Critical Illness, Muscle Weakness, Sarcopenia
Conditions
Keywords
Nutritional supplementation, Neuromuscular Electric Stimulation, ICU acquired weakness, Post ICU Syndrome, sarcopenia
Brief summary
Elderly patients who experience a prolonged ICU stay are at high risk for developing post intensive care unit syndrome (PICS), a serious medical condition manifested by loss of muscle mass, weakness, malnutrition and neurocognitive decline. PICS often leads to chronic disability, prolonged mechanical ventilation and the need for costly extended stays in long term care facilities (LTCs). The investigators' preliminary study shows attempts at rehabilitating patients who have already developed PICS are minimally effective, resulting in only modest improvements in functionality. This project will determine the effects of mobility-based physical rehabilitation (MPR) combined with neuromuscular electric stimulation (NMES) and high protein supplementation (HPRO) early in a patients ICU stay on preventing PICS related musculoskeletal and functional deficits, and improving clinical outcomes.
Detailed description
Older, critically ill patients who survive their ICU stay frequently develop post-ICU syndrome (PICS) - a condition manifested by sarcopenia, weakness, malnutrition and neurocognitive decline - which occurs as a result of a critical illness, prolonged bed rest, catabolism, and polypharmacy. PICS frequently leads to chronic disability, prolonged mechanical ventilation (MV), functional deficits, and the need for extended rehabilitation in long term care facilities (LTCs). As the majority of patients admitted to ICUs are ≥ 65 years old, many of these patients are at high risk for PICS. Since the care of ICU patients is primarily focused on the medical management of the acute critical illness, there are limited resources and strategies available to prevent PICS. Evidence suggests mobility-based physical rehabilitation (MPR) combined with resistive training with neuromuscular electric stimulation (NMES) and high protein diets (HPRO) containing essential amino acids can mitigate the loss of muscle mass and function during bed rest in the elderly. The investigators hypothesize that preventive therapy involving the addition of both NMES and HPRO to MPR early and throughout the ICU and hospital stay can mitigate PICS-associated sarcopenia, malnutrition, and immobility to confer valuable health benefits toward recovery. To test this, the investigators will use a 2x2 factorial design in which older, MV ICU patients will all receive comprehensive ICU care and MPR, then be randomized to one of 4 groups: 1) MPR+NMES, 2) MPR+HPRO, 3) all 3 together, or 4) MPR alone (control), to determine independent and combined effects of the interventions. The Specific Aims are to 1) determine the effects of adding NMES and HPRO interventions to MPR on muscle mass, strength, and mobility function in older, critically ill MV patients while still in the ICU, and 2) determine the effects of adding NMES and HPRO interventions to MPR on the clinical outcomes of time to weaning from MV, ICU/hospital length of stay and discharge disposition of these patients. This proposal capitalizes on the interdisciplinary collaboration among Pulmonary/Critical Care Intensivists, Physical Therapists, Geriatricians, Clinical Nutritionists, Statisticians and Nutrition and Metabolism clinical researchers examining the efficacy of the proposed comprehensive rehabilitation approach. The investigators' primary goal is to attenuate the severity of sarcopenia and functional decline in this older, critically ill population at risk for severe disability. Additionally, by focusing on maintaining skeletal muscle mass, function, and strength, the investigators hope to improve clinical outcomes. The investigators posit this combined therapy will mitigate PICS-associated disability and speed the recovery from critical illness in older, MV ICU patients. This project has high overall impact as the intervention is easily administered by hospital staff and may greatly reduce the physiological and functional declines while hastening recovery during acute ICU hospitalization in older adults.
Interventions
DIETARY_SUPPLEMENTMPR and High Protein Supplement (HPRO) and Neuromuscular Electric Stimulation (NMES)
The MPR provides strength and cardiopulmonary endurance training, which consist of exercises to promote function movements. Intensity is based on patient's hemodynamic responses and subjective report using Modified Borg Dyspnea Scale. Intensity, duration, or type of activity will be modified each session to achieve a moderately intense physiologic response. The NMES protocol requires self-adhesive surface electrodes be placed on quadriceps muscles and lower leg bilaterally, twice daily. This protocol is based on prior NMES protocols used to stimulate muscle protein synthesis in older diabetic patients, preserve muscle mass in intensive care patients and increase strength in older adults after knee replacement. The HPRO intervention is based on caloric needs, calculated using validated equations to maintain positive nitrogen balance. Protein will be supplemented as isolated amino acids twice/day to deliver \~15g of essential amino acids per serving, with a goal of 1.6 g/kg/day.
Sponsors
University of Maryland, Baltimore
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
45 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Age ≥ 45 years * Respiratory insufficiency requiring mechanical ventilation (MV) * ICU presentation \< 6 days * Patient or legally authorized representative able to provide written or witnessed verbal informed consent in English * All four limbs intact and mobile * Eligible for and able to participate in physical therapy * Pre admission Barthel Index \>70
Exclusion criteria
* Acute kidney injury with a glomerular filtration rate \< 30 ml/min * Diagnosis of severe organ dysfunction including end stage liver disease or cirrhosis * Diagnosis of active cancer * Acute or chronic organ transplant rejection * Exceedingly high mechanical ventilator settings (FiO2\>60%, PEEP\>12) or alternative modes of mechanical ventilation (inverse ratio pressure control, airway pressure release ventilation) * Severe functional impairment or physical impairment to rehabilitation * On high dose vasopressor agents (\> 5mcg of norepinephrine or equivalent) * Liver function tests \> 2.5 x normal limits (normal reference ranges include AST between 10 and 40 units/L or ALT between 7 and 56 units/L) * Chronic dementia or cognitive impairment
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Muscle mass | 14 days | Muscle mass as measured by lower extremity muscle volume |
| Global body strength | 14 days | Muscle group strength as measured by hand held dynamometer and by hand grip strength |
| Mobility status | 14 days | Outcome as measured by combined 6 minute walk distance and gait speed |
| Short Physical Performance Battery | 14 days | Short Physical Performance battery will be assessed at baseline and at 7 and 14 days. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Time to weaning | 14 days | As measured by ventilator days |
| ICU/Hospital length of stay | 14 days | Days in the ICU, days in the hospital |
| Discharge disposition | 30 days | home, nursing home, acute rehabilitation, readmission, death, remains hospitalized |
| Weaning success | 14 days | proportion of patient successfully weaned with in a 14 day period, and eventually |
Countries
United States
Outcome results
None listed