Pulmonology

Question 1

Hi there 🫵🏼 سمِّي الله

Answer 1

بسم الله الرّحمن الرَّحيم 💡

Question 2

🫁 What are the key components of initial treatment in a child with acute asthma exacerbation?

Answer 2

🚩 Initial management includes:
➡️ Supplemental oxygen
➡️ Inhaled β-agonist (e.g. albuterol) every 20 minutes for 1 hour
➡️ If no response: add inhaled ipratropium
➡️ If severe: give systemic corticosteroids

Question 3

What

is the first-line maintenance treatment for newly diagnosed persistent asthma in childrenC s

Answer 3

✅ Daily inhaled corticosteroids (ICS)

Question 4

🧠 What is the role of epinephrine in acute asthma exacerbation?

Answer 4

➡️ Used IM in severe or unresponsive cases
✅ Acts as a potent bronchodilator when inhaled β-agonists + steroids are insufficient

Question 5

🧪 What monitoring is essential during treatment of acute asthma exacerbation in children?

Answer 5

✅ Oxygen saturation
✅ Work of breathing / clinical signs
✅ Hydration status
✅ Response to bronchodilators

Question 6

Why is a chest X-ray not routinely indicated in an acute asthma exacerbation?

Answer 6

Chest X-ray is not routinely needed unless there is suspicion of pneumonia, foreign body aspiration, pneumothorax, or atypical presentation.

Question 7

What is the first line maintenance treatment for newly diagnosed persistent asthma in children under? :

Answer 7

✅ Daily inhaled corticosteroids (ICS)

Question 8

When are short-acting β2 agonists (SABA) used in asthma treatment?

Answer 8

👉🏼 Used as-needed for intermittent asthma or as reliever medication in persistent asthma.

Question 9

Why are long-acting β2 agonists (LABAs) not used alone as first-line treatment for persistent asthma?

Answer 9

⛔ LABAs do not treat inflammation.
They are only used in combination with ICS, never alone, to avoid increased risk of asthma-related death.

Question 10

Why are oral corticosteroids not used as first-line treatment in persistent asthma?

Answer 10

⛔ Systemic steroids are reserved for acute exacerbations or severe uncontrolled asthma due to side effects.

Question 11

What are major risk factors for persistent asthma in children?

Answer 11

🚩 Allergies (eczema, food allergies, allergic rhinitis)
🚩 Parental asthma
🚩 Wheezing apart from colds
🚩 Inhalant/food allergen sensitization
🚩 Male gender, formula feeding, low birthweight
🚩 Environmental tobacco smoke

Question 12

What are the goals of long-term asthma management in children?

Answer 12

✅ Control symptoms
✅ Maintain normal activity and lung function
✅ Prevent exacerbations and minimize airway remodeling

Question 13

What causes the recurrent respiratory infections in primary ciliary dyskinesia (PCD)?

Answer 13

🚩 Defective ciliary motility

Question 14

________ is a reproductive complication typically seen in males with primary ciliary dyskinesia (PCD), and ________ is the most common nasal symptom

Answer 14

✅ Male infertility

✅ Chronic mucopurulent nasal drainage

Question 15

How does dextrocardia fit into the diagnosis of primary ciliary dyskinesia?

Answer 15

🧠💡Dextrocardia (right-sided heart sounds) may be a clue for situs inversus, which occurs in ~50% of PCD patients (Kartagener syndrome: PCD + situs inversus)

Question 16

In a child with chronic sinopulmonary infections, when is pancreatitis a clue to the diagnosis?

Answer 16

✅ When pancreatic insufficiency or pancreatitis is present along with recurrent respiratory infections, suspect Cystic Fibrosis
##footnote
💡 Clue: Positive sweat chloride test, failure to thrive, greasy stools.

Question 17

How do you differentiate between PCD and cystic fibrosis in a child with chronic respiratory issues?

