Heart parameter measuring method and device

Abstract

A heart parameter measuring method comprises following steps: synchronously detecting electrocardiosignals and photoplethysmography signals and carrying out preprocessing; carrying out waveform contour analysis for the electrocardiosignals and the photoplethysmography signals which are preprocessed to obtain pulse wave arrival time and pulse wave inflection point area ratios; calculating a pulse wave reflection coefficient ratio according to the pulse wave inflection point area ratios; and estimating the pulse wave arrival time and the pulse wave inflection point area ratios to obtain blood pressure and heart output. By means of calculating the pulse wave inflection point area ratios obtained from the electrocardiosignals and the photoplethysmography signals, the pulse wave reflection coefficient ratio is obtained, then the pulse wave reflection coefficient ratio and the pulse wave arrival time are estimated so as to obtain the blood pressure and the heart output, the blood pressure and the heart output are synchronously measured, accuracy is guaranteed, invasive-method measurement is omitted, and operation convenience under a movement state is greatly improved.

Description

【Technical field】 [0001] The invention relates to human body parameter detection technology, in particular to a method and device for measuring heart parameters. 【Background technique】 [0002] Cardiac parameters include parameters such as blood pressure and cardiac output, which are direct indicators to describe cardiac performance and can be used for further calculation of cardiac parameters. For example, the product of blood pressure and cardiac output is cardiac output power, which in turn is the Patients with severe heart diseases such as cardiogenic shock can provide a basis for judging the risk level of the patient and the preset death index in the exercise state. [0003] However, in the process of measuring cardiac parameters, in order to ensure the accuracy in the exercise state, it is necessary to strictly ensure that the measurement of blood pressure and cardiac output are carried out simultaneously. Traditional blood pressure and cardiac output measurement meth...

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Problems solved by technology

For example, the invasive method includes the catheter method and the thermodilution method. The catheter method is an invasive blood pressure measurement method commonly used in clinical practice, which is to insert a catheter into the heart or blood vessel, but requires high operating costs; The trauma of the human body is relatively large, and the operation is relatively complicated; non-invasive methods include the Korotkoff method, oscillation method and volume clamp method for measuring the blood pressure of peripheral arteries such as the brachial artery, radial artery, and finger artery, as well as photoplethysmography based on photoplethysmography signals. The blood pressure measurement method is not suitable for long-term continuous monitoring and measurement scenarios under exercise due to the limitation of scale and weight

[0004] Neither the invasive method nor the non-invasive method can conveniently measure cardiac parameters in the motion state while ensuring the measurement accuracy, and there is a defect that it is difficult to operate in the motion state measurement scene

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