Target Audience (click to view)
This activity is designed to meet the needs of physicians.
Learning Objectives(click to view)
Upon completion of the educational activity, participants should be able to:
- Review the findings, and their implications, of a study that assessed 30-day mortality outcomes after perioperative β-blockade in patients undergoing non-cardiac surgery with different levels of cardiac risk.
Method of Participation(click to view)
Statements of credit will be awarded based on the participant reviewing monograph, correctly answer 2 out of 3 questions on the post test, completing and submitting an activity evaluation. A statement of credit will be available upon completion of an online evaluation/claimed credit form at www.akhcme.com/pwMay05. You must participate in the entire activity to receive credit. If you have questions about this CME/CE activity, please contact AKH Inc. at firstname.lastname@example.org.
Credit Available(click to view)
CME Credit Provided by AKH Inc., Advancing Knowledge in Healthcare
This activity has been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint providership of AKH Inc., Advancing Knowledge in Healthcare and Physician’s Weekly’s. AKH Inc., Advancing Knowledge in Healthcare is accredited by the ACCME to provide continuing medical education for physicians.
AKH Inc., Advancing Knowledge in Healthcare designates this enduring activity for a maximum of 0.5 AMA PRA Category 1 Credit(s)™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.
Commercial Support(click to view)
There is no commercial support for this activity.
Disclosures(click to view)
It is the policy of AKH Inc. to ensure independence, balance, objectivity, scientific rigor, and integrity in all of its continuing education activities. The author must disclose to the participants any significant relationships with commercial interests whose products or devices may be mentioned in the activity or with the commercial supporter of this continuing education activity. Identified conflicts of interest are resolved by AKH prior to accreditation of the activity and may include any of or combination of the following: attestation to non-commercial content; notification of independent and certified CME/CE expectations; referral to National Author Initiative training; restriction of topic area or content; restriction to discussion of science only; amendment of content to eliminate discussion of device or technique; use of other author for discussion of recommendations; independent review against criteria ensuring evidence support recommendation; moderator review; and peer review.
Disclosure of Unlabeled Use & Investigational Product(click to view)
This educational activity may include discussion of uses of agents that are investigational and/or unapproved by the FDA. Please refer to the official prescribing information for each product for discussion of approved indications, contraindications, and warnings.
Disclaimer(click to view)
This course is designed solely to provide the healthcare professional with information to assist in his/her practice and professional development and is not to be considered a diagnostic tool to replace professional advice or treatment. The course serves as a general guide to the healthcare professional, and therefore, cannot be considered as giving legal, nursing, medical, or other professional advice in specific cases. AKH Inc. specifically disclaim responsibility for any adverse consequences resulting directly or indirectly from information in the course, for undetected error, or through participant’s misunderstanding of the content.
Faculty & Credentials(click to view)
Discloses no financial relationships with pharmaceutical or medical product manufacturers.
Dorothy Caputo, MA, BSN, RN- CE Director of Accreditation
Discloses no financial relationships with pharmaceutical or medical product manufacturers.
AKH planners and reviewers have no relevant financial relationships to disclose.
Complete the Post Test(click to view)
While use of perioperative β-blockers is a widely accepted practice when managing patients undergoing cardiac surgery, using these medications in people who receive non-cardiac surgery is controversial. Years ago, perioperative β-blockade was recommended liberally for patients undergoing non-cardiac surgery after early research demonstrated initial success in patients with cardiac disease. However, this recommendation was based on findings from randomized clinical trials with small samples that may not have included the broad spectrum of patients seen in routine clinical practice.
“While some of the initial studies found a benefit by using β-blockade in non-cardiac surgery, other investigations have shown no advantage to this practice,” says Mark L. Friedell, MD. “In fact, some trials have indicated that patients undergoing non-cardiac surgery could be at greater risk for hypotension and stroke if they use β-blockers.” This has created considerable uncertainty about the use of perioperative β-blockers, particularly in patients at low risk of myocardial ischemic events.
