This report presents a well-documented link between vasodepressor syncope, a marked increase of low-frequency to high-frequency ratio (LF/HF) of heart rate variability response to orthostasis (sympathetic dominance), and the efficacy of beta blockers in preventing orthostatic symptoms and absence of tilt-induced syncope, with normalization of the LF/HF ratio response.
机构:
Virginia Tech Carilion Sch Med, Dept Emergency Med, Wilderness Med Fellowship, Roanoke, VA USAVirginia Tech Carilion Sch Med, Dept Emergency Med, Wilderness Med Fellowship, Roanoke, VA USA