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Venous flow dynamics during spinal block in normotensive and hypertensive elderly patients: a duplex ultrasonographic study
Author(s) -
KIL H. K.,
SUK E. H.,
LEE M. H.,
BANG E. C.,
HONG JY.
Publication year - 2012
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.2011.02617.x
Subject(s) - medicine , anesthesia , blood flow , blood pressure , popliteal vein , hemodynamics , heart rate , venous blood , venous return curve , cardiology , venous thrombosis , thrombosis
Background Spinal block induces hyperkinetic change in lower extremity blood flow. We compared the venous flow dynamic responses to spinal block in normotensive and hypertensive elderly patients. Methods Following spinal block using 10 mg 0.5% (w/v) bupivacaine, we measured changes in blood pressure, heart rate, and venous flow dynamics of the popliteal vein by duplex ultrasonography in 20 normotensive ( NBP group) and 18 hypertensive ( HIBP group) patients. Results Spinal block caused significant decreases in blood pressure in both groups; similar rates of hypotension were observed. At baseline, peak velocity, time‐averaged maximum velocity, and time‐averaged mean velocity were higher in the HIBP than in the NBP group. During spinal block, peak velocity increased in both groups, and the between‐group differences were no longer significant. At baseline, volume flow in the two groups was similar and increased by 141.5% in the NBP and 131.7% in the HIBP group during spinal block. Conclusions Blood pressure and flow dynamics in the popliteal vein showed similar changes during spinal anaesthesia in elderly patients taking antihypertensive medication and normotensive patients, despite differences in baseline values.