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Kubrova E, Hallo-Carrasco AJ, Klasova J, Pagan Rosado RD, Prusinski CC, Trofymenko O, Schappell JB, Prokop LJ, Yuh CI, Gupta S, Hunt CL. Persistent chest pain following COVID-19 infection - A scoping review. PM R 2024; 16:605-625. [PMID: 37906499 DOI: 10.1002/pmrj.13098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 10/07/2023] [Accepted: 10/24/2023] [Indexed: 11/02/2023]
Abstract
Persistent chest pain (PCP) following acute COVID-19 infection is a commonly reported symptom with an unclear etiology, making its management challenging. This scoping review aims to address the knowledge gap surrounding the characteristics of PCP following COVID-19, its causes, and potential treatments. This is a scoping review of 64 studies, including observational (prospective, retrospective, cross-sectional, case series, and case-control) and one quasi-experimental study, from databases including Embase, PubMed/MEDLINE, Cochrane CENTRAL, Google Scholar, Cochrane Database of Systematic Reviews, and Scopus. Studies on patients with PCP following mild, moderate, and severe COVID-19 infection were included. Studies with patients of any age, with chest pain that persisted following acute COVID-19 disease, irrespective of etiology or duration were included. A total of 35 studies reported PCP symptoms following COVID-19 (0.24%-76.6%) at an average follow-up of 3 months or longer, 12 studies at 1-3 months and 17 studies at less than 1-month follow-up or not specified. PCP was common following mild-severe COVID-19 infection, and etiology was mostly not reported. Fourteen studies proposed potential etiologies including endothelial dysfunction, cardiac ischemia, vasospasm, myocarditis, cardiac arrhythmia, pneumonia, pulmonary embolism, postural tachycardia syndrome, or noted cardiac MRI (cMRI) changes. Evaluation methods included common cardiopulmonary tests, as well as less common tests such as flow-mediated dilatation, cMRI, single-photon emission computed tomography myocardial perfusion imaging, and cardiopulmonary exercise testing. Only one study reported a specific treatment (sulodexide). PCP is a prevalent symptom following COVID-19 infection, with various proposed etiologies. Further research is needed to establish a better understanding of the causes and to develop targeted treatments for PCP following COVID-19.
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Affiliation(s)
- Eva Kubrova
- Department of Physical Medicine and Rehabilitation, Mayo Clinic Rochester, Rochester, Minnesota, USA
| | | | - Johana Klasova
- Department of Pain Medicine, Mayo Clinic, Jacksonville, Florida, USA
| | - Robert D Pagan Rosado
- Department of Physical Medicine and Rehabilitation, Mayo Clinic Rochester, Rochester, Minnesota, USA
- Department of Pain Medicine, Mayo Clinic, Jacksonville, Florida, USA
| | | | | | | | - Larry J Prokop
- Library and Public Services, Mayo Clinic, Rochester, Minnesota, USA
| | - Clara I Yuh
- Department of Physical Medicine and Rehabilitation, University of California, Irvine, California, USA
| | - Sahil Gupta
- Department of Pain Medicine, Mayo Clinic, Jacksonville, Florida, USA
| | - Christine L Hunt
- Department of Pain Medicine, Mayo Clinic, Jacksonville, Florida, USA
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Alvandi M, Shaghaghi Z, Fatehi Z, Naghshtabrizi B, Mohammadi T, Nikzad S. Exploring the impact of recent COVID-19 infection on perfusion and functional parameters derived from gated myocardial perfusion imaging in patients undergoing evaluation for coronary artery disease. Ann Nucl Med 2024:10.1007/s12149-024-01946-0. [PMID: 38806866 DOI: 10.1007/s12149-024-01946-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 05/19/2024] [Indexed: 05/30/2024]
Abstract
OBJECTIVE This study seeks to evaluate how recent COVID-19 infection affects myocardial perfusion and functional parameters derived from gated myocardial perfusion imaging in patients undergoing evaluation for coronary artery disease. The goal is to enhance our understanding of COVID-19's influence on the cardiovascular system. METHOD Conducted at Farshchian Heart Hospital from 2022 to 2023, this case-control study enrolled patients suspected of coronary artery disease, stratified into two groups: those with confirmed COVID-19 infection within the past 6 months (study group) and those without prior COVID-19 infection (control group). Employing a 2-day protocol, stress testing and gated SPECT MPI were performed. Statistical analysis included descriptive statistics, Chi-square test, Student's t test, and Mann-Whitney U test. RESULT Among the 86 patients included, 43 were in each group. Significantly higher summed stress core and summed difference score values were observed in the study group compared to the control group (p < 0.05). In addition, the study group exhibited significantly altered global left ventricular ejection fraction, end-diastolic volume, and end-systolic volume (p < 0.05). Non-perfusion findings, including transient ischemic dilation and transient right ventricular visualization, were more prevalent in the study group. CONCLUSION Recent COVID-19 infection is associated with impaired myocardial perfusion and altered functional parameters as detected by MPI. These findings underscore the intricate interplay between COVID-19 and cardiovascular health, emphasizing the importance of comprehensive evaluation and management strategies to address cardiac complications in affected individuals. Further research is warranted to elucidate the underlying mechanisms and optimize patient care in the context of COVID-19-associated cardiovascular manifestations.
