Respiratory and ENT Flashcards
How can asthma be broadly split into two types?
1) Extrinsic - definitive external cause identified, most common in atopic individuals
2) Intrinsic / cryptogenic - no causative agent identified, usually late onset (middle aged)
What is the pathophysiology of asthma?
Increase in circulating IgE causes increased allergic atopic reactions
Reversible inflammatory disease of airways that responds to bronchodilators
List three features of asthma
1) Bronchial muscle contraction
2) Mast cell and basophil degranulation = inflammation
3) Increased mucus sectetion
List some triggers for asthma (5)
1) Drugs
- Beta-blockers = vasodilation and bronchoconstriction
- NSAIDS
2) Pollution / environmental allergens / dust
3) Cold air
4) Viruses
5) Physical exertion
List some risk factors for asthma (7)
1) Personal hx atopy
2) FH atopy
3) Triggers (eg pollen), dust, exercise, viruses, chemicals etc
4) Prematurity and low birth weight
5) Viral infections in early childhood
6) Maternal smoking
7) Early exposure to broad-spectrum abx
Breast feeding = protective
What is the triad of asthma symptoms?
Recurrent episodes of
1) Cough = worse at night
2) SOB
3) Wheeze
Ddx for wheeze:
Present from birth (3)
Shortly after birth (5)
Sudden onset in a previously well child (4)
Wheeze present from birth:
1) Presents immediately, constant wheeze without variation = structural abnormality eg bronchogenic cyst, vascular ring
2) Weak cry, stridor = laryngeal abnormality
3) Signs of HF = congenital heart disease
Wheeze shortly after birth:
4) Hx of prematurity or ventilation = bronchopulmonary dysplasia
5) Recurrent bacterial infections and FTT = immunodeficiency
6) Persistent cough and FTT, FH of chest disease = CF
7) Persistent nasal discharge and OM = ciliary dyskinesia
8) Vomitting and aspiration = GORD
Sudden onset in a previously well child:
9) Hx choking, unilateral reduced breath sounds = foreign body
10) Persistent wet cough = CF, bronchiectasis, recurrent aspiration, immunodeficiency, GORD
11) Finger clubbing, purulent sputum = CF, bronchiectasis
12) Focal signs in chest = developmental anomaly, post-infection, bornchiectasis, TB, foreign body
List the features of moderate acute asthma in a child <2yr
Moderate acute asthma:
- Able to talk in sentences
- SpO2 =/> 92%
- Peak flow =/> 50% best or predicted
- HR =/> 140bpm aged 2-5yr or 125 over 5yr
- RR =/> 40 aged 2-5yr or 30 over 5yr
List the features of severe acute asthma in a child <2yr
Severe acute asthma:
- Can’t complete sentences in one breath or too breathless to talk / feed
- SpO2 <92%
- Peak flow 33-55% best or predicted
- HR >140bpm aged 2-5yr or >125bpm over 5yr
- RR >40 aged 2-5yr or >30 over 5yr
List the features of life-threatening asthma in a child <2yr
Any one of the following in a child with severe asthma:
- SpO2 <92%
- Peak flow <33% best or predicted
- Silent chest
- Cyanosis
- Poor response effort
- Hypotension
- Exhaustion
- Confusion
What are the normal vital signs for:
1) Infant
2) 1-2yrs
3) 2-5yrs
4) 5-12yrs
5) >12yrs
1) Infant
HR: 110-160bpm
Systolic BP: 80-90mmHg
RR: 30-40
2) 1-2yrs
HR: 100-150bpm
Systolic BP: 85-95mmHg
RR: 25-35
3) 2-5yrs
HR: 95-140
Systolic BP: 85-100mmHg
RR: 25-30
4) 5-12yrs
HR: 80-120bpm
Systolic BP: 90-100mmHg
RR: 20-25
5) >12yrs
HR: 60-90bpm
Systolic BP: 100-140mmHg
RR: 14-18
What investigations should be performed for asthma? (6)
1) PEFR
2) Spirometry
3) Allergy testing
4) Exercise test
5) Bloods - Raised IgE and eosinophils
6) CXR
What is the stepwise management of asthma in children <12yrs?
1) Inhaled SABA
2) Inhaled corticosteroid (ICS): 200mcg / day
3) Add inhaled LABA (5yrs or over)
Add leukotreine receptor antagonist (LRTA) (<5yrs)
4) If only partial benefit: inc ICS to 400mcg / day
If no response: stop LABA and increase ICS to 400mcg / day
If control still inadequate: try LTRA
5) Increase ICS to 800mcg / day
OR consider addition of 4th drug eg theophylline
- Refer to respiratory paediatrician
6) Daily oral steroids = refer to respiratory paediatrician
Consider moving up ladder if using 3 or more doses of SABA per week
What is the stepwise management of asthma in children 12 yrs or over?
1) Inhaled SABA Inhaled corticosteroid (ICS) - 400mcg / day
2) Add inhaled LABA (usually combined inhaler with ICS and LABA)
If only partial benefit: increase ICS to 800mcg / day
If no response: stop LABA and increase ICS to 800mcg / day
If control still inadequate, try LRTA
3) Consider increasing ICS to 2000mcg
Or addition of 5th drug: LRTA, theophylline
4) Daily oral steroid and refer to specialist
What is the management of acute asthma in children?
O SHIT ME
Oxygen 15L/min Salbutamol NEB b2b Hydrocortison IV 4mg / kg Ipatropium NEB b2b Theophylline PO (or aminophylline IV) Magnesium sulphate IV Escalate
List types of bronchodilators and examples
1) Beta 2 agonist
- Salbutamol = Short acting
- Salmeterol = long acting
2) Anticholinergics
- Ipatropium
- Triotropium
3) Leukotriene receptor agonist
- Montelukast
4) Xanthines
- Theophylline = PO
[aminopyhlline is theophylline + ethylenediamine, given IV]
What is bronchiolitis? What age does It affected?
