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no patients were enrolled. Study was closed prior to study start.
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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Beta blocker | Active Comparator | These patients will be randomized to receive a standard dose of metoprolol (50mg) starting two weeks prior to surgery |
|
| Control | No Intervention | This arm will receive no additional treatment prior to surgery |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| metoprolol | Drug | 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. |
| Measure | Description | Time Frame |
|---|---|---|
| Heart Rate Variability | 2 weeks |
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Inclusion Criteria:
age 40-75 years old
intermediate risk of adverse cardiac events:
renal insufficiency (CrCl < 60)
diabetes mellitus
two of the following:
undergoing an elective laparoscopic abdominal surgery less than three hours:
Exclusion Criteria:
currently taking a beta blocker
prior heart attack
rhythm other than sinus on ECG
contraindication to beta blockers:
currently taking a calcium channel blocker
urgent or emergent surgery
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| Name | Affiliation | Role |
|---|---|---|
| Ralph Wessel, MD | UCSF Fresno Department of Internal Medicine | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Community Regional Medical Center | Fresno | California | 93701 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 16754815 | Background | Fleisher LA, Beckman JA, Brown KA, Calkins H, Chaikof E, Fleischmann KE, Freeman WK, Froehlich JB, Kasper EK, Kersten JR, Riegel B, Robb JF, Smith SC Jr, Jacobs AK, Adams CD, Anderson JL, Antman EM, Faxon DP, Fuster V, Halperin JL, Hiratzka LF, Hunt SA, Lytle BW, Nishimura R, Page RL, Riegel B; American College of Cardiology/American Heart Association Task Force on Practice Guidelines Writing Committee to Update the 2002 Guidelines on Perioperative Cardiovascular Evaluation for Noncardiac Surgery; American Society of Echocardiography; American Society of Nuclear Cardiology; Heart Rhythm Society; Society of Cardiovascular Anesthesiologists; Society for Cardiovascular Angiography and Interventions; Society for Vascular Medicine and Biology. ACC/AHA 2006 guideline update on perioperative cardiovascular evaluation for noncardiac surgery: focused update on perioperative beta-blocker therapy: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Update the 2002 Guidelines on Perioperative Cardiovascular Evaluation for Noncardiac Surgery): developed in collaboration with the American Society of Echocardiography, American Society of Nuclear Cardiology, Heart Rhythm Society, Society of Cardiovascular Anesthesiologists, Society for Cardiovascular Angiography and Interventions, and Society for Vascular Medicine and Biology. Circulation. 2006 Jun 6;113(22):2662-74. doi: 10.1161/CIRCULATIONAHA.106.176009. No abstract available. |
| Label | URL |
|---|---|
| PhysioNet is a database of physiologic signals and contains information on heart rate variability | View source |
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| ID | Term |
|---|---|
| D008790 | Metoprolol |
| ID | Term |
|---|---|
| D050198 | Phenoxypropanolamines |
| D011412 | Propanolamines |
| D000605 | Amino Alcohols |
| D000438 | Alcohols |
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|
| 8737210 | Background | Heart rate variability. Standards of measurement, physiological interpretation, and clinical use. Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology. Eur Heart J. 1996 Mar;17(3):354-81. No abstract available. |
| 3812275 | Background | Kleiger RE, Miller JP, Bigger JT Jr, Moss AJ. Decreased heart rate variability and its association with increased mortality after acute myocardial infarction. Am J Cardiol. 1987 Feb 1;59(4):256-62. doi: 10.1016/0002-9149(87)90795-8. |
| 10588963 | Background | Poldermans D, Boersma E, Bax JJ, Thomson IR, van de Ven LL, Blankensteijn JD, Baars HF, Yo TI, Trocino G, Vigna C, Roelandt JR, van Urk H. The effect of bisoprolol on perioperative mortality and myocardial infarction in high-risk patients undergoing vascular surgery. Dutch Echocardiographic Cardiac Risk Evaluation Applying Stress Echocardiography Study Group. N Engl J Med. 1999 Dec 9;341(24):1789-94. doi: 10.1056/NEJM199912093412402. |
| 16700875 | Background | Beckers F, Verheyden B, Ramaekers D, Swynghedauw B, Aubert AE. Effects of autonomic blockade on non-linear cardiovascular variability indices in rats. Clin Exp Pharmacol Physiol. 2006 May-Jun;33(5-6):431-9. doi: 10.1111/j.1440-1681.2006.04384.x. |
| 17070177 | Background | Yang H, Raymer K, Butler R, Parlow J, Roberts R. The effects of perioperative beta-blockade: results of the Metoprolol after Vascular Surgery (MaVS) study, a randomized controlled trial. Am Heart J. 2006 Nov;152(5):983-90. doi: 10.1016/j.ahj.2006.07.024. |
| 18479744 | Background | POISE Study Group; Devereaux PJ, Yang H, Yusuf S, Guyatt G, Leslie K, Villar JC, Xavier D, Chrolavicius S, Greenspan L, Pogue J, Pais P, Liu L, Xu S, Malaga G, Avezum A, Chan M, Montori VM, Jacka M, Choi P. Effects of extended-release metoprolol succinate in patients undergoing non-cardiac surgery (POISE trial): a randomised controlled trial. Lancet. 2008 May 31;371(9627):1839-47. doi: 10.1016/S0140-6736(08)60601-7. Epub 2008 May 12. |
| D009930 |
| Organic Chemicals |
| D020005 | Propanols |
| D000588 | Amines |