Table of Contents

March 17, 2009; 150 (6)

Articles

  • B-type natriuretic peptide (BNP) testing is commonly used to distinguish cardiac from noncardiac causes of dyspnea. In this randomized trial, BNP testing did not reduce health services utilization or improve health outcomes for dyspneic patients who visited emergency departments. Measuring BNP in all dyspneic patients to see whether heart failure is a cause of their symptoms may not be justified.

  • Life space (a measure of where a person goes, how frequently, and how independently) may more accurately measure physical function in older adults because it also reflects participation in society. Brown and colleagues found a reduction in self-reported life space in hospitalized older adults. Patients who required surgery had greater immediate declines but more rapid recovery than did those hospitalized for other reasons.

  • This post hoc analysis of data from a randomized trial suggests that the dose of aspirin used to prevent cardiovascular events does not affect efficacy or safety. However, in patients randomly assigned to clopidogrel, higher aspirin doses seemed to be associated with reduced efficacy and increased harm. Lower aspirin doses (75 to 81 mg/d) seem to optimize efficacy and safety for patients requiring aspirin for long-term prevention, especially those taking clopidogrel.

Perspectives

  • Marginalization of physicians who work in nursing homes threatens the overall care of nursing home residents with medically complex illnesses. Katz and associates propose creating a nursing home medicine specialty that recognizes the nursing home as a unique practice site. They characterize the specialty in 3 dimensions and discuss the implications for quality of care, health policy, and research needs.

Clinical Guidelines

  • An expert panel met to develop safety recommendations for prescribing methadone, which can be associated with prolongation of the QT interval and an increased risk for torsade de pointes. Panelists recommended that clinicians inform patients of arrhythmia risk when they prescribe methadone and ask about a history of heart disease. They also recommend that patients have pretreatment and follow-up electrocardiography. Possible actions if the rate-corrected QT interval is greater than 450 ms or 500 ms include discussion of the risks and benefits of methadone, more frequent monitoring, dose reduction, or stopping methadone treatment. Finally, clinicians should learn about interactions between methadone and other drugs that can prolong the QT interval or slow elimination of methadone.

  • The U.S. Preventive Services Task Force (USPSTF) recommends encouraging men age 45 to 79 years and women age 55 to 79 years to use aspirin when the potential benefit of a reduction in myocardial infarctions and ischemic strokes, respectively, outweighs the potential harm of increased risk for gastrointestinal hemorrhage (A recommendations). It discourages men and women younger than these ages from using aspirin for cardiovascular disease prevention (D recommendation). Evidence is insufficient to assess the balance of benefits and harms of aspirin use for cardiovascular disease prevention in men and women older than 79 years (I statement).

  • To support the USPSTF recommendation in this issue, Wolff and colleagues reviewed new evidence on the benefits and harms of aspirin for the primary prevention of cardiovascular disease. They conclude that aspirin reduces the risk for myocardial infarction in men and strokes in women but increases the risk for serious bleeding events, primarily gastrointestinal bleeding events.

Editorials

  • In this issue, 2 studies shed light on key questions related to aspirin use. Steinhubl and colleagues investigated the optimal dose of aspirin for prevention and treatment of cardiovascular disease, and they found that higher doses do not lead to improved efficacy and may be associated with more bleeding. The updated USPSTF recommendation on the use of aspirin for the primary prevention of coronary heart disease is an important and user-friendly document for the busy clinician.

  • An expert panel convened to discuss how to incorporate methadone's possible effect on the QT interval into clinical practice. The findings and recommendations of some of the panel members appear in this issue. They wade into controversial territory by recommending that physicians obtain electrocardiograms before treatment initiation, at 30 days, and annually thereafter in all patients receiving methadone. Before guidelines are implemented, research methods, such as decision analysis, should be applied to permit clear appreciation of the tradeoffs, benefits, and harms of alternative screening strategies.

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