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Copyright ©ERS Journals Ltd 2005
Improvement in Cheyne-Stokes respiration following cardiac resynchronisation therapy
Dept of Medicine, St. Michael's Hospital, University of Toronto, Toronto, Canada.
CORRESPONDENCE: P. J. Hanly, 1421 Health Sciences Center, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada. Fax: 1 4032836151. E-mail: phanly@ucalgary.ca
Keywords: Cardiac resynchronisation therapy, Cheyne-Stokes respiration
Received: August 10, 2004
Accepted March 7, 2005
The effect of standard cardiac resynchronisation therapy (CRT) on the severity of Cheyne-Stokes respiration (CSR) in patients with congestive heart failure was studied. It was hypothesised that CRT, through its known beneficial effects on cardiac function, would stabilise the control of breathing and reduce CSR.
Twenty-eight patients who were eligible for CRT and receiving optimised medical treatment for congestive heart failure were referred for overnight polysomnography, including monitoring of thoracic and abdominal movements to identify CSR and obstructive sleep apnoea events. Patients underwent repeat polysomnography after 6 months of CRT to re-evaluate sleep quality and sleep-disordered breathing.
Twelve of the 28 patients had significant CSR (43%); 10 patients had a successful implantation and underwent repeat polysomnography a mean±SD 27±7 weeks after continuous biventricular pacing. Six of the 10 patients experienced a significant decrease in CSR severity following CRT, associated with correction of congestive heart failure-related hyperventilation and hypocapnia. Circulation time, oxygen saturation, frequency of obstructive apnoeas and sleep quality did not change.
In conclusion, cardiac resynchronisation therapy is associated with a reduction in Cheyne-Stokes respiration, which may contribute to improved clinical outcome in patients treated with cardiac resynchronisation therapy.
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