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ABSTRACT: Background
Insertable cardiac monitors (ICMs) are accepted tools in cardiac arrhythmia management. Consistent R-wave amplitude (RWA) is essential for optimal detection.Objectives
Assess RWAs with posture/activities at insertion and at 30 days.Methods
Participants (n = 90) with Confirm Rx™ ICM had RWAs measured in different postures (supine, right-side [RS], left-side [LS], sitting, and standing) and defined physical activities (including isometric push [IPUSH] and pull) at 2 time points. ICMs were inserted in 45° to sternum and parasternal orientations.Results
There were significant reductions at insertion with RS, LS, sitting, or standing vs supine (reference position) (all P < .05). At 30 days, significant changes only occurred with LS and sitting (P < .05). Sex had an effect on RWAs, with females having significant variability at insertion (supine vs RS, LS, sitting, standing, and IPUSH; all P < .05). Males showed large RWA interpatient variabilities but minimal differences between positions vs supine. At 30 days, RS, LS, and sitting positions remained significant for females (P < .05), while in males RWAs were higher than at insertion for most postures and activities. The orientation 45° to sternum had consistently higher RWAs vs parasternal orientation at both time points (P < .0001). In females, ICM orientation had no significant effect on RWAs; however, in males the 45° to sternum produced higher RWAs. ICM movement from the insertion site showed no correlation with RWA changes.Conclusion
The mean RWAs were higher at 30 days with less interparticipant and interpostural variability; males had higher RWAs compared to females; 45° to sternum orientation had higher RWAs; and ICM migration from the insertion site did not affect RWAs.
SUBMITTER: Swale M
PROVIDER: S-EPMC9043368 | biostudies-literature | 2022 Apr
REPOSITORIES: biostudies-literature
Swale Matthew M Delacroix Sinny S Young Glenn G Paul Vincent V McSpadden Luke L Ryu Kyungmoo K Di Fiore David D Santos Maria M Tan Isabel I Conradie Andre A Duong MyNgan M Schwarz Nisha N Worthley Stephen S Pavia Stephen S
Cardiovascular digital health journal 20211230 2
<h4>Background</h4>Insertable cardiac monitors (ICMs) are accepted tools in cardiac arrhythmia management. Consistent R-wave amplitude (RWA) is essential for optimal detection.<h4>Objectives</h4>Assess RWAs with posture/activities at insertion and at 30 days.<h4>Methods</h4>Participants (n = 90) with Confirm Rx™ ICM had RWAs measured in different postures (supine, right-side [RS], left-side [LS], sitting, and standing) and defined physical activities (including isometric push [IPUSH] and pull) a ...[more]