Answer 17

🔷 PCD: Situs inversus, normal pancreas, chronic nasal congestion, male infertility
🔷 CF: Pancreatic insufficiency, meconium ileus, digital clubbing, salty-tasting skin, infertility due to vas deferens absence
✅ Sweat chloride test ➕ for CF
✅ Nasal nitric oxide low in PCD

Question 18

What is the underlying genetic defect in cystic fibrosis, and how does it affect diagnosis?

Answer 18

✅ mutations in the CFTR gene
✅ Diagnosis:
☑️ Sweat chloride >60 mEq/L PLUS one or more of:
• 2 pathogenic CFTR mutations
• Typical pulmonary symptoms (e.g. chronic cough, bronchiectasis)
• Pancreatic insufficiency
• Positive family history

Question 19

What are common early clinical signs of cystic fibrosis in infants and young children?

Answer 19

✅ Recurrent respiratory infections
✅ Meconium ileus
✅ Pancreatic insufficiency
✅ Failure to thrive
✅ Dehydration with hyponatremic, hypochloremic metabolic alkalosis

Question 20

What spirometry pattern is expected in a patient with cystic fibrosis?

Answer 20

✅ Obstructive pattern — due to mucus plugging and airway inflammation

Question 21

Why is conductive hearing loss not associated with cystic fibrosis?

Answer 21

⛔ Conductive hearing loss is unrelated to CF — CF primarily affects respiratory, GI, and endocrine systems

Question 22

What are the diagnostic criteria for confirming cystic fibrosis in a child?

Question 23

What diagnosis is suggested by nighttime hypercarbia with daytime normocarbia and severe constipation in an infant?

Answer 23

✅ Congenital Central Hypoventilation Syndrome (CCHS) with likely Hirschsprung disease

Question 24

What genetic mutation is commonly associated with congenital central hypoventilation syndrome (CCHS)?

Answer 24

✅ PHOX2B gene mutation

Question 25

In an infant with suspected CCHS and constipation ________ is necessary to confirms nocturnal hypoventilation without distress, and _________ is to __________

Answer 25

✅ Sleep study ✅ rectal biopsy, checks for aganglionosis (Hirschsprung)

Question 26

What is the hallmark clinical presentation of spasmodic (viral) croup in a child aged 3 months to 5 years?

Answer 26

✅ Barking cough + hoarseness + inspiratory stridor (usually preceded by mild URI symptoms)

Question 27

What is the most appropriate treatment for a child with moderate to severe croup?

Answer 27

✅ Nebulized racemic epinephrine + corticosteroids (e.g., dexamethasone)

Question 28

What radiologic sign is sometimes seen in croup, and what does it represent?

Answer 28

✅ Steeple sign on neck X-ray

Question 29

Why are antibiotics not routinely indicated in croup?

Answer 29

❌ Croup is viral in origin (parainfluenza most commonly) ✅ Antibiotics are only considered if secondary bacterial superinfection is suspected

Question 30

What are the key differences between croup and epiglottitis?

Answer 30

🆚 Croup: gradual onset, barking cough, hoarseness, stridor 🆚 Epiglottitis: sudden high fever, toxic appearance, drooling, muffled voice, tripod position, no barking cough ➡️ Epiglottitis is a medical emergency

Question 31

How is adenoidal hypertrophy usually recognized, and how does it differ from croup?

Answer 31

👃 Adenoidal hypertrophy: chronic snoring, nasal obstruction, mouth breathing ⛔ No barking cough or stridor like in croup.

Question 32

Why are bronchodilators like Ventolin and ipratropium not helpful in croup?

Answer 32

❌ Albuterol and ipratropium treat lower airway diseases (e.g. asthma, bronchiolitis) ⛔ Croup is an upper airway obstruction (subglottic edema), not bronchospasm .

Question 33

What sign indicates impending airway obstruction in croup, and what should be done?

Answer 33

🚨 Hypoxia, severe stridor at rest, or altered mental status = airway emergency.