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Affiliation(s)
- Maryam Alvandi
- Cardiovascular Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
- Department of Nuclear Medicine and Molecular Imaging, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Zahra Shaghaghi
- Cancer Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
| | - Zhino Fatehi
- Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Behshad Naghshtabrizi
- Clinical Research Development Unit of Farshchian Heart Hospital, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Tayeb Mohammadi
- Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
- Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Safoora Nikzad
- Department of Medical Physics, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
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Lindner O, Hacker M, Burchert W, Buechel RR. SPECT and PET myocardial perfusion imaging in Austria, Germany, and Switzerland results of the first joint survey of 2021. Eur J Nucl Med Mol Imaging 2023; 50:3602-3608. [PMID: 37452873 PMCID: PMC10547620 DOI: 10.1007/s00259-023-06336-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 07/06/2023] [Indexed: 07/18/2023]
Abstract
PURPOSE This paper presents the results of the first joint survey on the use of SPECT and PET myocardial perfusion imaging (MPI) and cardiac amyloidosis imaging in Austria, Germany, and Switzerland of the year 2021. METHODS A questionnaire was sent in 2022 to centres practicing nuclear medicine. RESULTS Data from 14 Austrian (10,710 SPECT), 218 German (133,047 SPECT), and 16 Swiss centres (11,601 MPI (6,879 SPECT, 4722 PET)) were analysed. In Austria and Germany, the PET MPI numbers were close to zero and not considered. Official MPS numbers from 2015 to 2021 from Austria and Germany revealed a decline in Austria by about 40% in the pandemic years 2020 to 2021, but an increase in Germany by 9%. Ambulatory care cardiologists represented the major referral group (56-71%). Mostly, stress tests were performed pharmacologically (58-92%). Contrary to Germany, a 1-day protocol was predominant (58-97%) in Austria and Switzerland. The leading camera systems were SPECT-CT in Austria and Switzerland (57-79%) and multi-head systems in Germany (58%). Switzerland had the highest proportion of SPECT MPI with attenuation correction (84%), followed by Austria (43%), and Germany (33%). Electrocardiogram-gated SPECT MPI showed an overall high penetration of 87-99%. Scoring was most frequently applied in Germany (72%), followed by Austria (64%), and Switzerland (60%). Related to the population, the number of cardiac amyloidosis imaging was highest in Austria, followed by Switzerland and Germany. CONCLUSIONS This first joint survey of 2021 shows considerable differences among the countries. The Swiss situation is outstanding due to the wide use of PET MPI. In terms of camera equipment, Switzerland is also leading, followed by Austria and Germany. Despite the differences in procedural issues, the results reveal an overall high standard of MPI imaging.
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Affiliation(s)
- O Lindner
- Institut für Radiologie, Nuklearmedizin und Molekulare Bildgebung, Herz- und Diabeteszentrum NRW, Georgstr. 11, Bad Oeynhausen, Germany.
