Objective: The interplay between arousals and respiratory events during Cheyne-Stokes respiration (CSR) with central sleep apnea (CSA) in heart failure (HF) patients is still not fully understood. We investigated the temporal relationship between arousals and CSR-CSA. Methods: Episodes of CSR-CSA during sleep stages N1-N2 were analyzed in 22 HF patients with an apnea-hypopnea index ≥15/h, dominant CSA and central apnea index ≥5/h. For each CSR-CSA cycle (apnea + hyperpnea), we determined the onset (ARonset, relative to hyperpnea onset) and duration of detected arousals. Results: Arousals (N = 2348) mostly occurred within the first half of the hyperpneic phase (42.6%, ARonset = 10.6 ± 2.1 s; duration = 10.6 ± 5.2 s) or close to hyperpnea onset (21.5%, ARonset = −0.1 ± 0.6 s; duration = 13.9 ± 5.4 s). Within-apnea arousals were less frequent (12.4%, ARonset = −16.0 ± 4.7 s; duration = 3.8 ± 1.4 s). The proportion of CSR-CSA cycles without any hyperpnea-related arousal was 27.5 ± 18.2%. Hyperpnea-related arousability (total number of hyperpneic arousals/total duration of hyperpneas) and apnea-related arousability were 63.4 ± 21.0/h and 23.8 ± 16.9/h, respectively (p < 0.0001). Conclusion: During CSR-CSA, a significant proportion of arousals occur at hyperpnea onset, indicating a low arousal threshold. Hyperpneic arousals are not essential for CSR-CSA. Arousability markedly increases during hyperpneas, likely due to the concurrent increase in chemoreceptor stimulation. Significance: This study extends current knowledge on the interplay between sleep instability and respiratory events during CSR-CSA.

Temporal relationship between arousals and Cheyne-Stokes respiration with central sleep apnea in heart failure patients

Pinna G. D.;Terzaghi M.;
2018-01-01

Abstract

Objective: The interplay between arousals and respiratory events during Cheyne-Stokes respiration (CSR) with central sleep apnea (CSA) in heart failure (HF) patients is still not fully understood. We investigated the temporal relationship between arousals and CSR-CSA. Methods: Episodes of CSR-CSA during sleep stages N1-N2 were analyzed in 22 HF patients with an apnea-hypopnea index ≥15/h, dominant CSA and central apnea index ≥5/h. For each CSR-CSA cycle (apnea + hyperpnea), we determined the onset (ARonset, relative to hyperpnea onset) and duration of detected arousals. Results: Arousals (N = 2348) mostly occurred within the first half of the hyperpneic phase (42.6%, ARonset = 10.6 ± 2.1 s; duration = 10.6 ± 5.2 s) or close to hyperpnea onset (21.5%, ARonset = −0.1 ± 0.6 s; duration = 13.9 ± 5.4 s). Within-apnea arousals were less frequent (12.4%, ARonset = −16.0 ± 4.7 s; duration = 3.8 ± 1.4 s). The proportion of CSR-CSA cycles without any hyperpnea-related arousal was 27.5 ± 18.2%. Hyperpnea-related arousability (total number of hyperpneic arousals/total duration of hyperpneas) and apnea-related arousability were 63.4 ± 21.0/h and 23.8 ± 16.9/h, respectively (p < 0.0001). Conclusion: During CSR-CSA, a significant proportion of arousals occur at hyperpnea onset, indicating a low arousal threshold. Hyperpneic arousals are not essential for CSR-CSA. Arousability markedly increases during hyperpneas, likely due to the concurrent increase in chemoreceptor stimulation. Significance: This study extends current knowledge on the interplay between sleep instability and respiratory events during CSR-CSA.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/1372190
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