Hayrettin Hakan Aykan

Dr. Hayrettin Hakan Aykan

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 September 2020 in Rheumatology International
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Journal Article
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UAUmmusen Kaya Akca
Ummusen Kaya Akca
SKSelman Kesici
Selman Kesici
YOYasemin Ozsurekci
Yasemin Ozsurekci
HAHayrettin Hakan Aykan
Hayrettin Hakan Aykan
EBEzgi Deniz Batu
Ezgi Deniz Batu
SOSeza Ozen
Seza Ozen

12 June 2020 in European Heart Journal
Verified
Journal Article
Closed access
SKSelman Kesici
Selman Kesici
HAHayrettin Hakan Aykan
Hayrettin Hakan Aykan
DODiclehan Orhan
Diclehan Orhan
BBBenan Bayrakci
Benan Bayrakci

1 January 2015 in Emerging Infectious Diseases
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Journal Article
Open access
HTHasan Tezer
Hasan Tezer
AOAslınur Ozkaya-Parlakay
Aslınur Ozkaya-Parlakay
HAHayrettin Hakan Aykan
Hayrettin Hakan Aykan
MEMustafa Erkocoglu
Mustafa Erkocoglu
BGBelgin Gülhan
Belgin Gülhan
SKSelcuk Kilic
Selcuk Kilic
Tularemia, a zoonotic disease caused by Francisella tularensis, is found throughout most of the Northern Hemisphere. It is not well known and is often misdiagnosed in children. Our aim with this study was to evaluate the diagnosis, treatment, and prognosis for 100 children with tularemia in Turkey. The mean patient age was 10.1 ± 3.5 years (range 3–18 years), and most (63%) patients were male. The most common physical signs and laboratory findings were cervical lymphadenopathy (92%) and elevated erythrocyte sedimentation rate (89%). Treatment response was higher and rate of relapse lower for children 5–10 years of age than for those in other age groups. Associated with treatment failure were female sex, treatment delay of ≥16 days, and use of doxycycline. Tularemia is endemic to Turkey, and the number of cases has been increasing among children as well as adults.

19 May 2021 in Clinical and Experimental Rheumatology
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Journal Article
Open access
EBErtugrul Cagri Bolek
Ertugrul Cagri Bolek
UAUmmusen Kaya Akca
Ummusen Kaya Akca
ASAlper Sari
Alper Sari
ESErdal Sag
Erdal Sag
SDSelcan Demir
Selcan Demir
SOSeza Ozen
Seza Ozen
Clinical aspects; Authors: E.C. Bolek, U. Kaya Akca, A. Sari, E. Sag, S. Demir, L. Kilic, Y.Z. Sener, H.H. Aykan, E.B. Kaya, Y. Bilginer, A. Akdogan, S. Kiraz, O. Karadag, S. Ozen

