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Pickwickian Syndrome (Obesity Hypoventilation): Diagnosis, Criteria & Treatment

Pickwickian Syndrome (Obesity Hypoventilation Syndrome): Diagnostic Guide

Pickwickian Syndrome = Obesity Hypoventilation Syndrome (OHS). A triad of obesity, daytime hypercapnia (PaCO₂ >45 mmHg), and sleep-disordered breathing in the absence of other causes of hypoventilation.

Diagnostic Criteria (All Required)

  1. Obesity: BMI ≥30 kg/m² (typically ≥40)
  2. Awake hypercapnia: PaCO₂ >45 mmHg on arterial blood gas
  3. Sleep-disordered breathing: Obstructive sleep apnea (AHI >5) or sleep hypoventilation
  4. Exclusion: No neuromuscular, mechanical, or metabolic cause for hypoventilation

Common Symptoms

  • Excessive daytime sleepiness (EDS)
  • Morning headaches
  • Loud snoring, witnessed apneas
  • Dyspnea on exertion
  • Peripheral edema (right heart failure sign)
  • Cognitive impairment, depression

Diagnostic Workup

  • Polysomnography: Confirms OSA, assesses hypoventilation
  • Arterial blood gas (ABG): Documents chronic hypercapnia
  • Echocardiogram: Evaluates pulmonary hypertension, right heart strain
  • Pulmonary function tests: Restrictive pattern from obesity
  • Labs: BMP, thyroid, CBC, BNP

Treatment

  • PAP therapy: CPAP or BiPAP (first-line; corrects hypoventilation)
  • Weight loss: Definitive treatment; bariatric surgery if indicated
  • Oxygen (cautiously): Only with PAP; alone worsens hypercapnia
  • Tracheostomy + ventilation: Severe refractory cases
  • Manage comorbidities: Heart failure, diabetes, hypothyroidism

Early diagnosis and PAP therapy improve survival, quality of life, and reduce hospitalizations.

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