seasonal/winter illness focusing on acute winter illness in children dr shane campbell paediatric...
TRANSCRIPT
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Seasonal/Winter Illness Focusing On Acute Winter Illness In Children
Dr Shane CampbellPaediatric Anaesthetist
PICU & Paediatric Retrieval, Glasgow
5th November 2015
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Topics
Acute Winter Illness In Children Bronchiolitis Croup
Management Expectations
Important Differential Diagnosis
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Acute Winter Illness In Children
Colds Asthma Norovirus Paraflu Flu
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Acute Winter Illness In Children
Bronchiolitis; RSV Non-RSV
Adenovirus, metapneumovirus, rhinovirus, enterovirus, mycoplasma pneumoniae)
Croup
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Bronchiolitis – Topics to discuss
Diagnostic characteristics
Seasonality
Risk factors for severe disease
Assessment and referral
Investigations
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Bronchiolitis – Topics to discuss
Treatment
Symptom duration and hospital discharge
Limiting disease transmission
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Bronchiolitis – Introduction
UK definition A seasonal viral illness characterised by fever,
nasal discharge and dry, wheezy cough A clinical diagnosis based on Hx and
examination
O/E Fine insp. crackles &/or high-pitched exp.
wheeze
Likely to deteriorate clinically in the first 72h
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Bronchiolitis - Background
Caused by Respiratory Syncitial Virus (RSV) in 75% of cases
70% of all infants will be infected with RSV in the first year of life
22% develop symptomatic disease In Scotland
translates into 15,000 infants per year ~2,000 infants <1yr old admitted to hospital
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Bronchiolitis - Background
RSV-attributed death rate in infants 1-12 months old is 8.4 per 100,000
~ 1-2 deaths per year in Scotland
20% of infants with bronchiolitis proceed to grumbling, protracted resp. syndrome with cough and recurrent viral wheeze
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Bronchiolitis –Diagnostic characteristics Age
Mainly infants <2yrs 90% of those hospitalised are <12 months
Fever May be present Rarely high (31% >38°C) 71% of febrile infants had a severe disease
course
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Bronchiolitis – Diagnostic characteristics Rhinorrhoea
Can be one of the first symptoms
Cough Dry and wheezy
Resp. rate Important to pick up an increased rate
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Bronchiolitis
Respiratory Rate (APLS normal values)
Newborn 40-60 1m 30-50 3m 30-45 6m 25-35 1y 20-30 2y 20-28
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Bronchiolitis – Diagnostic characteristics Poor feeding
Often the reason for hospital admission
Increasing WOB & recession Dyspnoea, subcostal, intercostal &
supraclavicular recession are commonly seen May be visibly hyperinflated (c.f. pneumonia)
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Bronchiolitis – Diagnostic characteristics Crackles/crepitations
Fine inspiratory common If present - hallmark of bronchiolitis in UK
Wheeze Exp. wheeze common
Apnoea Can be the presenting feature in the very young,
premature and low birthweight infants
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Bronchiolitis - SeasonalityFigure – RSV lab. reports to Health Protection Scotland by 4-week period
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Bronchiolitis – Demo.
