With more than 130 separate reports of what purports to be a clinical syndrome first recognized and described as such by Brock in 1957, the average cardiologist still remains uncertain about the precise characteristics of hypertrophic obstruction of the left ventricular outflow. When he finishes reading this symposium, he will find that he has considerable company among the experts, of whom one summarizes (p 307): "... coming to a conclusion, which I gather from this symposium is very unpopular." Twenty-nine experts from the English speaking Western world assembled in London in April of 1964 and exchanged ideas about this newly recognized syndrome without much success in defining it clearly or in accepting terminology for it. Still, a group of symptoms and findings do appear together, and the internist and cardiologist must be prepared to recognize and deal with them.
The pathologist may fail to recognize the syndrome even when he has