Emre Ozker

Istanbul Surgery Medical Center, İstanbul, Istanbul, Turkey

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Publications (37)48.61 Total impact

  • 02/2014; 19(4):214-217. DOI:10.5222/GKDAD.2013.214
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    ABSTRACT: Aims and Objectives: We used near-infrared spectroscopy to document changes in cerebral tissue oxygen saturation (SctO 2 ) in response to ventilation mode alterations after bidirectional Glenn (BDG; superior cavopulmonary connection) procedure. We also determined whether spontaneous ventilation have a beneficial effect on hemodynamic status, lactate and SctO 2 when compared with other ventilation modes. Materials and Methods: 20 consecutive patients undergoing BDG were included. We measured SctO 2 during three ventilator modes (intermittent positive-pressure ventilation [IPPV]; synchronized intermittent mandatory ventilation [SIMV]; and continuous positive airway pressure + pressure support ventilation [CPAP + PSV]). We, also, measured mean airway pressure (AWP), arterial blood gases, lactate and systolic arterial pressures (SAP). Results: There was no change in SctO 2 in IPPV and SIMV modes; the SctO 2 measured during CPAP + PSV and after extubation increased significantly (60.5 ± 11, 61 ± 10, 65 ± 10, 66 ± 11 respectively) ( P < 0.05). The differences in the SAP measured during IPPV and SIMV modes was insignificant; the SAP increased significantly during CPAP + PSV mode and after extubation compared with IPPV and SIMV (109 ± 11, 110 ± 12, 95 ± 17, 99 ± 13 mmHg, respectively) ( P < 0.05). Mean AWP did not change during IPPV and SIMV modes, mean AWP decreased significantly during CPAP + PSV mode (14 ± 4, 14 ± 3, 10 ± 1 mmHg, respectively) ( P < 0.01). Conclusions: The SctO 2 was higher during CPAP + PSV ventilation and after extubation compared to IPPV and SIMV modes of ventilation. The mean AWP was lower during CPAP + PSV ventilation compared to IPPV and SIMV modes of ventilation.
    Annals of Cardiac Anaesthesia 01/2014; 17(1):10-15. DOI:10.4103/0971-9784.124122
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    ABSTRACT: Thoracotomy causes severe pain in the postoperative period. Perioperative thoracic paravertebral block reduces pain score and may improve outcome after pediatric cardiac surgery. This prospective study was designed for the efficacy and duration of a single level, single injection ultrasound-guided thoracic paravertebral block (TPVB) for fifteen infants undergoing aortic coarctation repair. After approval of the ethical committee and the relatives of the patients, 15 infants who had undergone thoracotomy were enrolled in the study. The patients received 0.5 ml·kg(-1) a bolus 0.25% bupivacaine with epinephrine 1 : 200 000 at T5-6 level after standard general anesthesia induction. Anesthesia depth with Index of Consciousness (IOC) and tissue oxygen saturation with cerebral (rSO2-C) and somatic thoracodorsal (rSO2-S) were monitored. Intraoperative hemodynamic and postoperative hemodynamic and pain scores were evaluated for 24 h after surgery. Face, Legs, Activity, Cry, Consolability (FLACC) score was utilized to measure postoperative pain in the intensive care unit. Rescue 0.05 mg·kg(-1) IV morphine was applied to patients in whom FLACC was >3. The median age of the patients was 4.5 (1-11) months, and the median intraoperative endtidal isoflurane concentration was 0.6% (0.3-0.8). The amount of remifentanil used intraoperatively was 4.5 (2.5-14) μg·kg(-) (1) ·h(-1) . Intraoperative heart rate and blood pressure values significantly decreased compared with values detected at 5th, 10th, and 15th min after TPVB application, after incision prior and after cross-clamp (P < 0.01). The median time of first dose of morphine application after block was 320 (185-430) min. The median morphine consumption in 24 h was 0.16 (0.09-0.4) mg·kg(-1) . The median length of postoperative intensive care unit and in-hospital stay times was 23 (1-67) h and 4 (1-10) days, respectively. We believe that TPVB, as part of a balanced anesthetic and analgesic regime, provides effective pain relief in patients undergoing aortic coarctation repair.
