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Klawitter F, Laukien F, Fischer DC, Rahn A, Porath K, Danckert L, Bajorat R, Walter U, Patejdl R, Ehler J. Longitudinal Assessment of Blood-Based Inflammatory, Neuromuscular, and Neurovascular Biomarker Profiles in Intensive Care Unit-Acquired Weakness: A Prospective Single-Center Cohort Study. Neurocrit Care 2024:10.1007/s12028-024-02050-x. [PMID: 38982001 DOI: 10.1007/s12028-024-02050-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Accepted: 06/13/2024] [Indexed: 07/11/2024]
Abstract
BACKGROUND The diagnosis of intensive care unit (ICU)-acquired weakness (ICUAW) and critical illness neuromyopathy (CINM) is frequently hampered in the clinical routine. We evaluated a novel panel of blood-based inflammatory, neuromuscular, and neurovascular biomarkers as an alternative diagnostic approach for ICUAW and CINM. METHODS Patients admitted to the ICU with a Sequential Organ Failure Assessment score of ≥ 8 on 3 consecutive days within the first 5 days as well as healthy controls were enrolled. The Medical Research Council Sum Score (MRCSS) was calculated, and motor and sensory electroneurography (ENG) for assessment of peripheral nerve function were performed at days 3 and 10. ICUAW was defined by an MRCSS < 48 and CINM by pathological ENG alterations, both at day 10. Blood samples were taken at days 3, 10, and 17 for quantitative analysis of 18 different biomarkers (white blood cell count, C-reactive protein, procalcitonin, C-terminal agrin filament, fatty-acid-binding protein 3, growth and differentiation factor 15, syndecan 1, troponin I, interferon-γ, tumor necrosis factor-α, interleukin-1α [IL-1α], IL-1β, IL-4, IL-6, IL-8, IL-10, IL-13, and monocyte chemoattractant protein 1). Results of the biomarker analysis were categorized according to the ICUAW and CINM status. Clinical outcome was assessed after 3 months. RESULTS Between October 2016 and December 2018, 38 critically ill patients, grouped into ICUAW (18 with and 20 without) and CINM (18 with and 17 without), as well as ten healthy volunteers were included. Biomarkers were significantly elevated in critically ill patients compared to healthy controls and correlated with disease severity and 3-month outcome parameters. However, none of the biomarkers enabled discrimination of patients with and without neuromuscular impairment, irrespective of applied classification. CONCLUSIONS Blood-based biomarkers are generally elevated in ICU patients but do not identify patients with ICUAW or CINM. TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT02706314.
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Affiliation(s)
- Felix Klawitter
- Department of Anesthesiology, Intensive Care Medicine, and Pain Therapy, Rostock University Medical Center, Rostock, 18057, Germany.
| | - Friederike Laukien
- Department of Anesthesiology, Intensive Care Medicine, and Pain Therapy, Rostock University Medical Center, Rostock, 18057, Germany
| | - Dagmar-C Fischer
- Department of Pediatrics, Rostock University Medical Center, Rostock, Germany
| | - Anja Rahn
- Department of Pediatrics, Rostock University Medical Center, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Lena Danckert
- Department of Anesthesiology, Intensive Care Medicine, and Pain Therapy, Rostock University Medical Center, Rostock, 18057, Germany
| | - Rika Bajorat
- Department of Anesthesiology, Intensive Care Medicine, and Pain Therapy, Rostock University Medical Center, Rostock, 18057, Germany
| | - Uwe Walter
- Department of Neurology, Rostock University Medical Center, Rostock, Germany
| | - Robert Patejdl
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Rostock, Germany
- Department of Medicine, Health and Medical University Erfurt, Erfurt, Germany
| | - Johannes Ehler
- Department of Anesthesiology, Intensive Care Medicine, and Pain Therapy, Rostock University Medical Center, Rostock, 18057, Germany
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Jena, Jena, Germany
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Klawitter F, Walter U, Axer H, Patejdl R, Ehler J. Neuromuscular Ultrasound in Intensive Care Unit-Acquired Weakness: Current State and Future Directions. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59050844. [PMID: 37241077 DOI: 10.3390/medicina59050844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/15/2023] [Accepted: 04/20/2023] [Indexed: 05/28/2023]
Abstract
Intensive care unit-acquired weakness (ICUAW) is one of the most common causes of muscle atrophy and functional disability in critically ill intensive care patients. Clinical examination, manual muscle strength testing and monitoring are frequently hampered by sedation, delirium and cognitive impairment. Many different attempts have been made to evaluate alternative compliance-independent methods, such as muscle biopsies, nerve conduction studies, electromyography and serum biomarkers. However, they are invasive, time-consuming and often require special expertise to perform, making them vastly impractical for daily intensive care medicine. Ultrasound is a broadly accepted, non-invasive, bedside-accessible diagnostic tool and well established in various clinical applications. Hereby, neuromuscular ultrasound (NMUS), in particular, has been proven to be of significant diagnostic value in many different neuromuscular diseases. In ICUAW, NMUS has been shown to detect and monitor alterations of muscles and nerves, and might help to predict patient outcome. This narrative review is focused on the recent scientific literature investigating NMUS in ICUAW and highlights the current state and future opportunities of this promising diagnostic tool.
