Changes in lead parameters (post minus pre) after magnetic resonance imaging scanning, stratified by magnetic resonance conditionality of individual leads
| Lead variable . | MR-conditional leads . | Non-MR conditional leads . | P . | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | N . | Pre . | Post . | Change (95% CI) . | P . | N . | Pre . | Post . | Change (95% CI) . | P . | (between groups) . | ||||||
| Right atrial | |||||||||||||||||
| Amplitude (mV) | 630 | 3.4 | (2.2, 4.9) | 3.3 | (2.1, 4.8) | −0.1 | (−0.05, −0.18) | 0.002 | 177 | 2.7 | (1.6, 4.3) | 2.8 | (1.5, 4) | −0.1 | (0.05, −0.2) | 0.304 | 0.350 |
| Threshold (V) | 602 | 0.7 | (0.5, 0.75) | 0.7 | (0.5, 0.75) | 0.0 | (0, −0.07) | 0.113 | 178 | 0.75 | (0.5, 1) | 0.75 | (0.6, 1) | 0.0 | (0.1, 0) | 0.169 | 0.124 |
| Impedance (Ω) | 664 | 490 | (437 580) | 486.5 | (432 569) | −11.0 | (−9, −14) | <0.001 | 188 | 480 | (399 581) | 469 | (400 559) | −7.5 | (−2.5, −12) | 0.004 | 0.198 |
| Right ventricular | |||||||||||||||||
| Amplitude (mV) | 673 | 11.8 | (7.8, 15.8) | 11.4 | (8, 16) | −0.3 | (−0.25, −0.45) | <0.001 | 199 | 10.9 | (6, 12) | 10.25 | (6, 12) | −0.4 | (−0.2, −0.7) | <0.001 | 0.666 |
| Threshold (V) | 785 | 0.75 | (0.6, 1) | 0.75 | (0.55, 1) | 0.0 | (0, −0.03) | 0.525 | 235 | 0.9 | (0.75, 1.25) | 0.9 | (0.75, 1.25) | 0.0 | (0.08, −0.02) | 0.468 | 0.567 |
| Impedance (Ω) | 780 | 494 | (436 605) | 494 | (430 590) | −9.5 | (−6, −11) | <0.001 | 238 | 540 | (441 655) | 536 | (440 637) | −8.0 | (−4, −12) | <0.001 | 0.461 |
| HV impedance (Ω) | 282 | 65 | (51, 77) | 66.5 | (50, 77) | 0.5 | (1, 0) | 0.178 | 84 | 51 | (47, 62) | 51.5 | (48, 61) | −0.5 | (0.5, −1) | 0.390 | 0.453 |
| Left ventricular | |||||||||||||||||
| Amplitude (mV) | 26 | 17.8 | (10, 25) | 16.85 | (11, 25) | 0.1 | (0.95, −0.9) | 0.887 | 17 | 14.1 | (10, 18) | 15 | (10, 18) | −0.2 | (0.51, −0.81) | 0.629 | 0.617 |
| Threshold (V) | 96 | 1.05 | (0.75, 1.5) | 1.1 | (0.75, 1.5) | 0.1 | (0.2, 0.02) | 0.015 | 44 | 1.00 | (0.75, 1.5) | 1.00 | (0.75, 1.25) | −0.1 | (0.03, −0.35) | 0.123 | 0.003 |
| Impedance (Ω) | 92 | 716 | (563 852) | 703 | (549 858) | −15.5 | (−6, −25) | 0.002 | 45 | 722 | (494 977) | 689 | (523 955) | −13.0 | (0, −26) | 0.058 | 0.266 |
| Lead variable . | MR-conditional leads . | Non-MR conditional leads . | P . | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | N . | Pre . | Post . | Change (95% CI) . | P . | N . | Pre . | Post . | Change (95% CI) . | P . | (between groups) . | ||||||
| Right atrial | |||||||||||||||||
| Amplitude (mV) | 630 | 3.4 | (2.2, 4.9) | 3.3 | (2.1, 4.8) | −0.1 | (−0.05, −0.18) | 0.002 | 177 | 2.7 | (1.6, 4.3) | 2.8 | (1.5, 4) | −0.1 | (0.05, −0.2) | 0.304 | 0.350 |
| Threshold (V) | 602 | 0.7 | (0.5, 0.75) | 0.7 | (0.5, 0.75) | 0.0 | (0, −0.07) | 0.113 | 178 | 0.75 | (0.5, 1) | 0.75 | (0.6, 1) | 0.0 | (0.1, 0) | 0.169 | 0.124 |
| Impedance (Ω) | 664 | 490 | (437 580) | 486.5 | (432 569) | −11.0 | (−9, −14) | <0.001 | 188 | 480 | (399 581) | 469 | (400 559) | −7.5 | (−2.5, −12) | 0.004 | 0.198 |
| Right ventricular | |||||||||||||||||
| Amplitude (mV) | 673 | 11.8 | (7.8, 15.8) | 11.4 | (8, 16) | −0.3 | (−0.25, −0.45) | <0.001 | 199 | 10.9 | (6, 12) | 10.25 | (6, 12) | −0.4 | (−0.2, −0.7) | <0.001 | 0.666 |
| Threshold (V) | 785 | 0.75 | (0.6, 1) | 0.75 | (0.55, 1) | 0.0 | (0, −0.03) | 0.525 | 235 | 0.9 | (0.75, 1.25) | 0.9 | (0.75, 1.25) | 0.0 | (0.08, −0.02) | 0.468 | 0.567 |
