XI.A. Preoperative

Class of Recommendation I

Recommendation	Class of recommendation	Level of evidence
Determine if the patient has a unicameral or bicameral pacemaker, resynchronizer, defibrillator, or multiple prostheses based on clinical history, physical examination, scar evaluation, electrocardiographic record, chest or abdomen X-ray, and previous evaluations in specialized clinics	I	C
Assess whether there is a risk of electromagnetic interference during the planned diagnostic and/or surgical procedure	I	B
Evaluate the presence of equipment in the surgical room with potential to generate electromagnetic fields that could interfere with the CIED	I	C
Patients with ICDs should be monitored with continuous ECG until the antitachycardia function is switched off	I	C
Determine the function of the device with an assessment by a specialist to adjust the program. In the absence of a specialist, at least assess whether there is an effective pacemaker spike (which generates command) in the ECG. Consult the manufacturer of the prosthesis for additional recommendations	IIa	C