Published online by Cambridge University Press: 29 January 2018
The blood pressure response to the injection of the parasympathomimetic drug methacholine (Mecholyl) has been used extensively in psychiatry to delineate various aspects of mental disease. Although originally used in diagnostic classification (Altman et al., 1943), its use, following the investigations of Funkenstein and his co-workers (1948, 1952), has more often been as an aid in prognosis or as a guide to the most useful type of somatic therapy. Investigations into this aspect of the test have resulted in many contradictory reports, and even after so many years there is still no agreement on the test's validity or usefulness.
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