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Biomedical subjects

Hasan Güven

Publications and source records attributed to Hasan Güven.

6 recordsLinked to original sources
PubMed2006

The number of endothelial progenitor cell colonies in the blood is increased in patients with angiographically significant coronary artery disease.

OBJECTIVES: The objective of this study was to determine whether the number of endothelial progenitor cells (EPCs) and circulating angiogenic cells (CACs) in peripheral blood was associated with the presence and severity of coronary artery disease (CAD) in patients undergoing coronary angiography. BACKGROUND: Previous studies have suggested an inverse relationship between levels of circulating EPCs/CACs and the presence of CAD or cardiovascular risk factors, whereas other studies have observed increased numbers of EPCs in the setting of acute ischemia. However, the criteria used to identify specific angiogenic cell subpopulations and methods of evaluating CAD varied in these studies. In the present study, we used rigorous criteria to identify EPCs and CACs in the blood of patients undergoing coronary angiography. METHODS: The number of EPCs and CACs were measured in the blood of 48 patients undergoing coronary angiography. Patients with acute coronary syndromes were excluded. RESULTS: Compared with patients without angiographically significant CAD, the number of EPCs was increased (1.11 +/- 2.50 vs. 4.01 +/- 3.70 colonies/well, p = 0.004) and the number of CACs trended higher (175 +/- 137 vs. 250 +/- 160 cells per mm(2), p = 0.09) among patients with significant CAD. The highest levels of EPCs were isolated from patients subsequently selected for revascularization (5.03 +/- 4.10 colonies/well). CONCLUSIONS: In patients referred for coronary angiography, higher numbers of EPCs, and a trend toward higher numbers of CACs, were associated with the presence of significant CAD, and EPC number correlated with maximum angiographic stenosis severity. Endothelial progenitor cell levels were highest in patients with CAD selected for revascularization.

Cell Count↗
PubMed2006

A case of Henoch-Schönlein purpura and rheumatic carditis with complete atrioventricular block.

Henoch-Schönlein purpura is the most common systemic vasculitis during childhood. Many antigenic stimuli and infectious agents have been proposed as a trigger of the disease. Group A beta-hemolytic streptococcus is the most common proposed infectious agent as a trigger for Henoch-Schönlein purpura. We report a 9-year-old boy who has Henoch-Schönlein purpura and acute rheumatic fever with complete atrioventricular block.

Acute Disease↗
PubMed2005

The bicuspid aortic valve.

The bicuspid aortic valve affects 1 to 2% of the population and may be complicated by aortic stenosis or aortic insufficiency and infective endocarditis. The bicuspid aortic valve is associated with abnormalities of the aortic wall such as coarctation of the aorta, aortic dissection, and aortic aneurysm. Most patients with a bicuspid aortic valve will develop some complication during life. Individuals with a bicuspid valve may be unaware of its presence and are at risk for unsuspected complications. Aortic wall abnormalities associated with bicuspid aortic valve are due to cystic medial necrosis. This process is associated with increased metalloproteinase activity and apoptosis of vascular smooth muscle cells. The clinical correlates of aortopathy in the bicuspid aortic valve include significant enlargement of the ascending aorta with aneurysm formation and dissection. This process continues after valve replacement. The person with bicuspid aortic valve requires continuous surveillance to treat associated lesions and prevent complications.

Aortic Valve↗
PubMed2005

Noninvasive evaluation of a cutting balloon entrapped in a left main coronary artery using transesophageal echocardiography.

There are reports in the literature describing the utility of transesophageal echocardiography (TEE) in the evaluation of the coronary arteries. Studies have also shown the value of TEE in patients undergoing coronary intervention such as assessing coronary anatomy and flow following angioplasty. We report an interesting case where TEE helped to establish the location of a fractured cutting balloon device lodged in the left main coronary artery and obviated the need for cardiac surgery to remove the fractured balloon catheter. To our knowledge, this is the first case report of this type of complication utilizing a cutting balloon device.

Angioplasty, Balloon↗
PubMed2002

Stiffness of the abdominal aorta in obese children.

Obesity is pathogenically related to clinical and subclinical disorders that contribute to the development of atherosclerotic plaques and their complications leading to onset of cardiovascular events. Arterial stiffness may be an indicator of early vascular changes signaling the development of vascular disease. The purpose of this study was to assess the stiffness of the abdominal aorta using transthoracic echocardiography in normotensive obese and hypertensive obese pediatric patients and a control group. The study group consisted of 25 healthy children (M/F: 13/12) as a control group (Group I), 25 normotensive obese children (M/F: 13/12) (Group II) and 25 hypertensive obese children (M/F: 14/11) (Group III). The mean ages were 12.1 +/- 1.8, 11.9 +/- 1.5 and 12.4 +/- 1.4 years, respectively. Aortic strain (S), pressure strain elastic modulus (Ep) and normalized Ep (Ep*) measurements were significantly different in the hypertensive obese group, and cholesterol levels and body mass index were higher in this group. These findings may be important in determining the relationship between obesity and cardiovascular risk factors at pediatric age.

Algorithms↗