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2. Calculate the heart rate for the tracing. What is the heart rate? Is the heart rate normal or abnormal?

2. Calculate the heart rate for the tracing. What is the heart rate? Is the heart rate normal or abnormal?

Phlebotomy Essentials
Phlebotomy Essentials
6th Edition
ISBN:9781451194524
Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Chapter1: Phlebotomy: Past And Present And The Healthcare Setting
Section: Chapter Questions
Problem 1SRQ
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The electrocardiograph records the tracing at standard speed of 25 mm/second. This allows a person to deter- mine the heart rate and the duration of the intervals. Each small box on the ECG tracing measures 0.04s, and each large box measures 0.20s. Five large boxes together measure 1 second. Determining the duration of most intervals is simple by counting the small or large boxes and add the seconds together. To calculate the heart rate, count the number of large boxes, and divide 300 by this number. For example, if you count 4.2 boxes, 300/4.2=71 beats per minute. The normal values or the periods are given in Table 6-3 provided below. Period Normal Value Table 6-3 Normal Values for ECG Periods Heart rate 60-100 beats per minute R-R interval 0.60-1.0s P-R interval 0.12-0.20s Q-T interval 0.42-0.44s QRS complex duration Less than or equal to 0.12s
Transcribed Image Text:The electrocardiograph records the tracing at standard speed of 25 mm/second. This allows a person to deter- mine the heart rate and the duration of the intervals. Each small box on the ECG tracing measures 0.04s, and each large box measures 0.20s. Five large boxes together measure 1 second. Determining the duration of most intervals is simple by counting the small or large boxes and add the seconds together. To calculate the heart rate, count the number of large boxes, and divide 300 by this number. For example, if you count 4.2 boxes, 300/4.2=71 beats per minute. The normal values or the periods are given in Table 6-3 provided below. Period Normal Value Table 6-3 Normal Values for ECG Periods Heart rate 60-100 beats per minute R-R interval 0.60-1.0s P-R interval 0.12-0.20s Q-T interval 0.42-0.44s QRS complex duration Less than or equal to 0.12s
2. Calculate the heart rate for the tracing. What is the heart rate? Is the heart rate normal or abnormal?
Transcribed Image Text:2. Calculate the heart rate for the tracing. What is the heart rate? Is the heart rate normal or abnormal?
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