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Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_4538_Библиотеки_им_академика_М_И_Перельмана

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Table 2.1 PALM classication scale
PALM category 1 Severe anatomical
decit
2 Moderate
anatomical decit
2a Minor nonanatomical
2b Nonanatomical
3 Minor anatomical
decit
Can be used to classify patients and as such dene optimal treatment options for the individual OSA patient [5]
Category cut-off
P
> +2cm H2O Anatomical decit. Anatomical or
crit
2cm H2O<P +2cm H2O
vulnerability
vulnerability
P
< 2cm H2O
crit
<
crit
Denition
mechanical intervention advised (e.g., CPAP)
Potential candidate for combination therapy
Anatomic interventions advised (e.g., CPAP, MAD, positional therapy)
Combination of anatomic and nonanatomical interventions (e.g., MAD + oxygen)
Nonanatomical interventions advised (e.g., oxygen)
S. Op de Beeck et al.
when the pharyngeal muscles are passive (i.e., not additionally activated). By deni­tion, active collapsibility is the ventilation that can be achieved at maximal ventila­tory drive (i.e., when ventilatory drive is at the arousal threshold and pharyngeal muscles are activated as much as possible). The upper airway gain, reecting upper airway muscle activation, is the slope of the line connecting V
passive
and V
active
. Stable breathing (orange) is achieved if the line representing “1/loop gain” and the line representing “upper airway gain” intersect. However, stable breathing can only be achieved if the ventilatory drive associated with this point is situated before (to the left of) the arousal threshold.
The goal in treating obstructive sleep apnea is to modify one or more of the traits (loop gain, arousal threshold, passive collapsibility or upper airway muscle com­pensation) to allow stable breathing without reaching the arousal threshold.
A potential patient classication scale is dened as the PALM scale [5] based on four pathophysiological traits: P
, Arousal threshold, Loop gain and Muscle
crit
responsiveness (Table2.1). According to this scale, OSA patients can be subdivided into three main categories The major determinant to dene the category of each individual patient is the upper airway collapsibility, based on P
[5]. Patients with
crit
moderate anatomical decits can be further subdivided into patients without non­anatomical vulnerability (group 2a) and patients with nonanatomical vulnerability (group 2b). Based on this classication scheme, optimal treatment actions can be dened for individual patients [5].
2.8 Association Between Treatment Outcome
andPathophysiological Traits
While the different traits will interact as shown in Fig.2.13, the relative importance of each trait affects treatment outcome of different OSA treatment modalities (Table2.2).
Site, pattern
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Table 2.2 The optimal treatment for OSA patients depends on the underlying pathophysiological trait distribution. Colored elds represent the most important traits for each OSA treatment. Importance of each trait is reected in the height of the colored bars
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Upper airway
collapsibility
Continuous
Positive Airway
Pressure (CPAP)
Mandibular
Advancement
Devices (MAD)
Hypoglossal
Nerve
Stimulation
Upper Airway
Surgery
Drug Therapy
and degree of
upper airway
collapse
Ventilatory
control stability
Muscle
responsiveness
Arousal
threshold
2.8.1 Continuous Positive Airway Pressure (CPAP)
CPAP treatment is characterized by a high efcacy across different patient cohorts. However, limited adherence might hamper overall efciency. Assessing the under­lying pathophysiology of patients and its associations with CPAP adherence might increase overall efciency. A recent study on patients with coronary artery disease showed that a greater adherence to CPAP was found in patients with a higher arousal threshold and average muscle compensation [61].
2.8.2 Mandibular Advancement Devices (MAD)
Regarding MAD treatment, all pathophysiological, both anatomical and physiologi­cal, traits play a role in selecting the best candidates.
Regarding the site of upper airway collapse, an increase in velopharyngeal cross­sectional area with MAD correlates with treatment response [6266]. Furthermore, an improvement in upper airway patency during DISE using a simulation bite pre­dicts MAD response [63]. Recently, a posteriorly located tongue during natural sleep was also found to be associated with MAD treatment outcomes [67]. Similarly, tongue base collapse during DISE was found to be associated with increased odds of being a MAD responder. In contrast, CCCp and complete laterolateral oropha­ryngeal collapse were associated with increased odds for deteriorating during MAD treatment [68].
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Regarding upper airway collapsibility, MAD treatment response is associated with a lower pharyngeal collapsibility, reected in a lower P
and lower optimal
crit
CPAP level [67, 6972]. Using nite element modeling and during clinical studies, mandibular advancement was shown to lower P
in a dose-dependent way [21, 23,
crit,
24, 7377].
