Reflex and orthostatic
37%
56%
76%
Cardiac arrhythmias
13%
11%
Structural cardiopulmonary
4%
3%
5%
Non-syncopal T-LOC
10%
9%
6%
Unexplained
36%
20%
2%
Data pooled from six population-based studies (1499 patients).
Data pooled from four population-based studies (1640 patients).
Data from EGSYS 2 study (465 patients).
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