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13 The Dry Nose
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Fig. 13.1 Dry nose in a patient with Wegener’s disease
physiologically plausible, it has never been conrmed as the sole cause. The mechanical and functional integrity of the mucous membrane is considered a major natural defence mechanism against infection. Depending on the degree to which it dries out, mucociliary transport and even the epithelial barrier may be impaired.
Epidemiological data on the prevalence of dry nose are not available. However, in particular, when questioned, many people confess to be suf­ferers and admit to the use of numerous therapeu­tic measures, mostly ointments and sprays or nasal douches.
In old age, anatomical changes and involution atrophy of the mucosa result in an increase in such complaints as impairment of nasal breathing and dry nose, and the following phenomena may occur:
• Hanging nasal tip and shortening of the colu-
mella [6].
• Reduced mucociliary clearance [710].
• Reduction in the number of goblet cells and
elastic bres in the nasal mucosa [11].
• Reduced sensitivity of the nasal mucosa [12].
• Enlargement of the nasal cavity resulting from
involution atrophy of the nasal mucosa [13, 14].
• Decrease in the body’s water content [15].
Altered airow due to changes in geometry leads to changes in the conditioning situation [14,
147
16], with the result that in over 60-year-olds, the
air-conditioning capacity becomes impaired: both intranasal air temperature and humidity decrease [17].
A familial, i.e. genetic, impairment of nasal air-conditioning has been reported by Sahin- Yilmaz et al. [18], who investigated 47 pairs of twins [11].
13.2.1 Clinical Entities
In common with the symptom itself, a number of individual diseases associated with the symptoms dry nose and crusting are not only unclearly dened but also overlap. In the literature, the fol­lowing descriptions are to be found:
• Rhinitis sicca anterior (Fig.13.2).
• Primary rhinitis atrophicans/primary atrophic
rhinitis (= PAR) – rhinitis atrophicans with
foetor (ozaena) (Fig.13.3).
• Secondary rhinitis atrophicans/secondary or
diffuse atrophic rhinitis (= SAR).
13.2.1.1 Rhinitis Sicca Anterior
The term rhinitis sicca anterior denes a chronic inammation in the region of the anterior part of the nose usually affecting the anterior and cau­dal septum and/or the corresponding lateral nasal vestibule. Due to irritation (mechanical, nger picking; toxic; persistent secretion; respi­ration; (air)ow characteristics; dry, hot and dusty environment), drying, supercial erosion and/or ulceration with (thin) crust formation occur.
Patients experience a sensation of dryness, itching and increased crust formation. The crusts are thin and dry and do not extend into the poste­rior part of the nasal cavity, as is the case with atrophic rhinitis. Usually, there is no foetid smell—only an occasional patient experiences mild foetor caused by bacterial colonisation of the small crusts. Manipulations may give rise to a vicious circle of increased crusting and persistent complaints. In the individual case, continued irri­tation and manipulation may result in perforation of the nasal septum.
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Fig. 13.2 Rhinitis sicca anterior with dry skin in the nasal vestibule and thin yellowish crusts
Fig. 13.3 Dry nose with persistent excessive crusting in a female patient with primary atrophic rhinitis
Treatment consists of the application of a pro­tective lm to the skin of the nasal vestibule, to allow the chronic inammation disrupting its integrity to self-heal while avoiding mechanical irritation (Fig.13.1). This is usually achieved by the application of ointments. Nasal sprays con­taining dexpanthenol have also been used with success [19].
13.2.1.2 Primary Atrophic Rhinitis
(PAR)
Primary atrophic rhinitis is a gradually progres­sive chronic degenerative condition of the nasal mucosa of unknown aetiology. Progressive atro­phy of all the constituents of the mucosa (epithe-
