Method and apparatus for continuous measurement of cardiac output and SVR
First Claim
1. A method for measuring cardiac output and system vascular resistance (SVR) of a patient by analyzing the patient'"'"'s blood pressure signal waveform, wherein said waveform includes a plurality of successive peaks corresponding to a plurality of systolic and diastolic portions of the signal, comprising the steps of:
- (a) detecting an analog signal representative of the blood pressure of the patient;
(b) converting said analog signal to a digital signal;
(c) low-pass filtering said digital signal;
(d) extracting a plurality of parameters from said filtered digital signal; and
(e) calculating cardiac output and SVR values on the basis of said extracted parameters,wherein said step of extracting includes determining an interval of time between a point of maximum pressure of a systolic portion of said blood pressure signal waveform and a point at which a first dicrotic notch following said point of maximum pressure is detected.
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Abstract
A method of continuously monitoring cardiac output and SVR of a patient by analyzing the blood pressure signal. The signal can be measured directly by the use of catheters placed into various arteries, in particular a radial artery or a femoral artery, or non-invasive methods such as electrooptic means, or using a piezoelectric pressure transducer. Various parameters are extracted from the blood pressure signal waveform in order to calculate the cardiac output of the patient and other hemodynamic data.
117 Citations
18 Claims
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1. A method for measuring cardiac output and system vascular resistance (SVR) of a patient by analyzing the patient'"'"'s blood pressure signal waveform, wherein said waveform includes a plurality of successive peaks corresponding to a plurality of systolic and diastolic portions of the signal, comprising the steps of:
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(a) detecting an analog signal representative of the blood pressure of the patient; (b) converting said analog signal to a digital signal; (c) low-pass filtering said digital signal; (d) extracting a plurality of parameters from said filtered digital signal; and (e) calculating cardiac output and SVR values on the basis of said extracted parameters, wherein said step of extracting includes determining an interval of time between a point of maximum pressure of a systolic portion of said blood pressure signal waveform and a point at which a first dicrotic notch following said point of maximum pressure is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for measuring cardiac output and system vascular resistance (SVR) of a patient by analyzing a blood pressure signal waveform of the patient, comprising:
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means for detecting an analog signal representative of the blood pressure of the patient; means for converting said analog signal to a digital signal; means for low-pass filtering said digital signal; means for extracting a plurality of parameters from said filtered digital signal; and means for calculating a cardiac output value and an SVR value on the basis of said extracted parameters, wherein said means for extracting includes a means for determining an interval of time between a point of maximum pressure of a systolic pressure of said blood pressure signal waveform and a point at which a first dicrotic notch following said point of maximum pressure is detected. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification