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Heart Rate Variability (HRV) to Evaluate Surgical Risk on Patients on Beta Blockers

NCT01330654 · Status: WITHDRAWN · Phase: NA · Type: INTERVENTIONAL

Last updated 2012-06-27

No results posted yet for this study

Summary

Beta blockers have been shown to decrease the risk of intraoperative cardiac events in patients at high cardiac risk. However, they have also been associated with side effects (for instance, stroke.) The role of beta blockers in patients at intermediate cardiac risk undergoing surgery is controversial. Heart rate variability is a way of evaluating the cardiac function of a patient. Decreased heart rate variability is associated with early cardiac death in patients with congestive heart failure (CHF) and after a heart attack. It has been shown to transiently decrease in patients in hemorrhagic shock after trauma and returns to normal after resuscitation in trauma and burn patients. The investigators hypothesize that beta blockers will maintain pre operative heart rate variability in patients with intermediate risk of cardiac events during operative intervention with laparoscopic surgery.

Conditions

  • Cardiac Event Risk

Interventions

DRUG

metoprolol

50mg PO BID starting two weeks prior to surgery. Patients will be reevaluated one week prior to surgery. If their pulse is above 70, the dose will be increased to 100mg BID. If the HR is 50-70, the dose will not be changed. If the pulse is below 50, the dose will be decreased to 25mg. This dose will be continued for thirty days after operation.

Sponsors & Collaborators

Principal Investigators

  • Ralph Wessel, MD · UCSF Fresno Department of Internal Medicine

Study Design

Allocation
RANDOMIZED
Masking
SINGLE
Model
PARALLEL

Eligibility

Min Age
40 Years
Max Age
75 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2011-03-31
Primary Completion
2012-03-31
Completion
2012-03-31

Countries

  • United States

Study Locations

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Entities

Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01330654 on ClinicalTrials.gov