[A new thermodilution catheter for the determination of heart-minute volume in the arterial system].
A double-lumen polyethylene pigtail catheter (F8, length 100 cm) for the determination of cardiac output (CO) in the arterial system is described. Following femoral insertion of the catheter, 10 ml of ice-cold saline is injected into the left ventricle through the distally ending lumen (0.8 mm2). Through the second lumen (0.8 mm2) which opens 50 cm behind the catheter tip, a thermistor probe (F3, teflon) is advanced into the descending aorta for recording of thermodilution curves. In 21 patients CO was determined first by the Fick method and then by thermodilution in the arterial system. CO by thermodilution correlated favorably with CO by Fick (r = 0.92, SEE 518 ml = 11% of the mean value). There was no systematic deviation from the reference CO. A similarly good correlation existed between stroke volume (SV) by thermodilution and SV by Fick (r = 0.86 SEE 11 ml = 15% of the mean value). Heart rate during thermodilution was 71 bpm, during Fick output estimation 72 bpm (not significant). Following withdrawal of the thermistor probe, simultaneous measurements of left ventricular and aortic pressures can be performed.
D006328:Cardiac Catheterization / Q000295:instrumentation; D002302:Cardiac Output; D006331:Heart Diseases / Q000503:physiopathology; D006801:Humans; D008722:Methods; D013318:Stroke Volume; D013815:Thermodilution / Q000295:instrumentation*; D016276:Ventricular Function
Ein neuer Thermodilutionskatheter zur Bestimmung des Herzminutenvolumens im arteriellen System.