Systematic Errors in Estimating Mean Blood Pressure from Finger Blood Pressure Measurements

The mean blood pressure (BP) can be accurately estimated from indirect measurements of brachial artery pressure, i.e. mean BP = diastolic BP + 1/3 pulse pressure. Although this equation has been used as a surrogate of mean systemic pressure, it is unknown whether this approximation can be validly ap...

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Bibliographic Details
Published in:Blood pressure 1998, Vol.7 (5-6), p.277-281
Main Authors: O'CALLAGHAN, C. J, STRAZNICKY, N. E, KOMERSOVA, K, LOUIS, W. J
Format: Article
Language:English
Subjects:
Adrenergic beta-Agonists - pharmacology
Arm - blood supply
Arterial hypertension. Arterial hypotension
Biological and medical sciences
Blood and lymphatic vessels
Blood Pressure Determination - methods
Cardiology. Vascular system
Clinical manifestations. Epidemiology. Investigative techniques. Etiology
Diagnostic Errors
Female
Fingers - blood supply
Humans
Isoproterenol - pharmacology
Male
Medical sciences
Middle Aged
Phenylephrine - pharmacology
Reference Values
Regional Blood Flow - drug effects
Regional Blood Flow - physiology
Reproducibility of Results
Vasoconstrictor Agents - pharmacology
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Summary:The mean blood pressure (BP) can be accurately estimated from indirect measurements of brachial artery pressure, i.e. mean BP = diastolic BP + 1/3 pulse pressure. Although this equation has been used as a surrogate of mean systemic pressure, it is unknown whether this approximation can be validly applied to distal vascular beds. Therefore we determined the accuracy of this method as an estimate of the mean pressure in distal arteries by measuring finger BP with the Finapres device in 16 normotensive and 12 hypertensive subjects. The "calculated" and measured values of mean BP were compared when subjects were resting and during manoeuvres which aimed to alter the shape of the pulse waveform. Although closely correlated with the measured value, the "calculated" resting mean BP was systematically greater (+2.7+/-0.7 mm Hg, p
ISSN:0803-7051
1651-1999
DOI:10.1080/080370598437123