Cihangir Uyan

Abant İzzet Baysal Üniversitesi, Claudiopolis, Bolu, Turkey

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Publications (65)104.87 Total impact

  • No preview · Article · Dec 2013
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    ABSTRACT: In chronic obstructive pulmonary disease (COPD) patients, functional and structural changes of the respiratory system greatly influence cardiovascular autonomic functions. Determining autonomic balance may be important in understanding the pathophysiology of COPD and useful clinically in the treatment of COPD patients. Heart rate variability (HRV) and heart rate turbulence (HRT) are useful tools in assessing the autonomic neurovegetative function. Our aim in this study was to evaluate the HRV and HRT variables in COPD patients. Twenty five moderate to severe COPD patients and 25 healthy subjects were included in this study. Pulmonary function tests and echocardiographic examination, arterial blood gases analysis were performed, HRV and HRT analysis were assessed from a 24-hour Holter recording. When HRV and HRT parameters were compared, COPD patients had significantly decreased sNN50 total, pNN50, SDANN, SDNN, SDNNI, rMSDD in time domain HRV parameters, and the values of the HRT onset was significantly less negative in COPD patients. Although the values of the HRT slope were lower in COPD patients, there was no significant difference between the two groups. We also found a correlation between HRT and HRV parameters. In addition to HRV parameters, HRT onset was significantly different in COPD patients. In our opinion, the combination of HRV variables and HRT onset may be simple and elegant ways of evaluating cardiac autonomic functions. New investigations of HRT and HRV in COPD patients have a potential importance for improving risk stratification and therapeutic approaches, and understanding the autonomic outcomes of the disease process.
    Full-text · Article · Nov 2009 · Cardiology journal
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    ABSTRACT: The study was conducted to evaluate the clinical and angiographic results of the implantation of the paclitaxel-eluting stent Meo:DrugStar ST in patients with symptomatic coronary artery disease. The Meo:DrugStar ST stent has a stainless steel stent platform with a homogenous non-biodegradable coating of paclitaxel mixed with a polyether-based biostable, monophase, and hemocompatible coating. Sixty patients with native coronary artery disease were included in the study. The Meo:DrugStar ST stents were implanted in 60 de novo lesions detected in these patients. Immediate and long-term clinical and angiographic follow-up results were evaluated. There was a high proportion of patients with hypertension (55%) according to JNC-VII. Mean stenosis ratio was 78 +/- 13 %, mean implanted stent diameter was 3.0 +/- 0.4 mm and mean length was 22 +/- 5 mm. Restenosis was detected in 4 (10%) of those patients and 11 (27.5%) of 40 patients had insignificant amount of restenosis. The results of this study indicate a potential benefit of the Meo:DrugStar ST stent for the prevention of stent thrombosis and restenosis in these relatively high-risk patients.
    Full-text · Article · Feb 2008 · Vascular Health and Risk Management
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    ABSTRACT: Acute aortic dissection is a medical emergency with high morbidity and mortality requiring emergent diagnosis and therapy. A 79-year-old woman with acute aortic dissection due to percutaneous coronary intervention was presented. Aortic dissection is an uncommon but potentially lethal illness that can present in an occult manner making the initial diagnosis difficult. Aggressive medical management is mandatory, as well as urgent diagnostic testing and cardiothoracic consultation. © 2008 Uyan et al, publisher and license Dove Medical Press Ltd.
    Full-text · Article · Jan 2008 · Vascular Health and Risk Management
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    ABSTRACT: Several statins inhibit T-helper 1 development and induce T-helper 2 polarization and production of T-helper 2 cytokines that promote the activation and chemotaxis of eosinophils. Whether statins promote the development of nasal polyps has so far been uncertain. No studies have evaluated the frequency of the development of nasal polyps in patients using statins. To better define the relationship of statin use to the presence of nasal polyps, the investigators explored the frequency of the development of nasal polyps in patients who were using statins. A total of 200 patients who were using statins and 200 who were not using statins (400 cases) were investigated. All patients were examined for nasal polyps by anterior rhinoscopy or investigation with a fiberoptic endoscope. In addition, immunoglobulin E levels were measured, a skin prick test was performed, and the results from the 2 groups were compared. Nasal polyps were detected in 4 subjects who were using statins, whereas 5 nasal polyps were found in the control group; differences between the 2 groups were statistically insignificant (P>.05). When the atopy status of the 2 groups was compared, prick test positivity and serum immunoglobulin E levels were found to be 15% and 44+/-31 IU/mL in the statin group and 19% and 68+/-23 IU/mL in the control group (P>.05). These results show that nasal polyposis is a multifactorial disease with several different causes; however, the frequency of the development of nasal polyps does not increase in patients who use statins.
    No preview · Article · Nov 2007 · Advances in Therapy

