AI Article Synopsis
- The study highlights a significant delay (59 ± 4 ms) between the EGM and ECG channels when using the Medtronic 2090 programmer, compared to a much shorter delay (4 ± 3 ms) with the St Jude programmer.
- The researchers measured timing discrepancies in CRT patients, discovering a larger change in qLV between implant and 6-month follow-up in those using Medtronic (60 ± 27 ms) versus St Jude (2 ± 28 ms).
- The findings suggest that the Medtronic analyzer is not ideal for accurate timing measurements between QRS complexes and EGM signals due to this delay.
Article Abstract
Background: Following an observation of pacing markers being placed after the beginning of the paced QRS complex when using the analyzer module 2290 of the Medtronic 2090 programmer, we decided to determine the delay between the EGM and the ECG channels and comparing it to the St Jude Merlin® programmer.
Methods: We obtained ECG lead I simultaneously from both the ECG cable and by attaching the atrial clamps of the EGM cable on the left and right shoulder. We were then able to directly measure any delay. Then we compared measurements of start QRS to LV sense (qLV) in patients implanted with CRT in the last year where we had data on qLV at implant and at 6-month follow-up. At implant qLV was measured by the analyzer modules and at 6-month follow-up, it was measured in the pacing devices.
Results: We found that the delay between the EGM and ECG channels was 59 ± 4 ms in the Medtronic analyzer (ECG first) and 4 ± 3 ms in the St Jude analyzer (EGM first). In 16 CRT patients where the Medtronic analyzer had been used, the difference between qLV at implant and qLV at 6 months was 60 ± 27 ms whereas this difference was 2 ± 28 ms in 34 CRT patients where the St Jude analyzer had been used (p < 10).
Conclusion: There is a delay of about 60 ms between the EGM and ECG channels of 2290 analyzer module of the Medtronic 2090 programmer making it unsuitable for determining timing measurements between QRS and EGM.
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| http://dx.doi.org/10.1016/j.jelectrocard.2019.11.001 | DOI Listing |
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