Table 3.
Substrate recurrence rate by patient-specific ablation procedure parameters
| 0 to 2 Months | 2 to 6 Months+ | 6 to 12 Months+ | 0 to 6 Months | 0 to 12 Months | |
|---|---|---|---|---|---|
| Total substrates | 7.0% (35/500) | 2.3% (10/427) | 1.7% (6/352) | 9.2% | 10.7% |
| Fluoroscopy time for patient (min) | |||||
| 1–20 | 5.5% (8/146) | 0.0% (0/124) | 0.9% (1/111) | 5.5% | 6.3% |
| 21–30 | 2.9% (3/102) | 4.6% (4/87) | 4.1% (3/74) | 7.4% | 11.2% |
| 31–50 | 6.8% (9/132) | 2.5% (3/118) | 0.0% (0/90) | 9.2% | 9.2% |
| >50 | 10.9% (12/110) | 2.2% (2/91) | 0.0% (0/71) | 12.9% | 12.9% |
| Unknown | 30.0% (3/10) | 14.3% (1/7) | 16.7% (1/6) | 40.0% | 50.0% |
| Total procedure time for patient (min) | |||||
| 1–150 | 5.2% (6/116) | 1.0% (1/97) | 1.2% (1/85) | 6.2% | 7.3% |
| 151–200 | 6.1% (8/131) | 3.4% (4/118) | 2.2% (2/91) | 9.3% | 11.3% |
| 201–250 | 9.7% (11/113) | 3.4% (3/88) | 1.3% (1/76) | 12.8% | 14.0% |
| >250 | 5.8% (7/120) | 1.0% (1/105) | 1.2% (1/84) | 6.7% | 7.8% |
| Unknown | 15.0% (3/20) | 5.3% (1/19) | 6.3% (1/16) | 19.5% | 24.5%a |
| Number of RF applications >20 s for patient | |||||
| 1–3 | 4.2% (11/265) | 2.1% (5/235) | 1.0% (2/198) | 6.2% | 7.1% |
| 4–6 | 10.4% (11/106) | 2.4% (2/84) | 1.5% (1/67) | 12.5% | 13.8% |
| 7–10 | 12.5% (9/72) | 3.5% (2/57) | 2.2% (1/45) | 15.6% | 17.4% |
| >10 | 6.3% (2/32)c | 0.0% (0/30) | 4.3% (1/23) | 6.3% | 10.3% |
| Unknown | 8.0% (2/25) | 4.8% (1/21) | 5.3% (1/19) | 12.4% | 17.0% |
| Total number of RF applications for patient* | |||||
| 1–3 | 3.9% (6/154) | 1.5% (2/137) | 0.8% (1/121) | 5.3% | 6.1% |
| 4–6 | 6.5% (8/123) | 2.0% (2/101) | 1.2% (1/83) | 8.4% | 9.5% |
| 7–10 | 4.4% (4/91) | 5.1% (4/78) | 1.6% (1/63) | 9.3% | 10.7% |
| >10 | 11.8% (15/127)c | 0.9% (1/107) | 2.5% (2/81) | 12.6% | 14.8% |
| Unknown | 40.0% (2/5) | 25.0% (1/4) | 25.0% (1/4) | 55.0% | 66.3%b |
| Maximum temperature achieved for patient (°C) | |||||
| 1–50 | 15.2% (5/33) | 4.0% (1/25) | 0.0% (0/23) | 1–50 | 15.2% (5/33) |
| 51–60 | 4.3% (9/208) | 2.2% (4/186) | 0.7% (1/50) | 51–60 | 4.3% (9/208) |
| 61–70 | 8.7% (16/183) | 1.3% (2/156) | 1.5% (2/130) | 61–70 | 8.7% (16/183) |
| >70 | 5.0% (3/60) | 2.2% (1/45) | 2.9% (1/35) | >70 | 5.0% (3/60) |
| Unknown | 12.5% (2/16) | 13.3% (2/15) | 14.3% (2/14) | Unknown | 12.5% (2/16) |
Substrates with recurrences at end of interval/substrates known not to have prior recurrence at beginning of interval.
Statistical significance at
P < .05.
Unknown total procedure time vs known total procedure time, P < .05.
Unknown number of applications >20 s vs known number of applications >20 s, P < .01.
There were 127 substrates for which 2-month follow-up data were available for patients who had >10 radiofrequency (RF) applications at baseline. There were 32 substrates for which 2-month follow-up data were available for patients who had >10 RF applications at baseline with >20 s duration. Because the duration of RF application was measured at the patient level rather than the substrate level, some of those 32 substrates may have no lesions that required an RF application >20 s.