R. K. Weber et al.
lium, glands and vessels together with osteoclasis) mainly affects the turbinates. The respiratory epi­thelium undergoes stepwise metaplastic changes. Histologically, atrophy of the serous and mucous glands, loss of the cilia and goblet cells, chronic inltration of the lamina propria with granula­tions and scar formation are seen. Some publica­tions also report diminished vascular density together with peri- and endarteritis. The histo­logical changes explain the disturbance to muco­ciliary transport. Thick secretion that is not transported away promotes the formation of bac­terially contaminated crusts that may then be a source of recurrent bacterial Infection. If rhinitis atrophicans is complicated by foetid crust forma­tion, rhinitis atrophicans with foetor (stinking nose, ozaena) results. Microbiological investiga­tion usually detects Klebsiella ozaenae (100% of the 45 patients of Moore and Kern [20]) but also Staphylococcus aureus, Proteus mirabilis, E. coli and other bacteria (Bordetella bronchiseptica and Pasteurella multocida). Endoscopic examination reveals a markedly large and wide nasal cavity and visibly dry mucosa. The turbinates are clearly diminished in size. With ozaena, yellowish-green crusts are found on the mucosa. Apart from crust­ing, the patient usually also suffers from hypo- or anosmia. Foetor may give rise to social problems.
The cause of PAR is unknown, but both genetic and infectious causes are under discus­sion. The condition is more commonly seen in association with low socio-economic status, a poor diet and iron deciency. A much less fre­quent use of antibiotics in countries with a higher incidence of the condition may have a role to play. The fact that women are more frequently affected suggests a possible endocrinal factor. Over the past years and decades the prevalence of PAR has declined.
13.2.1.3 Secondary Atrophic Rhinitis
(SAR)
Secondary atrophic rhinitis develops in the soil of an underlying disease or may result from previ­ous therapeutic measures. Therefore, it is a col­lective term for several conditions with a different aetiology but a similar clinical feature with the subjective feeling of a dry nose, crusting, gege-
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benenfalls nasal obstruction, foul smelling and epistaxis as outlined above. In contrast to PAR, there is no osteoclastic activity, so the term dif­fuse atrophic rhinitis may be more suitable. Pathogenetic factors leading to SAR are as follows:
• Prior radical endonasal surgery. Persistent chronic rhinosinusitis in addition may increase the probability of the development of SAR [21].
• Prior radiotherapy of the head and neck.
• Sjögren’s syndrome.
• Extremely rarely: prior trauma.
In the largest collection of cases to date 197
patients with sRA, the following causes were identied [20]:
• Complete removal of the lower and middle nasal turbinates (24%).
• Partial removal of the lower and/or middle nasal turbinates (56%).
• Endonasal sinus surgery without turbinec­tomy (10%).
• Partial maxillectomy to remove a tumour (6%).
• Nasal trauma requiring surgical reconstruc­tion (1%).
• Granulomatous disease (1%).
pharynx at increased velocity [24]. According to Houser, the pain too is a typical symptom caused by the action of cold air on the mucosa covering the sphenopalatine ganglion [25].
Resection of the lower and middle turbinates reduces the effectiveness of the climatisation function of the nose by 23% [26, 27]. The para­doxical impairment of nasal respiration is explained by the unphysiological airow, the reduced nasal airway resistance, the lack of areas of functional mucosa together with the simulta­neous enlargement of the nasal cavity, and the curtailed contact between air and mucosa [24]. Enlargement of the nasal cross-section reduces the airway resistance and thus the pressure gradi­ent at the air/mucosa surface. In turn, this causes malfunction of the nasopulmonary reexes, which may lead to a worsening of pulmonary function. In contrast, optimal nasal airway resis­tance is important for the dilatation of the periph­eral bronchioles and for improved alveolar gas exchange.
The risk to develop SAR after resection of the turbinates depends on the extent of resection, individual factors of the patient itself and other external factors which are not clearly dened up to now. Some authors did not nd any sign of SAR after total resection of the inferior turbi­nates [2831]; others report SAR in 2–22% [27,
3236].
Empty nose syndrome (ENS) is dened as a form of iatrogenic SAR, occurring after radical endonasal surgery in particular resection of the nasal turbinates (lower and/or middle), usually in connection with an operation on the nasal sinuses [2224]. It is characterised by the symptoms nasal and pharyngeal dryness, paradoxical impairment of nasal respiration, dyspnoea and hyposmia, in some cases associated with depres­sion [25].
