arterial desaturation
Decreased oxygen content in arterial blood, typically measured by pulse oximetry in pediatric cardiac patients.
Full Definition
Arterial desaturation refers to reduced oxygen saturation in arterial blood, commonly seen in patients with right-to-left shunting or inadequate pulmonary blood flow. Normal arterial oxygen saturation is 95-100%, while values below 90% are generally considered significant. In cyanotic congenital heart disease, chronic desaturation may lead to compensatory polycythemia, clubbing, and exercise intolerance. Pulse oximetry provides continuous non-invasive monitoring, though arterial blood gas analysis gives more precise measurements. The degree and duration of desaturation influence timing of surgical interventions and long-term outcomes.
Usage
Usage note: Use specific saturation percentages when available rather than subjective terms like 'mild' or 'severe'.
In Context
- "The patient demonstrated significant arterial desaturation with oxygen saturations consistently below 75%." — consultation note
- "Exercise testing revealed progressive arterial desaturation from 88% to 72% with activity." — exercise study report