Question 34

What is spasmodic croup, and how does it differ from typical viral croup?

Answer 34

✅ Spasmodic croup presents with sudden nighttime onset of stridor and barking cough, usually without fever or viral prodrome 🧠 Etiology may be allergic; recurrent but self-limited episodes

Question 35

What is the first-line treatment for spasmodic croup?

Answer 35

✅ Oral corticosteroids (e.g., dexamethasone) ➡️ Reduce laryngeal edema, shorten symptom duration, and prevent hospitalization

Question 36

What is Sudden Infant Death Syndrome (SIDS) and when does it most commonly occur?

Answer 36

SIDS is the **sudden, unexplained death of an infant under 1 year of age** , most commonly between **1–4 months** , and is the **leading cause of death after the neonatal period.**

Question 37

What are the major modifiable risk factors for SIDS?

Answer 37

🚨 Smoking (prenatal & postnatal) 🚨 Bed-sharing 🚨 Soft sleep surface or bedding 🚨 Prone or side sleeping 🚨 Overheating 🚨 Lack of breastfeeding 🚨 No pacifier use 🚨 Poor prenatal care 🚨 Unvaccinated infant

Question 38

What protective factors are known to reduce the risk of SIDS?

Answer 38

✅ Supine sleeping position ✅ Firm sleep surface ✅ Pacifier use during sleep ✅ Room-sharing without bed-sharing ✅ Breastfeeding ✅ Vaccination ✅ Avoid overheating and soft bedding

Question 39

Why is pacifier use during sleep recommended to reduce the risk of SIDS?

Answer 39

🧠 Pacifier use may help maintain airway patency and reduce arousability threshold

Question 40

How does breastfeeding affect SIDS risk?

Answer 40

✅ Breastfeeding is protective — it lowers infection risk, improves autonomic regulation, and reduces SIDS incidence

Question 41

Which sleeping position is associated with the highest risk of SIDS?

Answer 41

⛔ Prone (stomach) sleeping is the most dangerous

Question 42

What is the second most common viral cause of bronchiolitis in young children after RSV?

Answer 42

✅ Human metapneumovirus (HMPV)

Question 43

What distinguishes HMPV from other pathogens like Mycoplasma pneumoniae or Bordetella pertussis?

Answer 43

👉🏼 HMPV is a viral cause of bronchiolitis and pneumonia in young children, 🔹 Mycoplasma pneumoniae causes atypical pneumonia in older children/adolescents. 🔹 Bordetella pertussis causes whooping cough, not bronchiolitis.

Question 44

Which virus causes roseola (sixth disease) and is not associated with bronchiolitis?

Answer 44

⛔ Human herpesvirus 6 (HHV-6)

Question 45

What is the most common cause of congenital stridor in infants and children?

Answer 45

✅ Laryngomalacia

Question 46

What is the usual management approach for infants diagnosed with laryngomalacia?

Answer 46

🔷 Expectant observation, as most cases resolve spontaneously with airway growth.

Question 47

When do symptoms of laryngomalacia typically appear and peak in severity?

Answer 47

🍼 Symptoms usually begin within the **first 2 weeks** of life and worsen up to **6 months of age** .

Question 48

What is the most appropriate test to confirm laryngomalacia in a thriving infant with inspiratory stridor?

Answer 48

✅ Flexible laryngoscopy ➡️ Shows epiglottic collapse into the airway during inspiration.

Question 49

When should you suspect an alternative diagnosis to laryngomalacia in an infant with stridor?

Answer 49

When any of the following are present: ❗ Failure to thrive ❗ Cyanotic episodes ❗ Feeding difficulties or regurgitation ❗ Dysmorphic features (suggest genetic syndromes)

Question 50

What common gastrointestinal condition is associated with laryngomalacia?

Answer 50

🤢 Laryngopharyngeal reflux

Question 51

What clinical findings suggest laryngomalacia in an infant with stridor?

