Browsing by Author "Mert, S"
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Item Evaluation of alveolo-capillary permeability in thyrotoxicosis using Tc-99m DTPA aerosol scintigraphy(Springer, 2005) Gültekin, A; Yüksel, M; Mert, S; Berkarda, FSurfactant secreted from type II pneumocytes plays an important role in alveolo-capillary permeability. In thyrotoxicosis, high levels of T3 receptors detected at these cells might affect the alveolocapillary permeability due to increased serum thyroid hormone levels. The results by CO-diffusion capacity measurement in thyrotoxicosis are conflicting. Changes in alveolo-capillary membrane permeability resulting from thyrotoxicosis are not well established yet. This prompted us to investigate the alveolo-capillary permeability in thyrotoxic patients in comparison with CO-diffusing capacity. For this aim twenty-two non-smoking thyrotoxic patients (before treatment) and fifteen healthy voluntary controls underwent Tc-99m-DTPA aerosol scintigraphy. CO-diffusing and pulmonary function tests were performed in all subjects. After ventilation of radiotracer through a nebulizer for 15 minutes, 30 dynamic images (1 frame/minute) were taken from both lungs. ROI's were drawn over both lung areas, and the time-activity curves were generated. Then clearance half time (CT1/2) for radioaerosol was obtained. CT1/2 of thyrotoxic patients did not differ from that of the controls: 77.9 +/- 25.9 min vs. 79.4 +/- 22.3 min; p > 0.05. Similar result was found for CO-diffusion parameters. Also there was no significant correlation between CT1/2 and CO-diffusion parameters. We concluded that in patients with thyrotoxicosis, the alveolo-capillary permeability is unaffected. Further experimental research is needed to establish the possible effects of thyroid hormones on alveolo-capillary membrane.Item Sequential pulmonary effects of radiotherapy detected by functional and radiological end points in women with breast cancer(Elsevier Science London, 2005) Tokatli, F; Kaya, M; Kocak, Z; Ture, M; Mert, S; Unlu, E; Alkaya, FAims: To determine the pulmonary effects of locoregional irradiation on clinical and sub-clinical radiographic and functional end points in women with breast cancer, and whether the course of these end points is affected by laterality. Materials and methods: Twenty patients (10 irradiated on the left side and 10 irradiated on the right side) were prospectively evaluated for changes in pulmonary function tests, Tc-99m DTPA (diethylenetriamine pentaacetic acid) lung clearance scintigraphy and high-resolution computed tomography (HRCT) at 6, 16 and 52 weeks after radiotherapy. Tc-99m DTPA clearance, expressed as the biological half-time, T (1/2), was computed from the time-activity curves for 10 min for each lung. The irradiated lung volume was calculated for each patient. Results: The mean irradiated lung volume was 6.4% +/- 2 (range 3-11 %) for the entire population. In the whole study population, two (10%) patients, who were irradiated on the left side, had mild symptomatic radiation pneumonitis in the follow-up period. There was a statistically significant gradual reduction in all pulmonary function test values during the follow-up period. For patients irradiated on the left side, Tc-99m DTPA clearance T-1/2 values were statistically significantly decreased during the follow-up period (P = 0.03), but the decrease was not statistically significant for patients irradiated on the right side (P = 0.62). Tc-99m DTPA clearance T-1/2 values were statistically significantly decreased in the irradiated lung compared with the opposite lung, and no improvement was seen at week 52 after radiotherapy. The number of patients with changes on HRCT scans increased after radiotherapy, reaching a maximum at 16 weeks, when 80% of patients had changes. There was subsequent partial recovery 52 weeks after radiotherapy. Conclusion: Locoregional irradiation for breast cancer may cause sub-clinical irreversible impairment of radiological and functional pulmonary parameters. The increase in clearance rate of Tc-99m DTPA may be more prominent for patients with left-sided breast cancer. Tokatli, F. et al. (2005). (C) 2005 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.