https://www.youtube.com/watch?v=RFwr_zbgJII
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Bronchiolitis –Risk Factors for Severe Disease
Age The very young
Significant co-morbidities Prematurity (<35/40) Congenital Heart Disease Chronic Lung Disease of prematurity
Atopy No evidence of atopy being a risk factor
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Bronchiolitis –Risk Factors for Severe Disease
Social Factors
Breast-feeding reduces the risk of hospitalisation
Parental smoking increases the risk of hospitalisation
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Bronchiolitis –Risk Factors for Severe Disease
Social Factors cont’d
Number of siblings & nursery/day care attendance
Siblings at home increase the risk of hospitalisation
Socioeconomic deprivation one study demonstrated an association
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Bronchiolitis – Severe Disease
Poor feeding <50% usual fluid intake in preceding 24h
Lethargy History of apnoea RR >70/min Presence of nasal flaring &/or grunting Severe chest wall recession Cyanosis
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Bronchiolitis – Referral
Any of the indicators of severe disease above SpO2 ≤94% Uncertainty regarding the diagnosis Rapidly worsening picture To seek reassurance about the documented
clinical course +/- treatment, if unsure
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Bronchiolitis –Indication for HDU/PICU consultation
Failure to maintain SpO2 >92% with increasing O2 therapy
Deteriorating resp. status with signs of increasing resp. distress &/or exhaustion
Recurrent apnoeas
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Bronchiolitis - Investigations
SpO2
Blood Gas Only usually in those who are tiring or entering
resp. Failure
CXR Perform if diagnostic uncertainty In bronciolitis, usually clear but hyperinflated
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Bronchiolitis - Investigations
Virology testing NPA testing for RSV
Bacteriological testing Not specifically indicated
Haematology & Biochemistry Not specifically indicated
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Bronchiolitis - Treatment Supportive
Sit the child up
Nasal clearance, if blocked with secretions
O2 if SpO2 below 95%
High index of suspicion for deterioration unless you see an improvement
Low threshold for referral in Remote & Rural areas esp. in those with risk factors for severe disease
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Bronchiolitis - Treatment
NOT specifically indicated Anti-virals Antibiotics Inhaled bronchodilators (β2 agonists,
anticholinergics) Inhaled adrenaline Inhaled or systemic steroids Leukotriene receptor antagonists
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Bronchiolitis –Symptom duration & hospital discharge
From the onset of acute bronchiolitis ~ 50% of infants without co-morbidities are asymptomatic by 2 weeks
Symptoms can last beyond 4 weeks
Monitor SpO2 for 8-12h after stopping O2
Discharge only after maintaining >75% daily intake
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Bronchiolitis –Limiting disease transmission
RSV Highly infectious Transmitted through contagious secretions or
environmental surfaces In resp. droplets, can spread up to 2m Can survive up to 6-12h on surfaces Destroyed by soap and water or alcohol gel
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Okay, we’ll now move on to Croup
https://www.youtube.com/watch?v=d8k-4GI429o
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Croup – diagnostic characteristics
Croup (virally-induced laryngotracheitis) Most commonly parainfluenza virus
Most commonly affects children 6m – 3y Peak incidence 12 – 24m
Sudden onset of seal-like barking cough
Usually accompanied by inspiratory stridor
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Croup – diagnostic characteristics
Hoarse voice
Respiratory distress (due to upper airway obstruction)
Symptoms usually worse at night
May be pyrexial up to 40°C
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Croup – diagnostic characteristics
Often a preceding history of 1-4 days of a non-sp. cough, rhinorrhoea and fever
Most children will have mild croup and can be managed at home
Are not usually toxic
Should not drool continuously
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Croup – Severe Disease
Frequent barking cough with prominent insp. stridor at rest
Marked sternal wall recession Significant distress and agitation, or lethargy
or restlessness (hypoxia) Tachycardia
With more severe obstruction and hypoxia
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Croup – Assessment
ABC approach SpO2
Stridor Chest recession Resp. rate HR, Cap. refill time Conscious level
DO NOT examine the throat or distress the child
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Croup – Consider admitting to hospital if...
History of severe obstruction, previous severe croup, know structural upper airways abnormalities (laryngomalacia, vascular ring, tracheomalacia, Down’s syndrome)
<6m old
Immumocompromised
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Croup – Consider admitting to hospital if...
