The changes in pulse transit time (PTT) during the continuous slow deflation of brachial cuff were early reported; however, the PTTs obtained for specific cuff pressures during inflation or deflation have not been compared before. Therefore, the objective of this study is to examine the differences in PTT when cuff pressure (P{sub}(cuff)) was raised or deflated to the desired level. Sixteen subjects participated in this study and according to their systolic blood pressure (SBP) and diastolic blood pressure (DBP), 8 levels of P{sub}(cuff) were predetermined for them individually. P{sub}(cuff) was directly raised to each predetermined level while 20 seconds of electrocardiographic and photoplethysmographic signals were recorded for the calculation of PTT. Another set of recordings were taken when P{sub}(cuff) was raised above the SBP and deflated to the predetermined levels. The results of this study showed that PTT increase significantly when P{sub}(cuff) was larger than 80% of DBP, regardless of whether P{sub}(cuff) was reached by inflation or deflation. Overall, no significant difference was found between PTT obtained during inflation and deflation for 12 out of the 16 subjects. To conclude, changes in PTT are mainly induced by the level of cuff pressure when there is no prolonged period of artery occlusion.
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机译：肱压脉袋的连续缓慢放气期间在脉搏传导时间（PTT）的变化早期报道;然而，充气或放气期间特定袖带压所获得的的PTT以前没有进行比较。因此，本研究的目的是当袖带压力（P {子}（袖带））升高或放气至所期望的水平，以研究在PTT的差异。十六受试者参加了这项研究，并根据他们的收缩压（SBP）和舒张血压（DBP），8平P {子}（袖带）的被预定为它们单独。 p {子}（袖带）直接升高至每个预定的水平，同时20秒心电图和光体积描记信号的记录用于PTT的计算。当P {子}（袖带）引发的SBP以上和放气至预定水平的另一组记录的拍摄。这项研究的结果表明，PTT显著，增加当P {子}（袖带）为DBP的大于80％，无论p {子}（袖带）是否被充气或放气达到。总体而言，没有显著发现差异之间PTT膨胀和排气期间为12出16名受试者的获得。最后，在PTT变化主要诱导当没有延长动脉阻塞期间袖带压力的水平。
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