The disturbed sense of smell is the result of the changed airow. The dryness of the pharyngeal mucosae is due to the fact that, in contrast to the normal situation, drier intranasal air (no moisture since turbinate mucosa is lacking) results in dis­rupted airow in the region of the choanae and also impinges on the posterior wall of the naso-
13.3 Diagnosis
Extensive history taking is always followed by inspection of the outer and inner nose (Table13.2). This should, for example, identify any anatomi­cal deformations that might cause dry nose by changing the ow of air through the nose. For the purpose of detecting minor lesions in the nasal vestibule in patients with rhinitis sicca anterior, the use of a microscope may prove useful. Endonasal inspection should look for septal devi­ation or perforation and note the size and shape of the turbinates, the presence and nature of crusts, the humidity of the mucosa, polyps or tumours, postnasal secretion and the nasopharyn­geal status.
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Table 13.2 Diagnostic workup of dry nose
Medical history Inspection of the external and inner nose Endoscopy of the nasal cavity and nasopharynx, where indicated, also of (operated) paranasal sinuses Where indicated, CT of the paranasal sinuses Allergy testing Microbiological swab
A CT of the nasal sinuses is indicated when signs of chronic rhinosinusitis are found or to obtain adjunctive evidence of PAR.Typical signs of PAR in the CT include:
• Thickened mucosa in the paranasal sinuses.
• The osteomeatal complex can no longer be
dened due to the destruction of the normal
anatomy.
• Hypoplasia of the maxillary sinus.
• Enlargement of the nasal cavity with destruc-
tion of the lateral nasal wall.
• Bony destruction of the inferior and middle
turbinates.
Testing for allergy is important, for example, in order to diagnose a house mite allergy, which may be associated with the symptom dry nose. When endoscopic examination reveals purulent streaks or crusting, swabs should be taken for a microbiological examination.
The diagnosis is based on the case history, endoscopic ndings and, where necessary, adjunctive diagnostic measures.
13.4 Treatment
Treatment of dry nose comprises:
• Elimination or amelioration of triggering or
promoting factors.
• Moisturisation (Table13.3).
• Sufcient daily drinking amount.
• Cleansing (when crusts are present) and care
of the mucosa.
• Treatment of obvious infections.
• Where applicable, the elimination of an over-
large endonasal air space.
The individual may have only limited control over environmental factors. The importance of
Table 13.3 Substances for moistening the nose and mucosal care
Nasal douches with saline solution NaCl solution Special saline solution Isotonic–hypertonic, with and without buffering
(alkaline) Nasal ointments Dexpanthenol Salt-containing nasal ointments Diverse other formulations Nasal oils Sesame oil Vitamin A oil Salt water sprays Hyaluronic acid nasal spray Dexpanthenol nasal spray
the latter is obvious when dry nose is no longer experienced during a holiday but reappears when this is over.
By far the most common complaint is a sub­jective dry nose with no endoscopic ndings with the possible exception of a somewhat dry mucosa in the anterior nose. This is the case in almost all those patients exposed to unfavourable climatic or workplace conditions and also the large group of patients with obstructive sleep apnoea syn­drome undergoing CPAP treatment. Also affected are patients operated on the nose, before the cli­matisation function has normalised.
Apart from the strict avoidance of local manipulation, these patients require humidica­tion and care of the dry areas. For this purpose, the market offers a wide range of ointments, oils, sprays and nasal irrigation (Table13.4).
The nose should be humidied, viscous mucus ushed and liqueed; all inammation-inducing and inammation-promoting substances should be cleared out. A protective lm should be applied to prevent drying. Transepithelial water loss can be countered by the nasal application of saline solutions or other substances [37].
13.4.1 Nasal Irrigation, Nasal Saline
Spray andInhalation
Nasal irrigations are recommended for a large number of diseases of the nose and nasal sinuses [38]. Precisely, how nasal irrigation works is not
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Table 13.4 Basic rules for the treatment of dry nose
Elimination of promoting factors Environmental and workplace situation Dietary, iron and vitamin deciency (?) Moistening Local (nasal irrigation, inhalation, nasal spray) Environment (elevated air humidity) Systemic: Sufcient liquid intake Removal of crusts (nasal irrigation, instrumental removal by ENT clinician) Avoidance of injurious factors Local (nose picking, cotton carrier, decongestant
nose drops, ointments containing potentially injurious substances– Imidazoline derivates, cortisone applied to the skin of the nasal vestibule,
…) Systemic drugs (see Table13.1) Care of the mucosa Oils Ointments Occlusion Treatment of infections Allergic rhinitis Ozaena Chronic rhinosinusitis Correction of an overlarge air space Occlusion Augmentation
clear. It is postulated that the improvement in mucosal function is due to:
• Direct physical cleansing by ushing out thick mucus, crust, debris, allergens, environmental toxins, etc. [39, 40]
• Removal of inammation mediators.