Answer 51

✅ Inspiratory, low-pitched stridor that began within the first 1–2 weeks of life and worsens with crying, agitation, or feeding. No food regurgitation is mentioned.

Question 52

Why are bronchodilators not indicated in infants with laryngomalacia?

Answer 52

⛔ Bronchodilators are used for asthma or lower airway obstruction, not for the upper airway collapse seen in laryngomalacia.

Question 53

What causes the stridor in laryngomalacia?

Answer 53

⚠️ Stridor is caused by supraglottic collapse during inspiration due to decreased laryngeal tone.

Question 54

What is the most common congenital chest wall abnormality in children?

Answer 54

✅ Pectus excavatum

Question 55

What are the main syndromic associations of pectus excavatum?

Answer 55

✅ Marfan syndrome and Ehlers-Danlos syndrome

Question 56

What are possible secondary causes of pectus excavatum?

Answer 56

🟰 Chronic lung disease, neuromuscular disease, and chest trauma.

Question 57

Why is Down syndrome not associated with pectus excavatum?

Answer 57

⛔ It is more associated with atlantoaxial instability, hypotonia, and cardiac defects, not chest wall deformities.

Question 58

What are hallmark features of Prader-Willi syndrome, ruling it out in a case of pectus excavatum?

Answer 58

❌ Obesity, hypotonia, hyperphagia, and developmental delay

Question 59

What feature distinguishes Williams syndrome and makes it unrelated to pectus excavatum?

Answer 59

🎭 “Elfin” facial features + supravalvular aortic stenosis + intellectual disability. No chest wall deformity is typical.

Question 60

What is the natural course of transient nonatopic wheezing in infancy?

Answer 60

📉 It usually disappears by preschool years and does not predispose to persistent asthma.

Question 61

What are the 3 major risk factors for persistent asthma later in life in children with recurrent wheezing?

Answer 61

🚩 Parental asthma 🚩 Atopic dermatitis (eczema) 🚩 Inhalational allergen sensitivity

Question 62

What are the minor risk factors for future asthma development in wheezy children?

Answer 62

➕ Allergic rhinitis ➕ Wheezing not related to colds ➕ Food allergen sensitivity ➕ >4% eosinophils ➕ Male gender ➕ Tobacco smoke exposure

Question 63

What is the connection between pancreatitis and wheezing in children?

Answer 63

⛔ None directly — Pancreatitis is associated with Cystic Fibrosis, not transient nonatopic wheezing.

Question 64

is Transient Nonatopic Wheezing, and how does it usually present in children?

Answer 64

✅ A form of wheezing seen in young infants, typically after viral respiratory infections. ➡️ Resolves by preschool age ➡️ No increased risk of asthma later in life.

Question 65

What are the classic symptoms of croup, and how do they typically progress?

Question 66

What is the most likely cause of recurrent pneumonia in the same lung location in a child?

Answer 66

✅ Pulmonary sequestration

Question 67

What are the clinical findings suggestive of pulmonary sequestration on physical exam?

Answer 67

🔹 Dullness to percussion 🔹 ↓ breath sounds 🔹 Possible crackles during infection 🔹 Continuous or systolic murmur over the back

Question 68

What distinguishes pulmonary sequestration from foreign body aspiration in recurrent pneumonia?

Answer 68

✅ Sequestration: same location, systemic blood supply, murmur possible ⛔ FBA: usually right-sided, sudden onset, no murmur

Question 69

How does diaphragmatic eventration differ from sequestration in cause of pneumonia?

Answer 69

🎈 Diaphragmatic eventration = abnormal diaphragm movement causing air trapping and sometimes recurrent infections ✅ May cause respiratory symptoms and recurrent infections but not associated with abnormal vasculature or murmur

Question 70

What imaging modality is best to confirm pulmonary sequestration and delineate its blood supply?

Answer 70

🖼️ Contrast-enhanced CT scan

Question 71

What is the classic triad of Kartagener syndrome, a subset of Primary Ciliary Dyskinesia (PCD)?

