Читать книгу Neurology - Charles H. Clarke - Страница 149

Myotonic muscle (dystrophia myotonica; Chapter 10) responds to stimulation with high frequency action potentials. The discharge frequency diminishes as the seconds pass to create a whine, likened to a dive‐bomber of propeller‐driven vintage. A softer sound can be heard through a stethoscope over a contracting myotonic muscle. Complex repetitive discharges, a.k.a. pseudo‐myotonic, commence and end abruptly; they occur in chronic neuropathies and myopathies.