Functional Prehabilitation and Major Elective Surgery

BACKGROUND Prehabilitation has been studied in relation outcomes after surgery. One common area studied is how it affects post-operative outcome for knee replacement patients. Prehabilitation was found to increase strength and function in older adults. {Swank, 2011. #1} Prehabilitation increased leg strength and the ability to perform functional tasks in these patients.

Prehabilitation has also been studied in patients undergoing coronary artery bypass graft surgery (CABG). Primary outcome measures were: anxiety and length of hospital stay; secondary outcome measures were: depression, physical functioning, cardiac misconceptions and cost utility. Prehabilitation was found to decrease depression and improve physical functioning. {Furze, 2009. #2}

Prehabilitation was also found in one study to reduce postoperative complications, length of stay, and declines in functional disability compared to the control group, while improving quality of life, in patients having cardiac and abdominal surgery. {Carli, 2005. #3}

No research has been done linking prehabilitation to the incidence of delirium. The research team has extensive experience studying delirium. Decreased cognition and functional ability has been linked to delirium and poorer outcomes post-operatively. {Robinson, 2009. #4}. Theoretically, by improving functional ability pre-operatively, post-operative outcomes will improve and delirium will decrease. This study will examine if this is true.

The current standard of care for abdominal and non-cardiac thoracic operations does not involve prehabilitation. (Cardiac operations were excluded due to the increased risk for heart-related complications during prehabilitation, such as Myocardial Infarction (MI).) The control group will receive standard of care pre-operative care, with the exception of baseline functional assessments.

OUTCOME MEASURES:

Primary Outcome Variable: A timed up-and-go, Mini Mental Status Exam, the de Morton Mobility Index, Modified Physical Performance Test (MPPT), and a short physical performance battery will be performed 60 days following the operation. The difference in the timed up-and-go and the short physical performance battery between 60 days postoperatively and at the initial assessment will be compared in the control and intervention groups.

Secondary Outcomes: The secondary outcome variables will be the rate of need for discharge to an institutional care facility and ICU delirium. These two variables will be compared in the control and intervention groups.

Other Outcomes: Evaluate post-operative complications. These two variables will be compared in the control and intervention groups.

STUDY DESIGN AND RESEARCH METHODS Baseline Assessment: On study entry, each participant will have a timed up-and-go, Mini Mental Status Exam, de Morton, Modified Physical Performance Test (MPPT), and a short physical performance battery performed. Routine demographics will be performed. Traditional and geriatric preoperative variables will be recorded.

Study Groups: Participants will be randomized to receive standard of care (control) or the intervention of prehabilitation.

1. Control Group: The control group will undergo routine pre-operative management.
2. Intervention Group: The intervention will consist of nine 45 minute long physical therapy sessions. Sessions will occur three times weekly at the patient's home.

Assessment of Intervention Effectiveness: Immediately prior to the operation, all participants will undergo repeat timed up-and-go, Mini Mental Status Exam, the de Morton Mobility Index, Modified Physical Performance Test (MPPT), and short physical performance battery. The difference in scores between the preoperative assessment and the initial assessment at enrollment will be compared in the control and intervention groups.

Operations: The scheduled operation will be performed.

Postoperative Adverse Outcomes: Postoperative adverse outcomes will be recorded using standardized definitions.

DATA ANALYSIS PLAN A sample size of 100 people, because we anticipate many will complete the Up and Go in 10 seconds and faster and will be screen fails. A total of 40 subjects will be randomized, 20 per group. The outcomes of timed up and go, Short Physical Battery, Modified Physical Performance Test (MPPT), and de Morton will be compared from baseline to immediately pre-operatively and immediately post-operatively.

The data will be compared as continuous variables using a non-parametric T-test. Baseline demographic clinical data will be compared in the study and control groups using non-parametric chi square or T-test where appropriate.