr Anthony Crocco. The only thing that may help (a little) is honey.  Take a listen to Ken Milne’s podcast SGEM #26 – Honey, Honey for more on this subject.

What about antibiotics? Well (in adults) they are recommended in the initial catarrhal phase to help reduce duration of infectivity but they don’t seem to have much effect after the disease has been hanging around for three weeks. Because of this they are not recommended beyond this time period.

If they are needed then macrolides such as erythromycin, azithromycin or clarithromycin are recommended. Azithromycin should be used in children less than one month of age as erythromycin use has been linked to an increased incidence of hypertrophic pyloric stenosis.

Complications

Pertussis is far from benign in unvaccinated infants. According to the CDC, in children under 1 that are not fully vaccinated:-

  • 1 in 4 (23%) get pneumonia
  • 1 in 100 (1.1%) will have convulsions
  • 3 out of 5 (61%) will have apneoic episodes
  • 1 in 300 (0.3%) will develop encephalopathy
  • 1 in 100 (1%) will die

In Winter’s retrospective analysis of US pertussis deaths in infants under 120 days old mortality was linked with:

  • Significantly low birth weight
  • Younger gestational age
  • Younger age at onset
  • Higher WBC and higher lymphocyte count

In those less severely affected it may still cause sub-conjuctival haemorrhages, rib fractures and loss of bladder control.

Post-exposure prophylaxis

So who should get antibiotics if exposed to a confirmed case of pertussis? Most guidelines recommend that the following groups of people receive antibiotic prophylaxis.  It’s not really to treat the illness but rather to halt the spread.

  • Pregnant mothers in the last month of gestation (WHY)
  • Members of a household that has an  infant that is not fully vaccinated
  • Healthcare workers and babies potentially exposed and in a newborn nursery environment

To be fully vaccinated the child must have three effective doses of pertussis vaccine given at least four weeks apart.

Prevention

Whilst childhood immunisation does prevent the majority of cases, individual immunity does appear to decrease with time so there has been an upswing in the number of older children and teenagers affected. Pertussis is a notifiable disease and over 70% of cases that are notified are in patients over the age of 15.

The current Australian immunisation schedule has pertussis vaccine being given as a part of the combined Diptheria, Tetanus, acellular Pertussis (DTaP) vaccine at two, four and six months of age. Other countries may have an alternative schedule. The child then receives a pre-school booster at 4 years old. Because of the waning immunity they should also receive a dose in their teenage years. An individual’s immunity to pertussis may well have disappeared by the time they reach adulthood so new parents, or grandparents living in a house with a newborn should be offered a booster.

 

HT to Tim Horeczko (@EMtogether) for the heads up regarding the latest data

 

References

Royal Children’s Hospital, Melbourne guidelines on Pertussis can be found here

Cherry JD. Historical review of pertussis and the classical vaccine. Journal of Infectious Diseases. 1996 Nov 1;174(Supplement 3):S259-63. full text here

Pertussis (Whooping cough) complications. (2015). Retrieved April 13, 2016, from https://www.cdc.gov/pertussis/about/complications.html

GBD 2013 Mortality and Causes of Death Collaborators. “Global, Regional, and National Age-Sex Specific All-Cause and Cause-Specific Mortality for 240 Causes of Death, 1990-2013: A Systematic Analysis for the Global Burden of Disease Study 2013.” Lancet 385.9963 (2015): 117–171. PMC. Web. 14 Apr. 2016.

Forsyth K, Plotkin S, Tan T, von König CH. Strategies to decrease pertussis transmission to infants. Pediatrics. 2015 Jun 1;135(6):e1475-82.

Hay AD, Wilson A, Fahey T, Peters TJ. The duration of acute cough in pre-school children presenting to primary care: a prospective cohort study. Family Practice. 2003 Dec 1;20(6):696-705

Winter K, Zipprich J, Harriman K, Murray EL, Gornbein J, Hammer SJ, Yeganeh N, Adachi K, Cherry JD. Risk factors associated with infant deaths from pertussis: a case-control study. Clinical Infectious Diseases. 2015 Oct 1;61(7):1099-106.