Answer 71

✅ Chronic sinusitis, bronchiectasis, and situs inversus totalis 🧠 Seen in ~50% of PCD cases; reflects defective ciliary motility i

Question 72

What four key features should raise suspicion for Primary Ciliary Dyskinesia in a child?

Answer 72

1. Unexplained neonatal respiratory distress in a term infant 2. Situs inversus or other laterality defect 3. Chronic rhinitis beginning before 6 months 4. Daily wet/productive cough starting before 6 months

Question 73

What diagnostic test confirms Primary Ciliary Dyskinesia (PCD)?

Answer 73

✅ Ciliary ultrastructure assessment via nasal mucosa curettage or bronchial brushing, analyzed by transmission electron microscopy (TEM)

Question 74

When should serum immunoglobulin levels be checked in a child with recurrent respiratory infections?

Answer 74

When infections are: 🔸 Severe 🔸 Caused by unusual organisms 🔸 Recurrent without structural abnormality 🔸 Associated with poor vaccine response or family history of immunodeficiency

Question 75

When is bone marrow biopsy indicated in a child with recurrent infections?

Answer 75

📌 If there is cytopenia, unexplained lymphoproliferation, or suspicion for hematologic malignancy or SCID

Question 76

What are the key diagnostic findings of Allergic Bronchopulmonary Aspergillosis (ABPA)?

Answer 76

✅ Difficult-to-treat asthma or cystic fibrosis ✅ ↑ Total IgE ✅ ↑ Aspergillus-specific IgE & IgG ✅ Positive skin test or precipitating antibodies to Aspergillus ✅ Central (proximal) bronchiectasis ✅ Peripheral and pulmonary eosinophilia (on CBC or BAL)

Question 77

In which patient populations should ABPA be suspected?

Answer 77

👉🏼 Patients with asthma (uncontrolled or severe) 👉🏼 Patients with cystic fibrosis showing unexplained deterioration (e.g. ↑ cough, ↑ sputum, ↓ exercise tolerance)

Question 78

What is the first-line treatment for ABPA?

Answer 78

🚩 Systemic corticosteroids (to suppress inflammation) ➕ Itraconazole (antifungal against Aspergillus) ➕ Omalizumab (anti-IgE monoclonal antibody, esp. for steroid-sparing)

Question 79

Why are antibiotics NOT indicated in ABPA?

Answer 79

⛔ ABPA is a hypersensitivity reaction, not an infectious pneumonia ⛔ No signs of infection (fever, ↑ CRP, leukocytosis)

Question 80

What are the typical clinical features of spontaneous pneumothorax in adolescents?

Answer 80

✅ Sudden-onset chest pain and dyspnea ✅ Decreased breath sounds on the affected side ✅ Often occurs in tall, thin, otherwise healthy teenagers ✅ No trauma, fever, or signs of infection

Question 81

What are the radiologic findings of spontaneous pneumothorax on chest X-ray?

Answer 81

👉🏼 Visible pleural line with no lung markings peripheral to it 👉🏼 Commonly seen at the apex

Question 82

What is the management of a small primary spontaneous pneumothorax in a stable adolescent?

Answer 82

✅ 100% oxygen + observation ➡️ Oxygen accelerates pleural air reabsorption ✅ Most resolve spontaneously in ≤7 days

Question 83

What are the indications for emergency needle decompression in pneumothorax?

Answer 83

🚨 Signs of tension pneumothorax: • Hypotension • Hypoxia • Absent breath sounds • Tracheal deviation away from affected side • Distended neck veins

Question 84

What are the most common causes of transudative pleural effusions?

Answer 84

✅ Cardiac (e.g. heart failure) ✅ Renal (e.g. nephrotic syndrome) ✅ Hepatic (e.g. cirrhosis)

Question 85

What Light’s criteria indicate an exudative pleural effusion?

