Research Article
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Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome

Year 2020, , 29 - 35, 30.04.2020
https://doi.org/10.18678/dtfd.674962

Abstract

Aim: The aim of this study is to evaluate patients with Obstructive Sleep Apnea Syndrome (OSAS) in terms of various cognitive functions and determine the relationship between cognitive functions with anxiety and depression levels.
Material and Methods: This cross-sectional study was conducted between June 15, 2019 and December 15, 2019 and included 34 OSAS patients and 28 healthy volunteers between the ages of 18-65 with at least primary education. All participants underwent overnight recording of polysomnography. Patients were evaluated using sociodemographic data form, Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), Montreal Cognitive Assessment (MoCA) and the Stroop Color and Word Test (SCWT).
Results: There was no significant difference between the OSAS and control group in terms of age and gender. OSAS patients had significantly higher depression and anxiety scores compared to the control group. OSAS patients showed poor performance in naming, attention, abstract thinking, and delayed recalling compared to the control group. OSAS patients completed Stroop tests 1, 3, and 5 in a longer amount of time than the control group. Cognitive functions were found to have a significant negative correlation with apnea hypopnea index, BDI, and BAI scores.
Conclusion: OSAS was found to have a different effect on each subcomponents of cognitive function. Furthermore, it was determined that many negative factors caused by OSAS may play a role in cognitive involvement in OSAS. Further studies are warranted to shed light on the ethiopathogenesis of this subject.

Thanks

We express our sincere appreciation to the patients with obstructive sleep apnea syndrome and the healthy volunteers who participated in this study.

