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Biomedical subjects

H Ozcan

Publications and source records attributed to H Ozcan.

26 records · Page 2Linked to original sources
PubMed1991

Investigation of seasonal variations in cow serum retinol and beta-carotene by high performance liquid chromatographic method.

1. High performance liquid chromatography (HPLC) was used to determine beta-carotene and retinol in cow serum. 2. Two groups of state and private farm cows (Groups 1 and 2) were used to assess seasonal variation when different food sources were fed to cows on serum beta-carotene and retinol concentrations. 3. Mean serum concentrations of beta-carotene and retinol from October to April in both Groups 1 and 2 cows were lower (P less than 0.05) than in the other months when the cows were fed various combination of maize silage, alfalfa and carrot residues and grass hay, respectively. 4. Mean serum beta-carotene and retinol concentrations in June and July were higher (P less than 0.05) than in other months when the cows were in pasture. 5. Mean serum beta-carotene and retinol concentrations in May, August and September were lower (P less than 0.05) than in June and July and higher (P less than 0.05) than in other months when a lesser amount of green pasture was available to the cows. 6. There was a seasonal variation (P less than 0.05) in serum beta-carotene and retinol concentrations. When the carotene intake is very high, conversion of beta-carotene to retinol decreases. Mean monthly serum beta-carotene and retinol concentrations showed that combination of alfalfa hay and maize silage, and grass hay and carrot residues can maintain adequate serum beta-carotene and retinol concentrations during the dry season.

Animals↗
PubMedDate not supplied

Comparison of four different types of osteotomes for lateral osteotomy: a cadaver study.

In this study, four different types of osteotomes were compared in lateral osteotomy of cosmetic rhinoplasty. For this purpose, 32 halves of 16 cadavers were used. Fracture line and mucosal injuries were evaluated. Statistical analyses were made to find out if there is any relation between the type of osteotomes and the extent of injury. At the same time bone thickness was measured on the osteotomy line. Wide osteotomes have shown more mucosal injuries which is statistically significant. Bone thickness does not exceed 3 mm at any point on the osteotomy lines.

Cadaver↗
PubMedDate not supplied

The effect of asphyxia on gut blood flow in term neonates.

Transcutaneous Doppler ultrasound measurements were made of the superior mesenteric artery of 25 term infants to correlate the intestinal blood flow with neonatal acid-base status as measured in umbilical artery blood and newborn condition as reflected by Apgar score. Compared with the babies whose umbilical artery pH was higher than 7.20 (peak systolic velocity: 84.1 cn/sn, mean velocity 48.6 cm/sn), the blood flow of superior mesenteric artery was significantly decreased in the newborn babies whose umbilical artery pH was less than 7.20 (peak systolic velocity 48.8 cm/sn, mean velocity = 32.6 cm/sn). Although no such relationship existed between Apgar scores and superior mesenteric artery blood flow indices, a significant linear correlation between superior mesenteric artery blood flow and umbilical artery pH was noted. A reduction of intestinal circulation was observed during umbilical cord blood acidemia and hypoxemia.

Asphyxia Neonatorum↗
PubMedDate not supplied

Intrarenal varices in portal hypertension: demonstration by color Doppler imaging.

The gray-scale ultrasonographic appearances of dilated intrarenal vascular structures may mimic peripelvic cysts or hydronephrosis. We report a patient with portal hypertension in whom color Doppler ultrasound was found to be a very practical imaging technique in demonstrating varices of the renal segmental veins.

Female↗
PubMedDate not supplied

Deep venous thrombosis of the extremity diagnosed by color Doppler ultrasonography after isolated limb perfusion.

AIM: Isolated limb perfusion (ILP) is used to treat locally advanced sarcoma and melanoma of the extremities. ILP is associated with a 1.7% to 10% incidence of deep venous thrombosis (DVT). The aim of the study was to examine the effect of ILP on the peripheral venous system and to evaluate the diagnostic accuracy of color Doppler ultrasonography (US). METHODS: A total of 26 patients with locally advanced sarcoma or melanoma of the extremities received a total of 38 ILP. The patients were evaluated preoperatively and postoperatively by color Doppler US as a noninvasive venous measurement. We used a color Doppler US system (SSA-270A, Toshiba) with a 7.5-MHz linear transducer for gray-scale imaging and a 5-MHz vascular transducer for color Doppler imaging. RESULTS: Seventeen patients underwent single ILP while the others were treated with multiple ILPs. Color Doppler US showed a reflux flow in three (7.9%) patients and DVT occurred subsequently in these patients. CONCLUSIONS: Color Doppler US is a noninvasive and clinically useful diagnostic technique in the diagnosis of extremity DVT. We recommend anticoagulant therapy in patients with reflux on ultrasonographic examination.

Adult↗
PubMedDate not supplied

Effect of hormone replacement therapy on ocular hemodynamics in postmenopausal women.

PURPOSE: To evaluate the effect of hormone replacement therapy on ocular hemodynamics in postmenopausal women. METHODS: Ocular Doppler ultrasonography was performed in 20 postmenopausal women on hormone replacement therapy (HRT) and in 20 women without treatment, as the control group. Central retinal artery (CRA), posterior ciliary artery (PCA) and ophthalmic artery (OA) flow velocities and vascular resistances were measured prospectively by a radiologist blinded to the therapy. There were no associated systemic or ocular diseases or any medication history. RESULTS: The mean age of the patients on HRT was 50.05 +/- 4.5 yrs (range 44-62). The mean age of the control group was 52.8 +/- 4.09 yrs (range 46-65). The mean duration of HRT was 1.6 +/- 1.4 yrs (range 3 months - 5 years). There were no differences between the groups in terms of flow velocities, vascular resistivities or pulsatility indices of OA, CRA and PCA (p>0.05). CONCLUSIONS: HRT is essential in postmenopausal women for relief of vasomotor symptoms, cardioprotection and prevention of osteoporosis. Even though vaso-occlusive complications of hormone preparations have been reported, we did not observe any changes in ocular hemodynamics detectable with Doppler ultrasonography.

Adult↗