The epidemiology of falls and syncope

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Incidence of falls

Prospective studies have reported that 30% to 60% of community-dwelling older adults fall each year [6], [11], [47], [52], [62], [92], with approximately half of them experiencing multiple falls. Fall incidence rates for community-dwelling older populations range from 0.2 to 1.6 falls per person per year, with a mean of approximately 0.7 falls per year (Table 1). The incidence rises steadily after middle age and tends to be highest among individuals 80 years of age and older [10]. These

Causes of falls

Determining the major causes of falls has been an objective of many studies; however, the comparability of findings has been limited by the following factors:

  • Differences in diagnostic approaches used between studies

  • Differences in study populations

  • Differences in classification methods (e.g., single best diagnosis versus multiple diagnoses used for classifying each fall and varying importance placed on coexisting environmental hazards)

  • Variable patient recall

  • Multifactorial causality of many falls

Causes of syncope

As with falls, syncope can be caused by a multitude of different conditions, some of which are relatively benign and others potentially life threatening. A number of studies have evaluated patients carefully after a syncopal episode to determine the most likely cause. Table 4 lists those studies that included primarily elderly patients. The study populations range from outpatients evaluated in a clinic setting to patients admitted to hospital intensive care units. Consequently, the causes

Risk factors

Because a single specific cause for falling often cannot be identified and because falls are usually multifactorial in their origin, many investigators have performed epidemiologic case-control studies to identify specific risk factors, the presence of which places individuals at an increased likelihood of falling. The idea behind these studies is that, by identifying risk factors early, preventive strategies can be devised and instituted. Table 5 lists the major fall risk factors that were

Risk factors for syncope

Fewer studies have reported risk factors associated with syncope. As evidenced by the research on syncope causes, the presence of cardiac disease is undoubtedly an important underlying risk factor, as are any conditions or medications that cause orthostatic hypotension. In a prospective study of 97 nursing home residents, multivariate analysis identified five independent risk factors for syncope: coronary artery disease, functional impairment, postural hypotension, aortic stenosis, and insulin

Summary

Falls, syncope, and the associated complications are among the most serious problems that face the elderly population. The most common underlying causes and risk factors for falls include muscle weakness, gait and balance problems, visual impairment, cognitive impairment, depression, functional decline, and particular medications (especially in the presence of environmental hazards). Studies have identified the relative risks for these factors that enable a fairly accurate prediction of who is

Acknowledgements

This work was supported by the Department of Veterans Affairs, Health Services Research and Development Service project #89-101.

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