In this study, CF was regarded as an adverse health outcome of older adults in the community, and the relationship between PIMs and CF in older adults in the community was explored. In addition, by controlling for confounding factors, the contribution of depression factors to the effect of PIMs on CF was explored.
A cross-sectional retrospective study of 1,853 older adults who regularly visited the ambulatory care setting for PIMs screening showed that almost one out of two individuals used PIMs[32]. Our study is similar to previous studies, and the results show that PIMs is a significant factor causing CF, and the average number of PIMs is 2 or more. Our study also revealed that the three most common PIMs were clopidogrel (89 patients), EZ (76 patients), and spironolactone (45 patients). Because of poor physical function, older adults with CF often suffer from a variety of chronic diseases and receive a variety of drugs. Most older adults with cardiovascular and cerebrovascular diseases and sleep disorders often use these two drugs or a combination of drugs for treatment, but these drugs also increase the occurrence of muscle loss, falls, depression and other adverse drug reactions, further aggravating cognitive frailty. At the same time, there are different degrees of cognitive function decline, which makes it more common for patients to mistake, miss, or overdose drugs. In addition, in the primary medical care environment, medical staff do not pay enough attention to PIMs or take effective management measures.
Due to decreases in the plasma levels of transforming growth factor and brain-derived neurotrophic factor and hippocampal atrophy, the cognitive function of people with depression is significantly decreased[33]. In addition, an increase in depression will seriously change the lifestyle habits of elderly people, resulting in a decrease in social activities and a corresponding lack of physical exercise, aggravating physical weakness. The results of this study are similar to those of previous studies[34], and depression can significantly aggravate CF. The mediation model test revealed that depression played an incomplete mediating role between PIMs and CF. Due to the long-term increase in depression in this population, a series of symptoms or diseases may develop, increasing medical behaviour and drug use, and the hospital lacks effective drug supervision, thereby increasing PIMs exposure and CF. Therefore, community health care workers should pay attention to the emotional changes of older adults with CF and strengthen health education for their families so that they can develop correct disease cognition and identify signs of depression to help older adults improve negative emotions, increase medical cooperation, promote social participation, and delay the progression of CF.
After controlling for SPPB, social network, MoCA-B, and BI scores, the predictive effect of PIMs on CF was moderated by depressive status. As the level of depression in older adults increased, the degree of influence of PIM on CFs gradually decreased. This may be because when older adults initially have cognitive or physical function decline, they tend to participate less in social activities and are reluctant to socialize and lack corresponding physical exercise. These factors can easily cause older adults to be relatively lonely, accompanied by various negative emotions, such as silence, indifference, and depression. Therefore, as the severity of depression continues to increase, older adults exhibit reduced activity, decreased ability to live daily, and decreased cognitive function, which leads to the development of corresponding diseases and increased PIMs use. In addition, this study revealed that when depression scores were above 8, that is, when older adults had moderate or severe depression, the effect of PIMs on CF disappeared. The more depressed an older adult is, the worse his or her cognitive and physical function will be. Older adults at this stage may not be exposed to PIM because of depression but because of a range of clinical syndromes caused by various disease factors. Therefore, it is necessary to increase the sample size in the future to continue to explore the moderating effect of different levels of depression on the role of PIMs in CF.
Community health workers should also focus on elderly people who live alone, are widowed, have low income status, have low participation in social activities, and have poor physical functioning. This population should be encouraged to actively participate in physical exercise, such as aerobic exercise and progressive resistance training[35], and carry out various forms of social activities, such as playing traditional music, musical instruments, singing nostalgic songs and dancing[36], to increase the social participation of older adults and reduce the incidence of depression and other negative emotions. For older adults with severe depression, community medical workers should improve the management of health records, strengthen disease monitoring, and use relaxation therapy[37], mindfulness-based stress reduction[38] and other means to reduce depression. Finally, due to the high rate of PIMs use among elderly people with CF and its significant harmfulness, community health care workers should undergo drug screening as the key component of CF management and regular follow-up to detect adverse drug reactions. At the same time, we should perform good chronic disease archive management and choose nondrug intervention methods for chronic diseases that can be prevented and controlled.
Limitations
The limitations of this study include that the survey was only conducted in a city in China, which limits the representativeness of the sample and the generalizability of our findings. This was a cross-sectional design that limited the understanding of directional relationships; thus, future longitudinal prospective research is needed. In addition, the 15-item Geriatric Depression Scale (GDS-15) was used to screen for depressive symptoms, not to diagnose depression. Finally, this may be due to the limited sample size. Our study concluded that there was no moderating effect when depression levels were high.