Noninvasive continuous blood pressure measurement from the finger: Optimal measurement conditions and factors affecting reliability

Abstract

We recorded finger arterial blood pressure (FINAP) in 50 male patients during various types of surgical operations. Three different types of cuffs were used on four fingers of each patient. Measurements were made by the arterial volume-clamp method of Penaz. The FINAP measurements were compared with pressure data obtained ipsilaterally from a radial artery catheter-transducer system (intraarterial pressure [IAP]) to find optimal recording conditions and to document factors affecting FINAP readings. The thumb, with a specially designed cuff, gave the most accurate results. The mean FINAP - IAP difference for the thumb was -4.8 mm Hg for systolic pressure, 1.49 mm Hg for diastolic pressure, and 0.29 mm Hg for mean pressure. The differences were statistically significant for systolic and diastolic pressure but not for mean pressure. The regression slope for thumb systolic FINAP/IAP was 0.979, that for thumb diastolic FINAP/IAP was 0.963, and that for mean thumb FINAP/IAP was 0.996, whereas the intercepts were 7.499 for systolic pressure, 0.802 for diastolic pressure, and 0.083 for mean pressure. The correlation coefficients were 0.945 (systolic), 0.884 (diastolic), and 0.949 (mean). The correlation coefficients with the other fingers ranged from 0.502 to 0.922 for systolic pressure, 0.757 to 0.932 for diastolic pressure, and 0.767 to 0.892 for mean pressure. The slopes for the various finger-cuff combinations ranged from 0.537 to 0.996, and the intercepts ranged from 0.083 to 32.387 from mean pressure. In 3 patients (6%) the FINAP measurement was not possible because of insufficient peripheral circulation. In 9 other patients (18%) the FINAP measurements were not accurate during some periods of time.(ABSTRACT TRUNCATED AT 250 WORDS)

Can Cerebrovascular Reactivity Be Assessed Without Measuring Blood Pressure in Patients With Carotid Artery Disease?

“…Additionally, uncertainties in the CVR are inevitable because of the indirect measurement of the CBF, 9 arterial BP, 30 and arterial blood gas 31 during changes in PCO 2 . Although the noninvasive finger pressure measurement was applied previously to monitor BP during inhalation of 5% CO 2 in air, its validation during vasodilation can only be extrapolated from its accuracy during vasoconstriction.…”

The Role of Angry Rumination and Distraction in Blood Pressure Recovery From Emotional Arousal

“…This method uses a finger cuff, which was worn on the third finger of the nondominant hand. The method of operation of the Finapres monitor has been described in detail by several authors (42)(43)(44)(45). It has been shown to track intraarterial readings extremely well, even during sudden changes in blood pressure (46), making it quite useful for reactivity and recovery testing.…”

Accuracy and precision of blood pressure determination with the Finapres: an overview using re-sampling statistics

“…12 Therefore any periheral BP method such as the Finapres requires rigorous validation to understand its strengths and limitations. The accuracy of the Finapres compared with intra-arterial reference pressure has now been assessed in many studies [3][4][5][6][7][8][9][10][13][14][15][16][17][18][19][20][21][22][23] without any clear consensus emerging on the average performance of the method; precision data has been infrequently reported. 20,24 This paper is a synthesis of these literature data; a novel statistical method of re-sampling allowed a global overview of the performance of the system to be derived.…”