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Affiliation(s)
- Felix Klawitter
- Department of Anesthesiology, Intensive Care Medicine and Pain Therapy, Rostock University Medical Center, Schillingallee 35, 18057 Rostock, Germany
| | - Uwe Walter
- Department of Neurology, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany
| | - Hubertus Axer
- Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Robert Patejdl
- Department of Medicine, Health and Medical University Erfurt, 99089 Erfurt, Germany
| | - Johannes Ehler
- Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
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Mitochondrial Dysfunction in Intensive Care Unit-Acquired Weakness and Critical Illness Myopathy: A Narrative Review. Int J Mol Sci 2023; 24:ijms24065516. [PMID: 36982590 PMCID: PMC10052131 DOI: 10.3390/ijms24065516] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/03/2023] [Accepted: 03/09/2023] [Indexed: 03/16/2023] Open
Abstract
Mitochondria are key structures providing most of the energy needed to maintain homeostasis. They are the main source of adenosine triphosphate (ATP), participate in glucose, lipid and amino acid metabolism, store calcium and are integral components in various intracellular signaling cascades. However, due to their crucial role in cellular integrity, mitochondrial damage and dysregulation in the context of critical illness can severely impair organ function, leading to energetic crisis and organ failure. Skeletal muscle tissue is rich in mitochondria and, therefore, particularly vulnerable to mitochondrial dysfunction. Intensive care unit-acquired weakness (ICUAW) and critical illness myopathy (CIM) are phenomena of generalized weakness and atrophying skeletal muscle wasting, including preferential myosin breakdown in critical illness, which has also been linked to mitochondrial failure. Hence, imbalanced mitochondrial dynamics, dysregulation of the respiratory chain complexes, alterations in gene expression, disturbed signal transduction as well as impaired nutrient utilization have been proposed as underlying mechanisms. This narrative review aims to highlight the current known molecular mechanisms immanent in mitochondrial dysfunction of patients suffering from ICUAW and CIM, as well as to discuss possible implications for muscle phenotype, function and therapeutic approaches.
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Klawitter F, Walter U, Patejdl R, Endler J, Reuter DA, Ehler J. Sonographic Evaluation of Muscle Echogenicity for the Detection of Intensive Care Unit-Acquired Weakness: A Pilot Single-Center Prospective Cohort Study. Diagnostics (Basel) 2022; 12:diagnostics12061378. [PMID: 35741188 PMCID: PMC9221760 DOI: 10.3390/diagnostics12061378] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/29/2022] [Accepted: 06/01/2022] [Indexed: 02/04/2023] Open
Abstract
Qualitative assessment by the Heckmatt scale (HS) and quantitative greyscale analysis of muscle echogenicity were compared for their value in detecting intensive care unit-acquired weakness (ICU-AW). We performed muscle ultrasound (MUS) of eight skeletal muscles on day 3 and day 10 after ICU admission. We calculated the global mean greyscale score (MGS), the global mean z-score (MZS) and the global mean Heckmatt score (MHS). Longitudinal outcome was defined by the modified Rankin scale (mRS) and Barthel index (BI) after 100 days. In total, 652 ultrasound pictures from 38 critically ill patients (18 with and 20 without ICU-AW) and 10 controls were analyzed. Patients with ICU-AW had a higher MHS on day 10 compared to patients without ICU-AW (2.6 (0.4) vs. 2.2 (0.4), p = 0.006). The MHS was superior to ROC analysis (cut-off: 2.2, AUC: 0.79, p = 0.003, sensitivity 86%, specificity 60%) in detecting ICU-AW compared to MGS and MZS on day 10. The MHS correlated with the Medical Research Council sum score (MRC-SS) (r = −0.45, p = 0.004), the mRS (r = 0.45; p = 0.007) and BI (r = −0.38, p = 0.04) on day 100. Qualitative MUS analysis seems superior to quantitative greyscale analysis of muscle echogenicity for the detection of ICU-AW.
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Affiliation(s)
- Felix Klawitter
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Rostock, 18057 Rostock, Germany; (J.E.); (D.A.R.); (J.E.)
- Correspondence:
| | - Uwe Walter
- Department of Neurology, University Medical Center Rostock, 18147 Rostock, Germany;
| | - Robert Patejdl
- Oscar Langendorff Institute of Physiology, University Medical Center Rostock, 18057 Rostock, Germany;
| | - Josefine Endler
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Rostock, 18057 Rostock, Germany; (J.E.); (D.A.R.); (J.E.)
| | - Daniel A. Reuter
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Rostock, 18057 Rostock, Germany; (J.E.); (D.A.R.); (J.E.)
| | - Johannes Ehler
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Rostock, 18057 Rostock, Germany; (J.E.); (D.A.R.); (J.E.)
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