Laparoscopic cholecystectomy has been shown to have advantages such as less postoperative pain, early onset of bowel movements, shortening of hospital stay, early return to daily activities and better aesthetic results compared to open surgery. However, increased intra-abdominal pressure (IAP) can negatively affect the respiratory, circulatory, neuroendocrine and central nervous systems. Increased IAP can compress the vena cava and abdominal aorta, causing deterioration in the perfusion of other organs, especially the kidneys and spleen. In addition, this pathological process reduces the preload of the heart, stroke volume, cardiac output and increases central venous pressure, pulmonary capillary wedge pressure, pulmonary artery pressure and left ventricular afterload. IAP can also affect the pressure in the coronary arteries and impair the nutrition of the heart. It should be noted that increased IAP has also been identified as an independent risk factor for mortality in critically ill patients. The QT interval, which represents the time required for ventricular depolarization and repolarization on the ECG, is the time interval from the beginning of the QRS complex to the end of the T wave. Since the Qt interval is affected by the heart rate, it is called QT corrected according to the heart rate, QTc. Prolongation of the peroperative QT and QTc intervals can result in serious complications such as serious arrhythmias, ventricular tachycardia, ventricular fibrillation, and cardiac arrest. Variable QT intervals have been associated with heterogeneous repolarization and ventricular arrhythmias. The frontal plane QRS-T angle is expressed as the absolute difference between the QRS and T wave axes. The frontal plane QRS-T angle, a parameter that can be easily calculated from the 12-lead surface ECG, is considered a marker of ventricular repolarization heterogeneity. Increased ventricular repolarization heterogeneity is associated with an increased risk of arrhythmogenesis. Studies have shown that increased frontal plane QRS-T angle leads to an increased risk of cardiovascular and arrhythmic events and is associated with an increased risk of mortality. Previous publications have reported that the frontal plane QRS-T angle value is stronger, more renewable, and less affected by external factors than the QT/QTc value in showing ventricular repolarization. A wider frontal plane QRS-T angle is considered a strong and independent risk indicator for cardiac morbidity and mortality compared to other traditional cardiovascular risk factors such as the length of the QT interval and electrocardiographic risk indicators. The increase in IAP in laparoscopic surgeries, anesthetic drugs, patient positions, and neuroendocrine response may increase the risk of arrhythmia in the patient. There are many studies on the effects of laparoscopic surgeries, anesthetic drugs, and anesthesia methods that increase IAP on the QT/QTc duration, and there are a limited number of studies in the literature on the effects of another repolarization parameter, the frontal plane QRS-T angle. In this study, researchers investigated perioperative frontal QRS-T angle change and risk of arrhythmia predisposition in patients undergoing laparoscopic cholecystectomy under general anesthesia.
