Being the housing and the calculation device and the photodetector in the device which watches the heart of the patient, in order distance to the blood vessel which carries the blood from the photodetector, and the signal which shows the diameter of the blood vessel to offer to the calculation device, in order to offer the signal which was constituted, shows the photodetector and the speed of the blood which passes by the blood vessel to the calculation device, in order to offer the signal which shows the Doppler sensor which is formed and the plural electric stimuli which move the heart to pump system to the calculation device, the ECG sensor which is formed and, it includes, the device. The calculation device, oxygen saturation of the blood, blood flow, calculates the blood pressure, heart rate and the parameter which includes the heart beat coming out quantity making use of the signal from the photodetector, the Doppler sensor, and the ECG sensor.患者の心臓を監視する装置において、ハウジングと、算出装置と、光センサーであって、光センサーから血液を運ぶ血管までの距離、ならびに血管の直径を示す信号を算出装置に提供するように構成された、光センサーと、血管を通る血液の速度を示す信号を算出装置に提供するように構成されたドップラーセンサーと、心臓をポンプ式に動かす複数の電気刺激を示す信号を算出装置に提供するように構成されたECGセンサーと、を含む、装置。算出装置は、光センサー、ドップラーセンサー、およびECGセンサーからの信号を用いて、血液の酸素飽和度、血流量、血圧、心拍数および心拍出量を含むパラメータを算出する。