• Improvement of mucociliary clearance by improving the ciliary beat frequency [41, 42].
In a recent review article published in 2009
[43], nasal irrigation is recommended:
• As adjunctive treatment for chronic rhinosi­nusitis (Grade A evidence: consistent study results of good quality).
• As adjunctive treatment for allergic rhinitis and viral ARS and follow-up treatment after nasal sinus surgery (Grade B evidence: incon­sistent results or limited quality).
• For rhinitis of pregnancy, acute bacterial RS, also sarcoidosis or Wegener’s disease (Grade C evidence: consensus recommendations, usual practice, expert opinion, results of case series).
The above shows that on the one hand, nasal
irrigation is a common recommendation, while on the other hand, the indication dry nose is not explicitly included in the recommendation, since informative studies that can be integrated into the evidence-based recommendations are very rare.
Nevertheless, nasal irrigations are an impor-
tant therapeutic option in patients with dry nose. In the case of recurrent crust formation, it is vir­tually indispensable as an adjunctive aid to instrumental clearing by the ENT physician.
The most commonly employed nasal sprays
are salt solutions. In addition to household salt— iodised or non-iodised—pharmaceutical grade salts as well as special nasal spray salts and brines are used [39, 40]. These solutions may be iso­tonic, hypotonic, hypertonic, unbuffered or buff­ered. Mildly hypertonic saline solutions (up to approximately 3%), with or without buffering, are all suitable for nasal irrigation. However, it is currently not clear which saline solution is best for what indication.
For isotonic saline solutions (isotonic unbuf-
fered, buffered Emser saline solution), numerous investigations have shown that daily application over the long-term produces positive results (pre­vention and treatment of upper airway infection/ rhinosinusitis, aftercare following surgery on nasal sinuses) with no relevant side effects.
In principle, saline sprays serve the same pur-
pose as nasal irrigation. Although no systematic comparison has been reported, the remark by Schmidt that diffuse moistening of the nasal mucosa can be achieved only with irrigation since the spray is merely a punctiform applica­tion, is accurate and the potential therapeutic effect must therefore be considered smaller. For the present, the extent to which the admixture of other substances results in a real benet in the treatment of dry nose remains uncertain.
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Inhalation with saline solutions with the aim of moistening the mucosa is also recommended and applied. In view of the resulting diffuse moistening of the mucosa, this can be considered positive in the case of a dry nose. Unfortunately, no meaningful studies are available.
13.4.2 Nasal Ointments
Despite the fact that many patients often use nasal ointments, no meaningful studies on their use in dry nose are available.
A moistening effect is achieved with intrana­sal use: the application of a nasal ointment reduces nasal water loss—as also does the appli­cation of glycerol 10% [37].
Elberg reported on the effect of Emser salt applied in the form of Nisita® Nasal Ointment in 1500 cases including pre- and post-operative applications in patients undergoing operations on the nose and nasal sinuses [44]. Neither pain nor infections were observed with regular applica­tion, despite the fact that no antibiotic was given. Follow-up care was reportedly considerably facilitated and abbreviated.
The quality level must, however, as in company- sponsored application studies—which are not considered here—be Grade V evidence.
In comparison with dexpanthenol nasal oint­ment, dexpanthenol nasal spray proved just as effective, or even tendentially superior, in terms of its effect on mucociliary transport (saccharine test) reported by Verse etal. in a prospective, ran­domised, open, crossover study [45]. Its advan­tage vis-à-vis the ointment is presumably the fact that it reaches the upper parts of the nasal cavity.
Topical dexpanthenol is said to reduce tran­sepidermal water loss, to activate in vivo and invitro broblast proliferation and to accelerate the re-epithelialisation process [46].
13.4.3 Nasal Oils
Oils in a not-too-high concentration bring about an improvement in the nasal ciliary beat fre­quency (CBF). In contrast to Miglyol 840 and thyme oil, sesame oil, soy oil, peanut oil, laven-
der oil, eucalyptus oil and menthol increased the CBF, the effect being higher at a concentration of the oils of 0.2% than at 2% [47]. According to Riechelmann etal. a mixture of menthol, euca­lyptus oil and pine needle oil in concentrations up to 5% had no major negative effect on CBF but did at concentrations of between 7.5 and 10g/m3 [48]. With conventional inhalation, concentra­tions of max. 1% are to be expected.
