Deliberate hypotensive epidural anesthesia for patients with normal and low cardiac output.
Academic Article
Overview
abstract
The use of hypotensive anesthesia is contraindicated in patients with ventricular dysfunction, even though afterload reduction often improves ventricular performance. The purpose of this study was to prospectively assess systemic hemodynamic responses to deliberate hypotension with epidural anesthesia in patients with chronic left ventricular dysfunction. Hemodynamic measurements were performed in 29 patients undergoing total hip arthroplasty under deliberate hypotensive epidural anesthesia using low-dose intravenous epinephrine infusion to maintain mean arterial pressure (MAP) at 50-60 mm Hg. Intraoperative MAP decreased from 100 +/- 16 to 56 +/- 9 mm Hg by 30 min after epidural injection (P < 0.0005). Concurrently, cardiac index (CI) increased from a preanesthetic baseline value of 2.9 +/- 0.5 to 3.3 +/- 0.9 L.min-1.m-2 at 30 min (P < 0.005) after epidural injection and stroke volume index (SVI) increased from 41 +/- 8 to 50 +/- 14 mL.beat-1.m-2 30 min after epidural injection (P < 0.005). Heart rate and central venous and pulmonary artery diastolic pressures were maintained under hypotension with epidural anesthesia in all patients. During deliberate hypotension with epidural anesthesia, patients with a history of congestive heart failure or low preanesthetic CI (< or = 2.5 L.kg-1.m-2) increased their CI and SVI into the normal range. There were no significant perioperative complications in either of these groups. Hypotensive epidural anesthesia can be used successfully in patients with low cardiac output from ventricular dysfunction undergoing total hip arthroplasty.
