Repeated exposure to transient obstructive sleep apnea-related conditions causes an atrial fibrillation substrate in a chronic rat model

• Verfasst von: Linz, Benedikt [VerfasserIn]
• Verfasst von: Hohl, Mathias [VerfasserIn]
• Verfasst von: Lang, Lisa [VerfasserIn]
• Verfasst von: Wong, Dickson W. L. [VerfasserIn]
• Verfasst von: Nickel, Alexander G. [VerfasserIn]
• Verfasst von: Torre, Carolina de la [VerfasserIn]
• Verfasst von: Sticht, Carsten [VerfasserIn]
• Verfasst von: Wirth, Klaus [VerfasserIn]
• Verfasst von: Boor, Peter [VerfasserIn]
• Verfasst von: Maack, Christoph [VerfasserIn]
• Verfasst von: Speer, Thimoteus [VerfasserIn]
• Verfasst von: Jespersen, Thomas [VerfasserIn]
• Verfasst von: Schotten, Ulrich [VerfasserIn]
• Verfasst von: Sanders, Prashanthan [VerfasserIn]
• Verfasst von: Böhm, Michael [VerfasserIn]
• Verfasst von: Linz, Dominik [VerfasserIn]
• Titel: Repeated exposure to transient obstructive sleep apnea-related conditions causes an atrial fibrillation substrate in a chronic rat model
• Verf.angabe: Benedikt Linz, Mathias Hohl, Lisa Lang, Dickson W. L. Wong, Alexander G. Nickel, Carolina De La Torre, Carsten Sticht, Klaus Wirth, Peter Boor, Christoph Maack, Thimoteus Speer, Thomas Jespersen, Ulrich Schotten, Prashanthan Sanders, Michael Böhm, Dominik Linz
• E-Jahr: 2021
• Jahr: March 2021
• Umfang: 10 S.
• Fussnoten: Gesehen am 12.08.2021
• Titel Quelle: Enthalten in: Heart rhythm
• Ort Quelle: New York, NY [u.a.] : Elsevier, 2004
• Jahr Quelle: 2021
• Band/Heft Quelle: 18(2021), 3, Seite 455-464
• ISSN Quelle: 1556-3871
• DOI: doi:10.1016/j.hrthm.2020.10.011
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Atrial fibrillation
• Sach-SW: Night-to-night variability
• Sach-SW: Obstructive sleep apnea
• Sach-SW: Rats
• Sach-SW: Substrate
• K10plus-PPN: 1766554997

Abstract

Background - High night-to-night variability in obstructive sleep apnea (OSA) is associated with atrial fibrillation (AF). Obstructive apneas are characterized by intermittent deoxygenation-reoxygenation and intrathoracic pressure swings during ineffective inspiration against occluded upper airways. - Objective - We elucidated the effect of repeated exposure to transient OSA conditions simulated by intermittent negative upper airway pressure (INAP) on the development of an AF substrate. - Methods - INAP (48 events/4 h; apnea-hypopnea index 12 events/h) was applied in sedated spontaneously breathing rats (2% isoflurane) to simulate mild-to-moderate OSA. Rats without INAP served as a control group (CTR). In an acute test series (ATS), rats were either killed immediately (n = 9 per group) or after 24 hours of recovery (ATS-REC: n = 5 per group). To simulate high night-to-night variability in OSA, INAP applications (n = 10; 24 events/4 h; apnea-hypopnea index 6/h) were repeated every second day for 3 weeks in a chronic test series (CTS). - Results - INAP increased atrial oxidative stress acutely, represented in decreases of reduced to oxidized glutathione ratio (ATS: INAP: 0.33 ± 0.05 vs CTR: 1 ± 0.26; P = .016), which was reversible after 24 hours (ATS-REC: INAP vs CTR; P = .274). Although atrial oxidative stress did not accumulate in the CTS, atrial histological analysis revealed increased cardiomyocyte diameters, reduced connexin 43 expression, and increased interstitial fibrosis formation (CTS: INAP 7.0% ± 0.5% vs CTR 5.1% ± 0.3%; P = .013), which were associated with longer inducible AF episodes (CTS: INAP: 11.65 ± 4.43 seconds vs CTR: 0.7 ± 0.33 seconds; P = .033). - Conclusion - Acute simulation of OSA was associated with reversible atrial oxidative stress. Cumulative exposure to these transient OSA-related conditions resulted in AF substrates and was associated with increased AF susceptibility. Mild-to-moderate OSA with high night-to-night variability may deserve intensive management to prevent atrial substrate development.