The stimuli coming out of the right atrium of the heart, which we call the sinus node, spread to the ventricles after passing through the atrio ventricular node, which is located between the atria and the ventricles of the heart. Thus, the electrical impulse produced in the sinus node is transmitted to all cardiac muscle cells, and the contraction of the heart occurs. For many reasons, there may be malfunctions in this normal warning and conduction system of the heart. Sometimes, additional congenital pathways in the heart can affect this warning and conduction system, causing rapid heartbeats, a condition called tachycardia. Sometimes, stimulus from any part of the heart and beyond the control of the sinus node may cause tachycardia. Electrophysiological work (EPS) is like cardiac catheterization or coronary angiography. The procedure is done in catheter laboratories by working with x-rays to monitor the position of the catheter within the heart. It usually requires 1 day of hospitalization. However, depending on the situation, the patient can leave on the same day. The doctor should be asked about the use of drugs and which drugs should be continued. The catheter is mostly placed in the right groin, but sometimes more than one catheter is placed depending on the characteristics of the EPS. The process can take from 20-30 minutes to 2-3 hours depending on the purpose of EPS. Images are recorded while the catheter is in different parts of the heart. With EPS, the function of the electrical system and conduction pathways of the heart can be controlled, and sometimes electrical stimulation can be given to see if arrhythmia occurs. Simultaneous ablation can also be performed, especially in the presence of abnormal conduction pathways or in the presence of foci that produce abnormal impulses. With ablation, these areas are removed with radiofrequency energy so that diagnosis and posterior treatment can be performed together.

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