In a randomised crossover study involving 79 patients with dry nasal mucosa, [49] showed that in comparison with a sodium chloride solution, treatment with sesame oil resulted in a superior moistening effect [49]. Dryness and subjectively impaired nasal respiration were improved signi­cantly better by sesame oil in comparison with saline irrigation. Björk-Eriksson et al. also reported a signicant effect of sesame oil (3×3 puffs of 25 μl spray daily for 30 days) on the symptoms impaired nasal respiration, dryness (burning sensation, itching, irritation) and crust formation in 20 patients with dry nose and 15 patients post-radiation treatment [50]. A total of ve patients reported side effects (one each with unpleasant odour, itching and disturbed nasal res­piration and runny nose in two).
13.4.4 Others
Home remedies and self-treatments recom­mended on the Internet are mostly concerned with achieving moisturising, the application of oils and the prevention of drying, but the efcacy of the respective measures remains unclear. Homoeopathy always recommends an individual constitutional approach to treatment.
In the elderly patient with a dry nose, Slavin recommends moistening the nasal mucosa and looking out for medicament side effects (in par­ticular avoidance of rst-generation antihista­minics and decongestive nose drops) [15].
A rough topographical endoscopically orien­tated classication may be useful for the differen­tial treatment of the dry nose symptom:
• In the case of problems localised in the ante-
rior nose (rhinitis sicca anterior in the widest
sense) with a visible lesion and possibly crust-
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ing, the rst indication is the local application of ointment. Relevant comparative studies are not available. Potentially injurious substances (decongestant medications, cortisone, aller­gising substances) should be avoided.
• Vague complaints of dry nose in the absence of visible changes to the nasal mucosa would appear the most likely indication for moistur­ising measures (nasal irrigation, inhalation, moisturising sprays). The question as to whether admixed medicaments can diminish the water loss on expiration needs further investigation.
• Dry nose with visible intranasal crust forma­tion is the domain of nasal irrigation, which is better able to remove crusts than inhalation or sprays.
13.4.5 Treatment ofAtrophic Rhinitis
Basic treatment consists of the above outlined measures for dry nose. In the case of atrophic rhi­nitis moistening measures must be accompanied by removal of any crusts and scabs. For this pur­pose, not only the commonly employed instru­mental removal by the ENT specialist but also nasal irrigation is used. As suitable solutions, the literature mentions not only the classical irriga­tion solutions (buffered and unbuffered solutions of common salt or special salts) but also solutions of 25% glucose in glycerine and antibiotics [51]. Tap water and other hypotonic solutions are to be rejected.
Bacterial superinfections are treated with spe-
cic antibiotics. For ozaena, antibiotic treatment is reported to achieve long-lasting results, e.g. rifampicin 600mg daily for 12weeks [51] and ciprooxacin 2×500–750mg for 8weeks [52].
Operative measures aim to reduce the size of,
or temporarily occlude, the nasal cavity. Although occlusion can resolve the problem of crusting and the considerable social stigma of foetor, it also impairs nasal breathing and the sense of smell. For the diminishment of nasal cavity size using submucosal implantation of tissue, foreign mate­rial should not be used despite that some authors describe promising result [53, 54]. [53] implanted Plastipore, a high-density polyethylene sponge
with micropores, and reported excellent results in six patients and good results with only minor crusting in two patients and one extrusion after 18 months [53]. Rice used hydroxyapatite for augmentation in one case and reported good results [54]. According to Houser, more suitable materials are the patient’s own cartilage (e.g. rib cartilage) or acellular dermis (AlloDerm®) [25]. He treated eight patients with the implantation of AlloDerm®, which resulted in a signicant improvement in symptom scores (SNOT 20) after at least 3months. For treatment planning, the cotton test is suggested: moistened cotton is applied to the area to be augmented for 20–30min. If the test is positive, the patient can be offered the augmentation. Friedman etal. [55] and Moore and Kern [20] reported some success with acel­lular dermis, too, in 5 of 10 and 7 of patients, respectively.
