Thermodilution and Fick cardiac index determinations following cardiac surgery.
With the thermodilution technique, repeated determination of cardiac index (CI) has become a rapid, easily accomplished, safe procedure. We paired 77 CI determinations measured by direct Fick and thermodilution techniques in 21 patients who underwent myocardial revascularization. Commercially available thermistor-tipped catheters and a cardiac output computer were used to determine CI according to the manufacturer's instructions. Oxygen consumption and arterial-venous oxygen content differences were measured directly to determine CI by the Fick method. Comparisons were made during mechanical ventilation with and without positive end-expiratory pressure (PEEP) and during spontaneous ventilation with and without PEEP. Cardiac indices measured by the two techniques were within +/- 0.5 L/min/m2 of each other only 76% of the time and within +/- 1.0 L/min/m2 96% of the time, if CI greater than or equal to 4.0 L/min/m2 were omitted. Ventilatory pattern had no apparent effect on results.
D002302:Cardiac Output; D003080:Cold Temperature; D001026:Coronary Artery Bypass; D006801:Humans; D007201:Indicator Dilution Techniques; D010100:Oxygen / Q000097:blood; D010101:Oxygen Consumption; D011182:Postoperative Care; D012121:Respiration, Artificial
D010100:Oxygen