References

  • Daurat A, Sarhane M, Tiberge M. Obstructive sleep apnea syndrome and cognition: A review. Neurophysiol Clin. 2016;46(3):201-15.
  • Gagnon K, Baril AA, Gagnon JF, Fortin M, Décary A, Lafond C, et al. Cognitive impairment in obstructive sleep apnea. Pathol Biol (Paris). 2014;62(5):233-40.
  • Kısabay Ak A, Sarı ÜS, Oktan B, Korkmaz T, Dinç Horasan G, Selcuki D, et al. Evaluation of cognitive function using objective and subjective tests in the obstructive sleep apnea syndrome. J Turk Sleep Med. 2017;4(3):76-83.
  • Hamamci M, Alpua M, Ergün U, Inan LE. Obstructive sleep apnea syndrome and neurology. Bozok Med J. 2018;8(Special Issue):20-5.
  • Heinzer R, Vat S, Marques-Vidal P, Marti-Soler H, Andries D, Tobback N, et al. Prevalence of sleep-disordered breathing in the general population: the HypnoLaus study. Lancet Respir Med. 2015;3(4):310-8.
  • Peppard PE, Young T, Barnet JH, Palta M, Hagen EW, Hla KM. Increased prevalence of sleep-disordered breathing in adults. Am J Epidemiol. 2013;177(9):1006-14.
  • Verstraeten E. Neurocognitive effects of obstructive sleep apnea syndrome. Curr Neurol Neurosci Rep. 2007;7(2):161-6.
  • Goel N, Rao H, Durmer JS, Dinges DF. Neurocognitive consequences of sleep deprivation. Semin Neurol. 2009;29(4):320-39.
  • Olaithe M, Bucks RS, Hillman DR, Eastwood PR. Cognitive deficits in obstructive sleep apnea: insights from a meta-review and comparison with deficits observed in COPD, insomnia, and sleep deprivation. Sleep Med Rev. 2018;38:39-49.
  • Bucks RS, Olaithe M, Eastwood P. Neurocognitive function in obstructive sleep apnoea: A meta‐review. Respirology. 2013;18(1):61-70.
  • Demir Akça AS, Saraçli Ö, Emre U, Atasoy N, Güdül S, Özen Barut B, et al. Relationship of cognitive functions with daily living activities, depression, anxiety and clinical variables in hospitalized elderly patients. Noro Psikiyatr Ars. 2014;51(3):267-74.
  • Pantzar A, Laukka EJ, Atti AR, Fastbom J, Fratiglioni L, Bäckman L. Cognitive deficits in unipolar old-age depression: a population-based study. Psychol Med. 2014;44(5):937-47.
  • Bierman EJ, Comijs HC, Rijmen F, Jonker C, Beekman AT. Anxiety symptoms and cognitive performance in later life: results from the longitudinal aging study Amsterdam. Aging Ment Health. 2008;12(4):517-23.
  • Karaaslan Ö. Obstructive sleep apnea syndrome and psychiatry. Bozok Med J. 2018;8(Special Issue):34-8.
  • Doherty LS, Kiely JL, Lawless G, McNicholas WT. Impact of nasal continuous positive airway pressure therapy on the quality of life of bed partners of patients with obstructive sleep apnea syndrome. Chest. 2003;124(6):2209-14.
  • Kerner NA, Roose SP. Obstructive sleep apnea is linked to depression and cognitive impairment: evidence and potential mechanisms. Am J Geriatr Psychiatry. 2016;24(6):496-508.
  • Fidan F, Ünlü M, Sezer M, Pala E, Geçici Ö. Relationship between obstructive sleep apnea syndrome and anxiety or depression. Turk Thorac J. 2006;7(2):125-9.
  • Berry RB, Albertario CL, Harding SM, Loyd RM, Plate DT, Quan SF, et al. for the American Academy of Sleep Medicine. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications. Version 2.5. Darien, IL: American Academy of Sleep Medicine; 2018.
  • Beck AT, Ward CH, Mendelson M, Mock J, Erbaugh J. An inventory for measuring depression. Arch Gen Psychiatry.1961;4(6):561-71.
  • Hisli N. A study on the validity of Beck Depression Inventory. Turk Psychol J. 1988;6(22):118-26.
  • Beck AT, Epstein N, Brown G, Steer RA. An inventory for measuring clinical anxiety: psychometric properties. J Consult Clin Psychol. 1988;56(6):893-7.
  • Ulusoy M, Hisli Sahin N, Erkmen H. Turkish version of the Beck Anxiety Inventory: psychometric properties. J Cogn Psychother. 1998;12(2):163-72.
  • Selekler K, Cangöz B, Uluç S. Power of discrimination of Montreal Cognitive Assessment (MOCA) Scale in Turkish patients with mild cognitive impairement and Alzheimer's disease. Turk J Geriatr. 2010;13(3):166-71.
  • Stroop JR. Studies of interference in serial verbal reactions. J Exp Psychol. 1992;121(1):15-23.
  • Karakaş S, Erdoğan E, Soysal Ş, Ulusoy T, Yüceyurt Ulusoy İ, Alkan S. Stroop test TBAG form: standardisation for Turkish culture, reliability and validity. J Clin Psychiatry. 1999;2(2):75-88.
  • Aloia MS, Arnedt JT, Davis JD, Riggs RL, Byrd D. Neuropsychological sequelae of obstructive sleep apnea-hypopnea syndrome: a critical review. J Int Neuropsychol Soc. 2004;10(5):772-85.
  • Zimmerman ME, Aloia MS. A review of neuroimaging in obstructive sleep apnea. J Clin Sleep Med. 2006;2(4):461-71.
  • Beebe DW, Gozal D. Obstructive sleep apnea and the prefrontal cortex: towards a comprehensive model linking nocturnal upper airway obstruction to daytime cognitive and behavioral deficits. J Sleep Res. 2002;11(1):1-16.
  • Castronovo V, Scifo P, Castellano A, Aloia MS, Iadanza A, Marelli S, et al. White matter integrity in obstructive sleep apnea before and after treatment. Sleep. 2014;37(9):1465-75.
  • Joo EY, Tae WS, Lee MJ, Kang JW, Park HS, Lee JY, et al. Reduced brain gray matter concentration in patients with obstructive sleep apnea syndrome. Sleep. 2010;33(2):235-41.
  • Olaithe M, Bucks RS. Executive dysfunction in OSA before and after treatment: a meta-analysis. Sleep. 2013;36(9):1297-305.
  • Devita M, Zangrossi A, Marvisi M, Merlo P, Rusconi ML, Mondini S. Global cognitive profile and different components of reaction times in obstructive sleep apnea syndrome: Effects of continuous positive airway pressure over time. Int J Psychophysiol. 2018;123:121-6.
  • Rezaeitalab F, Moharrari F, Saberi S, Asadpour H, Rezaeetalab F. The correlation of anxiety and depression with obstructive sleep apnea syndrome. J Res Med Sci. 2014;19(3):205-10.
  • Sharafkhaneh A, Giray N, Richardson P, Young T, Hirshkowitz M. Association of psychiatric disorders and sleep apnea in a large cohort. Sleep. 2005;28(11):1405-11.
  • Gupta MA, Simpson FC. Obstructive sleep apnea and psychiatric disorders: a systematic review. J Clin Sleep Med. 2015;11(2):165-75.
  • Flemons WW, Tsai W. Quality of life consequences of sleep-disordered breathing. J Allergy Clin Immunol. 1997;99(2):S750-6.
  • Inanç L, Ünal Y, Kutlu G, Semiz ÜB. The relationship between illness severity, anxiety and depressive symptoms in obstructive sleep apnea syndrome patients. J Turk Sleep Med. 2017;4(3):71-5.
  • Özkurt S, Öztürk E, Yildiz Aİ, Dursunoğlu N, Özdel O, Akdağ B, et al. Psychiatric evaluation in patients with obstructive sleep apnea syndrome. Tuberk Toraks. 2013;61(3):216-20.
  • Dotson VM, Resnick SM, Zonderman AB. Differential association of concurrent, baseline, and average depressive symptoms with cognitive decline in older adults. Am J Geriatr Psychiatry. 2008;16(4):318-30.
  • Park J, Moghaddam B. Impact of anxiety on prefrontal cortex encoding of cognitive flexibility. Neuroscience. 2017;345:193-202.
  • Eysenck MW, Derakshan N, Santos R, Calvo MG. Anxiety and cognitive performance: attentional control theory. Emotion. 2007;7(2):336-53.
  • Naismith S, Winter V, Gotsopoulos H, Hickie I, Cistulli P. Neurobehavioral functioning in obstructive sleep apnea: differential effects of sleep quality, hypoxemia and subjective sleepiness. J Clin Exp Neuropsychol. 2004;26(1):43-54.
  • Ohayon MM, Vecchierini MF. Daytime sleepiness and cognitive impairment in the elderly population. Arch Intern Med. 2002;162(2):201-8.
  • Kylstra WA, Aaronson JA, Hofman WF, Schmand BA. Neuropsychological functioning after CPAP treatment in obstructive sleep apnea: a meta-analysis. Sleep Med Rev. 2013;17(5):341-7.
  • Ferini-Strambi L, Baietto C, Di Gioia M, Castaldi P, Castronovo C, Zucconi M, et al. Cognitive dysfunction in patients with obstructive sleep apnea (OSA): partial reversibility after continuous positive airway pressure (CPAP). Brain Res Bull. 2003;61(1):87-92.

