Haemodynamic stability with midazolam-sufentanil analgesia in cardiac surgical patients.

Since the administration of both diazepam and midazolam are claimed to cause adverse haemodynamic effects following fentanyl or sufentanil intravenous injection, we evaluated the effectiveness and safety of the reverse sequence, (midazolam-sufentanil) on haemodynamic variables, adequacy of analgesia, amnesia and recovery in 15 adult patients undergoing coronary artery surgery (with a mean +/- SEM ejection fraction of 0.41 +/- 0.03). After routine premedication, midazolam 0.14 +/- 0.01 mg.kg-1 IV was given over one min followed 5 min later by sufentanil in incremental IV doses of 1.5 micrograms.kg-1 to a total pre-intubation dose of 4.0-5.0 micrograms.kg-1 injected in 10 min. One minute after the initial dose of sufentanil, pancuronium 0.1 mg.kg-1 IV was given in 30 seconds. The incremental doses of sufentanil were based on a greater than 15 per cent increase in rate-pressure product. The mean dose of sufentanil before cardiopulmonary bypass was 9.6 +/- 2.1 micrograms.kg-1 and 13.9 +/- 1.3 micrograms.kg-1 for the entire procedure. A significant decrease in systolic and diastolic blood pressures occurred after midazolam administration which was sustained until sternotomy. A significant reduction in systemic vascular resistance occurred following midazolam. Sufentanil reduced the left ventricular stroke-work index. Tracheal intubation, skin incision and sternotomy elicited no adverse haemodynamic responses. Adequate analgesia, complete amnesia and early recovery of wakefulness were observed.