Answer 85

🚩 Any 1 of the following confirms exudate: ➡️ Pleural/serum protein ratio > 0.5 ➡️ Pleural/serum LDH ratio > 0.6 ➡️ Pleural LDH > 200 IU/L

Question 86

What are the pleural fluid characteristics of a transudate?

Answer 86

✅ Appearance: Serous ✅ WBC count: <10,000 ✅ pH: >7.2 ✅ Protein: <3 g/dL ✅ LDH: <200 IU/L ✅ Glucose: >60 mg/dL ✅ Protein/serum ratio: <0.5 ✅ LDH/serum ratio: <0.6

Question 87

What are typical pleural fluid features of an exudate?

Answer 87

✅ Appearance: Cloudy ✅ WBC count: >50,000 ✅ pH: <7.2 ✅ Protein: >3 g/dL ✅ LDH: >200 IU/L ✅ Glucose: <60 mg/dL

Question 88

What defines empyema on pleural fluid analysis?

Answer 88

🚨 Positive Gram stain 🚨 pH <7.2 🚨 Neutrophils >100,000/μL

Question 89

What is the most common bacterial cause of community-acquired pneumonia in infants aged 3 weeks to 4 years?

Answer 89

✅ Streptococcus pneumoniae

Question 90

What is the first-line outpatient treatment for mild bacterial pneumonia in infants?

Answer 90

✅ Amoxicillin

Question 91

What are the major indications for hospitalization in infants with community-acquired pneumonia?

Answer 91

🚩 Age <6 months 🚩 Immunocompromised state 🚩 Toxic appearance 🚩 Moderate/severe respiratory distress 🚩 Shock (tachycardia, hypotension, poor cap refill) 🚩 Hypoxemia (O₂ sat <90% in room air) 🚩 Complicated pneumonia (e.g. effusion, empyema, abscess) 🚩 Sickle cell + acute chest syndrome 🚩 Vomiting, inability to tolerate PO meds 🚩 Severe dehydration 🚩 No improvement after 48–72h of oral antibiotics 🚩 Social factors (e.g. poor follow-up) 🚩 Infection with a high-risk pathogen

Question 92

Is hospitalization indicated for a 9-month-old with mild pneumonia and no hypoxia?

Answer 92

❌ No 🧠 Age <6 months is a criterion. This infant is older, with O₂ sat 94% ➤ can be managed outpatient unless other criteria present.

Question 93

Is lack of improvement after 24 hours of antibiotics an indication for hospitalization?

Answer 93

❌ No ✅ Hospitalization considered after 48–72 hours without improvement.

Question 94

What is the most common location for a foreign body to become lodged in airway aspiration in children?

Answer 94

One of the main bronchi (80–90% of cases), often the right bronchus due to its anatomy

Question 95

Why is follow-up after symptom resolution NOT appropriate in a child with suspected foreign body aspiration?

Answer 95

Even if symptoms resolve, the risk of silent complications like recurrent pneumonia, airway obstruction, or erosion remains. Urgent bronchoscopy is always indicated when suspicion is high.

Question 96

Why are inhaled corticosteroids (ICS) not the correct management in a child with sudden onset cough after eating and unilateral decreased breath sounds?

Answer 96

ICS are used for asthma control, not for mechanical obstruction like foreign body aspiration. This presentation suggests airway obstruction, not inflammation.

Question 97

Why is salbutamol (albuterol) inappropriate as initial treatment in a stable child with sudden cough and focal decreased breath sounds after eating?

Answer 97

Salbutamol treats bronchospasm, not airway blockage. In foreign body aspiration, mechanical obstruction requires physical removal via bronchoscopy.

Question 98

What imaging is recommended when FBA is suspected in a child?

Answer 98

✅ PA and lateral chest X-rays taken during both inspiratory and expiratory phases

Question 99

What is the key expiratory chest X-ray finding in foreign body aspiration?

Answer 99

✅ Unilateral hyperinflation (air trapping) ✅ Mediastinum shift away from the hyperinflated lung

Question 100

What complication may occur later in untreated foreign body aspiration?

