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26 Dermatologic Changes Related toPatients withObstructive 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 inammation associated with OSA and inammatory
skin disease (best exemplied 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
decient wound healing and may contribute to diabetic ulcers becoming
infected.
3. Mechanical obstruction of the upper airways may be due to obesity and other
specic 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 benets 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 inammatory
physiopathology, and the great benet 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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– systemic bi-directional inammation associated with OSA and inammatory
skin disease (best exemplied 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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27
CamiloSilvaFroján, JuanaKarinaZapataCárdenas,
SaioaEcheverríaAndueza, andPatriciaAndradaÁlvarez
27.1 Complete Blood Cell Count
Complete blood cell count (CBC) is a medical laboratory test widely available, easy
to obtain, and cheap. Systemic inammation 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.
Inammation can shorten erythrocytes survival, and elevated RDW has been
described in OSA patients.
Nevertheless, this fact may be related to age or obesity. A signicant 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
inammation [2]. Hemoglobin and hematocrit are signicantly 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
469

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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 inammation 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 signicantly 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 signicant reductions in the MPV
values in patients with severe OSA [7]. However, MPV can be inuenced by many
factors such as age, gender, or blood sample processing, reducing the specicity 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 inammation 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, inammation, and cardiovascular risk are interconnected. It is well known
that chronic vascular inammation is related to the development of atherosclerosis,
which is now considered an inammatory disease. In addition to activating the sympathetic nervous system and derangement in endothelial function, OSA patients
have a higher expression of systemic inammatory markers [11]. The proinammatory 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 proinammatory state.

27 Laboratory Parameters Changes
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C-reactive protein (CRP), produced in the liver through interleukin-6 (IL-6)
activity, is one of the most used inammatory 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 conrm this relationship, suggesting that the association between OSA and
CRP levels is inuenced by other factors like obesity or diabetes [13].
IL-6 is an important proinammatory 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 proinammatory state. Several meta-analyses conrm an
increase in IL-6in patients with OSA [14].
Tumor Necrosis Factor Alpha (TNF-α) is a proinammatory 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 signicant
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 inammation
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 inammatory 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
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