An interventional study of Spinal Anesthesia and Epidural Anesthesia in Hypotension After Neuraxial Anesthesia, Cesarean Section and Anesthesia, Obstetrical, sponsored by Bursa Yuksek Ihtisas Training and Research Hospital. Not yet recruiting at 1 site in Turkey (Türkiye). Open to female participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-20.
Sponsored by Bursa Yuksek Ihtisas Training and Research Hospital · Not applicable, Interventional, and Supportive care
The goal of this clinical trial is to compare three regional anesthesia techniques (spinal, epidural, and dural puncture epidural anesthesia) in healthy pregnant women undergoing planned (elective) cesarean delivery. The main questions it aims to answer are:
Which technique causes less low blood pressure (maternal hypotension) and requires less vasopressor medication during surgery? Which technique provides faster and more effective surgical anesthesia?
Spinal anesthesia works quickly but often causes a sudden drop in blood pressure, while epidural anesthesia is more stable but slower and sometimes incomplete. Dural puncture epidural is a newer technique that may combine the speed of spinal anesthesia with the stability of epidural anesthesia.
A total of 120 participants will be randomly assigned in equal numbers to one of the three groups. Researchers will compare the groups for blood pressure and heart rate changes, number of hypotension episodes, vasopressor use, time to reach adequate block (T6 level), block quality, need for additional pain medication, and side effects such as nausea, vomiting, and headache. Newborn well-being will be assessed with Apgar scores and umbilical cord blood gas analysis. Maternal and surgeon satisfaction will also be recorded.
Background: Spinal anesthesia is the most commonly used technique for cesarean delivery and provides a rapid, dense block; however, the sudden sympathetic blockade leads to maternal hypotension in up to 70-80% of cases, which may reduce uteroplacental blood flow and compromise the fetus. Conventional epidural anesthesia offers greater hemodynamic stability but has a slower onset and may result in patchy or inadequate block. The dural puncture epidural (DPE) technique, in which the dura is punctured with a spinal needle without intrathecal drug injection before epidural catheter placement, may facilitate translocation of epidural drugs into the intrathecal space, potentially combining a faster onset with hemodynamic stability. Existing studies show considerable methodological heterogeneity, and few trials have compared all three techniques simultaneously under a standardized protocol.
Design: This is a single-center, prospective, randomized controlled trial with three parallel arms. After written informed consent, 120 parturients scheduled for elective cesarean delivery will be randomized in a 1:1:1 ratio using a computer-generated sequence and sequentially numbered sealed envelopes on the morning of surgery to one of the following groups:
In Groups E and DPE, if bilateral T6 sensory block is not achieved within 10 minutes, 5 mL of 0.25% bupivacaine will be administered every 5 minutes up to a cumulative maximum of 30 mL. Patients who fail to achieve adequate block or require conversion to general anesthesia will be excluded from the study.
All blocks will be performed by an experienced anesthesiologist not involved in data collection. All patients will receive standardized intravenous hydration.
Measurements: Baseline values will be recorded before the neuraxial block. Non-invasive blood pressure, heart rate (ECG), and SpO2 will be recorded every 3 minutes for the first 20 minutes after completion of the block and every 5 minutes thereafter until the end of surgery. Shock index (heart rate / systolic blood pressure) and diastolic shock index (heart rate / diastolic blood pressure) will be calculated. Hypotension is defined as a decrease in mean arterial pressure of more than 20% from baseline or systolic blood pressure below 90 mmHg and will be treated with intravenous ephedrine boluses; bradycardia is defined as heart rate below 50 beats/min and will be treated with atropine. Sensory block will be assessed bilaterally with pin-prick and cold tests, and motor block with the modified Bromage scale. Neonatal outcomes will be assessed with 1- and 5-minute Apgar scores and umbilical cord blood gas analysis. Maternal satisfaction, side effects, and post-dural puncture headache will be evaluated at the postoperative 24-hour visit. Patients will also be contacted by telephone on postoperative day 3 to assess post-dural puncture headache.
Sample size: Based on an expected hypotension incidence of 65% after spinal anesthesia and 30% after epidural and DPE techniques, a sample size of 34 patients per group was calculated (effect size w = 0.33, α = 0.05, power = 80%, G*Power 3.1.9.7). Allowing for a 15% dropout rate, 40 patients per group (120 in total) will be enrolled.
