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Figure 1. A portion of a polysomnogram recorded in a neonate with congenital hydrocephalus and resultant periodic breathing shows frequent, short periods of central apnea, as demonstrated by the cessation of oronasal air flow and the absence of a wave form on the tracing for end-tidal partial pressure of carbon dioxide (PCO2), in association with the absence of chest- and abdominal-wall motion (arrows). Inspiration is represented by an upward deflection in the air-flow and chest- and abdominal-wall signals. There is a six-second delay in the recording of end-tidal PCO2. Oronasal air flow was measured with a thermistor.
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