Table 2: Pacing for Vasovagal Syncope.

Single chamber atrial or ventricular pacing is not likely to have any benefit. Pacing at the lower rate limit will likely be ineffective. An algorithm to increase rate abruptly with AV synchrony at episode onset is desirable. Mechanisms to increase rate have utilised algorithms such as the rate-drop response, during which the rate increases abruptly if a gradual slowing is seen; or the algorithm associated with closed loop stimulation, during which pacing rate increases if there is evidence of changes in local impedance that may reflect changes in right ventricular contractility by a proprietary algorithm.