Posts Tagged ‘Long-term Reproducibility

Neither Kappler et al, Simonton et al, nor Weber and Janicki expressed reproducibility in terms of standard deviation. Instead they correlated the results obtained in many patients from one test with those of another; a slope close to one and an intercept close to zero, a significant correlation >0.77, or a low standard error of the […]

The measurement of gas exchange and ventilatory data during exercise testing is becoming commonplace in assessing the severity of cardiac or circulatory failure and ventilatory disease, in distinguishing cardiac and circulatory from ventilatory causes of exertional dysp­nea, and in assessing the efficacy of medical therapy To date this has been accomplished primarily on the basis […]

The CVAR for each variable as a function of exercise stage is presented in Figures 1 through 4 for all patients. As can be seen, for all but one (systolic BP, Fig 1) of the variables, there was a tendency for CVAR to be greater at rest and the beginning stages of exercise than it […]

Data and Statistical Analysis For each stage of exercise, a representative value of each variable (ie, Vo2, Vco2, Vt, respiratory rate, Ve, and HR) was obtained by averaging the breath-by-breath results over the last 30 s of the stage. Since there was only one determination of systolic and diastolic BP during each stage, there was […]

Present-day technology has greatly facilitated the monitoring of respiratory gas exchange in the clinical exercise laboratory and has provided an im­portant adjunct to the evaluation of patients with stable heart failure. On-line, breath-by-breath meas­urements of oxygen uptake (Vo2), carbon dioxide production (VcOa), and minute ventilation (Ve) are now possible. The monitoring of these variables to­gether […]