Mengru Wang
July 26, 2024
In this article, I will review several recently published articles and guidelines relevant to the care of older adults in primary care. The articles of interest address statins for primary prevention, vitamin D supplementation and testing, and physical activity for healthy aging.
Statins for Primary Prevention of Cardiovascular Disease
A common conundrum in primary care is whether an older adult should be on a statin for primary prevention. This question has been difficult to answer because of the underrepresentation of older adults in clinical trials that examine the effect of statins for primary prevention. A recent study by Xu et al. published in Annals of Internal Medicine sought to address this gap in knowledge, investigating the risks and benefits of statins for primary prevention for older adults.1
This study stratified participants by “old” (aged 75-84 years) and “very old” (85 years or older). In this study, older adults who had an indication for statins were initiated on statins and studied over a 5-year period and compared with age-matched cohorts not initiated on statin therapy. Participants with known cardiovascular disease at baseline were excluded. The outcomes of interest were major cardiovascular disease (CVD) (a composite of myocardial infarction, stroke, or heart failure), all-cause mortality, and adverse effect of drug therapy (myopathy or liver dysfunction).
The study found that among older adults aged 75-84, initiation of statin therapy led to a 1.2% risk reduction in major CVD over a 5-year period. For older adults aged 85 and greater, initiation of statins had an even larger impact, leading to a 4.4% risk reduction in major CVD over a 5-year period. The study found that there was no significant difference in adverse effects including myopathy or liver dysfunction in both age groups.
Statins, the study suggests, are appropriate and safe to initiate for primary prevention in older adults and can lead to substantial benefits in reduction of CVD. While time to benefit was not explicitly examined in this study, a prior study by Yourman et al. suggested that the time to benefit for statins for primary prevention in adults aged 50-75 would be least 2.5 years.2
My takeaway from these findings is to discuss statin initiation for primary prevention for older patients who are focused on longevity, have good functional status (often used in geriatrics as a proxy for prognosis), and are willing to accept more medications.
Empiric Vitamin D Supplementation in Adults Over 75 Years
Vitamin D is one of the most common supplements taken by older adults but evidence supporting vitamin D supplementation is variable in published literature, as most data comes from observational trials. New guidelines from the Endocrine Society focused on developing recommendations for healthy individuals with data obtained from randomized controlled trials (RCTs) and large longitudinal observational trials with comparison groups if RCTs were not available. These guidelines recommend against empiric supplementation of vitamin D for healthy adults aged 18-74, excluding pregnant women and patients with high-risk diabetes.3
For older adults aged 75 or greater, empiric vitamin D supplementation is recommended because of the possible reduction of risk in all-cause mortality in this population. Of note, this was a grade 2 recommendation by the panel, indicating that the benefits of the treatment probably outweigh the risks. The panel stated that vitamin D supplementation could be delivered through fortified foods, multivitamins with vitamin D, or as a separate vitamin D supplement.
The dosage should remain within the recommended daily allowance outlined by the Institute of Medicine of 800 IU daily for adults over 70, and the panel recommends low-dose daily vitamin D supplementation over high-dose interval supplementation. The panel noted that routine screening of vitamin D levels should not be used to guide decision-making on whether to start supplementation, but vitamin D levels should be obtained for patients who have an indication for evaluation.
The reviewers highlight that these guidelines were developed for healthy individuals and are not applicable to those with conditions that warrant vitamin D evaluation. In my clinical practice, many of my patients have bone-mineral conditions and cognitive impairment that warrant evaluation. Based on these guidelines, I will consider empiric vitamin D supplementation more often for healthy patients aged 75 and older.
Sedentary Behaviors and Healthy Aging
Engaging inactive older adults in regular physical activity can be challenging, particularly as the pandemic has led to more pervasive social isolation and affected the availability of in-person exercise activities in the community. Physical activity is a key component of healthy aging and cognition, and its benefits should be a part of routine counseling for older adults.
An interesting recent study published in JAMA Network Open by Shi et al. evaluated the association of health behaviors and aging in female US nurses over a 20-year period.4 Surveys were administered to capture time spent in each behavior, such as being sedentary (TV watching, sitting at home or at work), light activity (walking around the house or at work), and moderate to vigorous activity (walking for exercise, lawn mowing). “Healthy aging” was defined by the absence of chronic conditions such as heart failure, and lack of physical, mental, and cognitive impairment.
The study found that participants who were more sedentary were less likely to age healthfully, with each additional 2 hours of TV watching per day associated with a 12% reduction in likelihood of healthy aging. Light physical activity was associated with a significant increase in healthy aging, with a 6% increase in the likelihood of healthy aging for each additional 2 hours of light activity. Each additional 1 hour of moderate to vigorous activity was associated with a 14% increase in the likelihood of healthy aging. These findings support discussions with patients that behavior change, even in small increments, can be beneficial in healthy aging.
This article originally appeared on MDedge.com, part of the Medscape Professional Network.
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