Obstrüktif Uyku Apne Sendromunda Bilişsel Fonksiyonların Değerlendirilmesi

Year 2020, , 29 - 35, 30.04.2020
https://doi.org/10.18678/dtfd.674962

Abstract

Amaç: Bu çalışmanın amacı Obstrüktif Uyku Apne Sendromu (OUAS) hastalarını birçok bilişsel fonksiyon açısından değerlendirmek ve OUAS hastalarının bilişsel fonksiyonları ile anksiyete ve depresyon düzeyleri arasındaki ilişkiyi ortaya koymaktır.
Gereç ve Yöntemler: Bu kesitsel çalışmaya 15 Haziran 2019 ve 15 Aralık 2019 tarihleri arasında yapıldı ve 18-65 yaş arası en az ilkokul mezunu 34 OUAS hastası ve 28 sağlıklı gönüllü dahil edildi. Tüm katılımcıların bir gece boyunca polisomnografi kayıtları alındı. Tüm katılımcılara sosyodemografik veri formu, Beck Depresyon Ölçeği (BDÖ), Beck Anksiyete Ölçeği (BAÖ), Montreal Bilişsel Değerlendirme (MoCA) ve Stroop Renk ve Sözcük Testi (SCWT) uygulandı.
Bulgular: OUAS ile kontrol grubu arasında yaş, cinsiyet açısından anlamlı fark yoktu. OUAS hastalarının depresyon ve anksiyete ölçek puanları kontrol grubuna göre anlamlı şekilde daha yüksekti. OUAS hastalarının adlandırma, dikkat, soyut düşünme ve gecikmeli hatırlama performansları kontrol grubuna göre daha düşük idi. OUAS hastaları Stroop 1, 3 ve 5 testini kontrol grubundan daha uzun bir sürede tamamladı. Bilişsel fonksiyonların apne hipopne indeksi, BDÖ ve BAÖ skorları ile negatif yönde anlamlı bir korelasyonu olduğu bulundu.
Sonuç: OUAS’ın bilişsel fonskiyonların her bir alt birleşeni üzerinde farklı bir etkisinin olduğu saptandı. Ayrıca OUAS’daki bilişsel etkilenmenin altında, OUAS’ın neden olduğu birçok olumsuz faktörün rolü olabileceği tespit edildi. Bu konunun etyopatogenizin daha açık hale gelmesi için ileri çalışmalara ihtiyaç vardır.

