The pulse oximeter is particularly useful for monitoring which scenario?

• A. Monitoring hydration in gastroenteritis
• B. Monitoring a healthy athlete during exertion
• C. Identifying deterioration of a cardiac patient
• D. Detecting fever trends in inpatients

Answer: (C)

Pulse oximetry provides continuous, noninvasive reads of arterial oxygen saturation (SpO2) and pulse rate, making it especially effective for signaling when oxygen delivery to tissues is falling. In cardiac patients, deterioration from conditions like heart failure, pulmonary edema, or ischemia can quickly lead to hypoxemia or compromised perfusion, so a falling SpO2 or abnormal heart rate alerts clinicians to escalate care early. Hydration status, fever trends, and performance in a healthy athlete aren’t primarily measured by oxygen saturation values, so they’re less the focus for what oximetry is best used to monitor.