Anomalies in the ST segment, especially ST-segment elevation, require the ruling out of possible etiologies such as myocardial ischemia or pericarditis. However, other non-cardiac disorders such as increases in intra-abdominal and intrathoracic pressure, may cause ST-segment elevation as well and should be considered as possible etiologies due to the poor prognosis they imply in the clinical evolution of the patient. This is especially important in critically ill patients. In this respect, we herein present a case in which the increase in intra-abdominal pressure and thoracic cavity elevation due to gastric and intestinal distension, which was not present in the first CT, provoked a cardiac and coronary compression resulting in T-shaped dome wave, a QT prolongation and ST segment elevation in the inferior leads of the electrocardiogram, the patient did not present at the time of admission, ruling out other possible etiologies such as ionic imbalance or acute ischemia.