Use of a Shear Reduction Surface in Pre-hospital Transport

2015-10-29 14:53:21 | BioPortfolio


Does the use of an anti-shear mattress overlay placed on a pre-hospital transport stretcher reduce shear forces and pressure on the skin, and increase patient comfort as compared to standard care.


This study will enroll 30 healthy adult volunteers of any race or gender, stratified into 3 Body Mass Index (BMI) categories (≤20, 20.1-24.9, ≥25), who will serve as their own controls. The setting for this study will be on a closed driving course utilized for training of emergency and law enforcement personnel, and the vehicle used will be a standard ground ambulance affiliated with the Medical Transport of a tertiary medical center.

Inclusion criteria: Healthy adult volunteers, 18-70 years old, able to read and write English, height of 6' feet tall or less, weight under 300 lbs.

Exclusion criteria: non-English speaking, pregnancy, prisoners, previous history of pelvic fracture, pressure ulcers on sacrum, ischial tuberosity, or heel, adhesive allergy or sensitivity, height over 6 feet tall, weight over 300 lbs.

Apparatus and/or instruments: A commercial full-length LiquiCell® ASMO (Birchwood Laboratories, Eden Prairie MN) ( will be placed on the standard ambulance stretcher mattress. Shear force and tissue interface pressure will be measured during deceleration by a PREDIA device (Molten Corporation, Hiroshima Japan) through reusable sensors attached to the sacrum, ischial tuberosity, and heel.

Limitations: Since this study will be conducted using adult healthy volunteers in a ground ambulance, the findings may not be generalizable to children, those with skin at risk for pressure related injury, air medical transport, or to other types of ambulance stretchers.

Procedures: Following written informed consent, subjects will be weighed and measured with a calibrated scale to calculate a current BMI. Three PREDIA sensors will be secured to three sites (sacrum, ischial tuberosity, and heel) with double-stick tape. Subjects will wear standard hospital scrub bottoms, and be secured supine to the ambulance stretcher using standard procedure. Subjects will be blinded to the presence of the LiquiCell® ASMO overlay by a sheet covering on the stretcher. The ASMO will be placed according to a simple randomization table. The stretcher will initially be placed with 0 degree head-of-bed (HOB) elevation, followed by subsequent HOB elevations of 15 degrees and 30 degrees. HOB elevations will be verified using a standard goniometer. The ambulance will travel over a closed course driven by ambulance staff members that have passed the mandatory Coaching the Emergency Vehicle Operator (CEVO) driving course. The course will include at maximum speed of 40 mph and 5 complete stops at each of 3 HOB elevations (0, 15, and 30 degrees). Shear measurements (measured in Newtons) and pressure measurements (measured in mmHg) for each anatomical site will be taken with the PREDIA sensors during deceleration for each stop. At the completion of each set of 5 stops, subjects will be asked to rate their discomfort on a scale of 0 (no discomfort) to 10 (worst discomfort imaginable). At the completion of the course, the subject will be allowed to rest outside the ambulance for 15 minutes. Following the rest period, the course will be repeated with or without the LiquiCell® ASMO according to the randomization table.

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Crossover Assignment, Masking: Single Blind (Subject), Primary Purpose: Supportive Care


Shear Strength


Anti-shear mattress overlay, No Intervention Standard of Care


Mayo Clinic in Rochester
United States


Not yet recruiting


Mayo Clinic

Results (where available)

View Results


Published on BioPortfolio: 2015-10-29T14:53:21-0400

Clinical Trials [3316 Associated Clinical Trials listed on BioPortfolio]

Assessment of Hepatic Fibrosis by Shear Wave Elastography in Patients With Liver Malignancy: A Prospective Single-center Study

To evaluate the diagnostic performance of two-dimensional shear-wave elastography (SWE) for staging hepatic fibrosis in the background liver parenchyma in patients with liver tumors before...

Changes in the Ulnar Tissues by Shear-wave Elastography

A single-center, observational, prospective, single cohort study with before-after design. Evaluation by shear-wave elastography, measured in kilopascals (KPa), of the muscle, tendon and c...

Skin/Soft Tissue Elasticity in Head and Neck Cancer Survivors With Lymphedema and Fibrosis

This research trial studies skin/soft tissue elasticity in head and neck cancer survivors with lymphedema and fibrosis. Lymphedema and fibrosis is a common effect of head and neck cancer w...

Pressure Redistributing Overlay With Targeted Cooling Technology (PRO-TECT) for Pressure Ulcer Prevention

Objective - To demonstrate the efficacy of the pressure redistributing cooling mattress overlay compared to usual care in mitigating the progression of early pressure ulcers in critically ...

Shear and Pressure Reducing Insoles for the Diabetic Foot

We evaluated the feasibility of the GlideSoft™ novel insole to reduce pressure and shear forces on the foot. No commercially available insoles are designed to reduce shear. Although insu...

PubMed Articles [23074 Associated PubMed Articles listed on BioPortfolio]

Torsional shear strength of steel joined with high performance aerospace adhesives at cryogenic and elevated temperatures.

Pure torsional shear tests of joints glued with two different aerospace grade adhesives were performed using a specifically designed and constructed torsional shear test equipment. The developed test ...

Attenuation of Shear Waves in Normal and Steatotic Livers.

Shear wave propagation in the liver has been a robust subject of research, with shear wave speed receiving the most attention. The correlation between increased shear wave speed and increased fibrosis...

Calculation model of the equivalent spiral shear stress of conditioned sand.

Soil is the medium that balances the soil and water pressure on the excavation surface of an earth pressure balance (EPB) shield machine, and the soil flow plasticity directly affects the working perf...

Temperature Rise Associated with Adiabatic Shear Band: Causality Clarified.

One of the most important issues related to adiabatic shear failure is the correlation among temperature elevation, adiabatic shear band (ASB) formation and the loss of load capacity of the material. ...

Shear-induced damped oscillations in an epithelium depend on actomyosin contraction and E-cadherin cell adhesion.

Shear forces between cells occur during global changes in multicellular organization during morphogenesis and tissue growth, yet how cells sense shear forces and propagate a response across a tissue i...

Medical and Biotech [MESH] Definitions

The internal resistance of a material to moving some parts of it parallel to a fixed plane, in contrast to stretching (TENSILE STRENGTH) or compression (COMPRESSIVE STRENGTH). Ionic crystals are brittle because, when subjected to shear, ions of the same charge are brought next to each other, which causes repulsion.

The resistance that a gaseous or liquid system offers to flow when it is subjected to shear stress. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

The internal resistance of the BLOOD to shear forces. The in vitro measure of whole blood viscosity is of limited clinical utility because it bears little relationship to the actual viscosity within the circulation, but an increase in the viscosity of circulating blood can contribute to morbidity in patients suffering from disorders such as SICKLE CELL ANEMIA and POLYCYTHEMIA.

The minimum acceptable patient care, based on statutes, court decisions, policies, or professional guidelines.

Groups that serve as a standard for comparison in experimental studies. They are similar in relevant characteristics to the experimental group but do not receive the experimental intervention.

More From BioPortfolio on "Use of a Shear Reduction Surface in Pre-hospital Transport"

Quick Search


Relevant Topics

Wound management
Anything that breaks the skin is a wound because when the skin is broken, there's a risk of germs getting into the body and causing an infection. Follow and track Wound Care News on BioPortfolio: Wound Car...

Obstetrics and gynaecology
Fertility Menopause Obstetrics & Gynaecology Osteoporosis Women's Health Obstetrics and gynaecology comprises the care of the pregnant woman, her unborn child and the management of diseases specific to women. Most consultant...

Searches Linking to this Trial