Effect of phenylephrine infusion and spinal anesthesia on cardiac output during cesarean section by point of care echocardiogram: A case series

2021 ◽  
Vol 75 ◽  
pp. 110474
Author(s):  
Ejaz Khan ◽  
Michael Wong ◽  
Mohamed Ibrahim ◽  
Rovnat Babazade ◽  
Michelle Simon ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Cesarean Section ◽  
Spinal Anesthesia ◽  
Point Of Care ◽  
Case Series ◽  
Phenylephrine Infusion

scholarly journals The Efficacy and Safety of Norepinephrine and Its Feasibility as a Replacement for Phenylephrine to Manage Maternal Hypotension during Elective Cesarean Delivery under Spinal Anesthesia

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Xian Wang ◽  
Xiaofeng Shen ◽  
Shijiang Liu ◽  
Jianjun Yang ◽  
Shiqin Xu
Keyword(s):  
Cardiac Output ◽  
Spinal Anesthesia ◽  
Cesarean Delivery ◽  
Adverse Outcomes ◽  
Elective Cesarean Delivery ◽  
Promising Alternative ◽  
Elective Cesarean ◽  
Phenylephrine Infusion ◽  
Infusion Of Norepinephrine ◽  
Adrenergic Effects

Maternal hypotension commonly occurs during spinal anesthesia for cesarean delivery, with a decrease of systemic vascular resistance recognized as a significant contributor. Accordingly, counteracting this effect with a vasopressor that constricts arterial vessels is appropriate, and the pure α-adrenergic receptor agonist phenylephrine is the current gold standard for treatment. However, phenylephrine is associated with dose-dependent reflex bradycardia and decreased cardiac output, which can endanger the mother and fetus in certain circumstances. In recent years, the older, traditional vasopressor norepinephrine has attracted increasing attention owing to its mild β-adrenergic effects in addition to its α-adrenergic effects. We search available literature for papers directly related to norepinephrine application in spinal anesthesia for elective cesarean delivery. Nine reports were found for norepinephrine use either alone or compared to phenylephrine. Results show that norepinephrine efficacy in rescuing maternal hypotension is similar to that of phenylephrine without obvious maternal or neonatal adverse outcomes, and with a lower incidence of bradycardia and greater cardiac output. In addition, either computer-controlled closed loop feedback infusion or manually-controlled variable-rate infusion of norepinephrine provides more precise blood pressure management than equipotent phenylephrine infusion or norepinephrine bolus. Thus, based on the limited available literature, norepinephrine appears to be a promising alternative to phenylephrine; however, before routine application begins, more favorable high-quality studies are warranted.

scholarly journals Norepinephrine versus phenylephrine infusion for preventing postspinal hypotension during cesarean section for twin pregnancy: a double-blinded randomized controlled clinical trial

2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Zijun Chen ◽  
Jieshu Zhou ◽  
Li Wan ◽  
Han Huang
Keyword(s):  
Blood Pressure ◽  
Clinical Trial ◽  
Heart Rate ◽  
Cardiac Output ◽  
Cesarean Section ◽  
Area Under The Curve ◽  
Neonatal Outcomes ◽  
The Mean ◽  
Phenylephrine Infusion ◽  
Double Blinded

Abstract Background Compared with singleton pregnancy, twin gestation is featured by a greater increase in cardiac output. Therefore, norepinephrine might be more suitable than phenylephrine for maintaining blood pressure during cesarean section for twins, as phenylephrine causes reflex bradycardia and a resultant decrease in cardiac output. This study was to determine whether norepinephrine was superior to phenylephrine in maintaining maternal hemodynamics during cesarean section for twins. Methods Informed consent was obtained from all the patients before enrollment. In this double-blinded, randomized clinical trial, 100 parturients with twin gestation undergoing cesarean section with spinal anesthesia were randomized to receive prophylactic norepinephrine (3.2 μg/min) or phenylephrine infusion (40 μg/min). The primary outcome was the change of heart rate and blood pressure during the study period. The secondary outcomes were to compare maternal complications, neonatal outcomes, Apgar scores and umbilical blood acid-base status between the two vasopressors. Results There was no significant difference observed for the change of heart rate between two vasopressors. The mean standardized area under the curve of heart rate was 78 ± 12 with norepinephrine vs. 74 ± 11 beats/min with phenylephrine (mean difference 4.4, 95%CI − 0.1 to 9.0; P = .0567). The mean standardized area under the curve of systolic blood pressure (SBP) was significantly lower in parturients with norepinephrine, as the mean of differences in standardized AUC of SBP was 6 mmHg, with a 95% CI from 2 to 9 mmHg (P = .0013). However, requirements of physician interventions for correcting maternal hemodynamical abnormalities (temporary cessation of vasopressor infusion for reactive hypertension, rescuing vasopressor bolus for hypotension and atropine for heart rate less < 50 beats/min) and neonatal outcomes were also not significantly different between two vasopressors. Conclusion Infusion of norepinephrine was not associated with less overall decrease in heart rate during cesarean section for twins, compared with phenylephrine. Trial registration Chinese Clinical Trial Registry (ChiCTR1900021281).

