METHOD FOR DETECTING HIGH AORTIC RIGIDITY IN PATIENTS SUFFERING CARDIOPATHOLOGIES Russian patent published in 2014 - IPC A61B8/06 

FIELD: medicine.

SUBSTANCE: blood flow is recorded by duplex scanning in descending and abdominal aorta in a combination with recording an ECG curve. The blood flow in the descending aorta is recorded using a sector probe placed within a substernal notch, while the abdominal blood flow is recorded with a convex transducer placed in a supraumbilical region. Scanning a segment of the descending aorta is combined with B-mode measurement of distance S₂ from a body surface to a blood flow location point. That is followed by measuring distance S₁ along a patient's body surface between the substernal notch and the point of the probe in a projection of supraumbilical bifurcation of aorta. That is followed by measuring a pulse wave transit time from the descending aorta to the bifurcation by measuring time T₁ from the point of Q peak on the ECG curve to the point of the spectral zero in a Doppler frequency shift in the descending aorta, and time T₂ from the points of Q peak on the ECG curve to the point of the spectral zero in a Doppler frequency shift in the abdominal aorta. A pulse-wave velocity is calculated by formula PWV=(S₁-S₂)/(T₂-T₁). Measuring PWV involves using median values of pulse-wave velocity in certain cardiac cycles the descending and abdominal aortas. High aortic rigidity is considered by high PWV: for the patients depending on the age.

EFFECT: method enables more accurate PWV measurement ensued by adjusting the measured pulse wave distance and using the developed accurate diagnostic criteria for evaluating the aortic rigidity for each age decade.

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