    Pediatric Anesthesia 08/2013; 23(11). DOI:10.1111/pan.12252 · 1.74 Impact Factor
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    ABSTRACT: The deep hypothermic circulatory arrest (DHCA) technique has been used in aortic arch and isthmus hypoplasia for many years. However, with the demonstration of the deleterious effects of prolonged DHCA, selective cerebral perfusion (SCP) has started to be used in aortic arch repair. For SCP, perfusion via the innominate artery route is generally preferred (either direct innominate artery cannulation or re-routing of the cannula in the aorta is used). Herein, we describe our technique and the result of arch reconstruction in combination with selective cerebral and myocardial perfusion (SCMP) and short-term total circulatory arrest (TCA) (5-10 min) through ascending aortic cannulation. Thirty-seven cases with aortic arch and isthmus hypoplasia accompanying cardiac defects were operated on with SCMP and short TCA in Baskent University Istanbul Research and Training Hospital between January 2007 and Sep 2012. There were 17 cases with ventricular septal defect (VSD)-coarctation with aortic arch hypoplasia (CoAAH), 4 cases of transposition of the great arteries-VSD-CoAAH, 4 cases of Taussing Bing Anomaly-CoAAH, 2 cases complete atrioventricular canal defect-CoAAH, 3 cases single ventricle-CoAAH, 3 cases of type A interruption-VSD, 2 subvalvular aortic stenosis-CoAAH and 2 cases of isolated CoAAH. The aorta was cannulated in the middle of the ascending aorta in all cases. The cross-clamp was applied to the aortic arch distal to either the innominate artery or the left carotid artery. In addition, a side-biting clamp was applied to the descending aorta. The aorta between these two clamps was reconstructed with gluteraldehyde-treated autogeneous pericardium, using SCMP. The proximal arch and distal ascending aorta reconstructions were carried out under short TCA. The mean age of the patients was 2.5±2 months. The mean cardiopulmonary bypass and cross-clamp times were 144±58 and 43±27 minutes, respectively. The mean SCMP and descending aorta ischemia times were 22.6±4.8 and 27±6.3 minutes, respectively. Mean TCA time was 7.6±2.1 minutes (min: 4, max 10 min). The mean in-hospital stay time was 8.6±1.9 days. None of the cases operated with this technique had neurological defects. The mortality rate was 2.7% (1 patient). SCMP with aortic cannulation and short TCA (under 10 minutes) in aortic reconstruction is safe and practical in this high-risk patient group.
    Perfusion 07/2013; 29(1). DOI:10.1177/0267659113496581 · 1.08 Impact Factor
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    ABSTRACT: Background and aim: We investigated the clinical outcome of early initiated peritoneal dialysis (PD) use in our newborn patients who underwent arterial switch operation (ASO) for transposition of the great arteries (TGA) and had routine intraoperative PD catheter implantation. We determined the risk factors for PD, factors associated with prolonged PD, morbidity, and mortality. The aim of the present study was to describe our experience of using PD in this patient cohort. Materials and Methods: Eighty two patients who were diagnosed with TGA and TGA-ventricular septal defect (VSD) and who had undergone TGA correction operation in Başkent University, Istanbul Medical Research and Training Hospital between 2007 and 2012 were retrospectively investigated. All the patients were under 30 days old. PD catheters were routinely implanted intraoperatively at the end of the operation. PD was initiated in transient renal insufficiency. In the absence of oliguria and increased creatinine level, PD was established in the presence of one of the following: clinical signs of fluid overload, hyperkalemia (>5 mEq/L), persistent metabolic acidosis, lactate level above 8 mmol/L or low cardiac output syndrome. The patients were divided into two groups according to the need for postoperative PD (PD group and non-PD group). PD was initiated in 32 (39%) patients after the operation, whereas 50 (61%) patients did not need dialysis. The clinical outcomes and perioperative data of the two groups were compared. Results: The demographics in the two groups were similar. Cardiopulmonary bypass time was longer in the PD group [non-PD group, 175.24 ± 32.39 min; PD group, 196.22 ± 44.04 min (p < 0.05)]. Coronary anomaly was found to be higher in the PD group [non-PD group, n = 2 patients (4.0%); PD group, n = 7 patients (21.9%); p < 0.05]. There was more need for PD in TGA + VSD patients [simple TGA patients, n = 14; TGA + VSD patients, n = 18 (p < 0.05)]. PD rate was higher in patients whose sterna were left open at the end of the operation (p < 0.05). The ventilator time [non-PD group, 4.04 ± 1.51 days; PD group, 8.12 ± 5.21 days (p < 0.01)], intensive care unit stay time [non-PD group, 7.98 ± 5.80 days; PD group, 15.93 ± 18.31 days (p < 0.01)], and hospital stay time were significantly longer in the PD group [non-PD group, 14.98 ± 10.14 days; PD group, 22.84 ± 20.87 days (p < 0.01)]. Conclusion: We advocate routine implantation of PD catheters to patients with TGA-VSD, coronary artery anomaly, and open sternum in which we have determined high rate of postoperative PD need.
