Won - Figure 51
Summary (Continued)
FIG. 51: This Figure summarizes the commonalities and differences between CSA that is opioid-induced and CSA that is treatment related. TE-CSA is relatively rare, and more often than not it tends to resolve by itself over time. Op-CSA, on the other hand, is quite common in chronic opioid users and should be looked for.
The polysomnographic features of both are slightly different. Ataxic breathing occurs more commonly during Op-CSA. In terms of risk factors, for Op-CSA the dose of the opioid increases the severity; women seem to be more frequently affected, as well as patients with lower BMIs.
Patients with lower BMIs also tend to be more affected with TE-CSA, but it is men who are at higher risk of TE-CSA. There are many comorbidities that appear to predispose to TE-CSA. High loop gain may be part of or the only reason for Op-CSA, as well as TE-CSA, but in Op-CSA there is the added complexity of a respiratory depressive effect, and in TE-CSA the PAP response must be considered.
In terms of treatment recommendations in Op-CSA ,CPAP therapy should be avoided, as CPAP may worsen SBD. Instead, physicians should try BiPAP ST, or ASV therapy. In TE-CSA, on the other hand, the majority of patients will resolve on CPAP therapy, which is the primary intervention recommended. If CPAP fails, ASV or BiPAP ST can be tried, but BiPAP without a backup rate should be avoided.
The clinical significance of both of these syndromes remains unknown. While we search for optimal therapies for these different breathing patterns, we do not know whether treatment is advantageous. If we learned anything from the SERVE-HF study,[12] it was that normalizing breathing during sleep in certain conditions is not always beneficial. Thus what are needed are long-term outcome studies that reveal whether treating these types of CSAs are beneficial. It might be that the situation is the opposite, that there is a survival advantage to high loop gain and some metabolic advantage for the fluctuating PCO2 and PO2 levels. At this time the consensus favors treating the breathing disorder, especially if the patient is symptomatic, and there is some evidence to guide us when choosing that treatment and that PAP modality, while we await further information.
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