Presenting History
In children presenting with suspected Cystic Fibrosis, systematically explore the triad of recurrent/chronic suppurative sinopulmonary infections, exocrine pancreatic insufficiency with steatorrhea, and failure to thrive / malnutrition.
- Respiratory Manifestations:
- Cough: Daily, chronic, unremitting, wet suppurative cough productive of thick, tenacious, mucoid or mucopurulent greenish sputum?
- Wheezing & Airway Hyperreactivity: Recurrent episodes of breathlessness, audible wheezing, or chest tightness responsive or refractory to bronchodilators?
- Recurrent Pneumonias: Frequency of doctor-diagnosed lower respiratory tract infections, requirement for hospitalization, intravenous antibiotics, or supplemental oxygen?
- Hemoptysis: Episodes of blood-streaked sputum or frank hemoptysis (bronchial artery erosion)?
- Upper Airway: Chronic purulent nasal discharge, mouth breathing, snoring, or history of nasal polyposis?
- Gastrointestinal & Pancreatic Manifestations:
- Neonatal Meconium Ileus: Delayed passage of meconium beyond 48 hours of life, neonatal intestinal obstruction, or laparotomy for volvulus/atresia?
- Stool Pattern & Steatorrhea: Frequent, bulky, glistening, pale, exceptionally greasy, foul-smelling stools that float and stain diapers/clothes?
- Appetite & Growth: Voracious appetite ("hyperphagia") yet failure to gain weight; prominent wasting of limbs and abdomen?
- Rectal Prolapse: History of painless mucosal extrusion during defecation?
- Distal Intestinal Obstruction Syndrome (DIOS): Recurrent right lower quadrant colicky pain and constipation.
- Salt Loss & Dehydration:
- "Salty taste" when kissed on the forehead by parents?
- Episodes of unexplained heat exhaustion, acute hypochloremic dehydration, or metabolic alkalosis during warm weather.
Negative History (3C 1D Framework)
| Category | Pertinent Negative Question | Rationale / Significance |
|---|---|---|
| Causes | Immune Deficiency: No history of opportunistic infections, recurrent oral candidiasis, deep-seated abscesses, or BCGitis. Foreign Body Aspiration: No sudden choking, gagging, or paroxysmal coughing followed by persistent unilateral wheezing. Gastroesophageal Reflux: No repetitive postprandial vomiting, Sandifer syndrome posturing, or nighttime regurgitation. | Excludes severe combined immunodeficiency, agammaglobulinemia, or CGD. Rules out retained foreign body causing chronic localized bronchiectasis. Differentiates GERD-induced microaspiration pneumonitis. |
| Complaints (Differentiating) | Primary Ciliary Dyskinesia (PCD): No neonatal respiratory distress in term infant, no situs inversus totalis (Kartagener), no persistent otitis media with effusion since birth. Post-Infectious Bronchiectasis: No preceding history of severe measles, adenovirus, or pertussis infection with focal unilateral lung destruction. | Differentiates dynein arm ciliary defect from CFTR chloride channel defect. Differentiates secondary non-CF bronchiectasis. |
| Complications | Pneumothorax: No sudden pleuritic chest pain, acute dyspnea, or tracheal shift. Massive Hemoptysis: No expectoration of $>240\text{ mL}$ blood in 24 hours. Cor Pulmonale / Pulmonary HTN: No loud P2, pedal edema, hepatomegaly with raised JVP. CF-Related Diabetes (CFRD): No sudden polydipsia, polyuria, or weight loss. | Evaluates acute structural pulmonary emergencies in bronchiectasis. Life-threatening bronchial artery hemorrhage. Assesses right ventricular end-stage failure. Assesses endocrine islet cell exhaustion. |
| Differentials | Celiac Disease: Stools bulky, but sweat chloride normal; no recurrent suppurative lung disease or Pseudomonas colonization. Asthma: Pure airway reversibility without persistent bronchorrhea, clubbing, or bronchiectasis on HRCT. | Differentiates enterocyte malabsorption from exocrine pancreatic insufficiency. Rules out isolated allergic bronchial asthma. |
Other Relevant History
- Dietary History: 24-hour recall; assess fat and caloric intake. Check adherence to Pancreatic Enzyme Replacement Therapy (PERT: timing with meals, dosage per gram of fat).
