[Fiberoptic measurement of myocardial contraction--correlation of the signal with hemodynamic values].
In addition to the intracardial ECG, the mechanical myocard contraction should be used as another input signal for cardiac pacemakers and implantable defibrillators. Therefore a fiberoptical measurement system was designed. A sensor-fiber was placed in the coronary venous system. An opto-electronic system converts the optical losses, caused by bending of the fiber, into a proportional voltage. This method allows measuring of the left ventricular myocard contraction strength. By theoretical calculations it was shown, that a good correlation of the sensor-signal and the left ventricular radius can be expected. Additional investigations using an isolated beating pig heart were performed. A high correlation of the sensor-signal and the left ventricular stroke volume was shown.
Müller
S
S
Lehrstuhl für Biomedizinische Technik, Medizinische Fakultät, Ruhr-Universität Bochum, MA 4/55, 44780 Bochum. mueller@biomed.ruhr-uni-bochum.de
Kloppe
A
A
Mügge
A
A
Werner
J
J
D000818:Animals; D017147:Defibrillators, Implantable; D004562:Electrocardiography / Q000295:instrumentation*; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006439:Hemodynamics / Q000502:physiology*; D009200:Myocardial Contraction / Q000502:physiology*; D010138:Pacemaker, Artificial; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013552:Swine; D016277:Ventricular Function, Left / Q000502:physiology