Neal Wiggermann, Kathryn Smith, Dee- Kumpar
Background A bed that is too small to allow patients to turn from supine to side lying increases the difficulty of mobilizing patients, which can increase risk of musculoskeletal injury to caregivers, increase risk of pressure injuries to patients, and reduce patient comfort. Currently, no guidance is available for what patient sizes are accommodated by the standard 91cm (36 in.)-wide hospital bed, and no studies have evaluated the relationship between anthropometric attributes and space required to turn in bed.
Objective The purpose of this research was to determine how much space individuals occupy when turning from supine to side lying as predicted by their anthropometry (i.e., body dimensions) to establish guidance on selecting the appropriate bed size.
Methods Forty-seven adult participants (24 female) with body mass index (BMI) from 20 to 76 kg/m 2 participated in a laboratory study. Body dimensions were measured, and the envelope of space required to turn was determined using motion capture. Linear regressions estimated the relationship between anthropometric attributes and space occupied when turning.
Results BMI was strongly correlated ( R 2 = .88) with the space required to turn. Based on the linear regressions, individuals with BMI up to 35 kg/m 2 could turn left and right within 91 cm and individuals with BMI up to 45 kg/m 2 could turn one direction within 91 cm.
Discussion BMI is a good predictor of the space required to turn from supine to lateral. Nurses should consider placing patients that are unable to laterally reposition themselves on a wider bed when BMI is greater than 35 kg/m 2 and should consider placing all patients greater than 45 kg/m 2 on a wider bed regardless of mobility. Hospital administrators can use historical demographic information about the BMI of their patient populations to plan facility-level equipment procurement for equipment that accommodates their patients.
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