IBHRE Exam with Questions and Solutions

IBHRE Exam with Questions and Solutions Which of the following lead insulation materials are known for reducing fibroblast in-growth and susceptibility to MIO (metal ions degrade) and ESC (environmental stress cracking), respectively? a. Silicone and 55D polyurethane b. Silicone and ETFE c. 80A polyurethane and silicone/polyurethane hybrid d. ePTFE and 80A polyurethane ANSWER d. ePTFE and 80A polyurethane (Poly you can make smaller Fr lead. Slippery, tougher material) (ePTFE on shocking coils, white coating) Which of the following are the two most common cause of "safety pacing" or "ventricular safety standby"? a. Ventricular ectopy and loss of atrial sensing b. Crosstalk and retrograde conduction c. Loss of atrial sensing and PMT d. Atrial ectopy and farfield oversensing ANSWER a. Ventricular ectopy and loss of atrial sensing AP event, VSP interval initiated (common w PVCs too) (short AV Delay) Which of the following electrode materials would most likely result in higher pacing thresholds