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. 2017 May 8;33(6):562–567. doi: 10.1016/j.joa.2017.03.008

Table 2.

Expected benefit of pacing in patients with different types of AVB.

Clinical forms Expected syncope recurrence rate at 2 years follow-up on cardiac pacing
  • –

    ECG documented I-AVB

  • –

    ECG documented EI-AVB

 High efficacy (≤5% recurrence rate)
  • –

    ECG documented EV-AVB, no hypotensive susceptibility

 Moderate efficacy (5–20% recurrence rate)
  • –

    Unexplained syncope and BBB (undocumented AVB; empiric pacing)

  • –

    ECG documented EV-AVB and hypotensive susceptibility

 Low efficacy (>20% recurrence rate)

Abbreviations: AVB=atrioventricular block; ECG=electrocardiography; I-AVB=intrinsic atrioventricular block; EI-AVB=extrinsic idiopathic atrioventricular block; EV-AVB=extrinsic vagal atrioventricular block; BBB=bundle branch block