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Reductions in muscle quality and quantity in chronic inflammatory demyelinating polyneuropathy patients assessed by magnetic resonance imaging.
Muscle & Nerve 2018 September
INTRODUCTION: Weakness in patients with chronic inflammatory demyelinating polyneuropathy (CIDP) may be caused by decreases in muscle quantity and quality, but this has not been explored.
METHODS: Twelve patients with CIDP (mean age 61 years) and 10 age-matched (mean age 59 years) control subjects were assessed for ankle dorsiflexion strength, and two different MRI scans (T1 and T2) of leg musculature.
RESULTS: Isometric strength was 36% lower in CIDP patients compared with controls. Tibialis anterior muscle volumes of CIDP patients were smaller by ∼17% compared with controls, and non-contractile tissue volume was ∼58% greater in CIDP patients. When normalized to total muscle or corrected contractile volume, strength was ∼29% and ∼18% lower, respectively, in CIDP patients.
DISCUSSION: These results provide insight into the structural integrity of muscle contractile proteins and pathologic changes to whole-muscle tissue composition that contribute to impaired muscle function in CIDP. Muscle Nerve 58: 396-401, 2018.
METHODS: Twelve patients with CIDP (mean age 61 years) and 10 age-matched (mean age 59 years) control subjects were assessed for ankle dorsiflexion strength, and two different MRI scans (T1 and T2) of leg musculature.
RESULTS: Isometric strength was 36% lower in CIDP patients compared with controls. Tibialis anterior muscle volumes of CIDP patients were smaller by ∼17% compared with controls, and non-contractile tissue volume was ∼58% greater in CIDP patients. When normalized to total muscle or corrected contractile volume, strength was ∼29% and ∼18% lower, respectively, in CIDP patients.
DISCUSSION: These results provide insight into the structural integrity of muscle contractile proteins and pathologic changes to whole-muscle tissue composition that contribute to impaired muscle function in CIDP. Muscle Nerve 58: 396-401, 2018.
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