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MAI) Mosul for Anesthesia & ICU)

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MAI) Mosul for Anesthesia & ICU)

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    Hyperventilation Syndrome

    yagocom
    yagocom
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    عدد الرسائل : 213
    العمر : 52
    تاريخ التسجيل : 2008-07-26

    Hyperventilation Syndrome Empty Hyperventilation Syndrome

    Post by yagocom Wed Mar 14, 2012 9:57 pm

    Hyperventilation syndrome (HVS) represents a relatively common ED presentation that is readily recognized by most clinicians. However, the underlying pathophysiology has not been clearly elucidated.

    As classically defined, hyperventilation syndrome is a condition in which minute ventilation exceeds metabolic demands, resulting in hemodynamic and chemical changes that produce characteristic dysphoric symptoms. Inducing a drop in arterial pCO2 through voluntary hyperventilation reproduces these symptoms. Recently, however, this model has been challenged with the observation that many patients with hyperventilation syndrome do not manifest low arterial pCO2 levels during attacks. In some cases, patients with this syndrome have demonstrated altered respiratory physiology that is manifest as a slower return to baseline of the pCO2 after voluntary hyperventilation to a defined level of pCO2.

    Current thinking suggests that the syndrome might better be termed behavioral breathlessness or psychogenic dyspnea with hyperventilation as a consequence rather than as a cause of the condition. It is also recognized that some patients may be physiologically at risk of developing psychogenic dyspnea.

    Symptoms of hyperventilation syndrome and panic disorder overlap considerably, although the two conditions remain distinct. Approximately 50% of patients with panic disorder and 60% of patients with agoraphobia manifest hyperventilation as part of their symptomatology, whereas only 25% of patients with hyperventilation syndrome manifest panic disorder.

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