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26 Dermatologic Changes Related toPatients withObstructive Sleep Apnea
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26.4 Conclusion
In conclusion, skin diseases have various epidemiologic associations with OSA.However, four etiopathogenic mechanisms that may explain the relationship of many dermatologic processes with OSA are as follows:
1. Systemic bidirectional inammation associated with OSA and inammatory
skin disease (best exemplied by psoriasis) in each condition exacerbates the other.
2. Obesity itself and the conditions associated with obesity (such as type 2 diabe-
tes) in which skin manifestations and concurrent OSA are frequently observed. Type 2 diabetes is an interesting example as it is believed that OSA induces decient wound healing and may contribute to diabetic ulcers becoming infected.
3. Mechanical obstruction of the upper airways may be due to obesity and other
specic conditions such as lipodystrophy in which fat deposits accumulate adja­cent to the airways.
4. The hypoxia related to OSA may be associated with skin cancer, particularly
melanoma. The intermittent hypoxia may produce proliferative neovascular sig­nals which favor tumor growth. Joining these mechanisms is the autonomic dys­function due to OSA.Excessive sympathetic ow toward the skin may accelerate aging and uncover or exacerbate preexisting skin disorders.
Concerning the secondary effects, continuous positive pressure in the airways may be locally associated with skin irritation, folliculitis, rosacea, irritative derma­titis, seborrheic dermatitis, and, very rarely, contact allergic dermatitis. However, the benets of CPAP clearly outweigh the risks.
Many of these associations are clear and have been well studied and documented. However, more research is needed to describe better the mechanisms underlying the clinical associations between skin diseases and OSA and the potential therapeutic effects on skin diseases when treating OSA with CPAP or other interventions.
Furthermore, it is likely that in everyday clinical practice, specialists come across OSA in complex dermatologic patients who have one or more medical or psychiat­ric disorders, which are also associated with a greater risk for OSA.
Finally, dermatologists should be aware of the possible impact of OSA on the course of skin diseases, especially those associated with a mainly inammatory physiopathology, and the great benet offered by CPAP for the integumen­tary system.
Take-Home Messages
• Skin disorders are a common comorbidity of sleep apnea
• Sleep apnea itself may deteriorate the skin.
• Four ethiopathogenic mechanisms may explain the relationship of many derma-
tologic processes with OSA:
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P. Redondo
– systemic bi-directional inammation associated with OSA and inammatory
skin disease (best exemplied by psoriasis and atopic dermatitis) in which each condition exacerbates the other.
– obesity itself and the conditions associated with it (diabetes, hidradenitis sup-
purativa, polycystic ovary syndrome); – Mechanical obstruction of the upper airways – Hypoxia related to OSA may be associated with skin cancer, in particular
melanoma.
• Many of these associations are clear and have been well studied and documented.
• More research is needed to describe better the mechanisms underlying the clini­cal associations between skin diseases and OSA and the potential therapeutic effects on skin diseases when treating OSA with CPAP or other interventions.
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116. Matin A, Bliwise DL, Wellman JJ, Ewing HA, Rasmuson P.Resolution of dyshidrotic derma­titis of the hand after treatment with continuous positive airway pressure for obstructive sleep apnea. South Med J. 2002;95:253–4.
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CamiloSilvaFroján, JuanaKarinaZapataCárdenas, SaioaEcheverríaAndueza, andPatriciaAndradaÁlvarez
27.1 Complete Blood Cell Count
Complete blood cell count (CBC) is a medical laboratory test widely available, easy to obtain, and cheap. Systemic inammation and altered platelet function are two mechanisms involved in the increased cardiovascular risk associated with obstruc­tive sleep apnea (OSA). Through a hemogram, we can obtain a series of parameters related to these two physiopathological mechanisms. Red cell distribution width (RDW) is a measurement of the range in the volume and size of the erythrocytes. Inammation can shorten erythrocytes survival, and elevated RDW has been described in OSA patients.
Nevertheless, this fact may be related to age or obesity. A signicant positive correlation between RDW and apnea–hypopnea index (AHI) and oxygen desatura­tion index (ODI) has been found. Furthermore, RDW might be used as a marker of the response to continuous positive airway pressure (CPAP) treatment [1].
It is well known that hypoxia stimulates erythropoiesis and is associated with inammation [2]. Hemoglobin and hematocrit are signicantly increased in patients with severe OSA, but values remain within the normal clinical range. A negative
C. S. Froján (*) Department of Endocrinology & Nutrition, Clínica Universidad de Navarra, Pamplona, Spain
Centro de Investigación Biomédica en Red-Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Pamplona, Spain
Obesity and Adipobiology Group, Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain e-mail: csilvafr@unav.es
J. K. Z. Cárdenas · S. E. Andueza · P. A. Álvarez Department of Endocrinology & Nutrition, Clínica Universidad de Navarra, Pamplona, Spain e-mail: jzapatac@unav.es; secheverriaa@unav.es; pandrada@unav.es
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2023 P. M. Baptista et al. (eds.), Obstructive Sleep Apnea,
https://doi.org/10.1007/978-3-031-35225-6_27
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association exists between hemoglobin, hematocrit, mean corpuscular volume (MCV), and mean peripheral oxygen saturation (SpO2) [3]. One possible explana­tion are the high blood levels of erythropoietin (EPO) seen in OSA patients [4]. Atrial natriuretic peptide (ANP) is secreted by the cardiac muscle cells in response to an expanded extracellular uid, and its natriuretic effect can contribute to hemo­concentration. The atrial natriuretic peptide is increased in untreated OSA patients and levels decrease during treatment with CPAP, suggesting a possible role in increased hemoglobin and hematocrit levels due to hemoconcentration [5].
