The Nurse Needs to Estimate Quickly the Heart Rate for a Patient

The nurse needs to estimate quickly the heart rate for a patient with a regular heart rhythm. Which method will be best to use?

A) Print a 1-minute electrocardiogram (ECG) strip and count the number of QRS complexes.
B) Count the number of large squares in the R-R interval and divide by 300.
C) Use the 3-second markers to count the number of QRS complexes in 6 seconds and multiply by 10.
D) Calculate the number of small squares between one QRS complex and the next and divide into 1500.