Browsing by Author "Acar, Goksel"

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The Prognostic Value of Combined Fractional Flow Reserve and Timi Frame Count Measurements in Patients With Stable Angina Pectoris and Acute Coronary Syndrome
(Wiley-blackwell, 2010) Esen, Ali M.; Acar, Goksel; Esen, Ozlem; Emiroglu, Yunus; Akcakoyun, Mustafa; Pala, Selcuk; Turkmen, Muhsin
Background: The aim of this study was to evaluate the prognostic value of different fractional flow reserve (FFR) cutoff values and corrected thrombolysis in myocardial infarction frame (TIMI) count ( CTFC) measurements in a series of consecutive patients with moderate coronary lesions, including patients with unstable angina, myocardial infarction, and/or positive noninvasive functional test findings. Methods: We included 162 consecutive coronary patients in whom revascularization of a moderate coronary lesion was deferred based on a FFR value >= 0.75. Patients were divided according to the results of the intracoronary pressure and flow measurements into four groups: group A: 0.75 < FFR < 0.85 and CTFC > 28 (n = 22), group B: 0.75 < FFR < 0.85 and CTFC < 28 (n = 55), group C: 0.85 < FFR and CTFC > 28 (n = 19), and group D: 0.85 < FFR and CTFC < 28 (n = 66). Adverse cardiac events and the presence of angina were evaluated at follow-up. Results: At a mean follow-up of 18 +/- 10 months, cardiac event rate in patients with 0.75 < FFR < 0.85 and FFR > 0.85 were 22% and 9%, respectively (P = 0.026) and also, a trend was observed toward a higher cardiac event rate in case of an abnormal CTFC (CTFC > 28) compared to a normal CTFC (24% vs 12%, P = 0.066). Furthermore, a significantly higher cardiac event rate was observed when group A was compared to group D (31.8% vs 7.6%, respectively, P = 0.004). Conclusion: Patients with potential microvascular dysfunction and borderline FFR values should be interpreted with caution, and management strategies should be guided not only by pressure measurement, but also by possibly supplementary clinical risk stratification and noninvasive tests. (J Interven Cardiol 2010;23:421-428).
Uric Acid as a Marker of Oxidative Stress in Dilatation of the Ascending Aorta
(Oxford Univ Press, 2011) Esen, Ali M.; Akcakoyun, Mustafa; Esen, Ozlem; Acar, Goksel; Emiroglu, Yunus; Pala, Selcuk; Barutcu, Irfan
BACKGROUND Increased serum uric acid (UA) has been shown to directly promote oxidative stress. Recent studies point toward a role for oxidative stress in the pathogenesis of ascending aortic aneurysms (AscAAs). This study was designed to examine the relationship between serum UA concentrations, total antioxidant reductive capacity, and AscAAs. METHODS The serum UA concentrations, total antioxidant reductive capacity were compared in 60 patients with ascending aortic dilatation (ectasia group (3.8-4.3 cm), 34 patients; aneurysmal group (>= 4.4cm), 26 patients) vs. 30 control subjects. The patients were evaluated by a complete transthoracic echocardiographic examination including measurement of the aortic dimensions. RESULTS The serum UA concentration and total antioxidant reductive capacity were significantly higher in patients with AscAAs. In multiple linear regression analysis, hypertension and serum UA concentration were significantly associated with aortic dilatation (beta = 0.3, P=0.03; beta = 0.15, P < 0.001, respectively). CONCLUSIONS In conclusion, we found that serum UA concentration and total antioxidant capacity (TAC) were significantly associated with aortic dilatation. The higher serum UA concentration may be responsible for the elevated serum antioxidant capacity that was observed among individuals with AscAA. Large-scale epidemiological studies conducted over several years are required to correlate the cross-sectional findings from this study with clinical outcome.