Answer 100

⚠️ Lung collapse (atelectasis)

Question 101

What congenital condition presents in neonates with cyanosis and respiratory distress that improves with crying but worsens with feeding?

Answer 101

✅ Choanal atresia

Question 102

What is the underlying anatomical defect in choanal atresia?

Answer 102

✅ Bony or membranous septum

Question 103

What syndrome is commonly associated with choanal atresia?

Answer 103

✅ CHARGE syndrome: 👉🏼 Coloboma 👉🏼 Heart defects 👉🏼 Atresia of choanae 👉🏼 Retardation of growth/development 👉🏼 Genital anomalies 👉🏼 Ear anomalies

Question 104

How is choanal atresia diagnosed at bedside?

Answer 104

✅ Inability to pass a firm nasal catheter 3–4 cm into the posterior nasopharynx

Question 105

Why does cyanosis improve with crying in choanal atresia?

Answer 105

✅ Mouth opens during crying → bypasses nasal obstruction → improved oxygenation

Question 106

Which two pulmonary pathologies respond well to supplemental oxygen?

Answer 106

➡️ Uniform alveolar hypoventilation (e.g., central airway obstruction, depressed respiratory drive, neuromuscular disease) → Excellent response ➡️ V/Q mismatch (e.g., asthma, bronchiolitis) → Good response

Question 107

Why doesn’t cyanosis due to congenital heart disease improve with oxygen?

Answer 107

❌ Because of right-to-left shunting → deoxygenated blood bypasses lungs → no response to supplemental oxygen

Question 108

What causes methemoglobinemia and why doesn’t it respond to oxygen?

Answer 108

🟰 Increased methemoglobin binds O₂ but doesn’t release it to tissues → tissue hypoxia

Question 109

What is the expected oxygen response in neonatal asphyxia?

Answer 109

⚠️ Poor response; tissue injury already occurred

Question 110

In which liver-related syndrome might cyanosis not respond to supplemental oxygen, and why?

Answer 110

⚠️ Hepatopulmonary syndrome ➡️ Causes intrapulmonary right-to-left shunting → ⛔ No full response to oxygen

Question 111

🧠 What is the purpose of the McIsaac (modified Centor) score?

Answer 111

To estimate the likelihood of Group A Streptococcal (GAS) pharyngitis and guide decisions on testing or treatment in children and adults.

Question 112

✅ What are the 5 components of the McIsaac score?

Answer 112

1. Fever >38°C (100.4°F) 2. Absence of cough 3. Tender anterior cervical lymphadenopathy 4. Tonsillar swelling or exudates 5. Age 3–14 years ➕1 point; age ≥45 ➖1 point ✅ Total score = 0 to 5 (or -1 if ≥45 yrs)

Question 113

Why is neck ultrasound not appropriate in a child with cervical lymphadenopathy during pharyngitis?

Answer 113

⛔ Because lymphadenopathy is likely reactive to the throat infection ✅ 🧠 Ultrasound is only needed if lymph nodes persist, enlarge, or show unusual features. ##footnote 💡 Mnemonic to remember the 4 main criteria (excluding age): 👉🏼 “FATE”: • Fever • Adenopathy (anterior cervical) • Tonsillar exudate • Exclude cough (absence)

Question 114

What are the 3 possible McIsaac score ranges for pharyngitis, and the recommended action for each?

Answer 114

🚩 McIsaac score interpretation: • ✅ 0–1 points → Low risk → No test or antibiotics • ✅ 2–3 points → Intermediate risk → Do a rapid strep test • ✅ ≥4 points → High risk → Empiric antibiotics OR confirm with test

Question 115

💡 Why is the absence of cough considered in the Centor/McIsaac score?

Answer 115

Because absence of cough favors GAS pharyngitis ✅, while presence of cough suggests a viral cause ⛔.

