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7 - Medications as risk factors for falls

Published online by Cambridge University Press:  03 May 2010

Stephen R. Lord ,
Catherine Sherrington ,
Hylton B. Menz  and
Jacqueline C. T. Close
Stephen R. Lord
Affiliation:
Prince of Wales Medical Research Institute, Sydney
Catherine Sherrington
Affiliation:
University of Sydney
Hylton B. Menz
Affiliation:
Prince of Wales Medical Research Institute, Sydney and La Trobe University, Melbourne
Jacqueline C. T. Close
Affiliation:
Prince of Wales Medical Research Institute, Sydney and Prince of Wales Hospital, Sydney
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Summary

Medications have long been implicated as an iatrogenic cause of falls and fractures, with a number of epidemiological and prospective cohort studies providing support for a link between medications and falls. This chapter will discuss the pharmacology of ageing and the potential physiological mechanisms by which medications may impact on postural stability. Specific drug classes will be highlighted where there is evidence to support a causal link between drug use and falls, and the concept of optimization of prescribing will be explored.

Drugs and ageing

Ageing is not a clearly defined single entity but more the result of a combination of anatomical, biochemical and physiological changes that occur with time. There are alterations to the physiological reserve capacity of the human body that can lead to marked haemodynamic and biochemical compromise even with the mildest of external stressor, e.g. a urinary tract infection.

The ageing process can be associated with an alteration of the body's ability to absorb, metabolize, distribute and excrete drugs (pharmacokinetics) as well as an alteration of the drug effect at its intended target site (pharmacodynamics). Changes with age are seen in body composition, with a reduction in total body water and lean body mass and a relative increase in body fat, which impact on the pharmacokinetics of a given drug. Advancing age can also be associated with an increase in the number of disease processes, which can impact on the body's ability to deal with and respond to drugs.

Type
Chapter
Information
Falls in Older People
Risk Factors and Strategies for Prevention
 , pp. 133 - 150
Publisher: Cambridge University Press
Print publication year: 2007

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