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Determining the optimal pacing intervention rate for vasovagal syncope.
A S Kurbaan1, A C Franzén, Z Stack
1Department of Cardiology, London Chest Hospital, London, UK. a_kurbaan@hotmail.com
Summary
Rate hysteresis pacemakers effectively manage vasovagal syncope. However, higher pacing rates did not significantly improve outcomes compared to standard rates in tilt testing studies.
Area of Science:
- Cardiology
- Neuroscience
Background:
- Vasovagal syncope is a common cause of recurrent syncope.
- Rate hysteresis pacemakers are used to manage this condition.
- The optimal pacing rate for intervention is not well-established.
Purpose of the Study:
- To evaluate the effectiveness of higher pacing intervention rates versus standard rates in patients with vasovagal syncope.
- To determine if repeat tilt testing is valuable for assessing pacemaker efficacy.
Main Methods:
- Twenty patients with rate hysteresis pacemakers for vasovagal syncope were studied.
- Patients underwent serial tilt testing with randomization to either standard (80-90 bpm) or high (120 bpm) pacing intervention rates.
- Objective assessment of syncope response during tilt testing was performed.
Main Results:
- Eighteen of twenty patients reported complete syncope abolition post-pacemaker implantation.
- Objective assessment in 8 patients showed no significant difference in time to syncope between standard (193+/-234s) and high (185+/-143s) pacing rates.
- Repeat tilt testing provided limited value in assessing pacing benefits.
Conclusions:
- Higher pacing intervention rates offer no significant advantage over standard rates in preventing syncope during tilt testing.
- Rate hysteresis pacing is effective in managing vasovagal syncope, but the intervention rate may not be critical.
- Further research may be needed to optimize pacemaker settings for vasovagal syncope.