h the intraarterial and the wrist cuff values, which were comparable. Correlations of blood pressure values with intraarterial measurement were 0.86 systolic and 0.75 diastolic (P 20 sec (sensitivity 22%, specificity 93.9%), age > 65 years (sensitivity 83%, specificity 54%), claudication symptoms in 5 sec or foot characteristics (absent hair, blue/purple color, skin coolness, or atrophy) conveyed little diagnostic information. Individual factors did not change disease probability to a clinically important degree. A stepwise logistic regression model identified four factors significantly (p .22). Whereas 95% of all comparisons between finger cuff and intra-arterial measurement had a discrepancy +/- 15 mm Hg. In 29 (74%) patients, the duration of errors > 10 mm Hg was 10 mm Hg was between 2 to 3 mins and in three (8%) patients, the errors lasted for > 3 mins. CONCLUSIONS: Our data provide a guide to the accuracy and reliability of noninvasive finger blood pressure measurements in critically ill patients. Although most test instrument measurements were reliable, in!
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