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ObjectiveTo examine the impact of medication and medical conditions on the fall risk in older hospitalized patients.DesignMatched case-control study.SettingLarge regional hospital in a mid-sized German city.SubjectsFour hundred eighty-one inpatients aged ≥ 65 years who fell during hospitalization ("cases") and a control group of 481 controls, matched for age, gender, and hospital department.MethodsDiagnosis, medication, vital parameters, and injuries were compared between cases and controls. Univariate and multivariable odds ratios (ORs) and their corresponding 95% confidence intervals (CIs) were calculated.Main resultsSeveral drugs were significantly associated with falls in multivariate analyses: long-acting benzodiazepines (adjusted OR = 3.49; 95%-CI = 1.16-10.52), serotonin-noradrenalin reuptake inhibitors (SNRI) (2.57; 1.23-5.12), Z-drugs (2.29; 1.38-3.59), low-potency neuroleptics (1.87; 1.08-3.23), ACE inhibitors/sartans (1.42; 1.07-1.89). Digoxin (0.32; 0.11-0.99) and aldosterone receptor antagonists (0.54; 0.33-0.88) were negatively associated with falls. No significant association in multivariate analyses was found for short- and intermediate-acting benzodiazepines, mirtazapine, and opioids. Hyponatremia (1.52; 1.15-2.03) and leukocytosis (1.39; 1.05-1.87) in blood examination on admission showed significant association with falls. As secondary diagnoses, Parkinson syndrome (2.38; 1.27-4.46) and delirium (3.74; 2.26-6.21) were strongly associated with falls. The use of more than one psychoactive drug was a separate risk factor for falls (p ConclusionSeveral drugs including SNRI, neuroleptics, and Z-drugs showed a significant association with inpatient falls. The frequently prescribed tetracyclic antidepressant mirtazapine did not appear to increase the risk of falls. Psychoactive polypharmacy should be avoided.

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