Continuous, non-invasive volume-clamp blood pressure: determinants of performance

Lal, Sara; Mihailidou, Anastasia S.; Cejnar, M.; Henderson, Robyn J.; Jones, Michael; Hunyor, Stephen N.

doi:10.1097/00004872-199312000-00014

Cited by 17 publications

(7 citation statements)

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“…In case of two adjacent fingers this requirement is relatively well fulfilled. It has been reported, that the blood pressure readings from the index, middle and ring fingers have no greater variability than that attributable to the finger-insertion process [12]. However, in some subjects these differences have been found to exceed 10 mmHg [11].…”

Section: Discussionmentioning

confidence: 95%

Asymmetric time-dependent model for the dynamic finger arterial pressure–volume relationship

2006

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The volumetric pulses in the finger PPG signal appear as an information source for several indirect measurement methods. In this study we modelled transformation of pressure pulses into volume pulses in a wide transmural pressure range. The noninvasive finger arterial pressure and photoplethysmographic (PPG) signals were simultaneously registered in 13 healthy subjects while the pressure in the PPG cuff ramped up and down. The nonlinearity of the pressure-volume (P-V) relationship was modelled by an asymmetric function, consisting of two arctangents, each for a different pressure region. The time dependency was described by the first order lag. The disturbing effect of slow creeps in the PPG signal was suppressed by an equal filtering of the measured and model-predicted signal. The differences between the two estimates of the subject's P-V relationship for the increasing and decreasing cuff pressure were small thus showing the repeatability of this method, which can be used for the characterization of individual finger arterial behaviour as well as its changes.

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Section: Discussionmentioning

confidence: 95%

Asymmetric time-dependent model for the dynamic finger arterial pressure–volume relationship

2006

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“…However, some situation-or procedurerelated errors are not uncommon [13,14]. For example, patients with acrocyanosis are less suitable for Finapres or Portapres recordings.…”

Section: Resultsmentioning

confidence: 99%

“…Lights off 2300 to 0700 h. Black dots, first recording; open dots, second recording. of procedure-related errors have been identified [13,14]. Cold fingers and malapplication of the cuff may cause important errors and reduce repeatability.…”

Section: Discussionmentioning

confidence: 99%

Reproducibility of twenty-four-hour finger arterial blood pressure, variability and systemic hemodynamics

Voogel

Montfrans

1997

Journal of Hypertension

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“…Pressure in the cuff is adjusted by a speaker coil mechanism, driven by an IBM PC0AT-compatible computer. This device has been developed~Cejnar et validated~Lal, Henderson, Cejnar, Hunyor, 1995;Lal et al, 1993! Continuous noninvasive BP~CNIBP! measurement is initiated by adjustment of cuff pressure to achieve maximum finger pulsation from which a reference volume is derived.…”

Section: Blood Pressure Measurementmentioning

confidence: 99%

Effect of feedback signal and psychological characteristics on blood pressure self‐manipulation capability

Lal¹,

Henderson²,

Carter

et al. 1998

Psychophysiology

Self Cite

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Blood pressure presentation mode and personality are likely to influence biofeedback outcome. Thirty-six normotensive subjects were randomly assigned to visual or auditory continuous systolic feedback. "Distracting speech" and "broad band noise" were also superimposed and the effect on the biofeedback response was investigated. Psychological influence was also investigated. Systolic pressure reduction of 4 +/- 4.3 mmHg (visual, p = .04) and 5 +/- 5.5 mmHg (visual + auditory, p = .03) were achieved compared with auditory feedback (2 +/- 4.7 mmHg), which was less effective. The addition of noise or speech had no effect on the systolic response, but speech adversely affected diastolic reduction (p = .04). Mood (p = .003) was associated with systolic lowering, whereas increased trait anxiety (p = .06) and expectation (p = .03) had trends for opposite effects. Increased anger-hostility, state-anxiety, and expectation (p = .06) had links with systolic raising capability. We conclude that feedback modality and psychological characteristics have implications for studies investigating blood pressure manipulation capability.

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Continuous, non-invasive volume-clamp blood pressure: determinants of performance

Cited by 17 publications

References 0 publications

Asymmetric time-dependent model for the dynamic finger arterial pressure–volume relationship

Asymmetric time-dependent model for the dynamic finger arterial pressure–volume relationship

Reproducibility of twenty-four-hour finger arterial blood pressure, variability and systemic hemodynamics

Effect of feedback signal and psychological characteristics on blood pressure self‐manipulation capability

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