    Renal Failure 11/2012; 35(2). DOI:10.3109/0886022X.2012.745773 · 0.78 Impact Factor
  • Rıza Turkoz, Emre Ozker, Ayda Turkoz
    The Annals of thoracic surgery 11/2012; 94(5):1786-7. DOI:10.1016/j.athoracsur.2012.04.109 · 3.65 Impact Factor
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    ABSTRACT: Aneurysmal circumflex coronary artery fistula connected to the coronary sinus is a rare clinical entity that usually remains asymptomatic until later in life. The timing of surgical treatment for asymptomatic patients is crucial. The decision to leave or exclude the aneurysmatic coronary artery following ligation of the fistula is controversial. Herein, we report the successful management of a coronary fistula between the circumflex artery and the coronary sinus without using cardiopulmonary bypass during the newborn period.
    The Thoracic and Cardiovascular Surgeon 10/2012; 61(4). DOI:10.1055/s-0032-1311553 · 1.08 Impact Factor
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    ABSTRACT: Background Delayed sternal closure (DSC) after cardiac surgery is a therapeutic option in the treatment of the severely impaired heart in pediatric cardiac surgery. The results with the technique of DSC over a 4-year period are examined with regard to mortality and morbidity. Methods We retrospectively reviewed records of 38 patients who had undergone DSC among 1100 congenital cardiac operations. Indication of DSC, time to sternal closure, pre and post closure cardiopulmonary and metabolic status, mortality, rate of wound and bloodstream infections were recorded. Results The mean sternal closure time was 2.9 days. The mortality rate was 34.2% (n = 13). Twenty (52.6%) patients required prolonged antibiotic use due to postoperative infection. There was gram negative microorganism predominance. There were 4 (10.5%) patients with postoperative mediastinitis. Postoperative infection rate statistically increased with cardiopulmonary bypass time (CPBT), sternal closure time (SCT) and intensive care unit (ICU) stay time (p = 0.039;p = 0.01;p = 0.012). On the other hand, the mortality rate significantly increased with increased cross clamp time (CCT), SCT, and extracorporeal membrane oxygenation (ECMO) use (p = 0.017; p = 0.026; p = 0.03). Single ventricular physiology was found to be risk factor for mortality in delayed sternal closure (p < 0.007). Conclusions Elective DSC does not reduce the morbidity. The prolonged sternal closure time is associated with increased rate of postoperative infection rate; therefore early closure is strongly advocated.
