Onset of Labour Epidural Analgesia With Different Concentration Bupivacaine and Different Doses of Sufentanyl

Fudan University56 enrolled

Overview

This study aimed to compare the effects of three commonly used combination doses on the onset time and adverse reactions.

Epidural block is widely used as an analgesic method during labor. During epidural anaesthesia, lipophilic opioids such as sufentanil, are often combined with local anesthetics to prolong the duration of analgesia and improve the analgesic effect. However, dose combinations of local anesthetics and opioids, especially in the initial loading dose, vary greatly from hospital to hospital and often depend upon the different routines adopted by anesthesiologists. In clinical practice, there are still some controversy about opioid dose selection in terms of analgesic onset time and adverse reactions. In this study, three combinations of bupivacaine and sufentanil were chosen, commonly used in the clinic, and extended the observation period to 24 hours after delivery. We hypothesized that increasing the concentration of local anesthetic, rather than increasing the dose of sufentanil, would achieve a faster analgesic effect with minimal adverse effects on the mother and fetus. To test our hypothesis, our primary outcome was to compare the times of analgesia onset of the three combinations, and the secondary outcomes were to compare the effects on maternal and infant adverse reactions.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Pregnant Women Who Requested Epidural Analgesia in the Early Stage of Labor

Interventions

B1S5DRUG

Women were then placed supine with left uterine displacement. Epidural labour analgesia was initiated with 5µg sufentanyl along with 5 ml bupivacaine 0.1% as the test dose. After 3 min, 10 ml of 0.1% bupivacaine epidural was injected

B125S5DRUG

Women were then placed supine with left uterine displacement. Epidural labour analgesia was initiated with 5µg sufentanyl along with 5 ml bupivacaine 0.125% as the test dose. After 3 min, 10 ml of 0.125% bupivacaine epidural was injected

B1S10DRUG

Women were then placed supine with left uterine displacement. Epidural labour analgesia was initiated with 10µg sufentanyl along with 5 ml bupivacaine 0.1% as the test dose. After 3 min, 10 ml of 0.1% bupivacaine epidural was injected

Eligibility

Sex: FEMALEMin age: 18 YearsMax age: 50 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria:patients ASA physical status 1 or 2; early labour (cervical dilation 5 cm or less); singleton fetus; gestational age \> 36 weeks; and normal fetal heart rate (FHR) tracing. - Exclusion Criteria:severe preeclampsia;antepartum haemorrhage; ASA 3 or more; chronic pain; substance abuse;contraindications to epidural analgesia; allergies to local anaesthetics or fentanyl; body mass index (BMI) over 40; and previous administration of opioid analgesia within 24 h. \-

Locations (1)

Ethics Committee of The Obstetrics and Gynecology Hospital, Fudan University,

Shanghai, China

Outcomes

Primary Outcomes

the time to achieve effective analgesia

We defined the onset of analgesia as the time from the start of the injection to the time when the NPRS score was reduced to at least half of the original score.

Time frame: 30 min

Secondary Outcomes

Sensory block, maternal side effects (pruritus, hypotension, sedation，motor block and decreased fetal heart rate) were recorded at 5-min intervals for 30 min. sedation)

Time frame: 30min

time from the first PCA bolus, patient satisfaction, type of delivery, fever, establishment of breast feeding and LATCH score within 24 h, cumulative dosage of sufentanil/bupivacaine, time from bolus to delivery.

Time frame: delivery 24h

Data from ClinicalTrials.gov

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