scholarly journals Continuous Invasive Blood Pressure and Cardiac Output Monitoring during Cesarean Delivery

2008 ◽  
Vol 109 (5) ◽  
pp. 856-863 ◽  
Author(s):  
Eldrid Langesæter ◽  
Leiv Arne Rosseland ◽  
Audun Stubhaug
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Systolic Blood Pressure ◽  
Spinal Anesthesia ◽  
Cesarean Delivery ◽  
Systemic Vascular Resistance ◽  
Vascular Resistance ◽  
Low Dose ◽  
Dose Infusion ◽  
Phenylephrine Infusion

Background Prevention of hemodynamic instability during cesarean delivery during spinal anesthesia has been the aim of several studies. Noninvasive monitoring has been used in all previous studies. This is the first study in healthy pregnant women with continuous invasive recording of arterial blood pressure, cardiac output, and systemic vascular resistance. The aim of this randomized trial was to compare the effects of two different intrathecal doses of bupivacaine, with or without intravenous phenylephrine infusion, on cardiac output and systolic blood pressure. Methods In this double-blinded study, 80 healthy women scheduled to undergo elective cesarean delivery were randomly assigned to one of four different groups receiving 7 mg spinal bupivacaine with or without a concomitant low-dose infusion of phenylephrine (0.25 microg . kg(-1) . min(-1)) or 10 mg spinal bupivacaine with or without phenylephrine infusion. All patients had 4 microg sufentanil added to the spinal solution and had cohydration with 750 ml saline, 0.9%. Results The low-dose spinal bupivacaine group with intravenous phenylephrine infusion was the most stable group regarding all hemodynamic variables. The authors found significant differences between this group and the group that was given the high dose of bupivacaine with intravenous placebo infusion regarding cardiac output (P = 0.005), systemic vascular resistance (P &lt; 0.0001), and systolic blood pressure (P = 0.012). Conclusions This study shows that low-dose bupivacaine (with sufentanil), combined with a low-dose infusion of phenylephrine and moderate cohydration, gives the best hemodynamic stability during spinal anesthesia for cesarean delivery.

Effects of Crystalloid and Colloid Preload on Blood Volume in the Parturient Undergoing Spinal Anesthesia for Elective Cesarean Section 

1999 ◽  
Vol 91 (6) ◽  
pp. 1571-1571 ◽  
Author(s):  
Hiroshi Ueyama ◽  
Yan-Ling He ◽  
Hironobu Tanigami ◽  
Takashi Mashimo ◽  
Ikuto Yoshiya
Keyword(s):  
Cardiac Output ◽  
Cesarean Section ◽  
Indocyanine Green ◽  
Spinal Anesthesia ◽  
Blood Volume ◽  
Elective Cesarean Section ◽  
Colloid Solution ◽  
Ringer’S Solution ◽  
Elective Cesarean ◽  
Lactated Ringer's Solution