    Journal of Cardiothoracic Surgery 10/2012; 7(1):102. DOI:10.1186/1749-8090-7-102 · 3.05 Impact Factor
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    ABSTRACT: Objective: The aim of this study was to analyze the midterm clinical results of aortic valve replacement with cryopreserved homografts. Materials and Methods: Aortic valve replacement was performed in 40 patients with cryopreserved homograft. The indications were aortic valve endocarditis in 20 patients (50%), truncus arteriosus in 6 patients (15%), and re-stenosis or regurtitation after aortic valve reconstruction in 14 (35%) patients. The valve sizes ranged from 10 to 27mm. A full root replacement technique was used for homograft replacement in all patients. Results: The 30-day postoperative mortality rate was 12.5% (5 patients). There were four late deaths. Only one of them was related to cardiac events. Overall mortality was 22.5%. Thirty-three patients were followed up for 67 +/- 26 months. Two patients needed reoperation due to aortic aneurysm caused by endocarditis. The mean transvalvular gradient significantly decreased after valve replacement (p<0.003). The last follow up showed that the 27 (82%) patients had a normal left ventricular function. Conclusion: Cryopreserved homografts are safe alternatives to mechanical valves that can be used when there are proper indications. Although it has a high perioperative mortality rate, cryopreserved homograft implantation is an alternative for valve replacement, particularly in younger patients and for complex surgical problems such as endocarditis that must be minimalized.
    Balkan Journal of Medical Genetics 06/2012; 29(2):170-3. DOI:10.5152/balkanmedj.2011.017 · 0.17 Impact Factor
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    ABSTRACT: A coronary artery anomaly precludes the use of a trans-annular patch in right ventricular outflow tract (RVOT) reconstruction. Herein we present three patients with coronary artery anomalies who underwent total corrective operations without using a conduit. Between 2007 and 2010, 84 patients with tetralogy of Fallot (TOF) were operated on. Nine (9.4%) of them had a coronary artery anomaly. Three (3.1%) of the patients were operated on using the double-outflow technique and two had a Blalock-Taussig shunt before the total corrective operation. In two patients, the left anterior descending artery (LAD) and in one, the right coronary artery (RCA) crossed the RVOT. Postoperatively, the right-to-left ventricular pressure ratios were 0.45, 0.59 and 0.60 after cardiopulmonary bypass. No gradient was detected in the RVOT in postoperative echocardiographical measurements (< 15 mmHg gradient). In all three patients, there were moderate pulmonary insufficiencies. All were discharged home on the sixth day postoperatively. Mean follow-up duration was 9.8 ± 8 months. In the follow up of all three patients, there were moderate pulmonary insufficienciencies but no right ventricular dysfunction. The 'double-outflow' technique is appropriate for TOF patients with a major coronary artery anomaly since it can easily be performed without the need of a conduit.
    03/2012; 23(2):e8-10. DOI:10.5830/CVJA-2011-004
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    ABSTRACT: We present the case of a three-month-old infant with a giant right atrial myxoma obstructing the tricuspid valve, who following haemodynamic deterioration and cardiac arrest, was operated upon as an emergency. On echocardiogram, there was a mass attached to the tricuspid annulus, in close proximity to the septal leaflet, with dimensions of 16.6 × 12.5 mm. The mass was prolapsing through the tricuspid valve into the right ventricle and obstructing the inflow. While preparing for surgery, cardiac arrest occurred, so the patient underwent an emergency operation under cardiopulmonary resuscitation. The mass was excised without damaging the tricuspid valve and the conduction system. Histologically, the mass consisted of a myxoid matrix with scatted globoid and star-shaped myxoma cells. The patient stayed 15 days in the intensive care unit and was discharged home on the 20th day postoperatively. Although accepted as a benign tumour, a myxoma can display an aggressive clinical course in infants. In centres where cardiac operations cannot be performed, these patients need to be transferred to cardiac centres as soon as possible. Whatever the clinical presentation, we advocate immediate surgical extirpation of the tumour in order to avoid any unpredictable consequences in its clinical course.
    Cardiovascular journal of Africa 02/2012; 23(1):e13-5. DOI:10.5830/CVJA-2010-099 · 0.79 Impact Factor
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    ABSTRACT: We describe a successful surgical treatment in a 2.5-year old boy with Loeys-Dietz syndrome, in whom we performed aortic arch and ascending aorta replacement with a valve-sparing operation (VSO) of the aortic root because of significant aortic insufficiency and dilation of the aortic root. We believe that VSO is ideal for treating young patients with aortic root aneurysm with normal or minimally diseased aortic cusps to avoid the disadvantages of prosthetic valve replacements.
