IMPORTANT NOTICE FOR
BiPAP ASV (SERVO) PATIENTS
Release Date: June 15, 2015
A recent clinical trial involving the use of BiPAP ASV
(auto-SV/Servo) PAP machines has revealed the potential risk of adverse outcomes/possible harm to patients with
congestive heart failure; specifically, patients who had an ejection fraction (this is a measurement of the
strength of your left ventricle) of less than or equal to 45% were felt to be at increased risk for adverse cardiac
events, cardiac arrhythmias (ventricular tachycardia), possible sudden cardiac death, etc. This may represent
a statistical anomaly. The actual significance of this finding is not entirely clear at this point in time, however
to err on the side of safety, we are recommending discontinuation of the use of an auto-SV machine (Servo-PAP)
machine in all patients that have evidence of congestive heart failure with an ejection fraction less than or equal
to 45%, the normal being greater than 55%.
What You Should Do
Stop using your BIPAP ASV
Contact our office at 586-445-5995 to schedule
an office visit with our Sleep physician as soon as possible. Our Sleep physician will determine at the
time of the office visit whether it is safe for you to start using your device again or consider an
- If you had a recent echocardiogram (a test to
check your heart function) within the last 2 years, please provide our office with a copy of the
A letter by ResMed, one of the major manufacturers of
the auto-SV machine, detailing the above and outlining the risks involved with using this particular machine by
patients with congestive heart failure, can be viewed here. If you have any questions
or concerns please do not hesitate to contact one of our Sleep physicians.
& CRITICAL CARE ASSOCIATES, P.C.