| Impedance (Ω) | 780 | 494 | (436 605) | 494 | (430 590) | −9.5 | (−6, −11) | <0.001 | 238 | 540 | (441 655) | 536 | (440 637) | −8.0 | (−4, −12) | <0.001 | 0.461 |
| HV impedance (Ω) | 282 | 65 | (51, 77) | 66.5 | (50, 77) | 0.5 | (1, 0) | 0.178 | 84 | 51 | (47, 62) | 51.5 | (48, 61) | −0.5 | (0.5, −1) | 0.390 | 0.453 |
| Left ventricular | |||||||||||||||||
| Amplitude (mV) | 26 | 17.8 | (10, 25) | 16.85 | (11, 25) | 0.1 | (0.95, −0.9) | 0.887 | 17 | 14.1 | (10, 18) | 15 | (10, 18) | −0.2 | (0.51, −0.81) | 0.629 | 0.617 |
| Threshold (V) | 96 | 1.05 | (0.75, 1.5) | 1.1 | (0.75, 1.5) | 0.1 | (0.2, 0.02) | 0.015 | 44 | 1.00 | (0.75, 1.5) | 1.00 | (0.75, 1.25) | −0.1 | (0.03, −0.35) | 0.123 | 0.003 |
| Impedance (Ω) | 92 | 716 | (563 852) | 703 | (549 858) | −15.5 | (−6, −25) | 0.002 | 45 | 722 | (494 977) | 689 | (523 955) | −13.0 | (0, −26) | 0.058 | 0.266 |
Comparisons between MR-conditional and non-MR conditional lead groups are made as comparisons of percentage change to avoid baseline differences in absolute measurements. The number of lead comparisons is smaller than the number of total patients and depends on the number of leads implanted, variable underlying rhythm, variable pulse width, device, and the presence of atrial fibrillation. In these cases, there was no clinically significant change on interrogation. P-values are for pre- vs. post-comparisons and for the comparison of changes post-MRI between MR-conditional and non-MR conditional leads (between groups). Statistically significant comparisons shown in bold (p<0.05).
MR, magnetic resonance; MRI, magnetic resonance imaging.
Changes in lead parameters (post minus pre) after magnetic resonance imaging scanning, stratified by magnetic resonance conditionality of individual leads
| Lead variable . | MR-conditional leads . | Non-MR conditional leads . | P . | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | N . | Pre . | Post . | Change (95% CI) . | P . | N . | Pre . | Post . | Change (95% CI) . | P . | (between groups) . | ||||||
| Right atrial | |||||||||||||||||
| Amplitude (mV) | 630 | 3.4 | (2.2, 4.9) | 3.3 | (2.1, 4.8) | −0.1 | (−0.05, −0.18) | 0.002 | 177 | 2.7 | (1.6, 4.3) | 2.8 | (1.5, 4) | −0.1 | (0.05, −0.2) | 0.304 | 0.350 |
| Threshold (V) | 602 | 0.7 | (0.5, 0.75) | 0.7 | (0.5, 0.75) | 0.0 | (0, −0.07) | 0.113 | 178 | 0.75 | (0.5, 1) | 0.75 | (0.6, 1) | 0.0 | (0.1, 0) | 0.169 | 0.124 |
| Impedance (Ω) | 664 | 490 | (437 580) | 486.5 | (432 569) | −11.0 | (−9, −14) | <0.001 | 188 | 480 | (399 581) | 469 | (400 559) | −7.5 | (−2.5, −12) | 0.004 | 0.198 |
| Right ventricular | |||||||||||||||||
| Amplitude (mV) | 673 | 11.8 | (7.8, 15.8) | 11.4 | (8, 16) | −0.3 | (−0.25, −0.45) | <0.001 | 199 | 10.9 | (6, 12) | 10.25 | (6, 12) | −0.4 | (−0.2, −0.7) | <0.001 | 0.666 |
| Threshold (V) | 785 | 0.75 | (0.6, 1) | 0.75 | (0.55, 1) | 0.0 | (0, −0.03) | 0.525 | 235 | 0.9 | (0.75, 1.25) | 0.9 | (0.75, 1.25) | 0.0 | (0.08, −0.02) | 0.468 | 0.567 |
| Impedance (Ω) | 780 | 494 | (436 605) | 494 | (430 590) | −9.5 | (−6, −11) | <0.001 | 238 | 540 | (441 655) | 536 | (440 637) | −8.0 | (−4, −12) | <0.001 | 0.461 |
| HV impedance (Ω) | 282 | 65 | (51, 77) | 66.5 | (50, 77) | 0.5 | (1, 0) | 0.178 | 84 | 51 | (47, 62) | 51.5 | (48, 61) | −0.5 | (0.5, −1) | 0.390 | 0.453 |
| Left ventricular | |||||||||||||||||