Acute viral infection of LRTI
Mostly ages 3-6 months (1/3rd have before age 1)
M>F
What is the cause of bronchiolitis?
80% due to respiratory syncytial virus (RSV)
What is the pathophysiology of bronchiolitis?
Initial URTI spreads to LRT = infection of bronchiolar respiratory cells and ciliated epithelial cells causes increased mucus secretion, cell death, lymphocytic infiltration and submucosal oedema
Mucus and oedema causes narrowed small airways and V/Q mismatch - leading to hypoxia
What are some risk factors for bronchiolitis? (9)
Un/under developed lungs + immune system most common:
1) Premature birth
2) Chronic lung disease eg CF or bronchopulmonary dysplasia
3) Congenital heart disease
4) Neurological disease with hypotonia and pharyngeal disco ordination
5) Immunocompromise
6) Tobacco smoke exposure
7) Non-breast fed
8) Contact with multiple children eg nursery, older siblings
9) Down’s syndrome
How may bronchiolitis present?
<2yr with 1-3 day hx of coryzal symptoms followed by:
1) Persistent cough AND
2) Either tachypnoea or chest recession (or both); AND
3) Either wheeze or crackles (or both)
Other features include low grade fever (under 39 degrees Celsius) and poor feeding
What are some other signs of hypoxia / increased work of breathing?
1) Tracheal tug
2) Cyanosis
3) Tachypnoea
4) Sub-costal recession
5) Nasal flare
What features may make you consider a pneumonia over bronchiolitis?
Higher temperature and focal crackles
Describe features of bronchiolitis vs viral induced wheeze
Bronchiolitis:
- Younger = 2-12mnths
- Hx of a viral illness followed by a wheeze
- Salbutamol ineffective (too young)
- Treated symptomatically
- Chest sounds of wheeze and crackles
Viral wheeze:
- Older = 1-3yrs
- Shorter hx, wheeze develops in hours-day
- Salbutamol effective
- Chest sounds clear cut wheeze
- Treated same as asthma
NB said that asthma cannot be accurately diagnosed before age 5 (but viral wheeze treated as asthma)
What features may make you consider a viral induced wheeze over bronchiolitis?
Wheeze with no crackles, episodic symptoms and/or a FH of atopy
How may young infants present with bronchiolitis?
May be lone apnoea
What investigations are performed for bronchiolitis? (4)
1) Full examination inc CRT, RR, HR, chest signs
2) Pulse oximetry - hypoxia
3) Nasopharyngeal swab fluorescent antibody test - RSV +ve
4) CXR - non specific: maybe hyperinflation, atelectasis, consolidation
What features require immediate referral to secondary care for bronchiolitis? (5)
1) Apnoea (observed or reported)
2) Marked chest recession or grunting
3) RR >70
4) Central cyanosis
5) O2 sats <92%
Or clinical judgement that the child looks severely unwell
What treatment is given for moderate acute bronchiolitis?
Usually mild, self-limiting illness that can be managed at home
Supportive treatment focussing on fluid input, nutrition and temperature control
Advise parents that symptoms peak between 2-5 days of onset
If awaiting referral to hospital, give supplementary oxygen if sats are persistently <92%
What treatment is given for severe bronchiolitis?
Admission in severe cases, symptomatic treatment:
1) Oxygen - achieve >92%
2) CPAP / intubation and ventilation
3) Fluids - limit oral needs, use NG tube or IV depending on severity (may need intermittent feeding as may vomit)
NB salbutamol ineffective = too young to have adrengergic receptors
What prophylactic treatment can be given for bronchiolitis?
Palivizumab = monoclonal antibody to RSV can be given to high risk groups my monthly IM injection
ie those with bronchopulmonary dysplasia due to premature birth, congenital heart disease or immunodeficiencies
What is croup also known as?
Acute laryngotracheitis
Acute laryngotracheobronchitis
Which ages are mostly affected by croup?
Typically 6 months - 6 years
Peak incidence at 2 years
What is the aetiology of croup?
Most commonly: Parainfluenza viruses types I, II, III and IV (approx 80%)
What is the pathophysiology of croup?
Viral URTI causes nasopharyngeal inflammation that may spread to the larynx and trachea, causing sub glottal inflammation, oedema and compromise of the airway at is narrowest portion
Movement of vocal chord impaired = characteristic cough
How may croup present?
Initially nonspecific symptoms of viral URTI eg coryzal symptoms, fever, cough (12-72hrs)
This progresses to characteristic seal barking cough and hoarse cry (worse at night)
+/- stridor
Decreased chest sounds if severe airflow limitation
+/- respiratory distress - tachypnoea, intercostal recession etc
What is the natural course of croup?
3-7 days but can persist for up to 2 weeks
Usually mild and self limiting, but the distressing symptoms can mean parents present to GP/A&E
Severe cases can compromise upper airway
What is the scoring system for the severity of croup?
Westley scoring system
What features to the Westley scoring system involve?
1) Inspiratory stridor
Not present = 0
When agitated/active = 1
At rest = 2
2) Intercostal recession Not present = 0 Mild = 1 Miderate = 2 Severe = 3
3) Air entry
Normal = 0
Mildly decreased = 1
Severely decreased = 2
4) Cyanosis
None = 0
When agitated/active = 4
At rest = 5
5) Level of consciousness
Normal = 0
Altered = 5
Scoring / 17
0-3 = mild
4-6 = moderate
>6 = severe