Extraocular muscle hypertrophy in myotonia congenita.

Myotonia congenita (MC) is a rare disorder of skeletal muscle caused by mutations in the CLCN1 gene,(1,2) which encodes the chloride ion channel found in the t-tubule of skeletal muscle. MC is characterized by impaired relaxation of voluntary muscle after sudden contraction that diminishes with muscle activity, known as the "warm-up effect." Individuals with MC can develop muscular hypertrophy despite little physical activity.

Strabismus after regional anesthesia for cataract surgery.

Background: An adult strabismus clinic in a regional eye centre provided an opportunity to estimate the risk of postoperative diplopia from regional anesthesia after cataract surgery and to describe the management of these patients.

Methods: Retrospective cohort analysis. All cases were referred over a 22-month period (November 1997 to September 1999) for investigation of postoperative diplopia after cataract surgery.