Abstract
Background: Twenty-four-hour finger arterial pressure (FAP) recordings show a negative bias against intrabrachial artery pressure (BAP) and the bias is greater during the night, thereby overestimating the nocturnal blood pressure dip. We have available a methodology with which to reconstruct BAP from FAP by waveform filtering (transfer function) and generalized level (bias) correction that reduces the bias for short-term blood pressure records. Objective: To investigate if this methodology also decreases the extra bias during the night, thereby yielding a better estimate of the nocturnal dip. Methods: Twenty-four-hour FAP and BAP blood pressure recordings were simultaneously obtained in eight healthy normotensive volunteers and 14 patients with hypertension (ages 19-60 years), during standardized scheduled activities. The data were analysed off-line, applying the brachial reconstruction technique (reBAP) consisting of a waveform filter and level correction. Simultaneous beats yielded systolic, diastolic and mean pressures that were averaged per 30 min, per day, per night, per activity, over the 24-h period, and for volunteers and patients separately. Results: Over the full 24 h, FAP systolic, diastolic and mean values for the total group differed from BAP by +1 ± 10, -8 ± 7 and -10 ± 8 mmHg (mean ± SD), respectively. Similarly, reBAPs differed by +1 ± 11, -2 ± 7 and -2 ± 7 mmHg. BAPs dipped by 20 ± 8, 13 ± 6 and 15 ± 6 mmHg, respectively, during the night. These dips were overestimated by +8, +4 and +4 mmHg by FAP, but not by reBAP: -1, +1 and +1 mmHg. The volunteer and the patient groups showed slight differences in results, but these were not statistically significant. Conclusions: The generalized reconstruction technique to obtain near-brachial pressure from non-invasive FAP almost completely removed bias over the full 24-h day-night period and improved tracking of diurnal changes for all three blood pressure values.
| Original language | English |
|---|---|
| Pages (from-to) | 1981-1986 |
| Number of pages | 6 |
| Journal | Journal of Hypertension |
| Volume | 20 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Oct 1 2002 |
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Keywords
- Bias
- Blood pressure
- Brachial
- Day-night
- Dip
- Finger
- Pressure difference
ASJC Scopus subject areas
- Endocrinology
- Internal Medicine
Cite this
Variable day/night bias in 24-h non-invasive finger pressure against intrabrachial artery pressure is removed by waveform filtering and level correction. / Westerhof, Berend E.; Guelen, Ilja; Parati, Gianfranco; Groppelli, Antonella; Van Montfrans, Gert A.; Wieling, Wouter; Wesseling, Karel H.; Bos, Willem Jan W.
In: Journal of Hypertension, Vol. 20, No. 10, 01.10.2002, p. 1981-1986.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Variable day/night bias in 24-h non-invasive finger pressure against intrabrachial artery pressure is removed by waveform filtering and level correction
AU - Westerhof, Berend E.
AU - Guelen, Ilja
AU - Parati, Gianfranco
AU - Groppelli, Antonella
AU - Van Montfrans, Gert A.
AU - Wieling, Wouter
AU - Wesseling, Karel H.
AU - Bos, Willem Jan W
PY - 2002/10/1
Y1 - 2002/10/1
N2 - Background: Twenty-four-hour finger arterial pressure (FAP) recordings show a negative bias against intrabrachial artery pressure (BAP) and the bias is greater during the night, thereby overestimating the nocturnal blood pressure dip. We have available a methodology with which to reconstruct BAP from FAP by waveform filtering (transfer function) and generalized level (bias) correction that reduces the bias for short-term blood pressure records. Objective: To investigate if this methodology also decreases the extra bias during the night, thereby yielding a better estimate of the nocturnal dip. Methods: Twenty-four-hour FAP and BAP blood pressure recordings were simultaneously obtained in eight healthy normotensive volunteers and 14 patients with hypertension (ages 19-60 years), during standardized scheduled activities. The data were analysed off-line, applying the brachial reconstruction technique (reBAP) consisting of a waveform filter and level correction. Simultaneous beats yielded systolic, diastolic and mean pressures that were averaged per 30 min, per day, per night, per activity, over the 24-h period, and for volunteers and patients separately. Results: Over the full 24 h, FAP systolic, diastolic and mean values for the total group differed from BAP by +1 ± 10, -8 ± 7 and -10 ± 8 mmHg (mean ± SD), respectively. Similarly, reBAPs differed by +1 ± 11, -2 ± 7 and -2 ± 7 mmHg. BAPs dipped by 20 ± 8, 13 ± 6 and 15 ± 6 mmHg, respectively, during the night. These dips were overestimated by +8, +4 and +4 mmHg by FAP, but not by reBAP: -1, +1 and +1 mmHg. The volunteer and the patient groups showed slight differences in results, but these were not statistically significant. Conclusions: The generalized reconstruction technique to obtain near-brachial pressure from non-invasive FAP almost completely removed bias over the full 24-h day-night period and improved tracking of diurnal changes for all three blood pressure values.
AB - Background: Twenty-four-hour finger arterial pressure (FAP) recordings show a negative bias against intrabrachial artery pressure (BAP) and the bias is greater during the night, thereby overestimating the nocturnal blood pressure dip. We have available a methodology with which to reconstruct BAP from FAP by waveform filtering (transfer function) and generalized level (bias) correction that reduces the bias for short-term blood pressure records. Objective: To investigate if this methodology also decreases the extra bias during the night, thereby yielding a better estimate of the nocturnal dip. Methods: Twenty-four-hour FAP and BAP blood pressure recordings were simultaneously obtained in eight healthy normotensive volunteers and 14 patients with hypertension (ages 19-60 years), during standardized scheduled activities. The data were analysed off-line, applying the brachial reconstruction technique (reBAP) consisting of a waveform filter and level correction. Simultaneous beats yielded systolic, diastolic and mean pressures that were averaged per 30 min, per day, per night, per activity, over the 24-h period, and for volunteers and patients separately. Results: Over the full 24 h, FAP systolic, diastolic and mean values for the total group differed from BAP by +1 ± 10, -8 ± 7 and -10 ± 8 mmHg (mean ± SD), respectively. Similarly, reBAPs differed by +1 ± 11, -2 ± 7 and -2 ± 7 mmHg. BAPs dipped by 20 ± 8, 13 ± 6 and 15 ± 6 mmHg, respectively, during the night. These dips were overestimated by +8, +4 and +4 mmHg by FAP, but not by reBAP: -1, +1 and +1 mmHg. The volunteer and the patient groups showed slight differences in results, but these were not statistically significant. Conclusions: The generalized reconstruction technique to obtain near-brachial pressure from non-invasive FAP almost completely removed bias over the full 24-h day-night period and improved tracking of diurnal changes for all three blood pressure values.
KW - Bias
KW - Blood pressure
KW - Brachial
KW - Day-night
KW - Dip
KW - Finger
KW - Pressure difference
UR - http://www.scopus.com/inward/record.url?scp=0036808295&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036808295&partnerID=8YFLogxK
U2 - 10.1097/00004872-200210000-00017
DO - 10.1097/00004872-200210000-00017
M3 - Article
VL - 20
SP - 1981
EP - 1986
JO - Journal of Hypertension
JF - Journal of Hypertension
SN - 0263-6352
IS - 10
ER -