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Summary
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Comparing the effects of isobaric and hypobaric bupivacaine in lateral decubitus position. With operative side up, patients randomly received 3mL (15mg) spinal injection of bupivacaine mixed with 2mL of either normal saline (isobaric) or distilled water (hypobaric). Sensory level and degree of motor block were evaluated in nondependent and dependent sides. Hemodynamic changes were noted. In the hypobaric group, there was a prolonged time to sensory regression to L2 on the operative side; no difference in quality of motor block was noted. Hemodynamic changes were comparable. Spinal hypobaric bupivacaine is superior to isobaric.
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