Statistical analysis: Data will be analyzed using SPSS v26.0. Normality will be assessed with the Shapiro-Wilk test. Normally distributed data will be presented as mean ± standard deviation, and non-normally distributed or ordinal data as median (minimum-maximum). One-way ANOVA or Kruskal-Wallis tests will be used to compare the three groups, followed by Tukey or Dunn post-hoc tests, respectively. Chi-square or Fisher's exact tests will be used for categorical variables, and repeated measures ANOVA for time-dependent hemodynamic changes. A p value \< 0.05 will be considered statistically significant.
128 studies on the registry are indexed under Post-Dural Puncture Headache; 26 are open to participants now.
This study's planned enrollment of 120 is above the median of 80 across 85 interventional studies indexed under Post-Dural Puncture Headache.
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Exclusion Criteria:
Participants will receive spinal anesthesia with intrathecal 10 mg of 0.5% hyperbaric bupivacaine plus 10 mcg fentanyl.
Procedure: Spinal Anesthesia
Participants will receive epidural anesthesia. After epidural catheter placement and a test dose, 15-20 mL of local anesthetic solution (10 mL 0.5% isobaric bupivacaine + 50 mcg fentanyl + 5 mL 2% lidocaine + 4 mL normal saline) will be administered. If bilateral T6 sensory block is not achieved within 10 minutes, 5 mL of 0.25% bupivacaine will be given every 5 minutes up to a cumulative maximum of 30 mL.
Procedure: Epidural Anesthesia
Participants will receive dural puncture epidural anesthesia. The dura will be punctured with a 27G spinal needle without intrathecal drug injection, followed by epidural catheter placement, a test dose, and the same epidural regimen as the Epidural Anesthesia arm (15-20 mL of 10 mL 0.5% isobaric bupivacaine + 50 mcg fentanyl + 5 mL 2% lidocaine + 4 mL normal saline; additional 5 mL of 0.25% bupivacaine every 5 minutes up to 30 mL if bilateral T6 block is not achieved within 10 minutes).
Procedure: Dural Puncture Epidural Anesthesia
Single-shot intrathecal injection of 10 mg 0.5% hyperbaric bupivacaine plus 10 mcg fentanyl.
Epidural catheter placement followed by incremental administration of local anesthetic and fentanyl through the catheter.
Dural puncture with a 27G spinal needle without intrathecal drug injection, followed by epidural catheter placement and administration of local anesthetic and fentanyl through the catheter.
Incidence of Maternal Hypotension
Proportion of participants who develop at least one episode of hypotension, defined as a decrease in mean arterial pressure of more than 20% from baseline or systolic blood pressure below 90 mmHg. Baseline values are recorded before the neuraxial block. Blood pressure will be measured non-invasively every 3 minutes for the first 20 minutes after completion of the block and every 5 minutes thereafter until the end of surgery.
Time frame: From completion of the neuraxial block (time 0) until the end of surgery (approximately 90 minutes)
Number of Hypotension Episodes
Number of hypotension episodes per participant (count), using the same definition as the primary outcome.
Time frame: From completion of the neuraxial block until the end of surgery (approximately 90 minutes)
Total Ephedrine Consumption
Total dose of intravenous ephedrine administered to treat hypotension, in milligrams (mg).
Time frame: From completion of the neuraxial block until the end of surgery (approximately 90 minutes)
Shock Index
Ratio of heart rate to systolic blood pressure (unitless ratio).
Time frame: Baseline (before the block), every 3 minutes for the first 20 minutes after completion of the block, and every 5 minutes thereafter until the end of surgery (approximately 90 minutes)
Diastolic Shock Index
Ratio of heart rate to diastolic blood pressure (unitless ratio)
Time frame: Baseline (before the block), every 3 minutes for the first 20 minutes after completion of the block, and every 5 minutes thereafter until the end of surgery (approximately 90 minutes)
Time to T6 Sensory Block
Time from the end of local anesthetic injection to bilateral T6 sensory block, assessed by pin-prick and cold tests, in minutes.
Time frame: From completion of the neuraxial block until bilateral T6 sensory block is achieved
Umbilical Cord Blood pH
pH of umbilical cord blood measured by blood gas analysis (pH units).
Time frame: At delivery
Incidence of Post-Dural Puncture Headache
Proportion of participants with post-dural puncture headache, assessed in the hospital at postoperative 24 hours and by telephone on postoperative day 3.
Time frame: Postoperative 24 hours and postoperative day 3
Plan to share: No — Individual participant data will not be shared because participants did not provide consent for data sharing beyond the study team.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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