Person: YILMAZ, ZEKİ
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YILMAZ
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ZEKİ
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Publication Effect of pimobendan in the treatment of pulmonary hypertension in a cat with giant right atrium(Kafkas Univ, Veteriner Fakultesi Dergisi, 2020-09-01) Tanaka, Ryou; Levent, Pınar; Sarıl, Ahmet; SARIL, AHMET; Kocatürk, Meriç; KOCATÜRK, MERİÇ; Yilmaz, Zeki; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/Dahiliye Anabilim Dalı.; 0000-0002-2849-1222; 0000-0001-9836-0749; V-5578-2017; A-9637-2008Publication Estimation of pulmonary arterial wave reflection by echo-doppler: A preliminary study in dogs with experimentally-induced acute pulmonary embolism(Frontiers Media Sa, 2021-12-08) Yoshida, Tomohiko; Uejima, Tokuhisa; Komeda, Syunta; Matsuura, Katsuhiro; Uemura, Akiko; Hayama, Hiromasa; Yamashita, Takeshi; Tanaka, Ryou; Yilmaz, Zeki; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veteriner Fakültesi.; 0000-0003-4311-9311; 0000-0002-6047-2865; 0000-0003-2671-5074; 0000-0001-6702-7150; 0000-0002-2544-8464; 0000-0001-9836-0749; 0000-0001-9948-6490; HQY-9709-2023; CAH-7393-2022; AHB-6165-2022; A-9637-2008; M-3078-2019Background: Pulmonary arterial (PA) wave reflection provides additional information for assessing right ventricular afterload, but its applications is hampered by the need for invasive pressure and flow measurements. We tested the hypothesis that PA pressure and flow waveforms estimated by Doppler echocardiography could be used to quantify PA wave reflection.Methods: Doppler echocardiographic images of tricuspid regurgitation and right ventricular outflow tract flow used to estimate PA pressure and flow waveforms were acquired simultaneously with direct measurements with a dual sensor-tipped catheter under various hemodynamic conditions in a canine model of pulmonary hypertension (n = 8). Wave separation analysis was performed on echo-Doppler derived as well as catheter derived waveforms to separate PA pressure into forward (Pf) and backward (Pb) pressures and derive wave reflection coefficient (RC) defined as the ratio of peak Pb to peak Pf.Results: Wave reflection indices by echo-Doppler agreed well with corresponding indices by catheter (Pb: mean difference = 0.4 mmHg, 95% limits of agreement = -4.3 to 5.0 mmHg; RC: bias = 0.13, 95% limits of agreement = -0.25 to 0.26). RC correlated negatively with PA compliance.Conclusion: This echo-Doppler method yields reasonable measurement of reflected wave in the pulmonary circulation, paving the way to a more integrative assessment of pulmonary hemodynamics in the clinical setting.Publication Role of two-dimensional speckle-tracking echocardiography in early detection of left ventricular dysfunction in dogs(Mdpi, 2021-08-07) Hamabe, Lina; Mandour, Ahmed S.; Shimada, Kazumi; Uemura, Akiko; Yılmaz, Zeki; Nagaoka, Kentaro; Tanaka, Ryou; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/İç Hastalıkları Anabilim Dalı.; 0000-0001-9836-0749; A-9637-2008Simple Summary Two-dimensional speckle-tracking echocardiography represents an advanced imaging technique that allows the analysis of global and regional myocardial function, cardiac rotation and synchronicity using deformation imaging. It has gained growing importance over the last decade, especially in human medicine as a method of evaluating myocardial function. This review aims to give an overview of the current understanding of this technique and its clinical applicability in the field of veterinary medicine with a focus on early detection of left ventricular dysfunction in dogs. Two-dimensional speckle-tracking echocardiography (2D-STE) is an advanced echocardiographic technique based on deformation imaging that allows comprehensive evaluation of the myocardial function. Clinical application of 2D-STE holds great potential for its ability to provide valuable information on both global and regional