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8/13/2019 Obesity Hypoventilation Syndrome (OHS)_ MedlinePlus Medical Encyclopedia
1/3
30/12/13 Obesity hypoventilation syndrome (OHS): MedlinePlus Medical Encyclopedia
www.nlm.nih.gov/medlineplus/ency/article/000085.htm
URL of this page: http://www.nlm.nih.gov/medlineplus/ency/article/000085.htm
Obesity hypoventilation syndrome (OHS)Obesity hypoventilation syndrome (OHS) is a condition in obese people in which poor breathing leads to lower oxygenand higher carbon dioxide levels in the blood.
Causes
The exact cause of OHS is unknown. The condition is believed to result from both a defect in the brain's control over
breathing, and excessive weight (due to obesity) against the chest wall. This makes it hard for a person to take a deep
breath. As a result, the blood has too much carbon dioxide and not enough oxygen. People with OHS are often tired du
to sleep loss, poor sleep quality, and chronic low blood oxygen levels (hypoxia).
Most patients with the syndrome have a form of sleep apnea. Obesity is the main risk factor.
See also: Respiratory acidosis
Symptoms
The main symptoms of OHS are due to lack of sleep and include:
Daytime sleepiness
Depression
Headaches
Symptoms of low blood oxygen level (chronic hypoxia) can also occur, such as shortness of breath or feeling tired aftevery little effort.
Exams and Tests
People with OHS are usually very overweight. A physical exam may reveal:
Bluish color in the lips, fingers, toes, or skin (cyanosis)
Reddish colored skin
Signs of right-sided heart failure (cor pulmonale), such as swollen legs or feet, shortness of breath, or feeling tire
after little effort
Tests used to help diagnose and confirm OHS include:
Arterial blood gas
Chest x-ray or CT scan to rule out other possible causes
Lung function tests (pulmonary function tests)
Sleep study (polysomnography)
Doctors can tell OHS from obstructive sleep apnea because patients with OHS have high carbon dioxide levels in the
blood when awake.
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Treatment
The treatment involves breathing assistance using special machines (mechanical ventilation). Options include:
Noninvasive mechanical ventilation (BiPAP or other modes) through a mask that fits tightly over the nose or nos
and mouth (mainly for sleep)
Breathing help through an opening in the neck (tracheostomy)
Oxygen
Other treatments are aimed at weight loss, which can reverse OHS.
Support Groups
Support groups can help patients with OHS, or their family members, adjust to the lifestyle changes needed for
treatment to be successful. Also, support groups can offer information about new treatments.
Outlook (Prognosis)
Untreated, it can lead to serious heart and blood vessel problems, severe disability, or death. Chronic sleeping problem
may also increase the chance of having a motor vehicle accident.
Possible Complications
Complications of OHS have to do with a lack of sleep, such as:
Depression, agitation, irritability
Increased risk for accidents or mistakes at work
Sexual dysfunction
OHS can also cause heart problems, such as:
Hypertension
Right-sided heart failure (cor pulmonale)
Pulmonary hypertension (high blood pressure in the lungs)
When to Contact a Medical Professional
Call your health care provider if you are very tired during the day, or have any other symptoms that suggest OHS.
Prevention
Maintain a healthy weight and avoid obesity.
Alternative Names
Pickwickian syndrome
References
Malhotra A. Disorders of ventilatory control. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa:
Saunders Elsevier; 2011:chap 86.
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30/12/13 Obesity hypoventilation syndrome (OHS): MedlinePlus Medical Encyclopedia
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Tzelepis GE, McCool FD. The lungs and chest wall diseases. In: Mason RJ, Broaddus VC, Martin TR, et al, eds.
Murray and Nadels Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 88.
Duffin J, Phillipson EA. Hypoventilation and hyperventilation syndromes In: Mason RJ, Broaddus CV, Martin TR, et al.
Murray & Nadel's Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa:Saunders Elsevier; 2010:chap 78.
Update Date: 8/30/2012
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine,
University of Washington School of Medicine. Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of
Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD,
MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
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