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A Dose Ranging Effect of Preoperative Diphenhydramine on Postoperative Quality of Recovery After Ambulatory Surgery

This study has been completed.
Information provided by (Responsible Party):
Gildasio De Oliveira, Northwestern University Identifier:
First received: September 20, 2011
Last updated: February 14, 2014
Last verified: February 2014

Pain after ambulatory surgery remains an unsolved problem in The United States and Europe. It is associated with delayed hospital discharge and it can result to an increased opioid consumption with adverse side effects. The concept of multimodal analgesic technique was introduced more than 15 years ago and several techniques have been studied over the years including non steroidal antiinflammatory drugs (NSAIDs), acetaminophen, gabapentoids, ketamine, local and regional anesthetic techniques. Histamine can have effects on polymodal nociceptors and C-fibers, producing pain which is further increased by neurogenically mediated release of substance P from afferent pain fibers. Several non-selective or H1 -selective histamine receptors antagonists have been demonstrated in animal models and clinical pain. Chia et al demonstrated that preoperative promethazine had opioid sparing properties without adverse sedative effects in patients undergoing abdominal hysterectomy.

Diphenhydramine is an anti-histamine drug who has been found to be effective in reducing postoperative nausea and vomiting after ambulatory surgery but its effects on postoperative pain and other important outcomes after ambulatory surgery such as time to meet discharge criteria have not being studied.

The MQOR 40 is a validated instrument that was specifically design to evaluate patient recovery after anesthesia and surgery. This instrument can be particularly valid to examine interventions which affect different spheres of patient recovery as is the case of diphenhydramine. The objective of this study is to determine a dose response effect of preoperative diphenhydramine on postoperative quality of recovery after ambulatory surgery. The use of preoperative diphenhydramine can improve patient's quality of recovery, decrease postoperative pain, opioid consumption and opioid related side effects after ambulatory surgery.

The research question: Does a preoperative dose of diphenhydramine improve postoperative quality of recovery after ambulatory surgery? The hypothesis of this study is that preoperative diphenhydramine will improve postoperative pain, Postoperative nausea and vomiting (PONV), sleep which will translate in a better overall quality of recovery.

Condition Intervention
Drug: .9 normal saline
Drug: 25 mg diphenhydramine IV
Drug: 50 mg diphenhydramine IV

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: A Dose Ranging Effect of Preoperative Diphenhydramine on Postoperative Quality of Recovery After Ambulatory Surgery

Resource links provided by NLM:

Further study details as provided by Gildasio De Oliveira, Northwestern University:

Primary Outcome Measures:
  • Quality of Recovery 40 at 24 Hours [ Time Frame: 24 hours post operatively ]
    Scores on QOR (quality of recovery) 40 questionnaire.The QoR-40 score, which ranges from 40 to 200, representing very poor to outstanding quality of recovery, respectively.

Enrollment: 90
Study Start Date: September 2011
Study Completion Date: September 2012
Primary Completion Date: September 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: Placebo
.9 normal saline IV
Drug: .9 normal saline
.9 normal saline administered before surgery.
Active Comparator: 25 mg diphenhydramine IV
25 mg diphenhydramine IV administered before surgery
Drug: 25 mg diphenhydramine IV
25 mg diphenhydramine IV administered before surgery
Active Comparator: 50 mg diphenhydramine IV
50 mg diphenhydramine IV administered before surgery
Drug: 50 mg diphenhydramine IV
50 mg diphenhydramine administered IV before surgery


Ages Eligible for Study:   18 Years to 64 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Age 18-64 years
  • Patients undergoing ambulatory surgery
  • ASA PS I, II.

Exclusion Criteria:

  • Chronic opioid use
  • pregnant patient or lactating patients
  • allergy to diphenhydramine
  • glaucoma
  • uncontrolled hypertension
  • asthma
  • hyperthyroidism
  • cardiovascular disease
  Contacts and Locations
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Please refer to this study by its identifier: NCT01451762

United States, Illinois
Prentice Womens HOspital
Chicago, Illinois, United States, 60611
Prentice Womens HOsptial
Chicago, Illinois, United States, 60611
Sponsors and Collaborators
Northwestern University
Principal Investigator: Gildasio De Oliveira, MD Northwestern University
  More Information

Responsible Party: Gildasio De Oliveira, Gildasio De Oliveira, M.D. Principal Investigator, Northwestern University Identifier: NCT01451762     History of Changes
Other Study ID Numbers: STU00044695
Study First Received: September 20, 2011
Results First Received: October 28, 2013
Last Updated: February 14, 2014

Keywords provided by Gildasio De Oliveira, Northwestern University:

Additional relevant MeSH terms:
Anesthetics, Local
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Autonomic Agents
Gastrointestinal Agents
Histamine H1 Antagonists
Histamine Antagonists
Histamine Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Hypnotics and Sedatives
Anti-Allergic Agents
Dermatologic Agents processed this record on May 25, 2017