Key result
A high baseline LF/HF ratio (>2.5) resulted in a significantly greater fall in systolic blood pressure after subarachnoid block compared to a low LF/HF ratio (<2.5) (30.26% vs 15.22%).
Why the study?
Does a high baseline LF/HF ratio predict hypotension after subarachnoid block in adults undergoing elective infra-umbilical surgery?
Population
100 adult patients scheduled for elective infra-umbilical surgery under subarachnoid block
Comparison
High baseline low-to-high frequency ratio on… vs Low baseline LF/HF ratio on preoperative heart…
Design
Cohort, randomized, blind
Follow-up
intraoperative (after subarachnoid block)
Authors
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Preoperative HRV may stratify hypotension risk after subarachnoid block; leaves open whether it improves outcomes or warrants routine use.
RCT (n=100)
Blind
Randomized
Does a high baseline LF/HF ratio predict hypotension after subarachnoid block in adults undergoing elective infra-umbilical surgery?
Absolute Event Rate: 30.26% vs 15.22%
Preoperative assessment of heart rate variability, specifically the LF/HF ratio, can effectively predict the risk of hypotension following subarachnoid block.
Sharma et al. (2011) conducted an RCT in Elective infra-umbilical surgery under subarachnoid block (n=100). High LF/HF ratio (>2.5) vs. Low LF/HF ratio (<2.5) was evaluated on Fall of baseline systolic blood pressure. A high baseline LF/HF ratio (>2.5) resulted in a significantly greater fall in systolic blood pressure after subarachnoid block compared to a low LF/HF ratio (<2.5) (30.26% vs 15.22%).
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