Postoperative Melatonin Administration and Delirium Prevention in Patients Undergoing Vascular and Cardiac Surgery

This study has been completed.
Information provided by (Responsible Party):
University Health Network, Toronto Identifier:
First received: September 8, 2010
Last updated: February 21, 2013
Last verified: February 2013
The investigators plan to evaluate the effect of postoperative melatonin administration on postoperative delirium in patients undergoing vascular and cardiac surgery. A total of 302 patients older than 60, undergoing elective vascular surgery will be randomly divided into 2 groups: treatment and control. During the first 5 postoperative days patients will receive sublingually either melatonin 5 mg or placebo at 9:00 pm. The patients will be assessed for the signs of delirium, quality of sleep and severity of pain daily for the first postoperative week. Screening of delirium will be performed by the specially trained research assistant and based on the Confusion Assessment Method and the validated chart review. Diagnosis of delirium will be confirmed by the psychiatrist. Incidence of delirium will be compared between the groups.

Condition Intervention
Cardiac Surgery
Other: Melatonin

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Postoperative Melatonin Administration and Delirium Prevention in Patients Undergoing Vascular and Cardiac Surgery

Resource links provided by NLM:

Further study details as provided by University Health Network, Toronto:

Primary Outcome Measures:
  • Incidence of postoperative delirium [ Time Frame: preoperative assessment up to 7 days postoperatively ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Pain score, using the standard 10-cm visual analog score (0-no pain, 10-worst, unbearable pain) [ Time Frame: Preoperative assessment upt to 7 days postoperatively ] [ Designated as safety issue: No ]

Enrollment: 100
Study Start Date: August 2010
Study Completion Date: February 2013
Primary Completion Date: February 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Melatonin Other: Melatonin
Melatonin 5 mg sublingually given at 9 p.m. for 5 postoperative days or until discharge


Ages Eligible for Study:   60 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Non-emergent vascular surgery, with an expected length of stay ≥ 48hours, ASA categories I to IV, signed informed consent, age >60

Exclusion Criteria:

  • Lack of informed consent, ASA category V, history of psychiatric illness (schizophrenia, psychosis, bipolar disorder, major depression), Mini Mental State Examination score (MMSE) ≤ 24, history of autoimmune disease, liver cirrhosis, minimally invasive procedures (endovascular aneurysm repair ), history of chronic insomnia, chronic benzodiazepines and/or hypnotics use ( > 3 times /week during a month prior to surgery), treatment with tricyclic antidepressants within a month prior to surgery, history of seizures, allergy to placebo ingredients or melatonin ( WN Pharmaceuticals.LTD), melatonin consumption in the last months prior to surgery.
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Please refer to this study by its identifier: NCT01198938

Canada, Ontario
Toronto General Hospital, UHN
Toronto, Ontario, Canada, M5G 2C4
Sponsors and Collaborators
University Health Network, Toronto
Principal Investigator: Rita Katznelson, MD Toronto General Hospital, UHn
  More Information

Responsible Party: University Health Network, Toronto Identifier: NCT01198938     History of Changes
Other Study ID Numbers: UHN090334B 
Study First Received: September 8, 2010
Last Updated: February 21, 2013
Health Authority: Canada: Ethics Review Committee
Canada: Health Canada

Keywords provided by University Health Network, Toronto:
Cardiac surgery, delirium, melatonin

Additional relevant MeSH terms:
Central Nervous System Depressants
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Protective Agents processed this record on May 25, 2016