  • No preview · Article · Mar 2007 · The American Journal of Geriatric Cardiology
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    ABSTRACT: Familial hypercholesterolaemia (FH) is an important public health problem due to the high incidence of premature coronary artery disease leading to a reduction in life expectancy, observed in many families with FH. It is an autosomal dominant disorder caused by mutations of the LDL receptor gene. FH heterozygotes have approximately twice the normal LDL-cholesterol concentration in early childhood, and have increased risk of early myocardial infarction. In this report, a 21-year-old male patient with FH type IIa who was referred to our hospital with a diagnosis of non-Q myocardial infarction, and who underwent subsequent coronary bypass grafting after coronary angiography, was presented.
    No preview · Article · Oct 2006 · Turkiye Klinikleri Journal of Medical Sciences
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    ABSTRACT: The cardiac complications of adenotonsillar hypertrophy (ATH) have been investigated by many scientists by using supplemental diagnostic modalities such as echocardiography. But, arrhythmia analysis has not been studied adequately in patients with ATH. This study aimed at evaluating the prevalence of arrhythmias, heart rate variability (HRV) and heart rate turbulence (HRT) analyses by means of 24 h Holter ECG monitoring in pre- and post-operative periods in children with ATH. Twenty-five children with ATH consisting of 12 female and 13 male patients (mean age 66+/-15 months, range 24-108 months) included in this study. All children were assessed pre-operatively and at 1 month post-operatively with 24-h Holter monitoring and ECG analysis. The prevalence analysis of arrhythmias, heart rate variability and heart rate turbulence analysis was assessed. These data were compared. Although some ECG and holter findings such as sinusal tachycardia, Mobitz type 1 second-degree AV block improved after the operation, the prevalence of arrhythmias, HRV and HRT values were not changed significantly in post-operative period (p>0.05). Measurement of HRT and HRV are attractive and easily applicable ways of non-invasive risk prediction of cardiac complications. But, these parameters have not changed significantly in post-operative period. However, ECG and 24-h Holter monitoring of electrocardiography may be useful at evaluating the prevalence of arrhythmias and determining cardiac complications in pre-operative period.
    No preview · Article · Sep 2006 · International Journal of Pediatric Otorhinolaryngology
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    ABSTRACT: Heart rate turbulence (HRT) and heart rate variability (HRV) have been shown to be independent and powerful predictors of mortality in a specific group of cardiac patients. However, the predictive values of HRV alone is modest and information on HRV in patients with mitral valve prolapse (MVP) has so far been conflicting. In addition, no studies have previously evaluated HRT in patients with MVP. To define better the effects of MVP on cardiac autonomic function, we assessed HRT and time-domain parameters of HRV in patients with MVP. Fifty patients with MVP and 70 controls without MVP were investigated. The diagnosis of MVP was confirmed by cross-sectional echocardiography in the parasternal long-axis view and apical 4-chamber view. The HRV and turbulence analysis were assessed from a 24-hour Holter recording. When HRT parameters were compared, the values of the HRT onset and slope were significantly lower in MVP patients than in the controls group (-0.109+/-0.207 vs. -0.289+/-0.170%, P=0.001 and 8.6+/-7.2 vs. 11.5+/-7.4 ms/RRI, P=0.043, respectively) and the number of patients who had abnormal HRT onset was significantly higher in the MVP group than in controls (15 vs. 8, P=0.011). In addition, HRV parameters were not statistically different between the two groups. Although we found that the decrease in HRV parameters was not significantly different between MVP patients and controls, HRT variables (especially HRT onset) were significantly lower in MVP patients. Therefore, in our opinion, HRT is an attractive, easily applicable, and better way of non-invasive risk prediction compared with another non-invasive risk predictor, HRV.
    Full-text · Article · Aug 2006 · Europace
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    ABSTRACT: Hypothyroid patients have increased concentrations of creatinine kinase that is mostly due to increased CK-MM. However, CK-MB has also been reported to increase above reference values in hypothyroid patients without apparent myocardial damage. This may create confusion during the evaluation of myocardial injury in a hypothyroid patient presenting with chest pain. Troponin I is considered as a superior marker for the diagnosis of myocardial infarction in hypothyroid patients. However, there are some reports showing an increase in the level of troponin I without any myocardial damage in hypothyroid patients as in our case. In this report, we present a 47 years old male hypothyroid patient who had chest pain, abnormal electrocardiographic findings and increased cardiac enzymes suggesting acute coronary syndrome although he had normal coronary arteriogram.
