Accuracy of the ice test in the diagnosis of myasthenia gravis in patients with ptosis.

Introduction: Several studies have reported high diagnostic sensitivity and specificity for the ice test in myasthenia gravis. All of the studies employed a case-control design, in which the diagnosis was already known at the time of the test for both patients and controls, leading to case selection bias. This suggests that the available literature substantially overestimates the diagnostic utility of these tests.

Needle electromyographic findings in 98 patients with myositis.

Background/aims: Little is known about the distribution of electromyographic (EMG) abnormalities in myositis even though this is relevant in daily practice.

Methods: A retrospective semiquantitative analysis of needle EMG findings was performed in a group of 98 patients with myositis. The frequency, type, and distribution of abnormalities were studied.