    European journal of cardio-thoracic surgery: official journal of the European Association for Cardio-thoracic Surgery 01/2012; 41(5):1184-5. DOI:10.1093/ejcts/ezr235 · 2.81 Impact Factor
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    ABSTRACT: 34-year-old male with history of recurrent atrial fibrillation (AF) and mitral stenosis, status post radiofrequency ablation (RFA) and prosthetic mitral valve replacement two years earlier was admitted with prosthetic valve thrombosis for redo mitral valve surgery. During the surgery, a 2 x 1.5 x 1 cm mass was identified on the interatrial septum, attached to the edge of tricuspid valve's septal leaflet by a stalk. The mass was excised and histological evaluation revealed myxoma. It is accepted that myxomas can develop after cardiac trauma. It is known that RFA for AF increases the risk of thrombus or endocarditis in the atrium. Herein, we report a myxoma case where we think the heat energy caused by RFA might have triggered the development of the tumor.
    Acta chirurgica Belgica 01/2012; 112(2):154-6. · 0.44 Impact Factor
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    ABSTRACT: 1. Follow-up data of patients with simple transposition of great arteries (TGA) and TGA with ventricular septal defect (VSD), who had arterial switch operation (ASO) are compared. 2. Factors affecting mortality and morbidity after ASO are described. Seventy-six patients, who had an ASO between April 2007 and August 2010 were studied retrospectively. The patients with intact ventricular septum (IVS) (n=36) were in Group 1, and those with VSD (n=40) in Group 2. The pre and postoperative clinical and echocardiographic variables and intensive care unit (ICU) outcomes were compared among groups using Mann-Whitney U, Pearson correlation and logistic regression tests. The mean age at operation was 44.1 days, weight was 3.6±0.98 kg. Patients were followed for 15.5±11.21 months. The aortic cross-clamp (AoCC) and cardiopulmonary bypass (CPB) times were higher in patients with VSD (p=0.001, p=0.004). Patients in Group 1 had longer inotropic agent infusion (p=0.001). Length of stay in ICU was similar in two groups (p>0.05). There was no correlation between the length of stay in ICU and age, weight, CPB time, AoCC time. Aortic regurgitation was more frequent in Group 2 (p=0.02). During follow-up, 12 patients died (15.7%), and 8 patients had a revision operation (10.5%) (diaphragmatic plication in 4, pulmonary artery reconstruction in 1, recoarctation operation in 3 patients). Mortality was similar in groups (p>0.05). Arterial switch operation provides anatomical correction in TGA. Appropriate timing and good perioperative planning facilitates low morbidity and mortality in patients with VSD as in patients with simple TGA.
    Anadolu kardiyoloji dergisi: AKD = the Anatolian journal of cardiology 11/2011; 11(8):726-31. DOI:10.5152/akd.2011.195 · 0.76 Impact Factor
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    ABSTRACT: We evaluated the patients who had had a Damus-Kaye-Stansel (DKS) operation for single-ventricular physiology with the aorta originating from a hypoplastic ventricle and the pulmonary artery from the systemic ventricle. Seven patients who were operated on between May 2007 and November 2010 were evaluated retrospectively. The patients had been diagnosed with a transposed double-inlet left ventricle and triscuspid atresia, and had been waiting for a Fontan operation. Systemic outflow stenosis was defined echocardiographically as those with a gradient greater than 20 mmHg, and angiographically those with greater than 5 mmHg in the subaortic region. The mean age and weight of the patients was 15 ± 9.7 months and 8 ± 3.3 kg, respectively. The mean gradient between the systemic ventricle and the aorta was 35 ± 25 mmHg. This gradient decreased to 14.3 ± 4 mmHg postoperatively. The early hospital mortality was 14% (one patient). The mean extubation time and mean time in the intensive care unit (ICU) were 13 ± 7.3 hours and 2.2 ± 0.5 days, respectively. The mean follow-up time was 11 ± 2 months. No mortality and semi-lunar valve insufficiency were observed after discharge. One of the major problems that occur while waiting for a Fontan operation is systemic ventricular hypertrophy and deterioration in the compliance of the ventricle due to systemic ventricular outflow stenosis. When the disadvantages of outflow resection are encountered, a DKS proves to be a good alternative.
