Multiple Choice
In which situation should synchronized cardioversion be used?
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18. The Heart
Electrical Conduction System of the Heart
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How can the heart rate be calculated using the QRS complexes on an electrocardiogram (ECG)?
A
Count the number of QRS complexes in a 6-second strip and multiply by 10.
B
Count the number of P waves in a 10-second strip and multiply by 6.
C
Measure the distance between two consecutive P waves and divide by 60.
D
Measure the distance between two consecutive T waves and divide by 60.
Verified step by step guidance1
Identify the QRS complexes on the ECG strip. These are the tall, narrow spikes that represent ventricular depolarization.
Select a 6-second strip of the ECG. This is typically marked on the ECG paper, often with hash marks at the top or bottom of the strip.
Count the number of QRS complexes within this 6-second strip. Each QRS complex represents one heartbeat.
Multiply the number of QRS complexes counted by 10. This calculation extrapolates the number of heartbeats in one minute, as there are 60 seconds in a minute.
The result of this multiplication gives you the heart rate in beats per minute (bpm).
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