Critical Illness Myopathy as a Cause of Debilitating ICU-Acquired Weakness
| Status: | Active, not recruiting |
|---|---|
| Conditions: | Cognitive Studies, Hospital, Neurology |
| Therapuetic Areas: | Neurology, Psychiatry / Psychology, Other |
| Healthy: | No |
| Age Range: | 18 - 99 |
| Updated: | 4/17/2018 |
| Start Date: | November 2008 |
| End Date: | December 2020 |
Investigating the Histopathological and Clinical Significance of Critical Illness Myopathy as a Cause of Debilitating ICU-Acquired Weakness
ICU-acquired weakness represents a common and often devastating disease process which affects
greater than 50% of critically ill patients. This pathogenesis of this acquired disease is
multifactorial and results in variable severity, ranging from mild, transient to severe,
permanent dysfunction of peripheral nerves in additional to muscle. In affected patients,
weakness may persist for months to years after the acute phase of their illness, and has been
implicated as a major contributor to decreased functional status and quality of life. Muscle
ultrasound has been validated for assessment of muscle size as well as diagnosis of myopathic
and neuropathic changes in patients with other known neuromuscular diseases. The use of
muscle ultrasound or other imaging modalities for diagnosis or monitoring of ICU-acquired
weakness has not been studied, although a single study using muscle ultrasound has shown
significant change in muscle size in ICU patients receiving high dose corticosteroids and a
prolonged course of paralytic agents. The investigators plan to use multiple modalities to
examine skeletal muscle catabolism, function, and structure in patients during critical
illness and recovery. The investigators will combine physical exam, hand grip dynamometry,
electrophysiologic studies, serum biomarkers, muscle biopsies, and muscle ultrasound to
assess a group of critically ill patients during their hospital stay. The investigators will
obtain additional data, including neuropsychiatric assessments, severity of illness scores,
administration of potentially harmful medications, and pertinent daily laboratory data. This
study will last approximately 12 months.
greater than 50% of critically ill patients. This pathogenesis of this acquired disease is
multifactorial and results in variable severity, ranging from mild, transient to severe,
permanent dysfunction of peripheral nerves in additional to muscle. In affected patients,
weakness may persist for months to years after the acute phase of their illness, and has been
implicated as a major contributor to decreased functional status and quality of life. Muscle
ultrasound has been validated for assessment of muscle size as well as diagnosis of myopathic
and neuropathic changes in patients with other known neuromuscular diseases. The use of
muscle ultrasound or other imaging modalities for diagnosis or monitoring of ICU-acquired
weakness has not been studied, although a single study using muscle ultrasound has shown
significant change in muscle size in ICU patients receiving high dose corticosteroids and a
prolonged course of paralytic agents. The investigators plan to use multiple modalities to
examine skeletal muscle catabolism, function, and structure in patients during critical
illness and recovery. The investigators will combine physical exam, hand grip dynamometry,
electrophysiologic studies, serum biomarkers, muscle biopsies, and muscle ultrasound to
assess a group of critically ill patients during their hospital stay. The investigators will
obtain additional data, including neuropsychiatric assessments, severity of illness scores,
administration of potentially harmful medications, and pertinent daily laboratory data. This
study will last approximately 12 months.
Inclusion Criteria:
1. Patients will be included if they are adult, patients in a medical and/or surgical ICU
receiving treatment for any of the following:
- respiratory failure, or
- cardiogenic or septic shock.
Exclusion Criteria:
1. Cumulative ICU time > 5 days in the past 30 days, not including the current ICU stay,
as this might create a state of flux regarding patients' cognitive baseline.
2. Severe cognitive or neurodegenerative diseases that prevent a patient from living
independently at baseline, including mental illness requiring institutionalization,
acquired or congenital mental retardation, known brain lesions, traumatic brain
injury, cerebrovascular accidents with resultant moderate to severe cognitive deficits
or ADL dependency, Parkinson's disease, Huntington's disease, severe Alzheimer's
disease or dementia of any etiology.
3. ICU admission post cardiopulmonary resuscitation with suspected anoxic injury.
4. An active substance abuse or psychotic disorder, or a recent (within the past 6
months) serious suicidal gesture necessitating hospitalization. This exclusion will
enrich follow-up rates by avoiding patients with whom it is particularly challenging
to maintain long-term contact.
5. Blind, deaf, or unable to speak English, as these conditions would preclude our
ability to perform the follow-up evaluation interviews.
6. Overly moribund and not expected to survive for an additional 24 hours and / or
withdrawing life support to focus on comfort measures only.
7. Prisoners.
8. Patients who live further than 200 miles from Nashville and who do not regularly visit
the Nashville area.
9. Patients who are homeless and have no secondary contact person available. This
exclusion will enrich follow-up rates by avoiding patients with whom it is
particularly challenging to maintain long-term contact.
10. The onset of the current episode of respiratory failure, cardiogenic shock, or septic
shock was > 72 hours ago.
11. Patients who have had cardiac bypass surgery within the past 3 months (including the
current hospitalization).
12. Patients with known Neuromuscular disease prior to admission.
13. BMI > 40 or patient size that will not make percutaneous muscle biopsy and muscle
ultrasound possible.
14. Patients with a platelet count of less than 30,000.
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