    08/2011; 23(5):252-4. DOI:10.5830/CVJA-2011-023
  • Pediatric Cardiology 07/2011; 32(8):1256-7. DOI:10.1007/s00246-011-0063-0 · 1.55 Impact Factor
  • Rıza Turkoz, Emre Ozker, Ayda Turkoz
    The Annals of thoracic surgery 07/2011; 92(1):403. DOI:10.1016/j.athoracsur.2011.03.077 · 3.65 Impact Factor
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    ABSTRACT: Recently, extra-anatomical bypass surgery has been widely used in complicated adult aortic coarctation cases with concomitant intracardiac repair. Stent implantation has been widely used for primary aortic coarctation as well. The procedure has been shown to be effective with long term follow ups. However, failed stent implantations like stent fracture and dislodgement may complicate the clinical status and subsequent surgical procedure. Extra-anatomic bypass can provide effective results and lower morbidity in cases with concomitant intracardiac problems and stent failure. Here we present an adult aortic coarctation patient who had undergone a Bentall operation and two unsuccessful stent implantations for recurrent aortic coarctation. The patient then got an extra-anatomic bypass for aortic coarctation and concomitant mitral valve commissurotomy through median sternotomy.
    VASA.: Zeitschrift für Gefässkrankheiten. Journal for vascular diseases 07/2011; 40(4):333-5. DOI:10.1024/0301-1526/a000125 · 1.21 Impact Factor
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    ABSTRACT: We wished to investigate potential causes of dialysis-induced hypotension (DIH), including the attenuated cardiovascular response to sympathetic system activation during exercise and myocardial dysfunction. This study included 26 end-stage renal disease (ESRD) patients with DIH, 30 ESRD patients without DIH (Non-DIH), and 30 control subjects. Each patient was evaluated with echocardiography and a symptom-limited treadmill stress test. The chronotropic index (CRI), heart rate recovery (HRR), systolic blood pressure response to exercise (SBP response), and tissue Doppler systolic myocardial velocities were calculated. The HRR and velocities were reduced in dialysis patients compared to controls; however, they were similar in patients with and without DIH. Patients with DIH had the lowest CRI compared to the Non-DIH group (0.62 ± 0.15 vs. 0.73 ± 0.17, p = 0.020) and controls (0.62 ± 0.15 vs. 0.86 ± 0.11, p < 0.001). Similarly, patients with DIH had the lowest SBP response values compared to the Non-DIH (34.88 ± 15.01 vs. 55.67 ± 25.42, p = 0.002) and controls (34.88 ± 15.01 vs. 59.70 ± 23.04, p < 0.001). Patients with DIH have inadequate sympathetic activity of the cardiovascular system during exercise and impaired left ventricular systolic function. Both factors could contribute to the development of hypotension during hemodialysis.
    American Journal of Nephrology 05/2011; 33(6):491-8. DOI:10.1159/000327829 · 2.65 Impact Factor

Publication Stats

51 Citations
48.61 Total Impact Points


  • 2013
    • Istanbul Surgery Medical Center
      İstanbul, Istanbul, Turkey
  • 2010–2013
    • Baskent University
      Engüri, Ankara, Turkey
  • 2012
    • University of Vienna
      • Department of Cardio-Thoracic Surgery
      Wien, Vienna, Austria
  • 2011
    • Istanbul Surgery Hospital
      İstanbul, Istanbul, Turkey
  • 2008–2010
    • Gulhane Military Medical Academy
      Engüri, Ankara, Turkey
  • 2009
    • State Hospital of Ercis, Turkey
      Arcis, Van, Turkey
  • 2007
    • Istanbul University
      • Institute of Cardiology
      İstanbul, Istanbul, Turkey
  • 2006–2007
    • Kocaeli University
      • Department of Cardiovascular Surgery
      Cocaeli, Kocaeli, Turkey