Table 3.

Diagnostic criteria of critical illness myopathy

SNAP amplitudes >80% of the lower limit of normal EMG studies with short-duration, low-amplitude MUPs with early or normal full recruitment, with or without fibrillation potentials Absence of a decremental response on repetitive nerve stimulation Muscle histopathological findings of myopathy with myosin loss CMAP amplitudes <80% of the lower limit of normal in two or more nerves without conduction block Elevated serum creatine kinase Demonstration of muscle in-excitability

Adapted from Bolton⁴

SNAP, sensory nerve action potential; EMG, electromyography; MUP, motor unit potential; CMAP, compound muscle action potential