| | - M Hacker
- Klinische Abteilung für Nuklearmedizin, Universitätsklinik für Radiologie und Nuklearmedizin, Medizinische Universität Wien, Vienna, Austria
| | - W Burchert
- Institut für Radiologie, Nuklearmedizin und Molekulare Bildgebung, Herz- und Diabeteszentrum NRW, Georgstr. 11, Bad Oeynhausen, Germany
| | - R R Buechel
- Klinik für Nuklearmedizin, Universitätsspital Zürich, Zurich, Switzerland
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Lindner O, Schaefer WM, Silber S, Rischpler C, Burchert W. Myocardial Perfusion SPECT and ATTR imaging 2021 in Germany: Results of the 9th Survey. Nuklearmedizin 2023; 62:235-243. [PMID: 37268009 PMCID: PMC10477021 DOI: 10.1055/a-2084-7454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/12/2023] [Indexed: 06/04/2023]
Abstract
AIM This paper presents the results of the 9th survey of myocardial perfusion SPECT (MPS) from the reporting year 2021. METHODS 218 questionnaires (131 practices (PR), 58 hospitals (HO), 29 university hospitals (UH)) were evaluated. Results of the last survey 2018 are set in squared brackets. RESULTS MPS data from a total of 133,057 [145,930] patients (-8.8%) with 131,868 [143,707] stress and 106,546 [121,899] rest MPS were analysed. A comparison with official data revealed that 54% all MPS were recorded. From 2018 to 2021, official data showed a every year an increase in MPS numbers. On average, 610 [502] MPS patients (+22%) were examined in each department. 74% [69%] of the responders reported an increase or no changes in their MPS patient numbers. Ambulatory care cardiologists represented as always, the mayor referral group (68% [69%]). For the first time, pharmacological stress was more frequently applied than ergometry (42% [51]). Regadenoson was mostly used. The use of the different protocols remained nearly unchanged. Two-day protocols were predominantly applied (49% [48%]). A shift from multi-headed cameras (58% [72%]) to SPECT-CT systems (24% [17%]) was found. Attenuation correction was performed in 33% [26%] of all MPS. 88% [86%] of all stress, 88% [87%] of all rest and 87% [83%] of all stress and rest MPS were acquired as gated SPECT. 72% [67%] of all departments performed scoring by default. The number of departments without scoring decreased to 13% [16%]. CONCLUSIONS The MPS Study 2021 shows that the long-term positive development of MPS imaging in Germany is continuing. The COVID-19 pandemia did not change this trend. The procedural and technical details of MPS imaging reveal a high level of guideline conformity.
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Affiliation(s)
- Oliver Lindner
- Institute of Radiology, Nuclearmedicine and Molecular Imaging, Heart and Diabetes Center North Rhine-Westphalia, Bad Oeynhausen, Germany
| | | | | | | | - Wolfgang Burchert
- Institute of Radiology, Nuclearmedicine and Molecular Imaging, Heart and Diabetes Center North Rhine-Westphalia, Bad Oeynhausen, Germany
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Holby SN, Richardson TL, Laws JL, McLaren TA, Soslow JH, Baker MT, Dendy JM, Clark DE, Hughes SG. Multimodality Cardiac Imaging in COVID. Circ Res 2023; 132:1387-1404. [PMID: 37167354 PMCID: PMC10171309 DOI: 10.1161/circresaha.122.321882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Infection with SARS-CoV-2, the virus that causes COVID, is associated with numerous potential secondary complications. Global efforts have been dedicated to understanding the myriad potential cardiovascular sequelae which may occur during acute infection, convalescence, or recovery. Because patients often present with nonspecific symptoms and laboratory findings, cardiac imaging has emerged as an important tool for the discrimination of pulmonary and cardiovascular complications of this disease. The clinician investigating a potential COVID-related complication must account not only for the relative utility of various cardiac imaging modalities but also for the risk of infectious exposure to staff and other patients. Extraordinary clinical and scholarly efforts have brought the international medical community closer to a consensus on the appropriate indications for diagnostic cardiac imaging during this protracted pandemic. In this review, we summarize the existing literature and reference major societal guidelines to provide an overview of the indications and utility of echocardiography, nuclear imaging, cardiac computed tomography, and cardiac magnetic resonance imaging for the diagnosis of cardiovascular complications of COVID.
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Affiliation(s)
- S Neil Holby
- Cardiovascular Medicine Fellowship, Division of Cardiology, Department of Internal Medicine (S.N.H., T.L.R., J.L.L.), Vanderbilt University Medical Center
| | - Tadarro Lee Richardson
- Cardiovascular Medicine Fellowship, Division of Cardiology, Department of Internal Medicine (S.N.H., T.L.R., J.L.L.), Vanderbilt University Medical Center
| | - J Lukas Laws
- Cardiovascular Medicine Fellowship, Division of Cardiology, Department of Internal Medicine (S.N.H., T.L.R., J.L.L.), Vanderbilt University Medical Center
| | - Thomas A McLaren
- Division of Cardiology, Department of Internal Medicine, Department of Radiology & Radiological Sciences (T.A.M., S.G.H.), Vanderbilt University Medical Center
| | - Jonathan H Soslow
- Thomas P. Graham Jr Division of Pediatric Cardiology, Department of Pediatrics (J.H.S.), Vanderbilt University Medical Center
| | - Michael T Baker
- Division of Cardiology, Department of Internal Medicine (M.T.B., J.M.D.), Vanderbilt University Medical Center
| | - Jeffrey M Dendy
- Division of Cardiology, Department of Internal Medicine (M.T.B., J.M.D.), Vanderbilt University Medical Center
| | - Daniel E Clark
- Division of Cardiology, Department of Internal Medicine, Stanford University School of Medicine (D.E.C.)
