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The ubiquitous but poorly understood symptom of fainting has been classified in this excellent and useful book as follows:
Fainting with peripheral circulatory inadequacy; with cardiac disorders; with respiratory and pulmonary disorders; with cerebral disorders; and fainting of primary psychic origin. The symptom of fainting is exhaustively considered.
The chapters on Incidence and Diagnosis and on the Differential Diagnosis of Syncope are well done and instructive. Probably the most useful and informative chapter is that on fainting with cerebral disorders. It is emphasized that while carotid sinus reflex hypersensitivity is quite common, actual syncope of this origin is not at all common. The problems involved in the diagnosis and identification of the cerebral type of carotid sinus syncope are carefully considered. Whether cerebral vasospasm ever is responsible for transient symptoms of syncope, the author lets remain a moot point, but nevertheless he generously documents the argument that vasospasm in cerebral
Merritt HH. Fainting: Physiological and Psychological Considerations.. Arch Neurol. 1962;7(6):589–590. doi:10.1001/archneur.1962.04210060107011