13.5 Prophylaxis
Since the uncritical resection of the nasal turbi­nates represents a signicant and frequent factor in the genesis of dry nose, secondary RA and ENS, the following points must be strongly emphasised:
• The main objective of nasal turbinate surgery must be the preservation of functional mucosa while creating an adequately large volume capable of ensuring climatisation and the cleansing of the respired air and also preserv­ing physiological airway resistance [24].
• Without adequate justication the middle turbinate should not be resected. Reduction of the lower nasal turbinate should rst be given careful consideration, simultaneous removal of both the lower and middle turbi­nates should not be done for a non-tumorous condition [56].
13.6 Conclusions
Despite that there is no clear denition of dry nose, many patients complain of this symptom. A carefully taken patient’s history and thorough
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rhinologic examination by an experienced and vigilant clinician are the key elements to optimal outcomes. The turbinates should be handled very cautiously in sinonasal surgery.
Pearls
• There is no clear definition of what a dry nose is.
• Symptoms range from the purely subjective sensation of a rather dry nose to visible crust­ing of the (inner) nose (nasal mucosa).
• Relevant diseases are rhinitis sicca anterior, primary and secondary rhinitis atrophicans, rhinitis atrophicans with foetor (ozaena) and empty nose syndrome.
• Drugs and environmental factors can induce a dry nose.
• The diagnosis is based mainly on the patient’s history, inspection of the nose and endoscopy of the nasal cavity, sinuses and nasopharynx.
• Treatment consists in the elimination of pre­disposing factors, moistening, removal of crusts, avoidance of injurious factors, care of the mucosa, treatment of infections and, where applicable, correction of an overlarge air space.
• Normal turbinates should be preserved in sinonasal surgery.
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Physiology oftheAging Nose
https://t.me/medicina_free
andGeriatric Rhinitis
YazanEliyan, VictoriaE.Varga-Huettner, andJayantM.Pinto
14
Core Messages
• The world’s population is rapidly aging due to increasing life expectancy.
• Physiological changes of the nose with age include external structural changes, altera­tions of the thickness of the respiratory epi­thelium, decreased ciliary function, blunted vascular responses, decreased intranasal sensitivity and olfaction, reduced immune defense, and decreased ability to humidify the air.
• Such changes contribute to rhinitis in older patients as well as a range of nasal diseases.
• Geriatric rhinitis is poorly understood from a mechanistic standpoint but can be divided by cause into allergic and nonallergic categories.
• Allergic causes can receive standard therapies and symptoms tend to be milder in older patients.
• Nonallergic causes are more difcult to treat and require careful attention to the precise
Y. Eliyan Pritzker School of Medicine, Chicago, IL, USA e-mail: Yazan.Eliyan@uchospitals.edu
V. E. Varga-Huettner Ellis Medical Group, Ear, Nose and Throat Care, Schenectady, NY, USA
J. M. Pinto (*) Section of Otolaryngology-Head and Neck Surgery, Department of Surgery, The University of Chicago Medicine and Biological Sciences, Chicago, IL, USA e-mail: jpinto@surgery.bsd.uchicago.edu
triggers and symptoms; therapies are targeted to the symptom.
• Nonspecic treatments such as humidica­tion, mucolytics, and saline irrigations are generally safe and effective.
• Surgical and medical treatments for geriatric rhinitis are safe and effective, but special con­siderations of geriatric issues such as poly­pharmacy, alterations in hepatic and renal function, and side effect proles must be made.
14.1 Importance ofAging
inRhinology
The world is facing a massive demographic shift in the next 30years. Both developed and developing nations are experiencing growth in the oldest age groups and declines in children. Indeed, the pro­portion of older persons was 8% in 1950, 10% in 2000, and is projected to reach 21% in 2050 (http://
www.un.org/esa/population/publications/world­ageing19502050/). The global median age has
increased from 21.5years in 1970 to over 30years in 2019. As people have fewer children and those children are more likely to survive, and adults live longer due to advances in hygiene and medicine, the age structure continues to change toward increased numbers and proportions of older adults. For example, 8% are older than 65in 2019 (https://
ourworldindata.org/age- structure). These trends
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2023 Ö. Ö. Celebi, T. M. Önerci (eds.), Nasal Physiology and Pathophysiology of Nasal Disorders,
https://doi.org/10.1007/978-3-031-12386-3_14
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