Wos İndeksli Açık & Kapalı Erişimli Yayınlar

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Author: search.filters.author.Ozyildiz, Ali Gokhan

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    Role of myocardial strain and rotation for predicting prosthetic aortic valve stenosis
    (2021) Ozyildiz, Afag; Pirat, Bahar; Ozyildiz, Ali Gokhan; Muderrisoglu, Haldun; 0000-0003-0679-9434; 34626295; D-2856-2015
    Pressure overload due to aortic stenosis leads to subclinical left ventricular (LV) dysfunction and global longitudinal strain (GLS) impairment even if ejection fraction is preserved. However, little is known about LV mechanics in aortic prosthetic valve (APV) stenosis. The study aimed to determine the role of myocardial strain and rotation in predicting prosthetic valve stenosis in mechanical APV patients. 60 patients with mechanical APV and 30 healthy individuals were evaluated. APV patients were analyzed in two groups; aortic valve mean gradient < 20 mmHg (27 normal gradient patients) and >= 20 mmHg (33 high gradient patients). Strain, rotation, and twist values were assessed using the speckle tracking method, and brain natriuretic peptide (BNP) levels were measured. Four-chamber (p < 0.001) and two-chamber (p = 0.008) longitudinal strain (LS) were higher in the control group. GLS was lower in the high gradient group than control and normal gradient groups (p < 0.001, p = 0.022). LS of lateral wall's basal and mid segments were lower in normal and high gradient groups than the control group (p = 0.003, p = 0.008). While basal rotation was lower in the high gradient group than the control group (p = 0.048), there was no difference between the groups in terms of apical rotation, and twist. BNP levels were significantly different between the groups (p = 0.048). No correlation was found between aortic valve mean gradient and GLS, basal rotation, and BNP. In conclusions, LV GLS and basal rotation are depressed in high APV gradient patients; however, these parameters are not independent predictors of gradient increment.
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    Pheochromocytoma: An overlooked reversible cause of heart failure with reduced ejection fraction
    (2021) Coner, Ali; Ozyildiz, Ali Gokhan; 0000-0002-5711-8873; 34523598; ABD-7321-2021
    Pheochromocytoma is a rare, benign tumor of adrenal medulla, and its clinical symptoms are related to catecholamine production. Clinical presentation may vary in a broad spectrum. Dilated or hypertrophied cardiomyopathies are the possible clinical outcomes of pheochromocytoma. Pheochromocytoma should be kept in mind in the differential diagnosis where resistant hypertension, palpitations, headache, and sweating accompany cardiomyopathy. Excessive adrenergic stimulation causing catecholamine discharge can trigger hypertension crisis, pulmonary edema, and myocardial necrosis. Here in this report, we aimed to present the case of a patient with pheochromocytoma related cardiomyopathy who was totally recovered after surgical excision of the tumor.