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Thermal problems in plethysmography and pressure/volume recording

L Vanggaard, J Ostergaard

Aviation, Space, and Environmental Medicine

|April 1, 1977

Summary

Modern pressure transducers can detect heat of compression during volume changes, causing calibration curve errors. Adding a heat sink, like copper mesh, in plethysmographs can reduce these measurement artifacts for accurate volume pulse analysis.

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Area of Science:

Biomedical Engineering
Physiological Measurement

Background:

Modern pressure transducers can detect rapid pressure changes.
Heat of compression can cause overshoot or hysteresis in calibration curves during volume changes.
This phenomenon is particularly relevant when evaluating rapid volume changes, such as in volume pulse recordings.

Purpose of the Study:

To investigate the impact of heat of compression on pressure transducer readings.
To evaluate methods for mitigating measurement artifacts in plethysmography.
To improve the accuracy of volume change measurements, especially during rapid physiological events.

Main Methods:

Utilizing fast-responding pressure transducers to record pressure changes concomitant with volume changes.
Introducing a heat sink (e.g., copper mesh) within the plethysmograph's air space.
Analyzing calibration curves to observe overshoot and hysteresis phenomena.

Main Results:

Fast-responding transducers may record heat of compression artifacts.
A heat sink effectively absorbs heat, diminishing overshoot phenomena in calibration curves.
The effect is less significant in classical venous occlusion plethysmography but crucial for volume pulse analysis.

Conclusions:

Heat of compression is a relevant artifact in plethysmography using modern transducers for rapid volume change assessment.
Implementing heat sinks can reduce these artifacts, enhancing measurement accuracy.
Careful consideration of thermal effects is necessary for precise physiological volume measurements.

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