| 摘要 |
The system includes an inflatable cuff which is inflatable to a pressure above systolic pressure and deflatable to a pressure below diastolic pressure. A pressure transducer connected to the inflatable cuff generates a signal which is a function of cuff pressure. A microphone picks up Korotkov sounds, and artifacts, during deflation of the cuff and electrodes attached to the subject pick up electrocardiographic signals. The peak of the ECG R-wave is detected by R-wave peak detection techniques. Many, but not all artifacts, are removed from the microphone output by use of K-sound detection techniques. The pressure transducer output is converted to digital form for transfer to a digital computer and storage in the computer memory. The time of arrival of the peak R-wave signals and associated K-sound and artifact signals also is stored in the computer memory. RK intervals comprising the time interval between the time of arrival of R-wave signal and the associated K-sound or artifact signal are determined. Together with the associated cuff pressure, these establish several RK interval versus cuff pressure points. |
