Question

What is the condition in which the  R-R interval is declared premature?

(a) If it is less than 75% of the predicted interval

(b) If it is greater than 75% of the predicted interval

(c) If it is less than 85% of the predicted interval

(d) If it is greater than 85% of the predicted interval

I had been asked this question in class test.

Query is from Clinical Data Interchange/Exchange Standards topic in portion Telemedicine Technology of Biomedical Instrumentation

Answer 1

Correct choice is (c) If it is less than 85% of the predicted interval

The best I can explain: In timing classification, the observed R-R interval is compared to an estimate of the expected R-R interval. An R-R interval will be declared premature if it is less than 85% of the predicted interval. Similarly, an R-R interval is long if it is greater than 110% of the predicted value.