 

PAC conference – Long on High Flow Oxygen Therapy

Cite this article as:
Tagg, A. PAC conference – Long on High Flow Oxygen Therapy, Don't Forget the Bubbles, 2015. Available at:
https://dontforgetthebubbles.com/pac-conference-long-on-high-flow-oxygen-therapy/

We have teamed up with APLS to share the videos from their Paediatric Acute Care Conferences. These videos have never been open access before, so if you weren’t able to attend the conferences, then now’s your chance to catch up.

The PAC Conference is run each year by APLS and consists of presentations on a range of topics relevant to paediatric acute and critical care.

Early Budesonide for the Prevention of Bronchopulmonary Dysplasia

Cite this article as:
Henry Goldstein. Early Budesonide for the Prevention of Bronchopulmonary Dysplasia, Don't Forget the Bubbles, 2015. Available at:
https://doi.org/10.31440/DFTB.7859

Bronchopulmonary dysplasia (BPD) is a common outcome in premature neonates, from 85% in 22/40 infants, to about 33% of neonates born in the 27th week of gestation. This recent study, published in the NEJM trialled a potential new therapy to reduce BPD.

DFTB in EMA #3 – Easing the Wheeze

Cite this article as:
Henry Goldstein. DFTB in EMA #3 – Easing the Wheeze, Don't Forget the Bubbles, 2015. Available at:
https://doi.org/10.31440/DFTB.7662

The team at DFTB had our third article published in the series for Emergency Medicine Australasia Journal.

Wheezing children commonly present to the ED. Bronchiolitis, preschool wheeze and asthma are common causes of such presentations. It is important to note that the term ‘wheeze’ is frequently misused by parents to describe a number of respiratory noises, including transmitted upper airway sounds and stridor.[1] Wheeze is, in itself, a symptom manifested by ‘a continuous whistling sound during breathing that suggests narrowing or obstruction in some part of the respiratory airways’.[2] One British study reported that 29.3% of children have had a wheeze by the age of three, and 30% of preschoolers with recurrent wheeze are diagnosed with asthma by 6 years of age.[3, 4] This article briefly reviews the diagnosis and management of preschool wheeze, while considering recent guidelines on bronchiolitis and asthma.

Click here to read the full article – “Easing the wheeze.”

Reference:

Goldstein, H., Tagg, A., Lawton, B. and Davis, T. (2015), Easing the wheeze. Emergency Medicine Australasia, 27: 384–386. doi: 10.1111/1742-6723.12463

From Cradle to the Grave – ACEM Annual Scientific Meeting 2014

Cite this article as:
Andrew Tagg. From Cradle to the Grave – ACEM Annual Scientific Meeting 2014, Don't Forget the Bubbles, 2014. Available at:
https://doi.org/10.31440/DFTB.6476

This years Australasian College of Emergency Medicine Annual scientific meeting in Melbourne has attracted over 900 delegates from all over the world. With an overarching theme of “Back to the Future” a number of speakers have been looking back on the past year in emergency medicine literature and predicting what might be up and coming in the next five years.  Whilst there have been a number of wonderful speakers talking about all aspects of emergency medicine the second day had a number of sessions that would be of interest to those practicing paediatric emergency medicine as well as those clinicians working in mixed adult and paediatric departments.  Some of the talks have been recorded and will be available on the ACEM website in due course, but one of the talks, by Simon Craig of Monash Medical Centre, stood out.

Asthma Exacerbations and Therapeutic Positioning

Cite this article as:
Henry Goldstein. Asthma Exacerbations and Therapeutic Positioning, Don't Forget the Bubbles, 2014. Available at:
https://doi.org/10.31440/DFTB.5300

The idea: Sitting erect vs slouching or slumping improves airflow in moderate-severe exacerbations of asthma

A pale, breathless 7-year-old with a known history of asthma presents to your department. Oxygen saturations are hovering in the mid-’80s with marked tracheal tug, subcostal, substernal, intercostal and supraclavicular recessions in addition to accessory muscle usage. He’s moving air and there’s a widespread wheeze throughout the chest. This child has a moderate-severe exacerbation of asthma.