References

  • Daurat A, Sarhane M, Tiberge M. Obstructive sleep apnea syndrome and cognition: A review. Neurophysiol Clin. 2016;46(3):201-15.
  • Gagnon K, Baril AA, Gagnon JF, Fortin M, Décary A, Lafond C, et al. Cognitive impairment in obstructive sleep apnea. Pathol Biol (Paris). 2014;62(5):233-40.
  • Kısabay Ak A, Sarı ÜS, Oktan B, Korkmaz T, Dinç Horasan G, Selcuki D, et al. Evaluation of cognitive function using objective and subjective tests in the obstructive sleep apnea syndrome. J Turk Sleep Med. 2017;4(3):76-83.
  • Hamamci M, Alpua M, Ergün U, Inan LE. Obstructive sleep apnea syndrome and neurology. Bozok Med J. 2018;8(Special Issue):20-5.
  • Heinzer R, Vat S, Marques-Vidal P, Marti-Soler H, Andries D, Tobback N, et al. Prevalence of sleep-disordered breathing in the general population: the HypnoLaus study. Lancet Respir Med. 2015;3(4):310-8.
  • Peppard PE, Young T, Barnet JH, Palta M, Hagen EW, Hla KM. Increased prevalence of sleep-disordered breathing in adults. Am J Epidemiol. 2013;177(9):1006-14.
  • Verstraeten E. Neurocognitive effects of obstructive sleep apnea syndrome. Curr Neurol Neurosci Rep. 2007;7(2):161-6.
  • Goel N, Rao H, Durmer JS, Dinges DF. Neurocognitive consequences of sleep deprivation. Semin Neurol. 2009;29(4):320-39.
  • Olaithe M, Bucks RS, Hillman DR, Eastwood PR. Cognitive deficits in obstructive sleep apnea: insights from a meta-review and comparison with deficits observed in COPD, insomnia, and sleep deprivation. Sleep Med Rev. 2018;38:39-49.
  • Bucks RS, Olaithe M, Eastwood P. Neurocognitive function in obstructive sleep apnoea: A meta‐review. Respirology. 2013;18(1):61-70.
  • Demir Akça AS, Saraçli Ö, Emre U, Atasoy N, Güdül S, Özen Barut B, et al. Relationship of cognitive functions with daily living activities, depression, anxiety and clinical variables in hospitalized elderly patients. Noro Psikiyatr Ars. 2014;51(3):267-74.
  • Pantzar A, Laukka EJ, Atti AR, Fastbom J, Fratiglioni L, Bäckman L. Cognitive deficits in unipolar old-age depression: a population-based study. Psychol Med. 2014;44(5):937-47.
  • Bierman EJ, Comijs HC, Rijmen F, Jonker C, Beekman AT. Anxiety symptoms and cognitive performance in later life: results from the longitudinal aging study Amsterdam. Aging Ment Health. 2008;12(4):517-23.
  • Karaaslan Ö. Obstructive sleep apnea syndrome and psychiatry. Bozok Med J. 2018;8(Special Issue):34-8.
  • Doherty LS, Kiely JL, Lawless G, McNicholas WT. Impact of nasal continuous positive airway pressure therapy on the quality of life of bed partners of patients with obstructive sleep apnea syndrome. Chest. 2003;124(6):2209-14.
  • Kerner NA, Roose SP. Obstructive sleep apnea is linked to depression and cognitive impairment: evidence and potential mechanisms. Am J Geriatr Psychiatry. 2016;24(6):496-508.
  • Fidan F, Ünlü M, Sezer M, Pala E, Geçici Ö. Relationship between obstructive sleep apnea syndrome and anxiety or depression. Turk Thorac J. 2006;7(2):125-9.
  • Berry RB, Albertario CL, Harding SM, Loyd RM, Plate DT, Quan SF, et al. for the American Academy of Sleep Medicine. The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications. Version 2.5. Darien, IL: American Academy of Sleep Medicine; 2018.
  • Beck AT, Ward CH, Mendelson M, Mock J, Erbaugh J. An inventory for measuring depression. Arch Gen Psychiatry.1961;4(6):561-71.
  • Hisli N. A study on the validity of Beck Depression Inventory. Turk Psychol J. 1988;6(22):118-26.
  • Beck AT, Epstein N, Brown G, Steer RA. An inventory for measuring clinical anxiety: psychometric properties. J Consult Clin Psychol. 1988;56(6):893-7.
  • Ulusoy M, Hisli Sahin N, Erkmen H. Turkish version of the Beck Anxiety Inventory: psychometric properties. J Cogn Psychother. 1998;12(2):163-72.
  • Selekler K, Cangöz B, Uluç S. Power of discrimination of Montreal Cognitive Assessment (MOCA) Scale in Turkish patients with mild cognitive impairement and Alzheimer's disease. Turk J Geriatr. 2010;13(3):166-71.
