Airway obstruction
Anaphylaxis, angioedema
Aspirated foreign body
Asthma exacerbation
Pneumonia
Pneumothorax
Respiratory distress syndrome
Meconium aspiration syndrome
Bronchiolitis (peds), URI
Pertussis
Bronchopulmonary dysplasia
Croup
Epiglottitis
Bacterial tracheitis
Tracheomalacia
Cystic fibrosis exacerbation
Pulmonary edema
Pulmonary hypertension, cor pulmonale
Inhalation exposure
Rib fractures, Flail chest, pulmonary contusion
Nonaccidental trauma
Congenital heart disease
Vascular ring
Cardiac tamponade
Myocarditis (peds)
Normal neonatal periodic breathing (misinterpreted by caregivers as abnormal)
Brief resolved unexplained event
Anemia
Neonatal abstinence syndrome
Decreased perfusion states
Pediatric shock
Sepsis (peds)
Dehydration (peds)
Metabolic acidosis
Diabetic ketoacidosis (peds)
Inborn errors of metabolism
Salicylate toxicity
CO Poisoning
Diaphragm injury
Renal<unk> 
Electrolyte abnormalities
Fever (Peds)
Pediatric shock
Sepsis (peds)
Dehydration (peds)
Diabetic ketoacidosis (peds)
Inborn errors of metabolism
Salicylate toxicity
Congestive heart failure 
Airway obstruction
Lung transplant complications
Anaphylaxis, angioedema
High-output heart failure
Aspirated foreign body
Cirrhosis
Asthma exacerbation