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Background: Theoretically, the everolimus-eluting bioresorbable vascular scaffold (BVS) could eliminate stent thrombosis and improve outcomes in patients having percutaneous coronary intervention. Purpose: To estimate the incidence of stent thrombosis after BVS implantation and to compare the efficacy and safety of BVSs versus everolimus-eluting metallic stents (EESs) in adults having percutaneous coronary intervention. Data Sources: PubMed, EMBASE, Cochrane Central Register of Controlled Trials, conference proceedings, and relevant Web sites from inception through 20 January 2016. Study Selection: 6 randomized, controlled trials and 38 observational studies, each involving at least 40 patients with BVS implantation. Data Extraction: Two reviewers independently extracted study data and evaluated study risk of bias. Data Synthesis: The pooled incidence of definite or probable stent thrombosis after BVS implantation was 1.5 events per 100 patient-years (PYs) (95% CI, 1.2 to 2.0 events per 100 PYs) (126 events during 8508 PYs). Six randomized trials that directly compared BVSs with EESs showed a non–statistically significant increased risk for stent thrombosis (odds ratio [OR], 2.05 [CI, 0.95 to 4.43]; P = 0.067) and myocardial infarction (OR, 1.38 [CI, 0.98 to 1.95]; P = 0.064) with BVSs. The 6 observational studies that compared BVSs with EESs showed increased risk for stent thrombosis (OR, 2.32 [CI, 1.06 to 5.07]; P = 0.035) and myocardial infarction (OR, 2.09 [CI, 1.23 to 3.55]; P = 0.007) with BVSs. The relative rates of all-cause and cardiac death, revascularization, and target lesion failure were similar for BVSs and EESs. Limitation: Scarce comparative data, no published data from large trials with long-term follow-up, and limited quality and incomplete reporting of observational studies. Conclusion: Compared with EESs, BVSs do not eliminate and might increase risks for stent thrombosis and myocardial infarction in adults having percutaneous coronary intervention. Results of large trials with long-term follow-up are critically needed to establish the safety or at least the noninferiority of BVSs compared with EESs. Primary Funding Source: None.

Genomics: Prediction, Prevention, Priorities, and Punnett

Should Patients Have Periodic Health Examinations?: Grand Rounds Discussion From Beth Israel Deaconess Medical Center: Annals of Internal Medicine: Vol 164, No 3

Physicians and patients have come to expect that periodic health examinations (PHEs) are a standard part of comprehensive ongoing medical care. However, considerable research has not demonstrated a substantial benefit of the PHE. Given this lack of benefit and the high total cost of PHE to the health care system, the American Board of Internal Medicine (ABIM) Foundation and the Society of General Internal Medicine (SGIM) have identified “routine health checks in asymptomatic patients” as something of low value that physicians and patients should question, as a part of the Choosing Wisely campaign. Two discussants review the debate about PHE and consider the value of PHE for a healthy 70-year-old woman who appreciates seeing her physician annually.

The Law of Unintended Consequences

Slaves

Cardiovascular Events Associated With Use of Tyrosine Kinase Inhibitors in Chronic Myeloid Leukemia: A Population-Based Cohort Study: Annals of Internal Medicine: Vol 165, No 3

Background: Tyrosine kinase inhibitors (TKIs) have increased survival dramatically for patients with chronic myeloid leukemia (CML), but continuous administration of these drugs may elicit long-term toxicity. Objective: To investigate the incidence of vascular events in patients with CML treated with first- and second-generation TKIs. Design: Retrospective cohort study using nationwide population-based registries. Setting: Sweden. Patients: All patients diagnosed with chronic-phase CML in Sweden from 2002 to 2012 and treated with a TKI, and 5 age- and sex-matched control individuals per patient. Measurements: Relative risks, expressed as incidence rate ratios comparing patients with control individuals, were calculated. Events per 1000 person-years were assessed in interdrug comparisons. Results: 896 patients, 94.4% with documented TKI treatment, were followed for a median of 4.2 years. There were 54 arterial and 20 venous events in the CML cohort, corresponding to relative risks of 1.5 (95% CI, 1.1 to 2.1) and 2.0 (CI, 1.2 to 3.3), respectively. The event rate for myocardial infarction was higher in patients treated with nilotinib or dasatinib (29 and 19 per 1000 person-years, respectively) than in those receiving imatinib (8 per 1000 person-years), although data are limited and the CIs were wide and overlapped. Among 31 patients treated with a TKI who had myocardial infarction, 26 (84%) had at least 1 major cardiac risk factor diagnosed before the event occurred. Limitations: Patients may have been exposed to multiple TKIs. Data on second- and third-generation TKIs were limited. Conclusion: An increased risk for arterial and venous vascular events was seen in patients with CML treated with a TKI. Further study is needed to determine whether the risk for myocardial infarction increases with second-generation drugs. Primary Funding Source: No external funding.

