Effects of different doses of remimazolam on hemodynamics during general anesthesia in patients with septic shock

The stability of hemodynamics plays a vital role in the process of anesthesia induction for patients with septic shock. As a new-type benzodiazepine, remimazolam has numerous advantages, including rapid induction, rapid recovery, stable hemodynamics, and mild respiratory depression. Nevertheless, reports about the effects of remimazolam on hemodynamics in patients with septic shock are still limited. The study aimed to evaluate the effects that different doses of remimazolam have on hemodynamics in inducing general anesthesia in patients with septic shock.

Admitted to the intensive care unit of our hospital from January 2023 to June 2023, 75 patients with septic shock caused by acute appendicitis-induced sepsis were selected as observation subjects. They were randomly assigned to receive low-dose [0.2 mg/(kg·h)], medium-dose [0.3 mg/(kg·h)], and high-dose [0.4 mg/(kg·h)] remimazolam by using a random number table, with 25 patients in each group. Their intraoperative conditions were recorded, including operation duration, intraoperative hemorrhage volume, intraoperative transfusion volume, and decannulation time. Hemodynamic parameters, including mean arterial pressure (MAP), heart rate (HR), cardiac index (CI), and stoke volume index (SVI) were collected at seven-time points (T0: before induction; T1: before intubation; T2: after intubation; T3: the start of operation; T4: 15 min after operation; T5: 30 min after operation; T6: the end of operation). We also compared hepatic and renal function indexes, including blood urea nitrogen (BUN), serum creatinine (sCr), procalcitonin (PCT), white blood cells (WBC), tumor necrosis factor-α2 (TNF-α2), and Interleukin-6 (IL-6), of the three groups of patients before operation and 1, 3, 5, 7 days after operation. In addition, the incidence of adverse reactions in the three groups was recorded and compared.

During remimazolam induction, the number of patients with intraoperative need for rescue remimazolam in the medium-dose and high-dose groups was significantly lower than in the low-dose group (p < 0.05). In terms of hemodynamic indexes, MAP in the high-dose group at T2 was lower than that at T0 (p < 0.05), and MAP at T2 was significantly lower in the high-dose group than that in the medium-dose group (p < 0.05). Furthermore, MAP at T4 in the medium-dose and high-dose groups declined compared with the low-dose group (p < 0.05). There were no significant differences in HR, CI, and SVI at different time points among the three groups (p > 0.05), but levels of HR and SVI decreased and CI increased after anesthesia compared with those before operation. Additionally, in comparison with the levels before operation, levels of sCR, BUN, PCT, WBC, TNF-α, and IL-6 were higher on postoperative days 1, 3 (p < 0.05) and lower on postoperative day 7 (p < 0.05). After the operation, both levels of BUN and sCR in the medium-dose and high-dose groups were lower than those in the low-dose group (p < 0.05).

Remimazolam is safe and effective for inducing general anesthesia in patients with septic shock. Low, medium, and high doses of remimazolam can maintain a stable hemodynamic state, and the recovery of hepatic and renal function is certain to depend on the dose.