Correction method of pulse wave transit time related to diastolic pressure

Abstract

The invention belongs to the technical field of arterial blood pressure measurement. The invention provides a correcting method for pulse wave propagation time related to diastolic pressure. The correcting method is adopted for self-adaptively correcting the abnormal change in the pulse wave propagation time related to diastolic pressure resulted from blood transfusion and infusion, vasoactive agents and operation intervention under clinic conditions. The correcting method provided by the invention comprises the following steps: detecting ear pulse waves and toe pulse waves in a same cardiac cycle in real time; calculating the pulse wave propagation time related to diastolic pressure; extracting a correcting variable according to the morphological characteristics of the pulse waves; acquiring a correcting matrix; and correcting the abnormal change in the pulse wave propagation time. The propagation time after being corrected can be applied to the present mathematic model, the diastolic pressure in each cardiac cycle can be continuously measured under the clinic conditions, and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of arterial blood pressure measurement, in particular to a pulse wave propagation time correction method related to diastolic pressure. Background technique [0002] Arterial blood pressure is one of the main indicators to reflect the state of the circulatory system and evaluate organ perfusion, and is an important vital sign parameter for perioperative monitoring. At present, the commonly used blood pressure monitoring methods in the perioperative period can be divided into invasive measurement and noninvasive measurement. Invasive measurement refers to the technology of placing special pipes into the body's circulatory system, converting mechanical potential energy into electronic signals through converters, and displaying blood pressure changes in real time on monitoring equipment. Invasive measurement methods can measure stroke-to-stroke blood pressure continuously and accurately, but the possible dange...

AI Technical Summary

Problems solved by technology

However, during the perioperative period, under the influence of confounding factors such as fluid therapy, drugs, surgical operations, and temperature, the patient’s circulatory system will experience a series of abnormal changes in PTT. Using the abnormal PTT and the inherent mathematical model to estimate blood pressure will produce large error

Since the relationship between the variable PTT and blood pressure no longer has a definite regularity, even if the mathematical model parameters are frequently calibrated to adapt to the PTT variation, the fundamental problem cannot be solved, and the accuracy and real-time requirements of clinical measurement cannot be met.

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