Examining the Effects
Dr. Friedell and colleagues had a study published in JAMA Surgery in which they performed a retrospective observational analysis of patients undergoing surgery in Veterans Affairs (VA) hospitals over a 5-year period. Use of β-blockers was established if a dose was ordered at any time between 8 hours before surgery and 24 hours after the procedure. The authors assessed 30-day mortality outcomes after perioperative β-blockade in patients undergoing non-cardiac surgery with different levels of cardiac risk.
For the study, the authors analyzed demographics, diagnosis and procedural codes, medications, perioperative laboratory values, and dates of death. They then used a four-point cardiac risk score that was calculated by assigning one point each for renal failure, coronary artery disease, diabetes, and surgery in a major body cavity, such as the abdomen or chest. Data were collected and reviewed on more than 326,000 VA patients in the total cohort, including over 314,000 undergoing non-cardiac surgery and more than 12,000 who had cardiac surgery.
Risk Factors Matter
According to the results, the use of β-blockers lowered the 30-day mortality rate significantly in patients with three to four cardiac risk factors undergoing non-cardiac surgery. No significant mortality effect was observed among non-cardiac surgery patients with one to two cardiovascular risk factors. “Importantly, we found that β-blockade resulted in a significantly higher chance of death in patients with no risk factors undergoing non-cardiac surgery,” says Dr. Friedell (Figure).
The study team noted that they did not observe similar results in patients who underwent cardiac surgery. None of the terms in the analysis of the cardiac surgery group were significant. In addition, there were no consistent patterns of the effect of β-blocker use on mortality with regard to the number of cardiac risk factors.
Considering the Controversy
Despite years of research and many studies, the use of perioperative β-blockade in non-cardiac surgery still remains uncertain for low-risk patients. “The investigations on this particular topic have swung from positive to negative,” says Dr. Friedell. “Complicating matters is that some have contradicted one another while others have been labeled as deceitful. This is why our research is important to clinicians who are considering using β-blockers in patients undergoing non-cardiac surgery.”
Cardiology guidelines for β-blockers in the United States have been modified significantly in the past decade as more evidence continues to emerge. More recently, guidelines have recommended that β-blocker therapy should be continued in patients undergoing non-cardiac surgery who are already taking them chronically prior to their operation. “Patients undergoing non-cardiac surgery who are already taking chronic β-blockers should not stop using these medications,” Dr. Friedell says. “However, we shouldn’t routinely administer perioperative β-blockers on the day of surgery or 1 to 2 days before the procedure because this appears to increase the risk of death.”
Dr. Friedell notes that the study was not powered to determine the timing of when β-blockers were started among the participants. It was unclear whether patients were first given the β-blocker in the hospital or if it was a home medication. It also was unknown if patients were first given a β-blocker preoperatively or postoperatively during the hospitalization.
“It will be challenging to address all of the aspects of the controversy surrounding perioperative β-blocker use in non-cardiac surgery, but findings from our study illustrate the importance of not starting these drugs perioperatively in patients with no cardiovascular risk factors,” says Dr. Friedell. “On the other hand, if patients have three or four cardiovascular risk factors, then they should be considered a good candidate for β-blockers.” He adds that this latter group of patients should also be referred to cardiologists to optimize outcomes and address other heart-related issues that may arise during their care.
Readings & Resources (click to view)
Friedell ML, Van Way CW, Freyberg RW, Almenoff PL. β-Blockade and operative mortality in noncardiac surgery: harmful or helpful? JAMA Surg. 2015;150:658-664. Available at: http://archsurg.jamanetwork.com/article.aspx?articleid=2294293.
Devereaux PJ, Yang H, Yusuf S, et al; POISE Study Group. Effects of extended-release metoprolol succinate in patients undergoing non-cardiac surgery (POISE trial): a randomised controlled trial. Lancet. 2008;371:1839-1847.