Respiratory

Hypoventilation

A sustained rise in CO2 during sleep, confirmed on a reliable CO2 channel rather than oximetry.

Educational reference, not a diagnostic tool. A scored event, an elevated index and a clinical diagnosis are different things. Follow your facility’s scoring manual, notification policies and clinical protocols.

Rise of 10 mmHg or more to above 50 mmHg for at least 10 minutes; it need not exceed 55.
CO2 above 55 mmHg held for at least 10 minutes is the alternative pathway.
Oxygen alone cannot establish hypoventilation; confirm reliable CO2 measurement.
This is a minutes-long CO2 trend, not a brief apnea waveform.

Waveforms

Hypoventilation: CO2 rise pathway

reviewed

Respiratory

Synthetic transcutaneous CO2 trend rising from 41 mmHg awake to 53 mmHg during sleep, a 12 mmHg rise held as a 12-minute plateau. — Illustrative teaching waveformAdult sleep example; awake supine baseline at 0-2 minutes.Source: Original synthetic teaching signals. Not patient data. Not a diagnostic tracing.

Hypoventilation: CO2 above 55

reviewed

Respiratory

Synthetic transcutaneous CO2 trend rising from an awake baseline of 44 mmHg to a 12-minute plateau at 57 mmHg, above the 55 mmHg reference line. — Illustrative teaching waveformAdult sleep example; awake supine baseline at 0-2 minutes.Source: Original synthetic teaching signals. Not patient data. Not a diagnostic tracing.