Fig. 1
From: Guidelines for diagnosis and management of congenital central hypoventilation syndrome
Diagnostic algorithm for alveolar hypoventilation. Abbreviations: CCHS, Congenital Central Hypoventilation Syndrome; CRP, cardiorespiratory polygraphy; EMG, electromyogram; Et-CO2, end-tidal CO2; MRI, Magnetic Resonance Imaging; PHOX2B, Paired-like homeobox 2B; PSG, polysomnography; ROHHAD, Rapid-onset obesity with hypoventilation, hypothalamic dysfunction, and autonomic dysregulation; NCV, nerve conduction velocity; Tc-CO2, transcutaneous PCO2