Question 116

✅ What are the most common chest X-ray findings in a child with asthma?

Answer 116

Chest X-rays in asthma are often normal but may show nonspecific findings such as hyperinflation (flattened diaphragms) and peribronchial thickening.

Question 117

✅ What are the expected physical exam findings in a child with an extrathoracic airway obstruction (e.g., laryngeal foreign body)?

Answer 117

Prolonged inspirium with inspiratory stridor, due to obstruction above the mid-trachea (extrathoracic).

Question 118

Why is wheezing not expected in extrathoracic obstruction?

Answer 118

Wheezing originates from intrathoracic small airway obstruction (e.g., bronchioles), typical of asthma or bronchiolitis.

Question 119

Why is prolonged expiration not seen in extrathoracic obstructions?

Answer 119

Prolonged expiration is due to intrathoracic obstruction (below mid-trachea), not extrathoracic ones.

Question 120

Why are rhonchi not heard in extrathoracic obstructions like laryngeal FB?

Answer 120

Rhonchi are low-pitched expiratory sounds from large intrathoracic airways, not from upper airway/laryngeal level.

Question 121

What are the classic symptoms of allergic rhinitis in children?

Answer 121

Intermittent nasal congestion, sneezing, nasal itching, clear rhinorrhea, and conjunctival irritation. ➕ Symptoms worsen with allergen exposure.

Question 122

What are possible complications of nasal congestion in allergic rhinitis?

Answer 122

➡️ Mouth breathing ➡️ Snoring ➡️ Sleep disturbance ➡️ Irritability ➡️ Possible loss of smell/taste

Question 123

What key clinical feature helps distinguish viral rhinitis from allergic rhinitis in children?

Answer 123

Viral rhinitis typically causes thick, purulent nasal discharge and resolves within 7–10 days, whereas allergic rhinitis causes clear, watery discharge with itching and sneezing that is intermittent or seasonal.

Question 124

Why is acute bacterial sinusitis not the most likely diagnosis in a child with chronic clear rhinorrhea and sneezing?

Answer 124

Acute bacterial sinusitis usually presents with persistent purulent nasal discharge, facial pain/pressure, and systemic signs (fever), none of which are typical of allergic rhinitis.

Question 125

Can a nasal foreign body cause bilateral clear rhinorrhea and nasal itching in a child?

Answer 125

No. A nasal foreign body typically causes unilateral, foul-smelling or bloody discharge and is not associated with itching or sneezing.

Question 126

How does vasomotor rhinitis differ from allergic rhinitis in clinical presentation?

Answer 126

Vasomotor rhinitis is non-allergic and triggered by irritants like cold air or perfume, lacks sneezing, itching, and eye symptoms — which are hallmark signs of allergic rhinitis.

Question 127

What is the most likely diagnosis in a child with behavioral problems, daytime sleepiness, and nighttime snoring or apneic episodes?

Answer 127

Obstructive Sleep Apnea (OSA)

Question 128

__________ is the most common cause of OSA in children, which need ________ as first-line treatment, and __________ if it fails to resolve OSA symptoms

Answer 128

Adenotonsillar hypertrophy Adenotonsillectomy Initiate CPAP or BiPAP therapy

Question 129

What is thyroid acropachy and its relevance to digital clubbing?

Answer 129

Thyroid acropachy is a rare complication of autoimmune hyperthyroidism (Graves disease) that causes clubbing, soft tissue swelling, and periosteal reaction.

Question 130

What are the main systems involved in non-pulmonary causes of digital clubbing?

Answer 130

Cardiac (e.g., cyanotic congenital heart disease), gastrointestinal (e.g., IBD, celiac), hematologic (e.g., thalassemia), endocrine (e.g., thyroid acropachy), and others (e.g., liver cirrhosis, lymphoma).

Question 131

إلى هُنا تنتهي رحلتنا مع هذا الشابتر 😌

Answer 131

والسّلامُ عليكم ورحمة الله وبركاته 💡