myocardial function and to quantify cardiac rotation and synchronicity, which are not readily possible with the conventional echocardiography. It has gained growing importance over the past decade, especially in human medicine, and its application includes assessment of myocardial function, detection of subclinical myocardial dysfunction and serving as a prognostic indicator. This review illustrates the fundamental concepts of deformation analysis and gives an overview of the current understanding and its clinical application of this technique in veterinary medicine, with a focus on early detection of left ventricular (LV) dysfunction in dogs.Publication Identification of serum proteins in dogs naturally infected with Anaplasma phagocytophilum and Borrelia burgdorferi: A pilot study(Hellenic Veterinary Medical Soc, 2021-10-01) Martinez, L. F.; Escribano, D.; Schanilec, P.; Martinez-Subiela, S.; Tvarijonaviciute, A.; Ceron, J. J.; Yilmaz, Z.; Kocatürk, M.; Levent, P.; Sarıl, A.; SARIL, AHMET; Cihan, H.; Yilmaz, Zeki; YILMAZ, ZEKİ; Yalcin, E.; YALÇIN, EBRU; Bursa Uludağ Üniversitesi/Veteriner Fakültesi; 0000-0001-9836-0749; 0000-0002-6697-6079; ; ACP-9956-2022; A-9637-2008; ACP-9956-2022Serum proteomic analysis would aid in better understanding the pathophysiology of several diseases. The aim of this study was to identify the serum proteomes of dogs with anaplasmosis and Lyme disease using a pro-teomic approach. Diseases were diagnosed by a commercial rapid in-clinic ELISA. Borrelia antibodies were evaluated by IFAT. Four groups were designated: symptomatic dogs with anaplasmosis (n=5), dogs with Lyme disease (n=5), dual-positive dogs (n=5), and healthy control dogs (n=5). Serum samples were collected before treatment. Two-dimen-sional electrophoresis of pooled samples in each group were run in triplicate. Ten out of 57 differentially expressed spots between groups were evaluated for identification by mass spectrometry. Compared to those of controls, levels of vitamin D-binding protein (VDBP), glycoprotein-9 (GP9) and kininogen-1 (KGN-1) decreased, while haptoglobin (Hp) and immunoglobulin (Ig) heavy chain levels increased in dual infection group. Serum apolipoprotein-A1 (Apo-A1) levels decreased in dogs with anaplasmosis, Lyme disease and dual in-fections compared to those in control dogs. Serum clusterin levels decreased in dogs with anaplasmosis but were not differentially expressed in dogs with Lyme disease or dogs with dual infections compared to those in control dogs. Calpain-3 decreased in dogs with anaplasmosis and Lyme disease. This study showed that many protein levels might be changed in dogs with naturally acquired anaplasmosis and Lyme disease. Understanding the role of these proteins in different biological processes can provide information of interest for diagnostic and therapeutic approaches for these clinical conditions.Publication Choline or cdp-choline restores hypotension and improves myocardial and respiratory functions in dogs with experimentally-induced endotoxic shock(Elsevier, 2021-10-27) Ozarda, Yesim; Ceron, Jose Joaquin; Buturak, Ali; Ulus, Ismail H.; Kocaturk, Meric; KOCATÜRK, MERİÇ; Yilmaz, Zeki; YILMAZ, ZEKİ; Cansev, Mehmet; CANSEV, MEHMET; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Farmakoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Veteriner Fakültesi.; 0000-0002-2849-1222; 0000-0001-9836-0749; 0000-0003-2918-5064; 0000-0002-8654-1793; H-9043-2015; D-5340-2015; V-5578-2017; A-9637-2008Endotoxin shock is associated with severe impairments in cardiovascular and respiratory functions. We showed previously that choline or cytidine-5 '-diphosphocholine (CDP-choline) provides beneficial effects in experimental endotoxin shock in dogs. The objective of the present study was to determine the effects of choline or CDPcholine on endotoxin-induced cardiovascular and respiratory dysfunctions. Dogs were treated intravenously (i.v.) with saline or endotoxin (LPS, 0.1 