    No preview · Article · May 2006 · The International Journal of Cardiovascular Imaging
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    ABSTRACT: Subclinical hypothyroidism (SH) is a mild form of thyroid failure, associated with initial signs of cardiovascular hypothyroidism. Tissue Doppler echocardiography (TDE) is a new and powerful method in evaluation of both regional and global systolic or diastolic ventricular function. We aimed to investigate the use of TDE in evaluation of cardiac effects of SH and affect of thyroid hormone replacement therapy (TRT) on tissue Doppler parameters of SH patients. Twenty-two patients who were diagnosed as SH and 22 healthy, age and sex-matched cases were included in the study. Conventional echocardiography and TDE were performed in all individuals. TRT was started in SH group. On the achievement of euthyroid state echocardiography were repeated. Septal annulus relaxation time was significantly higher in SH group (82+/-21, 98+/-11 ms, p=0.024). Lateral annulus and myocardial relaxation times, precontraction/contraction ratios and precontraction times were also slightly higher. Septal lateral annulus and lateral myocardial relaxation times were decreased after TRT (98+/-11 vs. 81+/-12, p<0.001, 89+/-14 vs. 78+/-11, p=0.022, 90+/-16 vs. 80+/-14 ms, p=0.008, respectively). Precontraction times and precontraction/contraction ratios decreased after TRT but did not reach the significance level. There was a positive correlation between TSH and TDE relaxation times. TDE is a powerful tool in diagnosis and follow-up of SH patients and TRT inhibits adverse affects of SH on myocardium. Septal myocardium is the most affected region of left ventricle in SH. The relaxation time is the best criteria of cardiac involvement and monitoring the effect of TRT.
    No preview · Article · Apr 2006 · The International Journal of Cardiovascular Imaging
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    ABSTRACT: We aimed to evaluate effect of acetylsalicylic acid on the prevalence of nasal carriage of Staphylococcus aureus. Patients were orally administered a prophylactic dose of acetylsalicylic acid and then were compared with control subjects. The prevalence of nasal carriage of S. aureus was significantly lower among patients who received acetylsalicylic acid than among the control subjects (P<.001).
    No preview · Article · Apr 2006 · Infection Control and Hospital Epidemiology
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    ABSTRACT: Dislodgement and embolisation of the new generation of coronary stents before deployment are rare. If it is impossible to withdraw the embolised stent from the coronary artery, the stent may be crushed into the side wall of the coronary artery with a balloon over a wire passed alongside the embolised stent.
    No preview · Article · Feb 2006 · International Heart Journal
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    Full-text · Article · Feb 2006 · Emergency Medicine Journal
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    Full-text · Article · Feb 2006 · Texas Heart Institute journal / from the Texas Heart Institute of St. Luke's Episcopal Hospital, Texas Children's Hospital
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    ABSTRACT: Thyroid gland dysfunction affects the structure and function of the heart. Tissue Doppler echocardiography is a new technique, and it has been used frequently in the evaluation of ventricular function. In the present study, right ventricular function was assessed in patients with overt or subclinical hypothyroidism and hyperthyroidism and in healthy subjects using the tissue Doppler method, and results were compared. 20 healthy subjects and 63 patients diagnosed with overt and subclinical hypothyroidism and hyperthyroidism were included in the study. Annular and myocardial systolic peak velocities, early and late diastolic peak velocities, precontraction, total contraction and relaxation times of the right ventricle were recorded by tissue Doppler echocardiography. The results of the patients were compared to those of the controls. Myocardial systolic velocity was significantly higher in patients with hyperthyroidism. Annular and myocardial late diastolic velocities were found to be significantly lower in patients with overt hypothyroidism. Annular precontraction time was increased in patients with overt and subclinical hypothyroidism. Myocardial precontraction time was decreased in patients with hyperthyroidism, and increased in patients with overt hypothyroidism patients. Annular relaxation time was increased in patients with overt hypothyroidism. Right ventricular function is affected in patients with thyroid diseases. The tissue Doppler technique is a suitable tool to detect impairments in right ventricular function. There is a significant correlation between serum thyroid hormone levels and right ventricular velocities and time intervals.
    No preview · Article · Feb 2006 · Cardiology

