Non-invasive cardiac output assessment
AssigneeMayo Foundation for Medical Education and Research
InventorsPavol Sajgalik, Vaclav Kremen, Bruce D. Johnson
Life of this patent
Estimating the term…
Abstract
Non-invasive systems can be used to estimate cardiac output and stroke volume. For example, this document provides cuff occlusion systems and methods for their use so that cardiac output and stroke volume can be estimated in a non-invasive fashion. In some implementations, a patient's brachial artery is occluded by an inflatable cuff device for a period of time. A heart rate and a plurality of blood pressure pulse wave measurement curves can be measured using the cuff device. The data collected can be used to calculate an estimate of the patient's cardiac output and stroke volume.
Claims16
A method of measuring a cardiac output of a patient, the method comprising:
- occluding, using an inflatable cuff device for a period of time, a brachial artery of the patient;
- detecting, using the inflatable cuff while the brachial artery is occluded, a heart rate and a plurality of blood pressure pulse wave measurement curves;
- determining an average blood pressure pulse wave measurement curve of the plurality of blood pressure pulse wave measurement curves;
- determining an area under the average blood pressure pulse wave measurement curve;
- determining a maximal blood pressure of the average blood pressure pulse wave measurement curve;
- and
- determining the cardiac output of the patient, wherein the cardiac output equals the heart rate multiplied by the area under the average blood pressure pulse wave measurement curve and divided by the maximal blood pressure of the average blood pressure pulse wave measurement curve.
A system for measuring cardiac output of a patient, the system comprising:
- an inflatable cuff configured for occluding a brachial artery of the patient;
- a sensor coupled to the inflatable cuff and configured for detecting blood pressure pulse wave measurement curves of the brachial artery;
- and
- a controller device configured for:
- detecting, using the sensor while the brachial artery is occluded, a heart rate and a plurality of blood pressure pulse wave measurement curves;
- determining an average blood pressure pulse wave measurement curve of the plurality of blood pressure pulse wave measurement curves;
- determining an area under the average blood pressure pulse wave measurement curve;
- determining a maximal blood pressure of the average blood pressure pulse wave measurement curve;
- and
- determining the cardiac output of the patient, wherein the cardiac output equals the heart rate multiplied by the area under the average blood pressure pulse wave measurement curve and divided by the maximal blood pressure of the average blood pressure pulse wave measurement curve.
A method of measuring a stroke volume of a patient, the method comprising:
- occluding, using an inflatable cuff device for a period of time, a brachial artery of the patient;
- detecting, using the inflatable cuff while the brachial artery is occluded, a blood pressure pulse wave measurement curve;
- determining an area under the blood pressure pulse wave measurement curve;
- determining a maximal blood pressure of the blood pressure pulse wave measurement curve;
- and
- determining the stroke volume of the patient, wherein the stroke volume equals the area under the blood pressure pulse wave measurement curve divided by the maximal blood pressure of the blood pressure pulse wave measurement curve.
Dependencies are inferred from the claim text.