Background The role of crystalloid preloading to prevent hypotension associated with spinal anesthesia in parturients during cesarean section has been challenged. Direct measurement of blood volume should provide insight regarding the volume-expanding effects. The aim of the current study was to clarify the effects of volume preload with either crystalloid or colloid solution on the changes in blood volume of parturients undergoing spinal anesthesia for cesarean section. Methods Thirty-six healthy parturients scheduled for elective cesarean section during spinal anesthesia were allocated randomly to one of three groups receiving 1.5 l lactated Ringer's solution (LR; n = 12), 0.5 l hydroxyethylstarch solution, 6% (0.5 l HES; n = 12), and 1.0 l hydroxyethylstarch solution, 6% (1.0 l HES; n = 12), respectively. Blood volume and cardiac output were measured before and after volume preloading with indocyanine green (ICG), and the indocyanine green blood concentrations were monitored by noninvasive pulse spectrophotometry. Results After volume preload, the blood volume significantly increased in all three groups (P &lt; 0.01). The volume of infused solution remaining in the vascular space in the LR, 0.5-l HES, and 1.0-l HES groups were 0.43+/-0.20 l, 0.54+/-0.14 l, and 1.03+/-0.21 l, respectively, corresponding to 28% of lactated Ringer's solution and 100% of hydroxyethylstarch solution infused. Significant increases in cardiac output were observed in the 0.5-l and 1.0-l HES groups (P &lt; 0.01). A significant correlation between the percentage increase in blood volume and that of cardiac output was observed by volume preloading (r2 = 0.838; P &lt; 0.001). The incidence of hypotension was 75% for the LR group, 58% for the 0.5-l HES group, and 17% for the 1.0-l HES group, respectively. Conclusions The incidence of hypotension developed in the 1.0-l HES group was significantly lower than that in the LR and 0.5-l HES groups, showing that greater volume expansion results in less hypotension. This result indicates that the augmentation of blood volume with preloading, regardless of the fluid used, must be large enough to result in a significant increase in cardiac output for effective prevention of hypotension.

scholarly journals A Clinical Trial on the Effects of Different Regimens of Phenylephrine on Maternal Hemodynamic After Spinal Anesthesia for Cesarean Section

2020 ◽  
Vol 10 (4) ◽  
Author(s):  
Mahshid Nikooseresht ◽  
Mohammad Ali Seifrabiei ◽  
Pouran Hajian ◽  
Shadab Khamooshi
Keyword(s):  
Blood Pressure ◽  
Clinical Trial ◽  
Cesarean Section ◽  
Spinal Anesthesia ◽  
Cesarean Delivery ◽  
Saline Control ◽  
Control Group ◽  
Significant Difference ◽  
The Mean ◽  
Phenylephrine Infusion

Background: Phenylephrine is used to prevent and treat hypotension during spinal anesthesia for cesarean delivery. Objectives: The present study aims to investigate the effects of different regimens of phenylephrine on blood pressure of candidates for the cesarean section. Methods: In this double-blind, randomized clinical trial, a total of 120 candidates of elective cesarean delivery under spinal anesthesia was randomly categorized into three groups. Groups 1, 2, and 3 received bolus and prophylactic saline (control group), prophylactic bolus phenylephrine (100 µg), and prophylactic phenylephrine infusion (50 µg/min), respectively. The incidence of hypotension, maternal hemodynamics, hypertension, rescue phenylephrine dose, nausea, and vomit were compared between the groups. Results: In all the three groups, the incidence of nausea and vomit, bradycardia, hypertension, and neonatal Apgar score were not statistically different (P > 0.05). However, the adjuvant phenylephrine dose requirement was remarkably different. Moreover, the mean systolic blood pressure differed significantly in the second and 7th minutes after the spinal block (P < 0.05). 35% in the first group, 15% in the second group, and 2.5% in the third group had hypotension (P = 0.001). Apart from the first measurement after spinal anesthesia, the mean heart rate showed no significant difference between the groups. Conclusions: The use of prophylactic phenylephrine infusion is recommended to control the optimal blood pressure in parturients undergoing cesarean section after spinal anesthesia.

scholarly journals Use of a Minimally Invasive Uncalibrated Cardiac Output Monitor in Patients Undergoing Cesarean Section under Spinal Anesthesia: Report of Four Cases

2011 ◽  
Vol 61 (5) ◽  
pp. 610-618 ◽  
Author(s):  
Fernando Bliacheriene ◽  
Maria José Carvalho Carmona ◽  
Cristina de Freitas Madeira Barretti ◽  
Cristiane Maria Federicci Haddad ◽  
Elaine Soubhi Mouchalwat ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Cesarean Section ◽  
Minimally Invasive ◽  
Spinal Anesthesia ◽  
Cardiac Output Monitor
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