Platelets play a crucial role in hemostasis and thrombosis. Platelet activation can increase blood viscosity which mediates between systemic inammation and car­diovascular risk. Several platelet indices are usually part of the hemogram that can be used as markers of activity. Mean platelet volume (MPV) refers to the average size of circulating platelets and is associated with several cardiometabolic risk fac­tors and cardiovascular events.
MPV is signicantly increased in patients with OSA and could be used as a marker to predict cardiovascular disease in this group [6]. Furthermore, one study showed that six months of CPAP therapy causes signicant reductions in the MPV values in patients with severe OSA [7]. However, MPV can be inuenced by many factors such as age, gender, or blood sample processing, reducing the specicity of this parameter [8].
Platelet distribution width (PDW) refers to the variance in the size of circulating platelets. High PDW has been correlated with AHI in OSA, and CPAP can decrease this parameter [9].
Activated platelets can interact with leukocytes and neutrophils forming aggre­gates. Also, activated platelets can stimulate neutrophils, promoting the formation of neutrophil–lymphocyte complexes. Among other situations, the neutrophil to lymphocyte ratio (NLR) and platelet to lymphocyte ratio (PLR) increase in sys­temic inammation and cardiovascular diseases. The PLR value in OSA patients has been found to be less than the control group, showing an inverse correlation with AHI.In the same study, NLR increased as the time spent during the sleep with a lowering of arterial oxygen saturation below 90% [10].
C. S. Froján et al.
27.2 Inflammatory Markers
OSA, inammation, and cardiovascular risk are interconnected. It is well known that chronic vascular inammation is related to the development of atherosclerosis, which is now considered an inammatory disease. In addition to activating the sym­pathetic nervous system and derangement in endothelial function, OSA patients have a higher expression of systemic inammatory markers [11]. The proinamma­tory state associated with OSA is related to intermittent hypoxia, since cycles of hypoxia and reoxygenation are similar to ischemia-reperfusion injury which pro­motes oxidative stress [12]. Therefore, it is not easy to determine whether OSA itself or the obesity usually associated is responsible for this rise since obesity is associated with a proinammatory state.
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C-reactive protein (CRP), produced in the liver through interleukin-6 (IL-6) activity, is one of the most used inammatory markers in clinical practice, and its elevated levels have been associated, among others, with diabetes or cardiovascular disease. Several studies have reported increased levels of CRP in OSA patients, and these levels tend to decrease with effective treatment. However, other studies have failed to conrm this relationship, suggesting that the association between OSA and CRP levels is inuenced by other factors like obesity or diabetes [13].
IL-6 is an important proinammatory cytokine that induces the synthesis of all acute-phase proteins, including CRP.Other biological activities of IL-6 are prolif­eration and differentiation of lymphocytes or immunoglobulin secretion. Similar to CRP, elevated levels of IL-6 are associated with higher cardiovascular risk through the propitiation of a proinammatory state. Several meta-analyses conrm an increase in IL-6in patients with OSA [14].
Tumor Necrosis Factor Alpha (TNF-α) is a proinammatory cytokine secreted by immune cells and mediates the pathogenesis of several diseases such as cancer, atherosclerosis, or autoimmune diseases. A recent meta-analysis found a signicant association between OSA and elevated TNF-α levels in adults. In this investigation, TNF-α levels were correlated with OSA severity [15].
Fibrinogen is a glycoprotein involved in the thrombogenesis process. Fibrinogen also acts as an acute-phase protein, and high levels are associated with inammation and cardiovascular disease. Recently two meta-analysis showed that circulating brinogen levels are elevated in patients with OSA [16] and that CPAP treatment can reduce plasma brinogen levels in OSA patients, suggesting that elevated brinogen levels may be a link between OSA and cardiovascular disease [17].
Other inammatory markers such as interleukin 8 (IL-8), intercellular adhesion molecule (ICAM), vascular cell adhesion molecule (VCAM), and selectins have also been found to be increased in patients with OSA [11].
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27.3 Glucose Metabolism
Type 2 diabetes is associated with an increased risk of developing OSA.Patients with type 2 diabetes (T2D) have an increased adjusted incidence rate ratio (1.48) of OSA compared with those without [18]. However, positive airway pressure (PAP) therapy has failed to improve glycemic control in type 2 diabetes patients [19]. One mechanism that may mediate this association is insulin resistance, which is inde­pendently associated with OSA [20].
Diabetes mellitus is a heterogeneous disease of glucose metabolism character­ized by impaired ability to produce or respond to insulin. Diabetes is characterized an elevated blood glucose level that, sustained over time, can be associated with the development of microvascular and macrovascular complications (retinopathy, nephropathy, neuropathy, and vascular disease). The most common form of diabetes is type 2 diabetes (T2D), which occurs more frequently in middle-aged and elderly people. There are several pathophysiological factors involved in T2D, among which the presence of obesity and insulin resistance stands out. Diabetes may be