Osteoporosis

Risk Factors for Serious Falls Among Community-Based Seniors: Results from the National Population Health Survey

This paper examines factors associated with falling among approximately 3,100 individuals aged 65 and older who were participants in the 1994 National Population Health Survey (NPHS). The intent of the NPHS is to monitor the health of Canadians and risk factors that affect their health. Several factors were identified as increasing the risk of falling, such as advanced age, being female, certain medical conditions, medication use and impaired mobility. The results from this survey, conducted on a national level, confirm the findings of many studies utilizing smaller samples within individual communities. Continuation of the NPHS will aid in offering longitudinal data with respect to falls, and allow for establishing a temporal order prior to the fall event, in order to provide more definitive evidence with respect to risk factors for falls.

Risk factors for falling among community-based seniors using home care services

BACKGROUND

Despite the plethora of information concerning risk factors for falls, limited research efforts have focused on the issue of the differences in risk factors for falls based on fall status, or more specifically one-time versus chronic/recurrent fallers. Given that multiple falls have been found to be associated with negative outcomes, such as an increased risk of institutionalization, more research in this area is warranted.

METHODS

The purpose of this investigation was to determine the risk factors for nonfallers versus fallers (1+ falls), and for nonfallers/one-time fallers versus recurrent fallers (2+ falls). All participants (N = 2304) in this study were receiving home care services from 10 community-based agencies (Community Care Access Centres) in Ontario, Canada. The Minimum Data Set-Home Care (MDS-HC) is an assessment instrument that covers several key domains, such as service use, function, health, and social support. Nurses trained to administer the MDS-HC assessed each of the participants within their homes.

RESULTS

Of the 2304 participants in the study, 27% fell one or more times, and 10% experienced multiple falls (2+ falls). In the two final logistic regression models for risk of falling (0 falls vs 1+ falls) and multiple falling (0 falls/1 fall vs 2+ falls), the independent variables that remained significant included gender, gait, environmental hazards, and the Changes in Health, End Stage Disease and Signs and Symptoms of Medical Problems Scale. Also significant in the model for multiple falls was the Cognitive Performance Scale, Parkinson's disease, and perceived health status.

CONCLUSIONS

Overall, distinguishing individuals into different fall status classifications is important from a clinical perspective, as it is the recurrent faller who would benefit to the greatest extent from fall prevention efforts and from the negative outcomes associated with multiple falls (i.e., mortality). One of the most significant barriers in determining risk factors for falls is the lack of consistency in the variables/tools used in the research. As such, utilizing a standardized tool, such as the MDS-HC, would assist researchers in making comparisons between different settings.

Effects of oophorectomy on functional properties of resistance arteries isolated from the cancellous bone of the rabbit femur

Information is sparse concerning the effect of oophorectomy (OOX) on bone vascularization and blood flow of possible significance for altered remodeling. Whether OOX affects functional characteristics of isolated bone resistance arteries was investigated. Ring preparations (diameter approximately 250 microm) of small femoral bone arteries from oophorectomized and sham-operated rabbits were mounted on a myograph six weeks postoperatively. Cumulative concentration response curves were obtained for various agonists at a normalized lumen diameter. Oophorectomy did not significantly influence lumen diameter, maximal response to high potassium, or maximal response to high potassium and 10(-5) M noradrenaline. However, OOX significantly increased the maximal response to noradrenaline (OOX 2.14 +/- 0.36 N/m, Sham 1.25 +/- 0.14 N/m) and endothelin-1 (OOX 1.76 +/- 0.32, Sham 0.95 +/- 0.15) in metaphyseal arteries. Moreover, the corresponding maximal active pressure for the agonists was significantly increased. OOX did not influence endothelial function assessed by the effects of acetylcholine or substance P. The functional responses of diaphyseal arteries were unaffected by OOX. The study demonstrates regional differences in the effects of OOX on small arteries of importance for control of vascular resistance in bone which suggests a relation between altered vascular function after ovarian hormonal withdrawal and the changes in bone turnover associated with osteoporosis.

Estrogen replacement therapy: indications, contraindications, and agent selection

Three groups of indications exist for postmenopausal estrogen use: relief of symptoms related to estrogen deficiency, osteoporosis prophylaxis and treatment, and cardioprotection. Estrogen replacement therapy enhances a woman's sense of well-being and reduces the morbidity, mortality, and health care costs associated with osteoporosis and atherosclerotic heart disease. There are a few absolute contraindications to estrogen replacement therapy. Many estrogen preparations are currently available in the United States. Establishing equivalencies among the different preparations is complicated by the many physiologic and pharmacologic effects of estrogens and the variety of treatment end points used. Most estrogens have the same biologic effect provided equivalent blood levels are achieved. Estrogen replacement therapy has proved beneficial to selected postmenopausal women.