Chest
Clinical Investigations: Sleep and BreathingAccuracy of Monitoring for Sleep-Related Breathing Disorders in the Coronary Care Unit
Section snippets
Patients and Methods
Consecutive patients admitted to the Coronary Care Unit of Dunedin Hospital between April 1 and May 31, 2003, were invited to participate as soon as their clinical status had been satisfactorily stabilized. Inclusion criteria were as follows: diagnosis of unstable angina; acute MI; and left ventricular or congestive cardiac failure. Exclusion criteria were as follows: known diagnosis of OSA or other sleep-related disorder; or requiring ongoing supplementary oxygen therapy at the time of the
Results
There were 101 admissions to the CCU during the designated study period, of which 41 met the diagnostic criteria for inclusion in the study. Twelve patients declined to participate. Twenty-nine patients underwent the first sleep study (study 1), but complete data were available for only 26 patients. The remaining three patients were either intolerant of monitoring procedures2 or experienced chest pain during the study night.1 The final CCU admission diagnosis was MI in 14 patients (complicated
Discussion
The results of this observational study confirm that SDB is common in a highly selected group of at-risk patients who are admitted to the CCU. Using very conservative criteria for diagnosis, 12 patients (46%) were shown to have OSA and 1 had CSA at the time of their acute presentation. However, the results of the follow-up investigation showed that in a significant number of patients, the findings were transient and could not be repeated. A final diagnosis of SDB was confirmed in 5 of 26
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The study was supported by the Otago Respiratory Research Trust and the Dunedin Heart Unit Trust.
Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (e-mail: [email protected]).