Electrocardiograms were examined in 121 persons exposed to carbon disulphide (CS2). The control group consisted of 77 persons, employed in the divisions whose activity range is similar to that of exposed workers. A more frequent occurrence of abnormal electrocardiograms was found in the workers exposed to CS2, compared with the control group. Most frequently they comprised dysrythmia, disturbances in conduction, and occurrence of focal changes of cardiac muscle--which were not found in the subjects of control group. The occurrence of changes in ECG picture should be connected with the occurrence of premature atherosclerosis in the workers exposed to CS2. A permanent observation of ECG picture in those exposed to CS2 will allow an earlier prophylaxis of carbon disulphide intoxications.