| Amplitude (mV) | 26 | 17.8 | (10, 25) | 16.85 | (11, 25) | 0.1 | (0.95, −0.9) | 0.887 | 17 | 14.1 | (10, 18) | 15 | (10, 18) | −0.2 | (0.51, −0.81) | 0.629 | 0.617 |
| Threshold (V) | 96 | 1.05 | (0.75, 1.5) | 1.1 | (0.75, 1.5) | 0.1 | (0.2, 0.02) | 0.015 | 44 | 1.00 | (0.75, 1.5) | 1.00 | (0.75, 1.25) | −0.1 | (0.03, −0.35) | 0.123 | 0.003 |
| Impedance (Ω) | 92 | 716 | (563 852) | 703 | (549 858) | −15.5 | (−6, −25) | 0.002 | 45 | 722 | (494 977) | 689 | (523 955) | −13.0 | (0, −26) | 0.058 | 0.266 |
| Lead variable . | MR-conditional leads . | Non-MR conditional leads . | P . | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | N . | Pre . | Post . | Change (95% CI) . | P . | N . | Pre . | Post . | Change (95% CI) . | P . | (between groups) . | ||||||
| Right atrial | |||||||||||||||||
| Amplitude (mV) | 630 | 3.4 | (2.2, 4.9) | 3.3 | (2.1, 4.8) | −0.1 | (−0.05, −0.18) | 0.002 | 177 | 2.7 | (1.6, 4.3) | 2.8 | (1.5, 4) | −0.1 | (0.05, −0.2) | 0.304 | 0.350 |
| Threshold (V) | 602 | 0.7 | (0.5, 0.75) | 0.7 | (0.5, 0.75) | 0.0 | (0, −0.07) | 0.113 | 178 | 0.75 | (0.5, 1) | 0.75 | (0.6, 1) | 0.0 | (0.1, 0) | 0.169 | 0.124 |
| Impedance (Ω) | 664 | 490 | (437 580) | 486.5 | (432 569) | −11.0 | (−9, −14) | <0.001 | 188 | 480 | (399 581) | 469 | (400 559) | −7.5 | (−2.5, −12) | 0.004 | 0.198 |
| Right ventricular | |||||||||||||||||
| Amplitude (mV) | 673 | 11.8 | (7.8, 15.8) | 11.4 | (8, 16) | −0.3 | (−0.25, −0.45) | <0.001 | 199 | 10.9 | (6, 12) | 10.25 | (6, 12) | −0.4 | (−0.2, −0.7) | <0.001 | 0.666 |
| Threshold (V) | 785 | 0.75 | (0.6, 1) | 0.75 | (0.55, 1) | 0.0 | (0, −0.03) | 0.525 | 235 | 0.9 | (0.75, 1.25) | 0.9 | (0.75, 1.25) | 0.0 | (0.08, −0.02) | 0.468 | 0.567 |
| Impedance (Ω) | 780 | 494 | (436 605) | 494 | (430 590) | −9.5 | (−6, −11) | <0.001 | 238 | 540 | (441 655) | 536 | (440 637) | −8.0 | (−4, −12) | <0.001 | 0.461 |
| HV impedance (Ω) | 282 | 65 | (51, 77) | 66.5 | (50, 77) | 0.5 | (1, 0) | 0.178 | 84 | 51 | (47, 62) | 51.5 | (48, 61) | −0.5 | (0.5, −1) | 0.390 | 0.453 |
| Left ventricular | |||||||||||||||||
| Amplitude (mV) | 26 | 17.8 | (10, 25) | 16.85 | (11, 25) | 0.1 | (0.95, −0.9) | 0.887 | 17 | 14.1 | (10, 18) | 15 | (10, 18) | −0.2 | (0.51, −0.81) | 0.629 | 0.617 |
| Threshold (V) | 96 | 1.05 | (0.75, 1.5) | 1.1 | (0.75, 1.5) | 0.1 | (0.2, 0.02) | 0.015 | 44 | 1.00 | (0.75, 1.5) | 1.00 | (0.75, 1.25) | −0.1 | (0.03, −0.35) | 0.123 | 0.003 |
| Impedance (Ω) | 92 | 716 | (563 852) | 703 | (549 858) | −15.5 | (−6, −25) | 0.002 | 45 | 722 | (494 977) | 689 | (523 955) | −13.0 | (0, −26) | 0.058 | 0.266 |
Comparisons between MR-conditional and non-MR conditional lead groups are made as comparisons of percentage change to avoid baseline differences in absolute measurements. The number of lead comparisons is smaller than the number of total patients and depends on the number of leads implanted, variable underlying rhythm, variable pulse width, device, and the presence of atrial fibrillation. In these cases, there was no clinically significant change on interrogation. P-values are for pre- vs. post-comparisons and for the comparison of changes post-MRI between MR-conditional and non-MR conditional leads (between groups). Statistically significant comparisons shown in bold (p<0.05).
MR, magnetic resonance; MRI, magnetic resonance imaging.
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