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Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections?
Drug Des Devel Ther. 2020; 14:2789-2795.DD

Abstract

Background

There was controversy about ondansetron can reduce the incidence of spinal-induced hypotension and decrease the consumption of vasopressor in cesarean delivery with spinal anesthesia. We hypothesized that different timing of ondansetron administration may contribute to the controversy. Therefore, we aimed to determine the effect of different timing of ondansetron administration on the dose requirement of preventing phenylephrine via comparing the ED50 of prophylactic phenylephrine.

Methods

Seventy-five parturients were finally enrolled in this prospective, randomized, double-blinded dose finding study. Ondansetron or placebo was administered 5 min or 15 min before intrathecal injection. Up-down allocation method was used to determine the dose of prophylactic phenylephrine for each parturient in the three groups. The initial infusion rate of first patient was 0.5 µg/kg/min. Then, the rate for next patient was varied with increasing or decreasing of 0.05 μg/kg/min according to the response of the previous patient. An effective dose was defined as no hypotension occurred during the study period. An ineffective dose was defined as hypotension occurred during the study period. Study period in this study is from intrathecal injection to neonatal delivery. ED50 of phenylephrine infusion was calculated by probit regression.

Results

The ED50 of intravenous phenylephrine calculated by probit analysis was 0.33 (95% CI 0.20 to 0.38) µg/kg/min and 0.36 (95% CI 0.32 to 0.38) µg/kg/min in group A and B, and 0.41 (95% CI 0.37 to 0.44) µg/kg/min in group C for patients undergoing cesarean delivery with combined spinal-epidural anesthesia.

Conclusion

An earlier administration of 4 mg prophylactic ondansetron contributed no benefits for lowing the dose of prophylactic phenylephrine compared to a late administration, but can decrease the dose of preventing phenylephrine in patients undergoing cesarean delivery with combined spinal-epidural anesthesia. This finding may be useful for clinical practice and further studies.

Authors+Show Affiliations

Department of Anesthesia, Jiaxing University Affiliated Women and Children Hospital, Jiaxing, People's Republic of China.Department of Anesthesia, Jiaxing University Affiliated Women and Children Hospital, Jiaxing, People's Republic of China.Department of Obstetrics, Jiaxing University Affiliated Women and Children Hospital, Jiaxing, People's Republic of China.Department of Anesthesia, Jiaxing University Affiliated Women and Children Hospital, Jiaxing, People's Republic of China.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

32764878

Citation

Qian, Jing, et al. "Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections?" Drug Design, Development and Therapy, vol. 14, 2020, pp. 2789-2795.
Qian J, Liu L, Zheng X, et al. Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections? Drug Des Devel Ther. 2020;14:2789-2795.
Qian, J., Liu, L., Zheng, X., & Xiao, F. (2020). Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections? Drug Design, Development and Therapy, 14, 2789-2795. https://doi.org/10.2147/DDDT.S257880
Qian J, et al. Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections. Drug Des Devel Ther. 2020;14:2789-2795. PubMed PMID: 32764878.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections? AU - Qian,Jing, AU - Liu,Lin, AU - Zheng,Xiufeng, AU - Xiao,Fei, Y1 - 2020/07/16/ PY - 2020/04/12/received PY - 2020/06/23/accepted PY - 2020/8/9/entrez PY - 2020/8/9/pubmed PY - 2021/7/2/medline KW - cesarean delivery KW - hypotension KW - ondansetron KW - phenylephrine KW - spinal anesthesia SP - 2789 EP - 2795 JF - Drug design, development and therapy JO - Drug Des Devel Ther VL - 14 N2 - Background: There was controversy about ondansetron can reduce the incidence of spinal-induced hypotension and decrease the consumption of vasopressor in cesarean delivery with spinal anesthesia. We hypothesized that different timing of ondansetron administration may contribute to the controversy. Therefore, we aimed to determine the effect of different timing of ondansetron administration on the dose requirement of preventing phenylephrine via comparing the ED50 of prophylactic phenylephrine. Methods: Seventy-five parturients were finally enrolled in this prospective, randomized, double-blinded dose finding study. Ondansetron or placebo was administered 5 min or 15 min before intrathecal injection. Up-down allocation method was used to determine the dose of prophylactic phenylephrine for each parturient in the three groups. The initial infusion rate of first patient was 0.5 µg/kg/min. Then, the rate for next patient was varied with increasing or decreasing of 0.05 μg/kg/min according to the response of the previous patient. An effective dose was defined as no hypotension occurred during the study period. An ineffective dose was defined as hypotension occurred during the study period. Study period in this study is from intrathecal injection to neonatal delivery. ED50 of phenylephrine infusion was calculated by probit regression. Results: The ED50 of intravenous phenylephrine calculated by probit analysis was 0.33 (95% CI 0.20 to 0.38) µg/kg/min and 0.36 (95% CI 0.32 to 0.38) µg/kg/min in group A and B, and 0.41 (95% CI 0.37 to 0.44) µg/kg/min in group C for patients undergoing cesarean delivery with combined spinal-epidural anesthesia. Conclusion: An earlier administration of 4 mg prophylactic ondansetron contributed no benefits for lowing the dose of prophylactic phenylephrine compared to a late administration, but can decrease the dose of preventing phenylephrine in patients undergoing cesarean delivery with combined spinal-epidural anesthesia. This finding may be useful for clinical practice and further studies. SN - 1177-8881 UR - https://www.unboundmedicine.com/medline/citation/32764878/Does_an_Earlier_or_Late_Intravenous_Injection_of_Ondansetron_Affect_the_Dose_of_Phenylephrine_Needed_to_Prevent_Spinal_Anesthesia_Induced_Hypotension_in_Cesarean_Sections L2 - https://dx.doi.org/10.2147/DDDT.S257880 DB - PRIME DP - Unbound Medicine ER -