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. 2022 Oct 13;9:1016420. doi: 10.3389/fcvm.2022.1016420

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Copyright © 2022 Williams, Khan and Claydon.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Kaplan–Meier syncope-free survival curve. Pooled time to first syncopal recurrence over a 1-year follow up in groups provided with usual care and trained in counter pressure maneuvers (CPM), and controls (usual care only) were compared (9, 87). Each study followed patients with vasovagal syncope who experienced prodromal symptoms prior to syncope. Data reported by Croci et al. (86) and Romme et al. (93), (dashed) did not include a control group and therefore were not included in combined analysis.