Method for estimating a central pressure waveform obtained with a blood pressure cuff
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A cloth cuff and pressure wave technology is applied in the field of estimating the central pressure waveform obtained by the blood pressure cuff bag, which can solve the problem of not considering isolation of the brachial artery and so on.
Inactive Publication Date: 2011-04-20
PULSECOR LTD
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Westerhof et al did not consider the use of a suprasystolic cuff to isolate the brachial artery from the peripheral circulation
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[0078] Using clinical data collected in the study of subjects who underwent cardiac catheterization at Auckland City Hospital led by Dr. Wil Harrison, the theory and model according to the present invention were experimentally verified.
[0079] Clinical validation
[0080] Under the leadership of Dr. Wil Harrison, data for clinical validation was collected from the Heart Research Laboratory of Auckland City Hospital. Twenty-seven subjects were recruited from consecutive cases, excluding those with known severe aneurysms, moderate to severe arrhythmia, or abnormal subclavian / brachial anatomy. The blood pressure cuff is used to non-invasively collect the oscillometric waveform of the upper heart contraction and analyze it using the model according to the present invention. At the same time, the catheter tip near the aortic root is used to collect 10-second intrusion pressure waveforms. Use the monitor to measure non-invasive blood pressure (NIBP), using its internal Welch Allyn o...
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Abstract
A physics-based mathematical model is used to estimate central pressure waveforms from measurements of a brachial pressure waveform measured using a supra-systolic cuff. The method has been tested in numerous subjects undergoing cardiac catheterisation. Central pressure agreement was within 11 mm Hg and as good as the published non-invasive blood pressure agreement between the oscillometric device in use and the so-called ''gold standard.'' It also exceeds international standards for the performance of non-invasive blood pressure measurement devices. The method has a number of advantages including simplicity of application, fast calculation and accuracy of prediction. Additionally, model parameters have physical meaning and can therefore be tuned to individual subjects. Accurate estimation of central waveforms also allow continuous measurement (with intermittent calibration) using other non-invasive sensing systems including photoplethysmography.
Description
[0001] Cross reference of related applications [0002] This application requires U.S. Patent Application No. 11 / 358,283 (now U.S. Patent Publication No. 2006 / 0224070-A1, published on October 5, 2006) filed on February 21, 2006, and a U.S. Patent filed on June 13, 2008 Application No. 12 / 157,854 (now U.S. Patent Publication No. 2009 / 0012411-A1, published on January 8, 2009), U.S. Provisional Application Serial No. 61 / 127,736 filed on May 15, 2008, and September 24, 2008 The right of priority is filed with U.S. Provisional Application No. 61 / 194,193. The subject matter of the invention disclosed and claimed here is related to U.S. Patent No. 5,913,826 issued on June 22, 1999, U.S. Patent No. 6,994,675 issued on February 7, 2006, and the aforementioned U.S. Patent Publication No. 2006 / 0224070-A1 and the U.S. The subject matter disclosed in Patent Publication No. 2009 / 0012411-A1 is related, and they are all incorporated herein by reference. Background technique [0003] The present ...
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