mg/kg) 5 min before i.v. infusion of saline, choline (20 mg/kg) or CDP-choline (70 mg/kg). Blood pressure, cardiac rate, myocardial and left ventricular functions, respiratory rate, blood gases, serum electrolytes and cardiac injury markers were determined before and at 0.5-48 h after endotoxin. Plasma tumor necrosis factor alpha (TNF-alpha), high mobility group box-1 (HMGB1), catecholamine and nitric oxide (NO) levels were measured 2 h and 24 h after the treatments. Endotoxin caused immediate and sustained reductions in blood pressure, cardiac output, pO2 and pH; changes in left ventricular functions, structure and volume parameters; and elevations in heart rate, respiratory rate, pCO2 and serum electrolytes (Na, K, Cl, Ca and P). Endotoxin also resulted in elevations in blood levels of cardiac injury markers, TNF-alpha, HMGB1, catecholamine and NO. In choline- or CDP-choline-treated dogs, all endotoxin effects were much smaller in magnitude and shorter in duration than observed values in controls. These data show that treatment with choline or CDP-choline improves functions of cardiovascular and respiratory systems in experimental endotoxemia and suggest that they may be useful in treatment of endotoxin shock in clinical setting.Publication Changes in the pulmonary artery wave reflection in dogs with experimentally-induced acute pulmonary embolism and the effect of vasodilator(Mdpi, 2021-07-01) Yoshida, Tomohiko; Mandour, Ahmed S.; Matsuura, Katsuhiro; Shimada, Kazumi; El-Husseiny, Hussein M.; Hamabe, Lina; Yılmaz, Zeki; Uemura, Akiko; Tanaka, Ryou; Yılmaz, Zeki; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veterinerlik Fakültesi.; 0000-0001-9836-0749; A-9637-2008Simple Summary Pulmonary hypertension (PH) remains a fatal disease, despite the advances in disease-specific therapies. This may be because the assessment of pulmonary hemodynamics in PH has not been established. Recently, several studies have reported that the pulmonary arterial wave reflection (PAWR) might influence the right ventricular afterload and could provide additional information regarding the severity and progression of PH. However, the pathophysiology of PAWR has some unclear points particularly in the case of acute pulmonary embolism (APE). The objective of this study was to investigate, for the first time, the characteristics of PAWR in a dog model of APE using dual-tipped sensor wire. From the result of the present study, after dogs developed PH by injections of dextran microsphere, PAWR was increased significantly along with the pulmonary vascular resistance (PVR) and reduced after vasodilator administration. In addition, PAWR was significantly correlated with PVR and right ventricular fractional area of change (FAC). These results indicating that PAWR may be useful as a new evaluation method in PH and may detect changes related to right ventricular afterload earlier than pulmonary artery pressure (PAP). Pulmonary hypertension (PH) is a complex syndrome that has been frequently diagnosed in dogs and humans and can be detected by Doppler echocardiography and invasive catheterization. Recently, PAWR attracts much attention as a noninvasive approach for the early detection of PH. The present study aims to investigate the PAWR changes in acute pulmonary embolism (APE) and highlight the response of PAWR variables to vasodilator therapy in dogs. For this purpose, anesthesia and catheterization were performed in 6 Beagle dogs. After that, APE was experimentally conducted by Dextran microsphere administration, followed by vasodilator (Nitroprusside; 1 mu g/kg/min/IV) administration. The hemodynamics, echocardiography, PVR and PAWR variables were evaluated at the baseline, after APE and after administration of nitroprusside. The result showed a significant increase in PVR, PAP, tricuspid regurgitation (TR) as well as PAWR variables following APE induction compared with the baseline (p < 0.05). Vasodilation caused by administration