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After comments on the rarity of material suitable for this study and on the difficulty of distinguishing between features that are caused by the heart disease and those that belong to the make-up of the patient, Leyser presents a series of cases arranged in three groups: psychoses with heart disease uncomplicated by other conditions that might lead to neuropsychic disturbances; psychoses with heart disease complicated by cerebral arteriosclerosis and other disease conditions, and psychoses in which the heart disease is a complicating factor.
Disturbances in heart function may give rise to two kinds of mental disorder: In the first group are syndromes caused by the unknown noxae that are produced by the heart disease—manic and depressive moods, stupor, delirium, hyperkineses, twilight states, hallucinoses and confusion—all of them heteronomous symptom-complexes or exogenous reaction types in the sense of Bonhoeffer, with the possible exception of depression. When homonomous syndromes are
Herzkrankheiten und Psychosen. (Psychoses Associated with Heart Diseases). Eine klinische Studie.. Arch NeurPsych. 1927;17(4):568-569. doi:10.1001/archneurpsyc.1927.02200340144013