To observe and identify determinants of recovery from intensive care unit-acquired weakness (ICUAW) following a severe cardiorespiratory failure requiring extra-corporeal membrane oxygenation (ECMO). Additionally, to discover the effects of ICUAW on physical function and health-related quality of life (HRQoL) after critical illness. CLEVERER is a clinical observational pilot study.
To identify determinants of recovery from ICUAW and to discover the effects of ICUAW on physical function and health-related quality of life (HRQoL) after critical illness. This phenomenon has become more evident over recent years and still requires extensive research. ICUAW is an umbrella term for more specifically polyneuropathy and myopathy. Recent research has found that 50% of patients undergoing elective cardiac surgery lose significant muscle mass (9.6% in the wasters group) within the first seven days. These patients are receiving relatively uncomplicated surgery yet still suffering from muscle breakdown, which cannot be described by inactivity alone. The investigators wish to observe ICUAW in a real-life context, however, where cases are always severe. ICUAW can lead to a significant increase in mortality and morbidity. Risk factors for ICUAW include neuromuscular blocking agents, hyperglycaemia, inactivity and sepsis. The correlation between a patient group with severe cardiorespiratory failure and patient-centred outcomes during recovery such as functional ability and health-related quality of life (HRQoL) has been little studied. Severe cardiac and respiratory failure can both be supported by a mechanical cardio-respiratory support (MCS) including extra-corporeal membrane oxygenation (ECMO); therefore referral for this intervention can be used as a marker of the severest form of cardiorespiratory failure. Both conditions are associated with a high incidence of collateral multi-organ dysfunction and mortality; as well as long-term morbidity, loss of independence and reduced quality of life. Patients with acute cardiac and respiratory failure referred to St Bartholomew's hospital for consideration of MCS will be recruited by advice/guidance from a personal and professional consultee. Rectus femoris cross-sectional area (RFcsa) will be measured by ultrasound during the first week of admission and at pre-determined time points. The RFcsa will be correlated with indices of muscle strength, physical function and HRQoL. The investigators will also take blood and urine samples on arrival and at pre-defined intervals during the patients' admission for circulating and respiratory markers of sepsis, oxidative stress and organ injury. A muscle biopsy will be taken from the operation field if the patient is centrally cannulated when initiating ECMO. The primary Objective is to identify determinants of recovery from ICUAW and to discover the effects of ICUAW on physical function and health-related quality of life (HRQoL) after severe cardiorespiratory failure. Specifically, to observe the cross-sectional area of the Rectus Femoris (RFcsa) and correlate this with muscle strength and HRQoL during recovery. RFcsa, hand-held dynamometry, knee straightening dynamometry, Free Fat Mass Index, standing and lying vital capacity, MRC-SS sum score and short physical performance battery (SPPB) will be observed. Also, HRQoL will be measured using the reintegration to normal living index (RNLI), hospital and anxiety depression score (HADS)and the EQ-5D-5L (EuroQol research foundation). Additionally, we have composed a 10 item questionnaire to assess pre-morbid functional status. The primary endpoint will be once all these data are gathered and analysed. The secondary aim is to understand the molecular and genomic profile of blood samples and the histology of the muscle biopsies. The objective will be supported with additional data from urine analysis (albumin-creatinine ratio) and vascular endothelial cells. The secondary endpoint will be once these data are collected and analysed.
Study Type
OBSERVATIONAL
Enrollment
100
St Bartholomew's hospital (Barts NHS trust)
London, United Kingdom
RECRUITINGTo observe the change in cross sectional area of the Rectus Femoris (RFcsa, measured in cm2) during critical illness and recovery.
RFcsa will be calculated using B-mode ultrasound (US) at pre-determined time points. Additionally, the images acquired will have histogram analysis in adobe photoshop software. The RFcsa will be correlated with indices of muscle strength and HRQoL. A larger RFcsa with reduced pixel density suggests greater muscle quality and function.
Time frame: Up to approximately 1 year.
To Observe a change in Hand Held Dynamometry strength and correlate this with RFcsa, function and HRQoL during critical illness and recovery.
Hand-held dynamometry will be calculated using the JAMAR hand-held hydraulic dynamometer. We will assess both hands and take the mean of 3 trials, producing a maximal grip result. A higher score indicates better global strength and function.
Time frame: Up to approximately 1 year.
To observe a change in Knee straightening dynamometry, strength and joint moment (torque) and correlate this with RFcsa, function and HRQoL during critical illness and recovery.
The test will be conducted using a Lafayette Manual Muscle Tester. Joint knee moment (torque) and strength will be measured. A higher result from joint knee moment and strength indicates a greater global strength and function.
