Arterial oxygen tensions

Normal PaCO2 is usually stated to be 97 mmHg (12.9 kPa) when breathing room air (FiO2 = 0.21) at sea level (atmospheric pressure of 760 mmHg or 101 kPa). It is not unusual for PaO2 to fall as low as 80 mmHg (10.6 kPa) during normal sleep or rise as high as 105 mmHg (14 kPa) during excitement. Hypoxemia is defined as PaO2 below 80 mmHg (10.6 kPa) while breathing room air.

The normal adult range of PaO2 decreases with age; the general guideline for patients in hospital is to subtract 1 mmHg from the minimal 80-mmHg level for every year over 60 years of age (Ceryeri,,et...a/ 1995). This guideline is not applicable to persons over 90 years of age.

Sleep Apnea

Sleep Apnea

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