of nitroprusside reduced the mean atrial pressure, PVR and PAWR parameters. There were a significant correlation and linear regression between PAWR indices and PVR as well as right ventricular function parameters. In conclusion, PAWR is not only correlated with PVR but also the right ventricular function parameter, which indicates that PAWR may be useful as a new evaluation method in PH, considering that PAWR can assess both right ventricular afterload and right ventricular function.Publication Non-invasive assessment of pulmonary artery wave reflection in dogs with suspected pulmonary hypertension(Frontiers Media Sa, 2021-07-09) Yoshida, Tomohiko; Matsuura, Katsuhiro; Seijirow, Goya; Uemura, Akiko; Yılmaz, Zeki; Tanaka, Ryou; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Tıp Fakültesi/İç Hastalıkları Anabilim Dalı; 0000-0001-9836-0749; A-9637-2008Background: Pulmonary arterial wave reflection (PAWR) occurs when the forward blood flow out the right ventricle is reflected by the pulmonary arterial tree, generating a backward wave. PAWR assessed by cardiac catheterization has been used to obtain information regarding pulmonary artery hemodynamics in pulmonary hypertension (PH) in people. However, diagnostic cardiac catheterization is not commonly used in small animal medicine because it is invasive and requires anesthesia. Hypothesis/Objective: To investigate whether PAWR can be assessed non-invasively in dogs with suspected PH using Doppler echocardiography, based on wave intensity analysis (WIA). In addition, the method was validated in a dog model of acute pulmonary embolism. Animals: Fifty-one client-owned dogs with tricuspid valve regurgitation were included in the clinical study (35 with suspected PH and 16 without echocardiographic evidence of PH) and eight healthy beagle dogs were included in the validation study. Methods: PAWR was assessed by separating pulmonary artery pulse pressure waveforms, which were estimated from the flow profile of tricuspid regurgitation, into forward (Pf) and backward pressures (Pb) using WIA. Reflection coefficient (RC) was defined as the ratio of peak Pb to peak Pf. We investigated the relationships between RC, cause, and survival time in dogs with suspected PH. In addition, we performed a validation study to compare PAWR obtained by cardiac catheterization and PAWR by Doppler echocardiography in dogs with experimentally-induced PH. Results: RC was significantly higher in dogs with suspected PH than in dogs without echocardiographic evidence of PH (0.18 +/- 0.13 vs. 0.59 +/- 0.21, P < 0.001). A characteristic reflected waveform appeared depending on the cause of PH. Kaplan-Meier survival curves showed that dogs with RC > 0.48 had a significantly shorter survival time than dogs with RC <0.48 (x(2) = 9.8, log-rank test, p = 0.0018, median survival time 353 days vs. 110 days). In the validation study, RC obtained by Doppler echocardiography was significantly correlated with RC obtained by cardiac catheterization (r = 0.81, P < 0.001). Conclusions: PAWR analysis performed by echocardiography seems feasible in dogs and could provide useful information for classification and prognosis in canine PH.Publication The utility of intraventricular pressure gradient for early detection of chemotherapy-induced subclinical cardiac dysfunction in dogs(Mdpi, 2021-04-08) Matsuura, Katsuhiro; Shiraishi, Kenjirou; Mandour, Ahmed S.; Sato, Kotomi; Shimada, Kazumi; Goya, Seijirow; Yoshida, Tomohiko; Kitpipatkun, Pitipat; Hamabe, Lina; Uemura, Akiko; Yılmaz, Zeki; Ifuku, Mayumi; Iso, Takeshi; Takahashi, Ken; Tanaka, Ryou; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/İç Hastalıkları Anabilim Dalı.; 0000-0001-9836-0749; A-9637-2008Simple SummaryCardiotoxicity is a serious side effect of doxorubicin in cancer patients due to the risk of development of heart failure. Early detection of doxorubicin-induced cardiomyopa-thy (DXR-ICM) has become a major objective to reduce heart failure