  • Stroop JR. Studies of interference in serial verbal reactions. J Exp Psychol. 1992;121(1):15-23.
  • Karakaş S, Erdoğan E, Soysal Ş, Ulusoy T, Yüceyurt Ulusoy İ, Alkan S. Stroop test TBAG form: standardisation for Turkish culture, reliability and validity. J Clin Psychiatry. 1999;2(2):75-88.
  • Aloia MS, Arnedt JT, Davis JD, Riggs RL, Byrd D. Neuropsychological sequelae of obstructive sleep apnea-hypopnea syndrome: a critical review. J Int Neuropsychol Soc. 2004;10(5):772-85.
  • Zimmerman ME, Aloia MS. A review of neuroimaging in obstructive sleep apnea. J Clin Sleep Med. 2006;2(4):461-71.
  • Beebe DW, Gozal D. Obstructive sleep apnea and the prefrontal cortex: towards a comprehensive model linking nocturnal upper airway obstruction to daytime cognitive and behavioral deficits. J Sleep Res. 2002;11(1):1-16.
  • Castronovo V, Scifo P, Castellano A, Aloia MS, Iadanza A, Marelli S, et al. White matter integrity in obstructive sleep apnea before and after treatment. Sleep. 2014;37(9):1465-75.
  • Joo EY, Tae WS, Lee MJ, Kang JW, Park HS, Lee JY, et al. Reduced brain gray matter concentration in patients with obstructive sleep apnea syndrome. Sleep. 2010;33(2):235-41.
  • Olaithe M, Bucks RS. Executive dysfunction in OSA before and after treatment: a meta-analysis. Sleep. 2013;36(9):1297-305.
  • Devita M, Zangrossi A, Marvisi M, Merlo P, Rusconi ML, Mondini S. Global cognitive profile and different components of reaction times in obstructive sleep apnea syndrome: Effects of continuous positive airway pressure over time. Int J Psychophysiol. 2018;123:121-6.
  • Rezaeitalab F, Moharrari F, Saberi S, Asadpour H, Rezaeetalab F. The correlation of anxiety and depression with obstructive sleep apnea syndrome. J Res Med Sci. 2014;19(3):205-10.
  • Sharafkhaneh A, Giray N, Richardson P, Young T, Hirshkowitz M. Association of psychiatric disorders and sleep apnea in a large cohort. Sleep. 2005;28(11):1405-11.
  • Gupta MA, Simpson FC. Obstructive sleep apnea and psychiatric disorders: a systematic review. J Clin Sleep Med. 2015;11(2):165-75.
  • Flemons WW, Tsai W. Quality of life consequences of sleep-disordered breathing. J Allergy Clin Immunol. 1997;99(2):S750-6.
  • Inanç L, Ünal Y, Kutlu G, Semiz ÜB. The relationship between illness severity, anxiety and depressive symptoms in obstructive sleep apnea syndrome patients. J Turk Sleep Med. 2017;4(3):71-5.
  • Özkurt S, Öztürk E, Yildiz Aİ, Dursunoğlu N, Özdel O, Akdağ B, et al. Psychiatric evaluation in patients with obstructive sleep apnea syndrome. Tuberk Toraks. 2013;61(3):216-20.
  • Dotson VM, Resnick SM, Zonderman AB. Differential association of concurrent, baseline, and average depressive symptoms with cognitive decline in older adults. Am J Geriatr Psychiatry. 2008;16(4):318-30.
  • Park J, Moghaddam B. Impact of anxiety on prefrontal cortex encoding of cognitive flexibility. Neuroscience. 2017;345:193-202.
  • Eysenck MW, Derakshan N, Santos R, Calvo MG. Anxiety and cognitive performance: attentional control theory. Emotion. 2007;7(2):336-53.
  • Naismith S, Winter V, Gotsopoulos H, Hickie I, Cistulli P. Neurobehavioral functioning in obstructive sleep apnea: differential effects of sleep quality, hypoxemia and subjective sleepiness. J Clin Exp Neuropsychol. 2004;26(1):43-54.
  • Ohayon MM, Vecchierini MF. Daytime sleepiness and cognitive impairment in the elderly population. Arch Intern Med. 2002;162(2):201-8.
  • Kylstra WA, Aaronson JA, Hofman WF, Schmand BA. Neuropsychological functioning after CPAP treatment in obstructive sleep apnea: a meta-analysis. Sleep Med Rev. 2013;17(5):341-7.
  • Ferini-Strambi L, Baietto C, Di Gioia M, Castaldi P, Castronovo C, Zucconi M, et al. Cognitive dysfunction in patients with obstructive sleep apnea (OSA): partial reversibility after continuous positive airway pressure (CPAP). Brain Res Bull. 2003;61(1):87-92.
There are 45 citations in total.

