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Background <p>Spinal anesthesia-induced hypotension during cesarean delivery primarily results from vasodilation. While phenylephrine restores blood pressure, it may reduce maternal cardiac output (CO) by up to 20%. Limited data exists on the cardiac effects of different fluid strategies as measured by transthoracic echocardiography (TTE), particularly when using albumin as a colloid component. This study compared the CO effects of albumin preload combined with crystalloid coload versus crystalloid coload alone.</p> Methods <p>In this randomized, double-blind study, 162 ASA II parturients scheduled for elective cesarean delivery were assigned to crystalloid coload (1000 mL Ringer’s lactate; <i>n</i> = 81) or combination therapy (250 mL albumin 5% preload plus 750 mL Ringer’s lactate coload; <i>n</i> = 81). Both groups received prophylactic phenylephrine infusion. The primary outcome was the group-by-time interaction in CO measured by TTE at baseline, 1 and 5&#xa0;min post-spinal anesthesia, post-delivery, and 1-hour post-study.</p> Results <p>The CO group-by-time interaction was not statistically significant (<i>p</i> = 0.067). In an exploratory post-hoc analysis, the overall group effect across all time points favored the combination group by 0.33&#xa0;L/min (95% CI: 0.02–0.64; <i>p</i> = 0.038). The combination group demonstrated significantly higher velocity time integral (VTI; mean difference 1.32&#xa0;cm, 95% CI: 0.87–1.77; <i>p</i> &lt; 0.0001). Vasopressor requirements, APGAR scores, and adverse events were comparable between groups. Urine output was higher in the combination group (<i>p</i> = 0.038).</p> Conclusions <p>No significant difference in temporal CO patterns was found between fluid strategies (group-by-time interaction <i>p</i> = 0.067). Despite improved VTI with combination therapy (exploratory finding), vasopressor consumption and maternal-neonatal outcomes showed no clinically meaningful differences.</p> Clinical trial registration <p>NCT06654687 (ClinicalTrials.gov, registered October 22, 2024.</p>

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Transthoracic echocardiographic evaluation of maternal cardiac output: colloid preload versus crystalloid coload during cesarean delivery under spinal anesthesia: randomized clinical trial

  • 期刊论文

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  • 发表日期：

    2026年3月12日

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  • Mohamed Ahmed Tolba,
  • Mohammed Abaalkhayl,
  • Rahaf Abdurhman Alkhuraif,
  • Afnan Fahad Alobaid,
  • Rawan Suliman Aldubayan,
  • Narjes S. Alotaibi

摘要

Background

Spinal anesthesia-induced hypotension during cesarean delivery primarily results from vasodilation. While phenylephrine restores blood pressure, it may reduce maternal cardiac output (CO) by up to 20%. Limited data exists on the cardiac effects of different fluid strategies as measured by transthoracic echocardiography (TTE), particularly when using albumin as a colloid component. This study compared the CO effects of albumin preload combined with crystalloid coload versus crystalloid coload alone.

Methods

In this randomized, double-blind study, 162 ASA II parturients scheduled for elective cesarean delivery were assigned to crystalloid coload (1000 mL Ringer’s lactate; n = 81) or combination therapy (250 mL albumin 5% preload plus 750 mL Ringer’s lactate coload; n = 81). Both groups received prophylactic phenylephrine infusion. The primary outcome was the group-by-time interaction in CO measured by TTE at baseline, 1 and 5 min post-spinal anesthesia, post-delivery, and 1-hour post-study.

Results

The CO group-by-time interaction was not statistically significant (p = 0.067). In an exploratory post-hoc analysis, the overall group effect across all time points favored the combination group by 0.33 L/min (95% CI: 0.02–0.64; p = 0.038). The combination group demonstrated significantly higher velocity time integral (VTI; mean difference 1.32 cm, 95% CI: 0.87–1.77; p < 0.0001). Vasopressor requirements, APGAR scores, and adverse events were comparable between groups. Urine output was higher in the combination group (p = 0.038).

Conclusions

No significant difference in temporal CO patterns was found between fluid strategies (group-by-time interaction p = 0.067). Despite improved VTI with combination therapy (exploratory finding), vasopressor consumption and maternal-neonatal outcomes showed no clinically meaningful differences.

Clinical trial registration

NCT06654687 (ClinicalTrials.gov, registered October 22, 2024.