What question did this study set out to answer?

To evaluate the detection of pulsus alternans using pulse oximetry in a specific clinical case.

March 2, 2026

Dynamic detection of pulsus alternans using pulse oximetry: rate-dependent and Valsalva-induced changes

Key Result

Dynamic pulse oximetry can detect rate-dependent and Valsalva-induced changes in pulsus alternans, aiding non-invasive cardiac assessment.

Key Points

To evaluate the detection of pulsus alternans using pulse oximetry in a specific clinical case.
Case analysis of a woman in her 90s with atrial tachycardia.
Monitoring vital signs including blood pressure and heart rate.
Assessment of pulsus alternans during Valsalva maneuver.
Patient presented with sudden dyspnoea and evidence of pulsus alternans.
Heart rate recorded at 120 bpm and respiratory rate at 24/min.
Dynamic changes in pulsus alternans observed with alterations in heart rate.

Structured PICO

Population

A woman in her 90s with a history of atrial tachycardia treated with verapamil presenting with sudden onset of dyspnoea.

Intervention

Dynamic detection of pulsus alternans using pulse oximetry (rate-dependent and Valsalva-induced changes)

Pulse oximetry may be utilized for the dynamic detection of pulsus alternans, including rate-dependent and Valsalva-induced changes.

Main Result

Absolute Event Rate: 0% vs 0%

Abstract

A woman in her 90s with a history of atrial tachycardia diagnosed 6 months earlier and treated with verapamil was brought to the emergency department with sudden onset of dyspnoea. On arrival, her blood pressure was 118/70 mm Hg, heart rate 120 bpm, respiratory rate (RR) 24/min and oxygen

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Cite This Study

Nishizawa et al. (Sun,) reported a other. Dynamic pulse oximetry can detect rate-dependent and Valsalva-induced changes in pulsus alternans, aiding non-invasive cardiac assessment.

synapsesocial.com/papers/69a52e04f1e85e5c73bf14bc https://doi.org/https://doi.org/10.1136/bcr-2025-271474