Electrocardiographic changes in response to esophageal atrial electrostimulation were examined in relation to the severity of coronary-bed affection in 99 patients with suspected coronary heart disease. Esophageal atrial electrostimulation was equal, in terms of specificity and sensitivity (73 and 78%, respectively), to bicycle ergometry (77 and 74%), and was superior to it by far in terms of adjustment to diagnostic electrocardiographic criteria. A direct relationship was demonstrated between total ST depression induced by esophageal atrial electrostimulation and the extent of coronary-bed affection expressed as the number of affected coronary arteries or the impaired blood supply area.
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