Method for measuring coronary flow reserve ratio without vasodilation agent

摘要

The pressure P1 of the heart coronary artery was measured by a blood pressure sensorTwo dimensional tube diameter and length of the blood vessel were obtained by contrast image.A three-dimensional blood vessel model is generated to obtain the three-dimensional tube diameter and length of the blood vessel.Measuring the time required for blood from the starting point to the end of a blood vesselBlood flow velocity V1 is calculated based on the time and blood vessel lengthCompute aortic pressure P2 in maximum hyperemiaThe blood flow velocity V2 in the maximum hyperemia state is calculated.Blood flow velocity V2 is defined as the coronary artery inlet velocityThe aortic pressure P2 is defined as the coronary artery inlet pressure paThe pressure loss. Delta. P of distal coronary artery stenosis is calculated from the coronary artery entrance.The mean pressure within the distal coronary artery is defined as PD = paThe method includes calculating the coronary angiographic blood flow reserve ratio caffr by expression caff = Pd / PA;No vasodilator neededContrast imageIt has excellent points that the blood flow reserve ratio can be calculated by aortic pressure and blood flow.Method of measuring coronary flow reserve ratio without vasodilation agent.