| | - Sean G Hughes
- Division of Cardiology, Department of Internal Medicine, Department of Radiology & Radiological Sciences (T.A.M., S.G.H.), Vanderbilt University Medical Center
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Lindner O, Schäfer W, Rischpler C, Silber S, Burchert W. Myocardial perfusion SPECT in Germany from 2012 to 2021: insights into development and quality indicators. Eur J Nucl Med Mol Imaging 2023; 50:1621-1628. [PMID: 36780003 PMCID: PMC9923638 DOI: 10.1007/s00259-023-06129-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 01/26/2023] [Indexed: 02/14/2023]
Abstract
PURPOSE This paper summarises the results of 4 national surveys on the numbers, utilisation and technique of myocardial perfusion SPECT (MPS) from 2012 to 2021. METHODS A one-page questionnaire for information on MPS in 2012, 2015, 2018 and 2021 was sent to German centres practising nuclear medicine. To check for representativeness, the numbers obtained were related to official annual data and furthermore to the numbers of invasive coronary angiography procedures (ICA). RESULTS MPS examinations increased by > 40% from 2012 to 2021 and showed a centralisation with increasing MPS per centre. In 2020, a mild impact of the COVID-19 pandemic could be observed in the form of only a slight MPS increase, which was compensated in the following year. Outpatient care cardiologists represent the most important referrer (70%). Mostly, 2-day protocols were used. One-day protocols and stress-only protocols showed insignificant changes. The use of exercise stress decreased steadily. In 2021, exercise stress was replaced by pharmacological stress as the most frequent stress modality. Camera systems showed a shift to more SPECT-CT systems. The use of gated SPECT increased to almost 90%. Quantitative scoring showed an increasing acceptance. The ratio of invasive coronary angiographies (ICA) to MPS was between 3.9 and 4.5. A significant proportion of ICA in the context of CCS (chronic coronary syndrome) was performed without prior testing for ischaemia. CONCLUSION The 2012 to 2021 MPS surveys reveal a continuously growing number of examinations with only a mild temporary effect of the COVID-19 pandemic and a centralisation with increasing numbers per centre. Performance and technical data reveal a high-grade adherence of MPS practice to the current ESC guideline. A large potential of non-invasive diagnostics remains for the future.
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Affiliation(s)
- O Lindner
- Institut Für Radiologie, Nuklearmedizin Und Molekulare Bildgebung, Herz- Und Diabeteszentrum NRW, Bad Oeynhausen, Germany.
| | - W Schäfer
- Klinik Für Nuklearmedizin, Kliniken Maria Hilf GmbH, Mönchengladbach, Germany
| | - C Rischpler
- Klinik Für Nuklearmedizin, Universitätsklinik Essen, Stuttgart, Germany
- Abteilung für Nuklearmedizin, Klinikum Stuttgart, Stuttgart, Germany
| | - S Silber
- Kardiologie Zentrum München, Munich, Germany
| | - W Burchert
- Institut Für Radiologie, Nuklearmedizin Und Molekulare Bildgebung, Herz- Und Diabeteszentrum NRW, Bad Oeynhausen, Germany
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Myocardial perfusion imaging in the era of COVID-19: a systematic review. Clin Transl Imaging 2022; 11:165-197. [PMID: 36536657 PMCID: PMC9750842 DOI: 10.1007/s40336-022-00531-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/04/2022] [Indexed: 12/23/2022]
Abstract
PURPOSE As COVID-19 was uncovered, it became evident that specific individuals could experience multi-organ complications for quite a while after infection. Among them, there were several cardiovascular complications. Myocardial perfusion imaging single photon emission computed tomography (MPI SPECT) can be utilized to detect and evaluate cardiac problems regardless of whether COVID caused them. By examining all publications relevant to the impacts of the pandemic on SPECT MPI imaging, we aimed to understand how the COVID pandemic affected different aspects of the MPI, how intense these effects were, and what the consequences were. METHOD On the 6th of June, 2022, a four-domain search strategy was developed and implemented by searching the following databases: PubMed, SCOPUS, EMBASE, Web of Science, and the Cochrane Central Register of Controlled Trials. The retrieved records have been put through two levels of screening. The search for forward and backward citations provided more results. RESULTS This study contained 32 papers, divided into the following three categories: 1. Case reports and series; 2. A comparison of the number of MPIs conducted before and after the pandemic; and 3. SPECT MPI findings. CONCLUSION We observed through the article review that CT scans performed in combination with MPI are crucial and should be interpreted within the context of COVID, especially during outbreaks. Moreover, we discovered that in the initial months of the pandemic, the number of SPECT MPIs performed globally decreased, with the fall being more significant in some countries, primarily in low- to middle-income regions. Lastly, we found that individuals with a history of COVID-19 may be more prone to having MPIs that demonstrate abnormalities, such as ischemia.
