Related Experiment Videos
[Hemodynamics associated with sleep disorders in anesthetized dogs]
1Second Department of Internal Medicine, Hiroshima University School of Medicine, Japan.
Nihon Kyobu Shikkan Gakkai Zasshi
|January 1, 1995
Summary
Researchers discovered that pulse oximeters can measure respiratory rate, intrathoracic pressure, and O2 saturation by analyzing volume pulse wave (VPW) fluctuations during breathing. This finding offers new insights into respiratory monitoring.
Area of Science:
- Physiology
- Medical Devices
Context:
- Pulsus paradoxus, a >10 mmHg systolic pressure fluctuation during respiration, is a known clinical sign.
- Non-invasive monitoring of respiratory parameters is crucial in various medical settings.
Purpose:
- To investigate the relationship between esophageal pressure and fluctuations in systolic pressure and volume pulse wave (VPW) during the respiratory cycle.
- To determine if pulse oximetry can be used to derive respiratory variables beyond O2 saturation.
Summary:
- Strong correlations were found between esophageal pressure amplitude and the degree of fluctuation in both systolic pressure (r=0.992-0.998) and VPW (r=0.985-0.995) in canine models.
- The study demonstrates that VPW fluctuations, recorded via pulse oximeter, correlate with intrathoracic pressure.
- These findings suggest that pulse oximeters can potentially measure respiratory rate, intrathoracic pressure, and O2 saturation.
Impact:
- This research indicates a novel application for pulse oximetry in non-invasively measuring respiratory rate and intrathoracic pressure.
- The findings may have significant implications for clinical studies, particularly in sleep disorder diagnostics and management.
- Enables enhanced respiratory monitoring using a widely available medical device.