16 December 2011 in European Journal of Pediatrics
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Ener Cagri DinleyiciEner Cagri Dinleyici
Ener Cagri Dinleyici
VGVARICOMP Study Group
VARICOMP Study Group
ZKZafer Kurugol
Zafer Kurugol
OTOzden Turel
Ozden Turel
NHNevin Hatipoglu
Nevin Hatipoglu
SASaadet Akarsu
Saadet Akarsu
Varicella can cause complications that are potentially serious and require hospitalization. Our current understanding of the causes and incidence of varicella-related hospitalization in Turkey is limited and sufficiently accurate epidemiological and economical information is lacking. The aim of this study was to estimate the annual incidence of varicella-related hospitalizations, describe the complications, and estimate the annual mortality and cost of varicella in children. VARICOMP is a multi-center study that was performed to provide epidemiological and economic data on hospitalization for varicella in children between 0 and 15 years of age from October 2008 to September 2010 in Turkey. According to medical records from 27 health care centers in 14 cities (representing 49.3% of the childhood population in Turkey), 824 children (73% previously healthy) were hospitalized for varicella over the 2-year period. Most cases occurred in the spring and early summer months. Most cases were in children under 5 years of age, and 29.5% were in children under 1 year of age. The estimated incidence of varicella-related hospitalization was 5.29–6.89 per 100,000 in all children between 0–15 years of age in Turkey, 21.7 to 28 per 100,000 children under 1 year of age, 9.8–13.8 per 100,000 children under 5 years of age, 3.96–6.52 per 100,000 children between 5 and 10 years of age and 0.42 to 0.71 per 100,000 children between 10 and 15 years of age. Among the 824 children, 212 (25.7%) were hospitalized because of primary varicella infection. The most common complications in children were secondary bacterial infection (23%), neurological (19.1%), and respiratory (17.5%) complications. Secondary bacterial infections (p < 0.001) and neurological complications (p < 0.001) were significantly more common in previously healthy children, whereas hematological complications (p < 0.001) were more commonly observed in children with underlying conditions. The median length of the hospital stay was 6 days, and it was longer in children with underlying conditions (<0.001). The median cost of hospitalization per patient was $338 and was significantly higher in children with underlying conditions (p < 0.001). The estimated direct annual cost (not including the loss of parental work time and school absence) of varicella-related hospitalization in children under the age of 15 years in Turkey was $856,190 to $1,407,006. According to our estimates, 882 to 1,450 children are hospitalized for varicella each year, reflecting a population-wide occurrence of 466–768 varicella cases per 100,000 children. In conclusion, this study confirms that varicella-related hospitalizations are not uncommon in children, and two thirds of these children are otherwise healthy. The annual cost of hospitalization for varicella reflects only a small part of the overall cost of this disease, as only a very few cases require hospital admission. The incidence of this disease was higher in children <1 year of age, and there are no prevention strategies for these children other than population-wide vaccination. Universal vaccination is therefore the only realistic option for the prevention of severe complications and deaths. The surveillance of varicella-associated complications is essential for monitoring of the impact of varicella immunization.

28 August 2019 in Cardiology in the Young
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Journal Article
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AKAsuman Nur Karhan
Asuman Nur Karhan
HAHayrettin Hakan Aykan
Hayrettin Hakan Aykan
EGErsin Gumus
Ersin Gumus
YDYasemin Dönmez
Yasemin Dönmez
DADursun Alehan
Dursun Alehan
AYAysel Yüce
Aysel Yüce
Background: This study evaluated cardiac function using tissue Doppler echocardiography and assessed electrocardiographic findings in children diagnosed with Wilson’s disease.Method: Asymptomatic patients with a diagnosis of Wilson’s disease (n = 43) were compared to healthy controls (n = 37) that were age and gender matched.Results: The standard electrocardiographic and conventional echocardiographic examinations were similar in both groups. The left ventricular ejection fraction, shortening fraction, and diastolic function were not significantly different between the two groups. The Tei index for mitral lateral, mitral septal, tricuspid lateral, tricuspid septal, and inter-ventricular septum on tissue Doppler echocardiography was higher in the patient group, yet it did not reach statistical significance. Mitral lateral and septal systolic annular velocity values were significantly lower in the patient group when compared to the control group (p = 0.02 and 0.04, respectively). Also, mitral lateral and septal isovolumetric contraction time values were higher in the patient group (p = 0.04). Although the left ventricular values were not significantly different, relative left ventricular wall thickness was higher in the patient group when compared to the control group, and concentric remodelling in the left ventricle was found in 7 (16%) of 42 patients. QT interval (p = 0.02) and P-wave dispersion values (p = 0.04) were significantly higher in the patient group compared to the control group, and these tend to predict arrhythmias.Conclusion: Our study based on the tissue Doppler echocardiography assessment indicated a subclinical systolic, rather than diastolic, dysfunction in the myocardium with increased QT interval and P-wave dispersion, despite the young age of the patients and short disease duration.