Mixed apneas are characterized by absent respiratory effort and airflow in the first section of the event and respiratory effort without airflow in the later portion [1].
Proposed Mechanism:
An initial obstructive apnea is followed by a post-apnea hyperpnea/hyperventilation once the upper airway opens. Carbon dioxide is blown off (hypocapnia), and CO2 levels drop below the apneic threshold at the termination of the obstructive apnea.
The subsequent apneic event starts as central apnea until the CO2 level rises, reaching the apneic threshold, and respiratory effort resumes [2].
References:
Older age is recognized as a risk factor for obstructive sleep apnea.[1] But why? Suspected…
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Although rare, the differential diagnosis of hypoventilation and hypercapnia respiratory failure includes hypothyroidism. It is…
B-type natriuretic peptide (BNP) is a hormone created in response to cardiac wall stretch due…
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