1. The obesity hypoventilation syndrome
Amy L. Olson, MD, Clifford Zwillich, MD, MACP 
The American Journal of Medicine 
Volume 118, Issue 9, Pages (September 2005)
DOI: /j.amjmed
Copyright © 2005 Elsevier Inc. Terms and Conditions

2. Figure 1
The possible interactions among impaired respiratory mechanics, abnormal ventilatory drive, sleep-disordered breathing, and neurohormonal insensitivity to leptin that lead to sustained daytime hypercapnia in obese patients. OSAHS, obstructive sleep apnea- hypopnea syndrome; SHVS, sleep hypoventilation syndrome.
The American Journal of Medicine  , DOI: ( /j.amjmed )
Copyright © 2005 Elsevier Inc. Terms and Conditions

3. Figure 2
The vicious cycle of obesity hypoventilation syndrome (see text for further explanation). OHS, obesity hypoventilation syndrome; OSAHS, obstructive sleep apnea-hypopnea syndrome.
The American Journal of Medicine  , DOI: ( /j.amjmed )
Copyright © 2005 Elsevier Inc. Terms and Conditions