Atrioventricular Block: 1st Degree

ECG Features

Figure 1: ECG Strip[1]

A first degree atrioventricular (AV) block occurs when electrical impulses moving through the AV node are delayed but not blocked.[2] A first degree AV block is present when the PR interval exceeds 0.30 sec.

Table 1: ECG Characteristics[2]

Clinical Significance[3]

  • A first degree heart block does not cause haemodynamic disturbance; thus, no specific treatment is needed.

ECM Features

Additional Information

References

  1. First Degree Heart Block [Online image]. (2013). Retrieved July 19, 2016, from http://www.practicalclinicalskills.com/ekg-reference-guide-details?lessonID=35
  2. First Degree Heart Block. (n.d.). Retrieved July 27, 2016, from http://www.practicalclinicalskills.com/ekg-reference-guide-details?lessonID=35
  3. First Degree Heart Block. (n.d.). Retrieved August 8, 2016, from http://lifeinthefastlane.com/ecg-library/basics/first-degree-heart-block/