Which of the following is NOT a characteristic of abnormal plethysmography waveform?

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Multiple Choice

Which of the following is NOT a characteristic of abnormal plethysmography waveform?

Explanation:
The key idea is how plethysmography waveform shape reflects arterial inflow and downstream resistance. In a normal waveform, the rise is rapid (fast upstroke), the peak is sharp, and the downslope returns quickly to baseline. Abnormal waveforms, however, show a slower rise, a rounded or blunt peak, and a downslope that bows away from the baseline due to dampened and delayed runoff. So a fast upstroke is not a feature of abnormal plethysmography; it indicates a normal waveform. The features that do characterize abnormal waveforms are a slow upstroke, a rounded peak, and a downslope that bows away from baseline.

The key idea is how plethysmography waveform shape reflects arterial inflow and downstream resistance. In a normal waveform, the rise is rapid (fast upstroke), the peak is sharp, and the downslope returns quickly to baseline. Abnormal waveforms, however, show a slower rise, a rounded or blunt peak, and a downslope that bows away from the baseline due to dampened and delayed runoff. So a fast upstroke is not a feature of abnormal plethysmography; it indicates a normal waveform. The features that do characterize abnormal waveforms are a slow upstroke, a rounded peak, and a downslope that bows away from baseline.

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