Time frame: Up to approximately 1 year
To test the Medical Research Council Sum Score (MRC-SS). MRC-SS measures global strength and ambulation
This test will be conducted once to reaffirm whether patients' have ICUAW. A score can range from 0 (paralysis) to 60 (normal strength). A score of less than 48 indicates the patient has ICUAW. Therefore, a lower score is associated with worse outcomes.
Time frame: Up to approximately 1 year.
To observe a change in Short Physical Performance Battery (SPPB) and correlate this with RFcsa, function and HRQoL during critical illness and recovery
SPPB will be used as a further marker of functional status. The patient can score between 0 (poor functional status) and 12 (good functional status).
Time frame: Up to approximately 1 year.
Lying and Standing Vital Capacity (FVC - forced vital capacity) and correlate this with RFcsa, function and HRQoL during critical illness and recovery.
Lying and standing vital capacity will be measured using a hand held spirometer. The test score will be compared to the predicted normal value based on age, height, race and gender. A result is considered normal if it is 80 percent or more of the predicted value.
Time frame: Up to approximately 1 year
To measure a change in Free Fat Mass Index (FFMI) and correlate this with RFcsa, function and HRQoL during critical illness and recovery.
Free fat mass index (FFMI) and free fat mass (FFM) will be measured using the bodystat 1500 device. Other values will also be recorded from the test including body fat percentage and lean mass percentage. The body stat 1500 is an electrical device that uses electrical impedance to obtain results (objective data). Results will be compared to predicted values based on age, sex, height and weight.
Time frame: Up to approximately 1 year
To measure the EQ-5D-5L (Euroscore) to assess general health and correlate this with the primary objective (RFcsa).
EQ5D-5L is a standardised tool that provides a simple generic measure of health. A summation of all the levels will be converted to a single index value using the EQ5D-5L crosswalk index value calculator. The general health score can range from 0 (worst health imaginable) to 100 (best health imaginable). Additionally, a health state ranging from level 1 (indicating no problem) to level 5 (indicating extreme problems) can be calculated using the descriptive system and its five dimensions.
Time frame: Up to approximately 1 year
Hospital anxiety and depression score (HADS) to assess HRQoL and correlate this with the overall primary objective (RFcsa).
The HADS is an assessment that measures whether a patient is suffering from anxiety or depression. HADS is a self assessment consisting of 16 items. A result between 0 and 7 indicates a normal case, between 8 and 10 indicates borderline abnormal and between 11 and 21 indicates abnormal levels of anxiety and depression.
Time frame: Up to approximately 1 year
Reintegration to normal living index (RNLI) to assess HRQoL and correlate this with the overall primary objective (RFcsa).
The RNLI is a 5 domain 11-tool item aimed at assessing the degree to which patients' who have experienced traumatic and incapacitating illness achieve reintegration into society. The RNLI score is based out of 110, which will be proportionally converted to create a score of 100. Zero indicates no integration whereas 100 implies full integration.
Time frame: Up to approximately 1 year
10-item questionnaire to assess HRQoL (pre-morbid functional status) and correlate this with the overall primary objective.
This is a locally devised questionnaire that is answered by the patients' next of kin due to them being incapacitated. We will correlate these results with the other HRQoL questionnaires.
Time frame: Day 0 (on admission)
The secondary aim is to understand the molecular profile (bloods).
Blood analysis will contain and analyse but not limited to markers of oxidative stress injury, inflammation, MiRNA and injury to multiple organs will be quantified. We will collect, store and analyse buffy coat and plasma to understand these profiles.
Time frame: Up to approximately 1 year
Urine Analysis
Urine analysis measures albumin-creatinine ratio (ACR).
Time frame: Up to approximately 1 year
Muscle Biopsy
A muscle biopsy will be taken from patients whilst under anaesthesia. The biopsy observes pathways relevant to muscle homeostasis using biochemical and molecular techniques.
Time frame: Intra operatively
Vascular endothelial cell sampling
Cell samples will be acquired from insertion of the central line.
Time frame: Day 0.
Cardiac post operative morbidity score (C-POMS) will be used to calculate total morbidity risk.
C-POMS is additional data that will be collected and analysed. C-POMS is a validated tool assessing in-hospital morbidity burden (score 0-13) derived by noting the presence of 13 morbidity domains (pulmonary, infectious, renal, gastrointestinal, cardiovascular, neurological, haematological, wounds, pain, endocrine, electrolytes, review and assisted ambulation) on days 3, 5, 8 and 15 after cardiac surgery. A higher score indicates a greater morbidity burden. Although ECMO is not considered cardiac surgery we can still utilise C-POMS as a descriptive measure.
Time frame: Time Frame: Day 3, day 5, day 8 and day 15 post ECMO initiation.
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