![]() ![]() angina, attainment of 85% of predicted maximum heart rate, abnormal blood pressure response or excessive dyspnoea did not indicate consistently a need to terminate the test. If your subject, leads, harness, or recording hardware is in close proximity to another source of 100 kHz signal (such as another impedance cardiograph), it is possible that the signal could interfere with the cardiac impedance measurements. In eight patients (EF 40.0 +/- 3.4%, SEM) CO response was abnormal with either a decrease or a failure to increase with increasing workloads. The carrier signal for cardiac impedance runs at a frequency of 100 kHz. ![]() Impedance cardiography was incorporated into routine exercise testing on a bicycle ergometer for a group of 15 patients (mean age 53.2 +/- 3.0 yrs, SEM) who had sustained a major myocardial infarct 6 to 12 months previously, (EF 38.1 +/- 3.5, SEM). ![]() CO was measured at the end of each 3-min stage. Reproducibility for CO over one week was highly significant (r 0.94 P less than 0.001). Impedance cardiography was incorporated into routine exercise testing on a bicycle ergometer for a group of 15 patients (mean age 53.2 +/- 3.0 yrs, SEM) who had sustained a major myocardial infarct 6 to 12 months previously, (EF 38.1 +/- 3.5%, SEM). Reproducibility for CO over one week was highly significant (r = 0.94 P less than 0.001). Over a range of COs between 4 and 18 min-1 there was no systematic error. The method was compared with the direct Fick method. This investigation was undertaken to determine whether impedance cardiography could be used in such patients to assess CO response to exercise. ejection fraction-EF) are poor predictors of the changes in cardiac output (CO) which occur with exercise. Invasive studies in patients with left ventricular dysfunction show that data at rest (e.g. ![]()
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