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Öğe Comparison of first and second heart sounds after mechanical heart valve replacement(TAYLOR & FRANCIS LTD, 2013) Altunkaya, Sabri; Kara, Sadik; Gormus, Niyazi; Herdem, SaadetdinIn this article, the spectral features of first heart sounds (S1) and second heart sounds (S2), which comprise the mechanical heart valve sounds obtained after aortic valve replacement (AVR) and mitral valve replacement (MVR), are compared to find out the effect of mechanical heart valve replacement and recording area on S1 and S2. For this aim, the Welch method and the autoregressive (AR) method are applied on the S1 and S2 taken from 66 recordings of 8 patients with AVR and 98 recordings from 11 patients with MVR, thereby yielding power spectrum of the heart sounds. Three features relating to frequency of heart sounds and three features relating to energy of heart sounds are obtained. Results show that in comparison to natural heart valves, mechanical heart valves contain higher frequency components and energy, and energy and frequency components do not show common behaviour for either AVR or MVR depending on the recording areas. Aside from the frequency content and energy of the sound generated by mechanical heart valves being affected by the structure of the lungsthorax and the recording areas, the pressure across the valve incurred during AVR or MVR is a significant factor in determining the frequency and energy levels of the valve sound produced. Though studies on native heart sounds as a non-invasive diagnostic method has been done for many years, it is observed that studies on mechanical heart valves sounds are limited. The results of this paper will contribute to other studies on using a non-invasive method for assessing the mechanical heart valve sounds.Öğe DOES PREOPERATIVE ADMINISTRATION OF ALLOPURINOL PROTECT THE LUNGS FROM ISCHEMIA-REPERFUSION INJURY OCCURED DURING CARDIOPULMONARY BYPASS?(SPRINGER TOKYO, 2009) Ergene, Neyhan; Gormus, Zulfikare Isik; Celik, Jale Bengi; Gormus, Niyazi; Solak, Hasan[Abstract not Available]Öğe Effects of secondary amyloidosis on arteriovenous hemodialysis fistula outcomes and intradialytic hypotension: A case-control study(WILEY-BLACKWELL, 2012) Solak, Yalcin; Caymaz, Memduh; Tonbul, Halil Zeki; Ozbek, Orhan; Turkmen, Kultigin; Gormus, NiyaziAmyloid fibrils can affect vascular structure through deposition and by causing nitric oxide depletion and increase of asymmetric dimethyl arginine. Patients with amyloidosis are prone to development of hypotension. Hypotension may also affect the maturation of arteriovenous fistula (AVF) and may set the stage for formation of thrombosis and fistula failure. Thus, we aimed to evaluate effects of secondary amyloidosis on AVF outcomes and intradialytic hypotension. This is a case-control study which included 20 hemodialysis patients with amyloidosis and 20 hemodialysis patients without amyloidosis as control group. All patients underwent Doppler ultrasound of AVF. A thorough fistula history and baseline laboratory values along with episodes of intradialytic hypotension and blood pressure measurements were recorded. There was no difference between the groups regarding age, gender, body mass index, presence of comorbidities, hypertension, and drug use. Systolic and diastolic blood pressures were similar (119 +/- 28/75 +/- 17 and 120 +/- 14/75 +/- 10?mmHg for patients with and without amyloidosis, respectively). Intradialytic hypotension episodes were also similar. Patients with amyloidosis had significantly lower serum albumin and higher C-reactive protein values compared to control hemodialysis patients. AVF sites and total number of created fistulas were similar in both groups. Flow rates of current functional AVFs were not different between the groups (1084 +/- 875 and 845 +/- 466?mL/minute for patients with and without amyloidosis, respectively, p:0.67). Patency duration of first AVF was not different between the groups. Clinical fistula outcomes and rate of intradialytic hypotension episodes were not significantly different between patients with and without secondary systemic amyloidosis.Öğe The First Case Report of a Metastatic Myxoid Liposarcoma Invading the Left Atrial Cavity and Pulmonary Vein(FORUM MULTIMEDIA PUBLISHING, LLC, 2011) Dogan, Umuttan; Zamani, Adil; Gormus, Niyazi; Paksoy, Yahya; Avunduk, Mustafa Cihat; Demirbas, SonerMyxoid liposarcoma (MLS) is the most commonly encountered liposarcoma subgroup, accounting for about 50% of all cases. Metastatic MLS of the heart is extremely rare. Herein we describe for the first time metastasis of MLS to the left atrium and left upper pulmonary vein in a 54-year-old woman who was admitted with shortness of breath and cough persisting for 2 weeks. The patient reported that a total surgical excision of MLS of the left thigh followed by radiotherapy was performed 4 years ago. An emergency operation was performed due to rapidly progressive worsening of clinical condition and echocardiographic determination of left atrial mass protruding into the left ventricle and obstructing the mitral inflow throughout the diastole. The mass could not be totally excised because it was tightly adhered to the surrounding tissue. Postoperative magnetic resonance imaging (MRI) showed a 5 x 3 cm residual tumor deforming the posterior wall of the left atrium entirely and extending into the left upper pulmonary vein. Histopathological examination was consistent with MLS. In conclusion, considering probable cardiac metastasis in patients presenting with respiratory symptoms with medical history of soft tissue sarcomas would be life saving. The case is discussed, and a review of the literature in relation to the metastatic involvement of the heart by MLS is presented.Öğe Penis replantation after self-mutilation(SPRINGER, 2009) Ozturk, Ahmet; Kilinc, Mehmet; Guven, Selcuk; Gormus, Niyazi; Belviranli, Metin; Kaynar, Mehmet; Arslan, MehmetIn this case report, the procedure of penis replanting and its complications after genital self-mutilation in a male adult are explained.