Comparative Effectiveness of Tai Chi Versus Physical Therapy for Knee Osteoarthritis: A Randomized Trial: Annals of Internal Medicine: Vol 165, No 2

Background: Few remedies effectively treat long-term pain and disability from knee osteoarthritis. Studies suggest that Tai Chi alleviates symptoms, but no trials have directly compared Tai Chi with standard therapies for osteoarthritis. Objective: To compare Tai Chi with standard physical therapy for patients with knee osteoarthritis. Design: Randomized, 52-week, single-blind comparative effectiveness trial. (ClinicalTrials.gov: NCT01258985) Setting: An urban tertiary care academic hospital. Patients: 204 participants with symptomatic knee osteoarthritis (mean age, 60 years; 70% women; 53% white). Intervention: Tai Chi (2 times per week for 12 weeks) or standard physical therapy (2 times per week for 6 weeks, followed by 6 weeks of monitored home exercise). Measurements: The primary outcome was Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score at 12 weeks. Secondary outcomes included physical function, depression, medication use, and quality of life. Results: At 12 weeks, the WOMAC score was substantially reduced in both groups (Tai Chi, 167 points [95% CI, 145 to 190 points]; physical therapy, 143 points [CI, 119 to 167 points]). The between-group difference was not significant (24 points [CI, −10 to 58 points]). Both groups also showed similar clinically significant improvement in most secondary outcomes, and the benefits were maintained up to 52 weeks. Of note, the Tai Chi group had significantly greater improvements in depression and the physical component of quality of life. The benefit of Tai Chi was consistent across instructors. No serious adverse events occurred. Limitation: Patients were aware of their treatment group assignment, and the generalizability of the findings to other settings remains undetermined. Conclusion: Tai Chi produced beneficial effects similar to those of a standard course of physical therapy in the treatment of knee osteoarthritis. Primary Funding Source: National Center for Complementary and Integrative Health of the National Institutes of Health.

Should We Abandon Routine Visits? There Is Little Evidence for or Against

The Prevalence of Resident-to-Resident Elder Mistreatment in Nursing Homes

Background: Resident-to-resident elder mistreatment (R-REM) in nursing homes can cause physical and psychological injury and death, yet its prevalence remains unknown. Objective: To estimate the prevalence of physical, verbal, and sexual R-REM in nursing home residents and subgroups. Design: 1-month observational prevalence study. Setting: 5 urban and 5 suburban New York state nursing homes. Participants: 2011 residents in 10 facilities randomly selected on the basis of size and location; 83% of facilities and 84% of eligible residents participated. Measurements: R-REM was identified through resident interviews, staff interviews, shift coupons, observation, chart review, and accident or incident reports. Results: 407 of 2011 residents experienced at least 1 R-REM event; the total 1-month prevalence was 20.2% (95% CI, 18.1% to 22.5%). The most common forms were verbal (9.1% [CI, 7.7% to 10.8%]), other (such as invasion of privacy or menacing gestures) (5.3% [CI, 4.4% to 6.4%]), physical (5.2% [CI, 4.1% to 6.5%]), and sexual (0.6% [CI, 0.3% to 1.1%]). Several clinical and contextual factors (for example, lower vs. severe levels of cognitive impairment, residing on a dementia unit, and higher nurse aide caseload) were associated with higher estimated rates of R-REM. Limitations: Most facilities were relatively large. All R-REM cases may not have been detected; resident and staff reporting may be subject to recall bias. Conclusion: R-REM in nursing homes is highly prevalent. Verbal R-REM is most common, but physical mistreatment also occurs frequently. Because R-REM can cause injury or death, strategies are urgently needed to better understand its causes so that prevention strategies can be developed. Primary Funding Source: National Institute on Aging.

Warning Symptoms Are Associated With Survival From Sudden Cardiac Arrest

Background: Survival after sudden cardiac arrest (SCA) remains low, and tools for improved prediction of patients at long-term risk for SCA are lacking. Alternative short-term approaches aimed at preemptive risk stratification and prevention are needed. Objective: To assess characteristics of symptoms in the 4 weeks before SCA and whether response to these symptoms is associated with better outcomes. Design: Ongoing prospective population-based study. Setting: Northwestern United States (2002 to 2012). Patients: Residents aged 35 to 65 years with SCA. Measurement: Assessment of symptoms in the 4 weeks preceding SCA and association with survival to hospital discharge. Results: Of 839 patients with SCA and comprehensive assessment of symptoms (mean age, 52.6 years [SD, 8]; 75% men), 430 (51%) had warning symptoms (50% of men vs. 53% of women; P = 0.59), mainly chest pain and dyspnea. In most symptomatic patients (93%), symptoms recurred within the 24 hours preceding SCA. Only 81 patients (19%) called emergency medical services (911) to report symptoms before SCA; these persons were more likely to be patients with a history of heart disease (P < 0.001) or continuous chest pain (P < 0.001). Survival when 911 was called in response to symptoms was 32.1% (95% CI, 21.8% to 42.4%) compared with 6.0% (CI, 3.5% to 8.5%) in those who did not call (P < 0.001). Limitation: Potential for recall and response bias, symptom assessment not available in 24% of patients, and missing data for some patients and SCA characteristics. Conclusion: Warning symptoms frequently occur before SCA, but most are ignored. Emergent medical care was associated with survival in patients with symptoms, so new approaches are needed for short-term prevention of SCA. Primary Funding Source: National Heart, Lung, and Blood Institute.

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