- Developmental History: Assess gross motor and social milestones; check school attendance and stamina.
- Family History & Pedigree: Detailed three-generation pedigree inquiring about sibling deaths in early infancy from meconium ileus, malnutrition, chronic chest infections, or cystic fibrosis (autosomal recessive inheritance).
History Summary
"Master/Miss `Patient Name`, a `Age` old `male/female` child, `Birth Order` born of a `consanguineous/non-consanguineous` marriage from `City, State`, presented with a `Duration in months/years` history of recurrent daily wet suppurative cough, frequent doctor-diagnosed lower respiratory tract infections requiring multiple hospital admissions, persistent malabsorptive bulky greasy stools despite a voracious appetite, severe failure to thrive, and a salty taste on the skin, without history of massive hemoptysis, neonatal meconium ileus, or sudden breathlessness.
In view of the chronic bilateral suppurative lung disease with bronchiectasis combined with exocrine pancreatic insufficiency and failure to thrive, I would like to consider a provisional diagnosis of Cystic Fibrosis (CFTR Channelopathy), currently in an acute pulmonary exacerbation, with severe protein-energy undernutrition, without clinical evidence of pneumothorax or cor pulmonale."
General & Head-to-Toe Examination
- Child Behavioral State & Respiratory Effort: Tachypneic at rest, use of accessory muscles (suprasternal, intercostal retractions), audible rattle/wheeze.
- Vitals & Anthropometry: Pulse rate, respiratory rate, SpO2 on room air, blood pressure. Weight, Height, BMI Z-scores, MUAC.
- General Signs & Stigmata:
- Digital Clubbing: Grade III/IV drumstick clubbing of fingers and toes (Lovibond angle $>180^\circ$, Schamroth sign obliterated).
- Pallor & Cyanosis: Central and peripheral cyanosis, conjunctival pallor.
- Upper Airway Signs: Nasal bridge widening, anterior rhinoscopy showing translucent, glistening nasal polyps.
- Nutritional Stigmata: Loss of temporal and buccal fat pads, prominent ribs, muscle wasting.
Systemic Examination
Respiratory System
- Inspection: Barrel-shaped chest deformity (increased AP diameter), subcostal and intercostal indrawing, Harrison sulcus, tracheal position.
- Palpation: Trachea central, symmetrical chest expansion (may be bilaterally restricted), palpable rhonchial fremitus.
- Percussion: Hyperresonant percussion note throughout lung fields; obliteration of cardiac dullness and depressed hepatic dullness (air trapping).
- Auscultation:
- Breath sounds: Vesicular with prolonged expiration, or bronchial breath sounds over bronchiectatic areas.
- Added sounds: Bilateral coarse pan-inspiratory and expiratory crackles ("leathery" or moist rales) clearing partially after coughing, accompanied by high-pitched expiratory polyphonic wheezes.
- Vocal resonance: Increased over areas of consolidation or dilated bronchiectatic cavities.
Abdomen & Cardiovascular
- Abdomen: Protuberant, soft; palpate for hepatomegaly (steatosis or focal biliary cirrhosis) and splenomegaly (portal hypertension); inspect for fecal impaction in right iliac fossa (DIOS).
- Cardiovascular: Loud pulmonary component of second heart sound ($P_2$), parasternal heave, epigastric pulsation indicating right ventricular hypertrophy (Cor Pulmonale).
Final Summary & Diagnosis
"A `Age` old `male/female` child presenting with chronic suppurative lung disease and exocrine pancreatic malabsorption, with examination confirming tachypnea, severe digital clubbing (Grade III/IV), bilateral coarse crackles and expiratory wheezes, hyperinflated barrel chest, nasal polyposis, and severe wasting, without signs of cor pulmonale or respiratory failure.
My final clinical diagnosis is Cystic Fibrosis presenting with Bilateral Bronchiectasis and Exocrine Pancreatic Insufficiency, currently in an Acute Pulmonary Exacerbation, complicated by severe undernutrition and chronic hypoxemia, pending sweat chloride quantitative pilocarpine iontophoresis and CFTR gene mutation analysis."