Allied Professionals (Non-physician submissions only) -> Clinical Research D-PO02 - Poster Session II (ID 47) Poster

D-PO02-039 - Impact Of Body Mass Index On Defibrillation Threshold Test Result And Shock Lead Impedance At Subcutaneous Implantable Cardioverter-defibrillator Implantation (ID 992)


Background: Subcutaneous implantable cardioverter-defibrillator (S-ICD) system is implanted without intracardiac instrumentation. Therefore, adverse events related to implantation of transvenous ICD system can be avoided. However, the defibrillation threshold (DFT) test is still recommended. At S-ICD implantation, the subcutaneous electrode must be positioned in close proximity to, or in contact with the deep fascia. On the other hand, it is more difficult to position the electrode appropriately in overweight patients. Higher DFT is known to be associated with overweight.
Objective: The aim of this study was to determine whether body mass index (BMI) is associated with DFT test results and shock lead impedance.
Methods: Between February 2016 and November 2019, 101 patients underwent S-ICD implantation at our institute. We categorize them into 2 groups: BMI below 25 kg/m² (BMI<25 group) and BMI 25 kg/m² or above (BMI≥25 group). Then we compared DFT test results and shock lead impedance between two groups.
Results: There were 68 patients in BMI<25 group and 33 patients in BMI≥25 group. DFT test was performed in 57 patients in BMI<25 group and 30 in BMI≥25 group. Conversion success rates at 65 J were 98.2% in BMI<25 group and 90.0% in BMI≥25 group (p = 0.81). Conversion was successful at 80 J in the remaining patients (1 in BMI<25 group and 3 in BMI≥25 group). Shock lead impedance was not different between two groups (61±17Ω in BMI<25 group, 63±12Ω in BMI≥25 group; p = 0.58).
Conclusion: BMI was not associated with DFT test result or shock lead impedance. From our single center experience, higher BMI does not affect the use of S-ICD clinically.