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Javaid A, Saleh Y, Ahmed AI, Saad JM, Malahfji M, Al-Mallah MH. Noninvasive Imaging for Patients with COVID-19 and Acute Chest Pain. Methodist Debakey Cardiovasc J 2022; 17:5-15. [PMID: 34992719 PMCID: PMC8680163 DOI: 10.14797/mdcvj.1040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 10/15/2021] [Indexed: 12/19/2022] Open
Abstract
Acute chest pain is a common presentation in patients with COVID-19. Although noninvasive cardiac imaging modalities continue to be important cornerstones of management, the pandemic has brought forth difficult and unprecedented challenges in the provision of timely care while ensuring the safety of patients and providers. Clinical practice has adapted to these challenges, with several recommendations and societal guidelines emerging on the appropriate use of imaging modalities. In this review, we summarize the current evidence base on the use of noninvasive cardiac imaging modalities in COVID-19 patients with acute chest pain, with a focus on acute coronary syndromes.
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Affiliation(s)
- Awad Javaid
- Kirk Kerkorian School of Medicine at the University of Nevada Las Vegas School of Medicine, Las Vegas, NV, US
| | - Yehia Saleh
- Houston Methodist DeBakey Heart & Vascular Center, Houston, TX, US
| | | | - Jean Michel Saad
- Houston Methodist DeBakey Heart & Vascular Center, Houston, TX, US
| | - Maan Malahfji
- Houston Methodist DeBakey Heart & Vascular Center, Houston, TX, US
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Araz M, Soydal Ç, Sütçü G, Demir B, Özkan E. Myocardial perfusion SPECT findings in postCOVID period. Eur J Nucl Med Mol Imaging 2021; 49:889-894. [PMID: 34490492 PMCID: PMC8421192 DOI: 10.1007/s00259-021-05552-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 08/29/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE To investigate if (i) the risk of ischemia on myocardial perfusion scan (MPS), (ii) number of coronary angiographies (CAG) performed, and (iii) necessity for invasive (stent implantation or coronary artery bypass grafting (CABG)) or medical treatment increased in patients infected with COVID-19. METHODS Patients who were referred to MPS between August 2020 and April 2021 with a history of active symptomatic COVID-19 infection (confirmed by PCR positivity) in the last 6 months were involved in the study group. Age-and gender-matched control group was composed of randomly chosen patients who attended for MPS between January 2019 and September 2019, before pandemic. Frequency of ischemia, CAG, and invasive or medical treatments were compared between groups. RESULTS Ischemia was reported more frequently in the study group (p < 0.001). In clinical evaluation, regardless of the MPS results, the necessity for invasive evaluation with CAG and treatment (either medical therapy or invasive interventions) was higher in the study group (p = 0.006 and p = 0.015). It was also true for patients with abnormal MPS results (p = 0.008 and p = 0.024) but not for the patients with ischemia (p = 0.29 and p = 0.06). CONCLUSION There exists a significant increase in the frequency of ischemia on MPS, undergoing CAG, stent implantation or CABG, and initiation of medical therapy in patients with a history of COVID-19 infection in the last 6 months. MPS is a reliable method in patients who present with cardiovascular symptoms in the late COVID period.
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Affiliation(s)
- Mine Araz
- Department of Nuclear Medicine, Ankara University Medical School, Ankara, Turkey.
| | - Çiğdem Soydal
- Department of Nuclear Medicine, Ankara University Medical School, Ankara, Turkey
| | - Gizem Sütçü
- Department of Nuclear Medicine, Ankara University Medical School, Ankara, Turkey
| | - Burak Demir
- Department of Nuclear Medicine, Ankara University Medical School, Ankara, Turkey
| | - Elgin Özkan
- Department of Nuclear Medicine, Ankara University Medical School, Ankara, Turkey
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