Key result
Preemptive infusion of ephedrine compared to phenylephrine resulted in different hemodynamic parameters including SBP, DBP, CO, SV, SVR, and HR during spinal anesthesia.
Why the study?
Spinal anesthesia for cesarean section can cause significant hemodynamic changes, particularly hypotension, prompting evaluation of preemptive vasopressor infusions.
Does preemptive infusion of ephedrine compared to phenylephrine prevent hypotension and improve hemodynamic parameters in patients undergoing spinal anesthesia for cesarean section?
Does preemptive infusion of ephedrine compared to phenylephrine prevent hypotension and improve hemodynamic parameters in patients undergoing spinal anesthesia for cesarean section?
Both ephedrine and phenylephrine are effective in preventing hypotension during spinal anesthesia for cesarean section, though they produce significantly different hemodynamic profiles.
Answers are grounded in this paper and cite their sources.
Ephedrine versus phenylephrine infusions yield distinct hemodynamics during spinal anesthesia; hypothesis-generating and should not yet change practice.
Introduction/Objective. Spinal anesthesia (SA) for cesarean section may lead to significant changes in hemodynamic parameters, especially hypotension. The aim of this study was to determine and compare the efficacy and safety of preemptive infusion protocols of the two most commonly used vasopressors, ephedrine (Group E, n = 29) and phenylephrine (Group P, n = 31) not only on prevention of hypotension but also to determine their effect on hemodynamic parameters, such as stroke volume (SV) and cardiac output (CO) using a continuous non-invasive hemodynamic monitor. Methods. The infusion of ephedrine was administered at the rate of 5 mg/min. immediately after SA. Phenylephrine was administered at an infusion rate of 25 ?g/min for two minutes prior to SA. Results. In Group E, mean systolic blood pressure (SBP) and heart rate (HR) were similar to baseline. CO was higher (p < 0.001), while systemic vascular resistance (SVR) was lower than baseline (p < 0.001). In Group P, mean SBP and diastolic blood pressure (DBP) were lower than baseline, respectively (p = 0.006, p < 0.001). SBP, DBP, CO, SV, SVR, and HR were significantly different between the E and P groups (p < 0.001). Conclusion. E and P vasopressors are both effective in the prevention of hypotension during SA.
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Vukotic et al. (2020) studied Spinal anesthesia for cesarean section (n=60). Ephedrine vs. Phenylephrine (25 μg/min for two minutes prior to spinal anesthesia) was evaluated on Hemodynamic parameters (SBP, DBP, CO, SV, SVR, and HR) (p=<0.001). Preemptive infusion of ephedrine compared to phenylephrine resulted in different hemodynamic parameters including SBP, DBP, CO, SV, SVR, and HR during spinal anesthesia.
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