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Öğe Metamorphic Properties of Western Part of Ankara Melange(1991) Çelik, M.Clay mineralogy and organic maturation methods were applied to pre-Mesozoic and early Mesozoic aged units of Ankara melange, which has previously been described as melange with metamorphic blocks, limestone blocks and ophiolitic blocks. In this study, melange with metamorphic blocks were named as Kusunlar formation and melange with limestone blocks as Elmadag melange. In the investigation area, bo parameter and illite crystallinities of the rock samples showed the existence of distinct metamorphic characteristics between Kusunlar formation and Elmadag melange. Evaluation of the obtained data gave such clues that the both units had different degrees of metamorphism and effects of metamorphism have progessively increased from NE to NW. It can be concluded that the units were deposits in an accretionary prism. -from English summaryÖğe QT Dispersion Ratio in Patients With Unstable Angina Pectoris (A New Risk Factor?)(CLINICAL CARDIOLOGY PUBL CO, 1997) Cin, V. G.; Çelik, M.; Ulucan, S.Background: QT dispersion has been shown to be associated with fatal arrhythmias and sudden death in coronary artery disease. A recent study indicated that marked QT dispersion in electrocardiograms (ECGs) obtained during acute ischemia demonstrated a significant correlation with ventricular fibrillation. Hypothesis: This study investigated the ECG parameters for repolarization (QT dispersion, corrected QT, corrected QT dispersion, and QT dispersion ratio) and their interrelation with acute ischemia. Methods: QT parameters as well as a newly developed repolarization index, QT dispersion ratio [(QT dispersion/RR interval)x100] were calculated digitally during rest and ischemia in 32 patients with coronary artery disease (rest angina, Braunwald class III). Results were correlated with clinical consequences, mainly arrhythmias, within a follow-up period of 5 +/- 2 days. Results: While most patients had an increase in all four parameters, only the QT dispersion ratio showed a significant difference when correlated with ventricular arrhythmias (p < 0.001,F ratio = 38). Conclusion: QT dispersion ratio appears to be a new and promising parameter in predicting ventricular arrhythmias in patients with acute ischemia.Öğe Relationship Between QRS Score and the Extent of Coronary Artery Disease(INT HEART JOURNAL ASSOC, 1997) Gökhan, V.; Çelik, M.; Ulucan, S.We studied 92 patients to determine the relationship between the QRS treadmill score (QTS) and extent of coronary artery disease. The results were compared to those of ST segment deviation in a <(+)QRS score> population. A cut off point of < 5 mm was used for mild to moderate risk patients whereas a QTS of < 3 was considered high risk for the patients.(5)) 43% of the patients had high risk QTS and 57% mild to moderate QTS. A highly significant correlation was observed between the extent of coronary artery disease and the high risk group of patients, whereas nonsignificant changes were observed in the control group (p < 0.001). Finally, the results indicate that in patients with a (+) QTS score (< 5 mm), coronary artery disease was significant and accordingly extensive during coronary angiography. On the other hand, a (+) QRS score proved to be superior to ST deviation in predicting critical coronary stenoses in the same population (F ratio; 41 vs 24).