Details

Primary Language English
Subjects Clinical Sciences
Journal Section Research Article
Authors

Mehmet Hamamcı 0000-0001-7100-3952

Yavuz Selim İntepe 0000-0002-5697-5291

Bülent Çiftçi 0000-0003-2703-3817

Publication Date April 30, 2020
Submission Date January 14, 2020
Published in Issue Year 2020

Cite

APA Hamamcı, M., İntepe, Y. S., & Çiftçi, B. (2020). Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome. Duzce Medical Journal, 22(1), 29-35. https://doi.org/10.18678/dtfd.674962
AMA Hamamcı M, İntepe YS, Çiftçi B. Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome. Duzce Med J. April 2020;22(1):29-35. doi:10.18678/dtfd.674962
Chicago Hamamcı, Mehmet, Yavuz Selim İntepe, and Bülent Çiftçi. “Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome”. Duzce Medical Journal 22, no. 1 (April 2020): 29-35. https://doi.org/10.18678/dtfd.674962.
EndNote Hamamcı M, İntepe YS, Çiftçi B (April 1, 2020) Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome. Duzce Medical Journal 22 1 29–35.
IEEE M. Hamamcı, Y. S. İntepe, and B. Çiftçi, “Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome”, Duzce Med J, vol. 22, no. 1, pp. 29–35, 2020, doi: 10.18678/dtfd.674962.
ISNAD Hamamcı, Mehmet et al. “Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome”. Duzce Medical Journal 22/1 (April 2020), 29-35. https://doi.org/10.18678/dtfd.674962.
JAMA Hamamcı M, İntepe YS, Çiftçi B. Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome. Duzce Med J. 2020;22:29–35.
MLA Hamamcı, Mehmet et al. “Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome”. Duzce Medical Journal, vol. 22, no. 1, 2020, pp. 29-35, doi:10.18678/dtfd.674962.
Vancouver Hamamcı M, İntepe YS, Çiftçi B. Evaluation of Cognitive Functions in Obstructive Sleep Apnea Syndrome. Duzce Med J. 2020;22(1):29-35.