Standardized diagnostic evaluation determined the aetiology of syncope in 89% of patients. Diagnostic yield of specific diagnostic procedures was different. Initial evaluation resulted in diagnosis in one-third of patients.
AA genotype of A 1166C polymorphism in the ATR1 gene may be associated with hypotension and decline in sympathetic tone during HUT. Its role in genetic predisposition to vasovagal syncope cannot be excluded.
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