Inadequate fluid intake
Poor response to initial treatment
Uncertain diagnosis
Your clinical acumen predicts a poor trajectory
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Croup - Treatment
Steroid
Beneficial in mild, mod. & severe croup
Literature recommends 0.15mg/kg po dexamethasone (i.e. 1mg/kg pred. or
4mg/kg hydrocort.) As a single dose
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Croup - Treatment
Steroid
PICU routinely advises 0.6mg/kg po dex. (i.e. 4mg/kg pred. or 16mg/kg
hydrocort.) Can repeat once if needed
Can take up to 6 hours before it works Need to keep the infant under close review
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Croup - Treatment
Nebulised Adrenaline Usually only for severe croup Can be given in mod. croup if worsening 5mL of 1:1,000 This child should not be in a remote / rural setting
O2
Only needed for mod.-but-worsening or severe cases
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Croup - Treatment
Anti-pyretics / Analgesics Paracetamol &/or ibuprofen No need for tepid sponging or over/under-
dressing
Ensure adequate fluid intake
Humidified air/Steam inhalation The is NO ROLE for this
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Croup - Treatment
NO ROLE for the following; Cough medicine Decongestants β2-agonists (e.g. Salbutamol) Antibiotics (unless additionally there is a
secondary bacterial infection)
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Croup - Prognosis
Usually Self-limiting Resolves within 48h May last for up to a week Resolution can be accompanied by a upper
RTI
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Differential diagnosis
Acute FB aspiration
Acute anaphylaxis
Bacterial upper airway infections Tracheitis Epiglottitis
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Differential diagnosis
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Expectations from a R&R setting
• Realisation that you work with limited resources in an isolated environment
Acute Hospital expects; Deal appropriately with mild cases Refer as soon as it’s realised that the mild is
progressing to moderate or severe
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Expectations from a R&R setting
Retrieval Service expects;
When a child has been accepted for transfer, (s)he should not be left without medical supervision
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Expectations from a R&R setting
Retrieval Service expects;
Carry out instructions given by retrieval team; At least one point of iv access (unless advised
against) O2 titrated to SpO2
~70% maintenance iv fluids with isotonic fluids Usually 0.9%NaCl & 5% Dextrose +/- 10mmol KCl
per 500mL In the very young may use 10% Dextrose (we will
advise) Prepare for a potential resuscitation scenario
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Differential diagnosis of an Acute Winter Illness Asthma Pneumonia Congenital lung disease CF Inhaled FB Sepsis Metabolic acidosis
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An important differential diagnosis
*Not to be missed*
Cardiac failure Many causes (e.g. Congenital heart disease) Must think of it
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Cardiac Failure - recognition
Cardiac failure;
Rapid breathing
Desaturated (may/may not look cyanosed)
Failing to thrive
Fatigue (esp. with activity)
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Cardiac Failure - recognition
Cardiac failure;
Feeding difficulties
Cool peripheries &/or mottled
Restless/handles poorly
Murmur (may not be present)
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Cardiac Failure
Causes;
Neonates and younger infant most likely related to structural heart disease systemic or pulmonary circulation may depend on
the patency of the ductus arteriosus
Older infant/child myocarditis or cardiomyopathy, hypertension,
renal failure, arrhythmias or myocardial ischemia
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Key-learning points
Bronchiolitis Non-toxic infants ~70% of febrile infants will need O2
Supportive treatment
Croup Non-toxic infants Steroid and nebulised adrenaline treatment
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Key-learning points
Bronchiolitis and croup Always think of FB aspiration Always entertain cardiac failure
Monitor closely for deterioration
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Please...
Never EVER forget that we are here to help and support you do the best for children under your primary care, so...
USE US!
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References
SIGN Guideline 91 – Bronchiolitis in children http://www.sign.ac.uk/pdf/sign91.pdf (full guideline) http://www.sign.ac.uk/pdf/qrg91.pdf (2-page ref. guide)
NICE Guideline Clinical Knowledge Summary (CKS) September 2012 http://cks.nice.org.uk/croup
NHS Greater Glasgow and Clyde, Clinical Guideline: Emergency Medicine - Croup http://www.clinicalguidelines.scot.nhs.uk/Emergency%
20Medicine/YOR-AE-008%20Croup.pdf