Table 2.
Radiation-induced ICD failures, maximum dose, and local dose rates at the specified measurement positions
| Group | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Maximum ICD dose (Gy) | 3.9 | 1.5 | 3.4 | 1.1 | 0.4 |
| Local dose rate (cGy/min) | 16.8 | 6.6 | 46.8 | 15.6 | 6.0 |
| Initial experiments (62 nonirradiated ICD) | |||||
| No failuresa | n = 8 (M, SJM) | n = 16 (M, SJM) | n = 7 (M) | n = 7 (M) | n = 16 (M, SJM) |
| Failuresa | n = 2 (M, SJM) | – | n = 3 (M) | n = 3 (M) | – |
| Experiments with ICD failures at higher dose rates were repeated after 8 weeks with group 5 settings | |||||
| No failuresa | n = 2 (M, SJM) | – | n = 1 (M) | n = 3 (M) | – |
| Failuresa | – | – | n = 2 (M) | – | – |
ICD implantable cardioverter–defibrillator
a Letters in parentheses denote manufacturer: Medtronic (M); Saint Jude Medical/Abbott (SJM)