Loop gain affects both upper airway surgery outcomes and MAD treatment out­comes. For both treatment modalities, a lower loop gain, reecting a more stable ventilatory control system, was associated with an increased probability of treat­ment response [52, 69].
Overall, using the noninvasive technique to assess the pathophysiological traits based on baseline PSG signals, a low loop gain proved to be the most critical physi­ological parameter [72]. However, lower collapsibility, higher arousal threshold, lower response to arousal and weaker muscle compensation were also favorable determinants [71].
2.8.3 Hypoglossal Nerve Stimulation
Complete concentric collapse at the level of the palate (CCCp), assessed during DISE, is a negative endotype and formal exclusion criterion for respiration­synchronized upper airway stimulation treatment [78, 79]. Furthermore, it has been shown that patients with complete anteroposterior or laterolateral palatal or epiglot­tic collapse might have increased odds for therapy failure [80].
Regarding the other traits, a recent study using the noninvasive methods described earlier showed that patients with a higher arousal threshold had increased odds of being a responder to HGNS treatment after 1 year [81]. Combining arousal thresh­old with the other physiological traits into one model showed that patients with a nonanatomical problem predisposing OSA (low arousal threshold, high loop gain, low pharyngeal compensation, mild collapsibility) tend to be nonresponders to HGNS treatment.
2.8.4 Upper Airway Surgery
Assessing the site of upper airway collapse is paramount before performing upper airway surgery. Therefore, DISE is routinely performed on each surgical candidate to dene and ne-tune the treatment plan [82, 83].
In contrast to HGNS or MAD treatment, maxillomandibular advancement (MMA) surgery was shown not to be affected by the presence of CCCp. In addition, MMA tended to resolve CCCp [84].
Regarding the other traits, especially loop gain was shown to affect upper airway surgery outcomes. A lower loop gain was associated with an increased probability of treatment response [52, 69].
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2.8.5 Pharmacological Treatment Options
Numerous drugs have been investigated, such as antidepressants, diuretics, antihy­pertensives, antiemetics, stimulants and sedatives, with some of them showing interesting properties [85].
Acetazolamide, a carbonic anhydrase inhibitor, may enhance respiratory drive by inducing metabolic acidosis, thus improving loop gain [86]. Other drugs have also been repurposed for the treatment of OSA.Spironolactone may improve upper airway collapsibility by reducing uid retention and edema [87]. Several studies tried to mitigate OSA by modifying the activity of dilatory upper airway muscles. Initially, it was thought that sleep-related changes in muscle activity were primarily due to the withdrawal of serotonin at the hypoglossal neurons [88, 89]. However, more recent data suggest that drops in noradrenaline levels also play a key role. Therefore, noradrenergic stimulants, such as protriptyline and desipramine, can increase muscle activity and reduce upper airway collapsibility [90, 91].
A nal potential target is the arousal threshold. Studies have indicated that seda­tives such as eszopiclone and zolpidem increase the arousal threshold by 20–30% [9295].
Regarding oxygen therapy, a correlation between response and lower collaps­ibility at baseline was found [96]. Furthermore, oxygen therapy lowers loop gain [47]. Pharyngeal muscle compensation affects the response to oxygen therapy; patients with a higher muscle compensation show increased response [96].
As OSA is a multifactorial disease, recent studies have looked at combinations of drugs. One of the most exciting studies in this eld demonstrated that the combi­nation of atomoxetine (noradrenergic) and oxybutynin (antimuscarinic) lowers the AHI by 63% [97]. This improvement was attributed to drastic changes in collaps­ibility and muscle compensation [98]. Notably, both drugs were ineffective when administered separately. Another exciting combination, eszopiclone and supple­mental oxygen reduced the AHI by 43% via improvements in arousal threshold and loop gain [99].
2.9 Conclusion
Overall, we can conclude that assessment of OSA pathophysiology holds promise for playing a pivotal role in coming to precision medicine for obstructive sleep apnea patients. While until recently, these traits could only be assessed using rigor­ous, often invasive, and overnight measurements. However, the newly developed noninvasive techniques can make this information available in routine clinical practice.
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Take-Home Message
• There are ve critical pathophysiological OSA traits: site(s) and pattern(s) of
upper airway collapse, upper airway collapsibility, ventilatory control stability
(loop gain), muscle responsiveness, and arousal threshold.
• All these traits can be measured using a gold standard technique involving over-
night measurements and/or upper airway pressure manipulations.
• OSA pathophysiological traits are helpful for treatment selection purposes.
Besides DISE, especially the non-invasive techniques, e.g., based on sleep study
data, hold promise as a patient selection tool.
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