in cancer patients. Echocar-diography is the gold standard method to diagnose cardiac diseases when cardiac dysfunction is prominent; however, it still cannot predict or early diagnose heart failure before functional de-cline. The intraventricular blood flow is characterized by intraventricular pressure gradients (IVPG) that created due to the suction of blood by the ventricles. Currently, advanced imaging techniques allow non-invasive assessment of IVPG from color M-mode echocardiography (CMME) after image processing for the clinical setting. Studies revealed that IVPG indices are promising for the early diagnosis of cardiac dysfunction. In this study, we aimed to investigate the usefulness of IVPG to detect cardiac function changes after DXR administration in dogs.Early detection of doxorubicin (DXR)-induced cardiomyopathy (DXR-ICM) is crucial to improve cancer patient outcomes and survival. In recent years, the intraventricular pressure gradient (IVPG) has been a breakthrough as a sensitive index to assess cardiac function. This study aimed to evaluate the usefulness of IVPG for the early detection of chemotherapy-related cardiac dysfunction. For this purpose, six dogs underwent conventional, speckle tracking, and color M-mode echocardiography concomitantly with pressure-and-volume analysis by conductance catheter. The cardiac function measurements were assessed before DXR administration (baseline, Pre), at the end of treatment protocol (Post), and at 1.5 years follow-up (Post2). The result showed a significant reduction in the left ventricular end-systolic pressure-volume (Emax: 4.4 +/- 0.7, 6.1 +/- 1.6 vs. 8.4 +/- 0.8 mmHg/mL), total-IVPG (0.59 +/- 0.12, 0.62 +/- 0.15 vs. 0.86 +/- 0.12 mmHg), and mid-IVPG (0.28 +/- 0.12, 0.31 +/- 0.11 vs. 0.48 +/- 0.08 mmHg), respectively in Post2 and Post compared with the baseline (p < 0.05). Mid-to-apical IVPG was also reduced in Post2 compared with the baseline (0.29 +/- 0.13 vs. 0.51 +/- 0.11). Meanwhile, the fraction shortening, ejection fraction, and longitudinal strain revealed no change between groups. Total and mid-IVPG were significantly correlated with Emax (R = 0.49; p < 0.05, both) but only mid-IVPG was a predictor for Emax (R-2 = 0.238, p = 0.040). In conclusion, this study revealed that impairment of contractility was the initial changes observed with DXR-ICM in dogs and only IVPG could noninvasively detect subclinical alterations in cardiac function. Color M-mode echocardiography-derived IVPG could be a potential marker for the early detection of doxorubicin cardiomyopathy.Publication Gerbode defect in a dog(Czech Academy Agricultural Sciences, 2019-01-01) Agudelo, Carlos F.; Crha, Michal; Yılmaz, Zeki; Lukac, Branislav; YILMAZ, ZEKİ; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/İç Hastalıkları Anabilim Dalı.; 0000-0001-9836-0749; A-9637-2008An intracardiac communication between the left ventricle and the right atrium (Geborde defect) was diagnosed in a 9-year Yorkshire Terrier with a history of chronic exercise intolerance. The history, clinical examination, and diagnostic imaging confirmed the diagnosis and did not reveal evidence of trauma or endocarditis which could lead to this special type of left-to-right shunting. A Gerbode defect is a very rare finding in human beings and animals. In the veterinary literature all reports about this condition were related to thoracic trauma or valvular infection. According to the authors, this would be the first clinical case of congenital Geborde defect in a dog.Publication Ventricular septal defect and pulmonic stenosis in a dog(Kafkas Univer, Veteriner Fakultesi Dergisi, 2019-09-01) Uemura, Akiko; Tanaka, Ryou; Yılmaz, Zeki; YILMAZ, ZEKİ; Levent, Pınar; Sarıl, Ahmet; SARIL, AHMET; Kocatürk, Meriç; KOCATÜRK, MERİÇ; 0000-0001-9836-0749; 0000-0003-2671-5074; 0000-0002-2849-1222; 0000-0001-9948-6490; V-5578-2017; M-3078-2019; T-1481-2019; A-9637-2008
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