Effect of Timing on Efficacy of Morphine Analgesia After 2-chloroprocaine Anesthesia
Public ClinicalTrials.gov record NCT00487084. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
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Official title
Interaction Between Epidural 2-chloroprocaine and Epidural Morphine: Effect of Timing on Efficacy of Morphine Analgesia After 2-chloroprocaine Anesthesia
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
Epidural chloroprocaine is often used in obstetrical anesthesia because of its fast onset and short duration. These properties make it an ideal drug to use for epidural anesthesia in patients undergoing postpartum tubal ligation. When epidural morphine is given after chloroprocaine, there is a decreased efficacy of analgesia as compared to lidocaine (1). Several studies have hypothesized a specific opioid receptor mediated antagonism of chloroprocaine (2,3). Karambelkar raised the question whether this decreased efficacy is due to a disparity between the time the chloroprocaine anesthesia resolves and the onset of epidural morphine analgesia, resulting in a time window of pain (2). The duration of action of epidural 2-CP anesthesia is 30-45 minutes and the onset of epidural morphine analgesia is 60-70 minutes, therefore the regression of sensory blockade before the onset of the morphine analgesia could result in a window of pain (2). Hess and colleagues studied epidural morphine analgesia and women who had a Cesarean delivery under spinal bupivacaine anesthesia (3). Subjects were randomized to receive epidural 2-CP and morphine or epidural saline and morphine. There was no difference in postoperative analgesia between the two groups (3 and personal communication, Dr. Philip Hess). A literature search cross referencing epidural chloroprocaine, using Pub Med, did not produce any articles comparing epidural morphine given before the procedure (in an attempt to time the onset of analgesia with the resolution of chloroprocaine anesthesia) to the standard administration time after the procedure.
Study identification
- NCT ID
- NCT00487084
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Not applicable
- Enrollment
- 136 participants
Conditions and interventions
Conditions
Interventions
Drug
Eligibility (public fields only)
- Age range
- 18 Years to 60 Years
- Sex
- Female
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jul 31, 2004
- Primary completion
- Aug 31, 2008
- Completion
- Aug 31, 2008
- Last update posted
- Apr 13, 2014
2004 – 2008
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Northwestern University | Chicago | Illinois | 60611 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00487084, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 13, 2014 · Synced Sep 3, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT00487084 live on ClinicalTrials.gov.