Cooperative study of hospital frequency and character of transient ischemic attacks. IV. The reliability of diagnosis

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Abstract
All patients (1328) suspected of having transient ischemic attacks (TIA) over a 21 mo. period were identified. Each case was reviewed by a neurological investigator, and a definite diagnosis of TIA was supported in 39% and ruled out in 30%. The reliability of the neurologist''s review diagnosis was assessed by 3 methods, and close agreement (84-93%) was obtained. Factors demonstrated to effect the diagnosis were historical information, neurological training of the examiners, type of symptom complex, presence of carotid artery bruits and examination during an attack.