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Step 4 – PR interval (PRi) - Course # 318-7

Description

  • Measurement of the PR interval reflects the amount of time from the beginning of atrial depolarization to the beginning of ventricular depolarization.
  • Plainly stated, this measurement is from the beginning of the P wave to the beginning of the QRS complex.
  • The normal range for PR interval is: 0.12 – 0.20 seconds (3 to 5 small boxes)
  • It is important that you measure each PR interval on the rhythm strip.
  • Some tracings do not have the same PRi measurement from one cardiac complex to the next. Sometimes there is a prolonging pattern, sometimes not.
  • If the PR intervals are variable, report them as variable, but note if a pattern is present or not.
analysis ecg image 113 analysis ecg image 114

PR Interval Practice 1

Analyze this tracing. What is the PR interval Measurement?

analysis ecg image 115
Reveal Answer


PR Interval Practice 2

Analyze this tracing. What is the PR interval Measurement?

analysis ecg image 116
Reveal Answer





318 Step 4 – PR interval (PRi) - Course # 318-7