In addition to commencing standard management including O2, salbutamol, steroids, IV access for a VBG (and considering some MgSO4), you notice that he’s sliding down the bed and curling into a ball.

The Therapeutic Guidelines for Asthma Management recommend nursing the patient sitting upright, but this can be quite challenging, especially if the child keeps sliding down the bed.

Anecdotally, I’ve seen more than a dozen children in this setting whose SpO2 has improved in less than a minute after adequate re-positioning, in adjunct to standard management.

To ameliorate some of these challenges, it’s my practice to prop children in order to remain sitting upright. I was first taught some of these tips by Dr. Tom Hurley, Paediatrician on Queensland’s Sunshine Coast, and added a few of my own. I’ll describe my method for positioning a child upright (and getting them to stay there!) in the context of an exacerbation of asthma.

You will need:

  • To first initiate standard management for asthma!
  • A bed that sits up and has rails.
  • 3-5 pillows/rolled up blankets or twice as many towels, rolled up.

What to do:

  1. Tell the child and parent what you’re going to do, and why it’s helpful.
  2. Make sure you can see as much of the anterior chest as dignified and practical; one of the main benefits of this positioning is that you can better observe the child’s work of breathing from the end of the bed.
  3. Ramp up the head of the bed to being almost straight up; most beds will top out about 70 degrees, which will be sufficient.
  4. Lift the child so their back is to the bed and their bottom is at the crease in the bed.
  5. Place a blanket under their thighs as a wedge; this will stop them sliding down.
  6. Additionally, if your supply of towels is plentiful, you can make a number of rolls side by side to the foot of the bed. This means the child can push on them with their feet.

Postioning for asthma exacerbation - lateral view

  1. Next, we want to prevent the child from slumping to either side.
  2. Put up the rails and wedge the pillows next to the child’s torso, across the width of the bed. For smaller children, you can place the pillows flat, for larger kids you might need to place them on their edge. Either way, they shouldn’t be able to crumple off to one side if they get exhausted or fall asleep.

Postioning for asthma exacerbation - anterior view

  1. Additionally, if you still have spare pillows, you can position the pillows to stop the child’s head from rolling side to side.
  2. Now, crack on with the rest of this child’s management!

Although I’m a bit uncertain on the science behind all this benefit, we’re taught in medical school about “tripoding”;  most of us are familiar with the ‘tripod prayer’ seen in adults with exacerbations of COPD. It’s just a theory, but I suspect that once in bed, children don’t adequately tripod.

Firstly, they just don’t know how to position themselves, either because breathlessness is a new sensation or they’re too young. Secondly, kids simply don’t have the levers to adequately tripod against their surroundings. Thirdly, once in a large hospital bed, the surroundings are soft and squishy, reducing the efficacy of uncoordinated tripoding. Fourthly, the improved PEFR in the erect vs supine position is well demonstrated in a number of experiments done in the 1960s and 1980s (see references). Lastly, the V/Q mismatch that occurs in asthma might further benefit from an upright position.

In the spirit of #FOAMPed, I thought I’d float this out there and see if anyone has other methods of optimizing positioning for these patients.

 

Selected references

Haffejee, I E., Effect of supine posture on peak expiratory flow rates in asthma. Arch Dis Child 1988 63: 127-129

Moreno F, Lyons HA. Effect of body posture on lung volumes. J Appl Physiol. 1961 Jan;16:27-9. https://www.ncbi.nlm.nih.gov/pubmed/13772524

Asthma – medical management

Cite this article as:
Tessa Davis. Asthma – medical management, Don't Forget the Bubbles, 2013. Available at:
https://doi.org/10.31440/DFTB.2815

A 9 year old boy is rushed into ED with what is clearly a severe exacerbation of his asthma. His sats are 80%, his RR is 60-70 and he is not looking great. You can hear some air entry with a bit of wheeze. He clearly needs some good treatment and he needs it quickly. Which drugs you choose?