Blood Flow Under Wrist Cuff, in Hand Alters Oscillometric Waveforms During Blood Pressure Measurement

Jílek, J. O.; Fukushima, Teiichiro

doi:10.2345/0899-8205(2007)41[238:bfuwci]2.0.co;2

Cited by 6 publications

(8 citation statements)

References 16 publications

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“…A gradual wrist cuff deflation procedure was divided into four segments (Jilek & Fukushima, 2007). The following section contains description of CPW and PPG amplitude and shape changes and explanation of each phase in terms of vascular unloading and blood flow.…”

Section: Automatic Bp Determination Based On Physiological Principlesmentioning

confidence: 99%

Biomedical Engineering, Trends in Electronics, Communications and Software

Laskovski¹

2011

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Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained in the book.

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Section: Automatic Bp Determination Based On Physiological Principlesmentioning

confidence: 99%

Biomedical Engineering, Trends in Electronics, Communications and Software

Laskovski¹

2011

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“…Changes in R H also alter the PW amplitude envelope, but the main concern of this study is the wrist cuff width. The narrow cuff presents lower R C to blood flow under the cuff and the result is the decreased slope of S2 Fukushima 2007, Jilek andStork 2003). The narrow cuff allows blood flow under the cuff and into the hand earlier than the wider cuff.…”

Section: Introductionmentioning

confidence: 98%

“…Upper-arm monitors are the most prevalent type, but wrist monitors are gaining popularity with home users. The oscillometric method uses pressure pulse waveforms (PWs) evoked in the cuff during gradual cuff deflation (Jilek and Fukushima 2005). The PW amplitudes increase with decreasing cuff pressure until they reach the point of mean arterial pressure (MAP) and then the amplitudes decrease till the end of the procedure.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 shows the graph of a typical PW amplitude envelope. The segments S1, S2 and S3 represent three segments of the cuff deflation procedure (Jilek and Fukushima 2007). S1 is the segment from the beginning of the procedure to the SBP reference point, S2 is the segment from the SBP to the MAP reference point and S3 is the segment from the MAP to the DBP reference point.…”

Section: Introductionmentioning

confidence: 99%

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Cuff width alters the amplitude envelope of wrist cuff pressure pulse waveforms

Jílek¹,

Štork

2010

Physiol. Meas.

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The accuracy of noninvasive blood pressure (BP) measurement with any method is affected by cuff width. Measurement with a too narrow cuff overestimates BP and measurement with a too wide cuff underestimates BP. Automatic wrist cuff BP monitors use permanently attached narrow cuffs with bladders about 6 cm wide. Such narrow cuffs should result in under-cuffing for wrist circumferences larger than 15 cm. The objective of this qualitative study was to show that a narrow wrist cuff results in increased BP values when a cuff pulse amplitude ratio algorithm is used. According to the algorithm used in this study, systolic pressure (SBP) corresponds to the point of 50% of maximal amplitude; for diastolic pressure (DBP) the ratio is 70%. Data were acquired from 12 volunteers in the sitting position. The mean wrist circumference was 18 cm. The acquired cuff pulse data were used to compute SBP, mean pressure (MAP) and DBP. The mean values for a 6 cm cuff were SBP = 144 mmHg, MAP = 104 mmHg and DBP = 88 mmHg. The values for a 10 cm cuff were SBP = 128 mmHg, MAP = 93 mmHg and DBP = 78 mmHg. The reference BP values were SBP = 132 mmHg, MAP = 96 mmHg and DBP = 80 mmHg. All narrow (6 cm) cuff BP values were higher than wide (10 cm) cuff or reference BP values. The results indicate that wider wrist cuffs may be desirable for more accurate and reliable BP measurement with wrist monitors.

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“…Observations of the effects of blood flow under the cuff and in the hand on the CPW amplitude envelope resulted in the following hypothesis: The slope of CPW waveform amplitude envelope at cuff pressures higher than the reference systolic pressure and the slope at cuff pressures between mean pressure and reference diastolic pressure are steeper than the slope between reference systolic pressure and mean pressure. Based on the above observations we conducted a study of 32 volunteers (Jilek & Fukushima, 2007). To test the hypothesis, 3 slopes (S1-S3) on the waveform amplitude envelope were computed and compared.…”

Section: Automatic Bp Determination Based On Physiological Principlesmentioning

confidence: 99%