  • No preview · Article · Dec 2005 · Echocardiography
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    ABSTRACT: The aim of this study was to evaluate the reliability of mitral regurgitation color M-mode regurgitant flow propagation velocity (RFPV) in grading mitral regurgitation (MR). We prospectively examined 52 consecutive patients with grades of MR mild in 10 patients, moderate in 19 patients, and severe in 23 patients with quantitative pulse Doppler echocardiography. MR was evaluated by vena contracta diameter (VCD), regurgitant jet area (RJA), and RFPV. These qualitative and quantitative methods were compared with the pulsed Doppler quantitative flow measurements and concordance of these three methods was determined. The mean RFPV for mild, moderate, and severe MR were 26.4 +/- 7 cm/sec, 43.3 +/- 7 cm/sec, and 60.3 +/- 7.3 respectively (P < 0.001). RFPV is highly sensitive and moderately specific in differentiating mild and severe MR from other subgroups. Sensitivity and specificity were 92.1%-64.3% for mild and 100%-68.5% for severe MR, respectively. Significant correlation was observed between pulse Doppler quantitative grades, RFPV, VC, and RJA (P < 0.0001, r = 0.87; P < 0.0001, r = -0.84; P < 0.0001, r = 0.76, respectively). This results show that RFPV is a reliable and simple semiquantitative new method that can be used for determining severity of MR.
    Full-text · Article · Oct 2005 · Echocardiography
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    ABSTRACT: We sought to clarify the possible role of elastic properties of the ascending aorta in the development of cardiac disease associated with hypothyroidism (HT). A total of 37 patients with HT (age: 39.3 +/- 8.9 years) and 29 control subjects were studied. Ascending Aortic (Ao) diameter, Ao elastic indexes, strain (AoST), distensibility (AoD), stiffness index (AoSI), and pressure strain modulus were calculated from the echocardiographically derived Ao diameters. Myocardial performance index (MPI), E/A ratio, isovolumetric relaxation time (IVRT), deceleration time (DT) were measured by Doppler echocardiography to assess diastolic LV function. Patients were treated with levothyroxine and followed-up for 6 months. Thyroid function tests and echocardiographic measurements were repeated at the end of the study. AoD (cm2 dyn(-1) 10(-3)) and AoST (%) were significantly lower (3.8 vs. 6.1; P < 0.001, 7.4 vs. 12.6, P < 0.001; respectively), whereas AoSI was higher in HT patients (6.2 vs. 3.3; P < 0.001). After treatment, AoD and AoST were increased (5.7; P < 0.001 and 11.8; P < 0.001; respectively), whereas AoSI was decreased significantly (3.7; P < 0.001). Also, early/late mitral peak velocity ratio (Emax/Amax) was significantly lower in HT patients (1.19 vs 1.34; P < 0.01), whereas MPI was higher (0.52 vs. 0.42; P < 0.001). MPI showed a strong correlation with aortic root indexes [AoST (r =-0.61/P < 0.001); AoD, (r =-0.57/P < 0.002); AoSI, (r = 0.53/P < 0.005)] in the HT group. After 6 months of therapy, MPI significantly decreased P < 0.001) and E/A ratios were normalized (P < 0.001). Ao root functions have an important role on diastolic LV function. Levothyroxine replacement therapy can reverse all of these adverse effects of HT.
    No preview · Article · Sep 2005 · Echocardiography
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    ABSTRACT: Silent myocardial ischemia is recognized as a common manifestation after percutaneous coronary interventions possibly due to induction of coronary artery spasm. A 54-year-old man was performed primary percutaneous transluminal coronary angioplasty with the diagnosis of acute myocardial infarction. His 18-hour control electrocardiogram showed big-notched inverted T waves in precordial, III, and aVF leads without any chest pain. These bizarre electrocardiographic findings were restored after a brief period indicating silent ischemia that is caused by coronary artery spasm.
    No preview · Article · Aug 2005 · Journal of Electrocardiology

Publication Stats

639 Citations
104.87 Total Impact Points


  • 2002-2008
    • Abant İzzet Baysal Üniversitesi
      • Faculty of Medicine
      Claudiopolis, Bolu, Turkey
  • 1993-1994
    • Gulhane Military Medical Academy
      • • Gülhane Military Medical Academy
      • • Department of Nuclear Medicine
      Engüri, Ankara, Turkey