Abstract
ObjectiveThe aim of this study was to evaluate the accuracy of a new blood pressure (BP) measurement method (Pulse method).MethodsThis study enrolled 45 patients for selective percutaneous coronary intervention (PCI) via right radial artery. A BP device using either oscillometric (Microlife 3AC1-1) or Pulse method(RG-BP11)was used. At the beginning of each PCI, intra-radial BP was measured before Microlife BP or Pulse BP measurement as its own reference, respectively. At the end of PCI, BP was measured again with the measurement order of Microlife BP and Pulse BP reversed. The differences between intra-radial and Microlife (BPi-M) or Pulse BP (BPi-P) on SBP, DBP and mean artery pressure (MAP) were calculated. Meanwhile, in 48 patients the intra-brachial BP and intra-radial artery BP were measured to calculate the brachial -radial BP difference (BPr-b).ResultsThe intra-radial SBP references used prior to both the Microlife and Pulse SBP that were similar (145.1±27.7 vs 145.8±24.2 mmHg), but the Microlife SBP was significantly lower than the Pulse SBP (127.7±20.5 vs 130.3±22.7 mmHg, P<0.05), thus the SBPi-M was higher than SBPi-P (18.1±11.8 vs 14.8±12.8 mmHg, P<0.05). As the mean SBPr-b was 12.4 mmHg, the Pulse SBP was closer to expected intra-brachial SBP by about 3.3 mmHg than was Microlife SBP to expected intra-brachial SBP. Meanwhile, Bland-Altman plots showed that the 95% limits of agreement for intra-radial SBP by Pulse SBP were narrower than those by Microlife SBP (12.0∼17.5 vs 15.5∼20.6 mmHg). However, the 95% limits of agreement for Pulse DBP and MAP were similar to those for Microlife DBP and MAP.ConclusionAgainst the invasive BP measurement, the pulse method may provide more accurate SBP and comparable DBP and MAP as compared with the oscillometric method.
Highlights
Mercury sphygmomanometers will be replaced by new blood pressure (BP) devices in the near future because of their pollution problems
As 4 patients had no complete paired Pulse and Microlife BP data, only 85 pairs of intra-radial and Microlife BPs and 85 pairs of intra-radial and Pulse BPs were used for analysis
The range (93–206 vs 88–226 mmHg) and the mean value of intraradial SBP taken before Microlife BP were very similar to those taken before Pulse BP
Summary
Mercury sphygmomanometers will be replaced by new blood pressure (BP) devices in the near future because of their pollution problems. Most electronic automatic BP devices use the oscillometric method to determine systolic and diastolic BP (SBP and DBP). A novel automatic BP device (Pulse BP device) was developed and commercialized in China. This device uses a new ‘‘Pulse method’’ to determine SBP and DBP. This new BP device was patented in China and other countries [8,9], its accuracy against invasive catheter BP has not been fully determined. The aim of this study is to compare the accuracy between the Pulse method and the oscillometric method against invasive catheter BP measurement
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