What is the role of ultrasonography in the workup of first-degree atrioventricular (AV) block?

Updated: Jan 06, 2020
  • Author: Jamshid Alaeddini, MD, FACC, FHRS; Chief Editor: Jose M Dizon, MD  more...
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In patients with first-degree AV block and left ventricular systolic dysfunction, Doppler ultrasonography may be used to document an improvement in cardiac output during dual-chamber pacing at short AV delay. This may provide evidence for the appropriateness of implanting a permanent pacemaker for hemodynamic support in such patients.

More recently, cardiac resynchronization therapy (ie, biventricular pacing) has been applied in patients with cardiomyopathy, congestive heart failure, or intraventricular conduction delay (IVCD). [27] First-degree AV block is frequently present in these patients as well.

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