[Fatal outcome caused by lysthenon in a child at the early stage of primary myopathy].

A child aged 3 years 10 months with latent early stage of primary myopathy died during surgery for left-side cryptorchidism after injection of lysthenon. Asystole, the immediate cause of death, was caused by release of potassium ions from skeletal muscles into the blood. Myopathy was diagnosed at autopsy by histological examination of the diaphragm and mm. pectoralis major and gastrocnemius.