The purpose of this publication is to identify the prevalence of arrhythmia as one of the manifestations of gastrocardial syndrome in patients with hernias of the esophageal orifice of the diaphragm and reflux esophagitis. To evaluate the results of antireflux surgery in the dynamics of arrhythmia regression. Materials and methods: the study included 101 patients with hiatal hernias who were undergoing inpatient examination and treatment. Arrhythmia was detected in 35 (34.6%) of 101 patients with hernias of the esophageal orifice of the diaphragm. Arrhythmias are characteristic of cardiofundal (40%), subtotal (66.6%) and total (100.0%) hernias of the esophageal orifice of the diaphragm, were recorded at a younger age, were dependent on the duration of the underlying disease. Clinical manifestations of arrhythmia depended on the degree of shortening of the esophagus, most often arrhythmias occurred with shortening of the esophagus of the II degree in cardiofundal hernias (68.7%), subtotal (60.0%) and total (100.0%). As a result of antireflux surgery, clinical manifestations of arrhythmia regressed in 19 (54.3%), in 26 (74.2%) patients, electrocardiogram and Holter monitoring indicators decreased or were absent altogether. In conclusion, it should be emphasized that arrhythmias on the background of hernia of the esophageal orifice of the diaphragm, associated with anatomotopographic and physiological features, are a frequent clinical situation characterized by the mutually aggravating effect of both diseases on each other. An instrumental study of the state of the cardiovascular system in the pathology of the upper gastrointestinal tract showed that there is an improvement in the indicators of cardiac arrhythmias associated with the underlying disease, the correction of which is possible only with surgical treatment of the underlying disease.