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The changes in pulse transit time at specific cuff pressures during inflation and deflation
Yinbo Liu1, Carmen C Y Poon, Y T Zhang
1Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Hong Kong.
Summary
Pulse transit time (PTT) measurements are similar whether cuff pressure is inflated or deflated. PTT changes are primarily driven by cuff pressure levels, not the inflation or deflation process itself.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
Background:
- Pulse transit time (PTT) changes during cuff deflation are known.
- Comparisons of PTT during cuff inflation versus deflation at specific pressures are lacking.
Purpose of the Study:
- To investigate differences in PTT when brachial cuff pressure (P(cuff)) is increased or decreased to predetermined levels.
- To compare PTT measurements obtained during cuff inflation versus deflation.
Main Methods:
- Sixteen subjects had PTT measured at 8 predetermined cuff pressure levels.
- Recordings were taken during direct inflation to target pressures and during deflation from suprasystolic levels.
- Electrocardiographic and photoplethysmographic signals were used for PTT calculation.
Main Results:
- PTT significantly increased when P(cuff) exceeded 80% of diastolic blood pressure (DBP), irrespective of inflation or deflation.
- No significant difference in PTT was observed between inflation and deflation methods for 12 out of 16 subjects.
Conclusions:
- Pulse transit time changes are primarily influenced by the cuff pressure level.
- The method of reaching cuff pressure (inflation vs. deflation) has minimal impact on PTT when artery occlusion is not prolonged.
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