Pulmonary & Critical Care Associates, P.C.



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 Next

  • Stop using your BIPAP ASV device.

  • 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 alternative option.

  • 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 results.

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.



We have
4 locations throughout southeast lower Michigan

Shelby Township
50505 Schoenherr Road

Suite 290
Shelby Twp., MI 48315
Phone: 586-314-0080
Fax: 586-731-6253
     >>  Map  << 

St. Clair Shores
25319 Little Mack
St. Clair Shores, MI 48081
Phone: 586-772-5550
Fax: 586-772-1706
>>  Map  <<

Sterling Heights
44344 Dequindre
Suite 410
Sterling Heights, MI 48314
Phone: 586-262-5100
Fax: 586-262-5096
      >> Map <<

25689 Kelly Road
Suite 100
Roseville, MI 48066
Phone: 586-445-5995
Fax: 586-445-5977
 >> Map <<