Initial flow of tissue conditioners — influence of composition and structure on gelation

The effects of the molecular weight of polymer powders, the ethyl alcohol content of the liquids, the type of plasticizer and the polymer powder/liquid ratio on viscoelastic properties during gelation of tissue conditioners were studied with an oscillating rheometer. The results showed that:

• (i)

    The gelation time decreased exponentially with increases in molecular weight of the polymer powder and with powder/liquid ratio. There were linear relationships between the log of gelation time, and both the molecular weight of the polymer powder and the powder/liquid ratio.
• (ii)

    In general, gelation time decreased exponentially with increases in ethyl alcohol content. However, the relationship between the log of the gelation time and ethyl alcohol content fitted a second-order polynomial.
• (iii)

    The type of plasticizer affected gelation time. The order of gelation times was: benzyl benzoate < dibutyl phthalate < butyl phthalyl butyl glycolate.

The initial flow of tissue conditioners could be controlled over a wide range by varying the molecular weight of the polymer powders, the ethyl alcohol content, the powder/liquid ratio and the type of plasticizer.     

Setting properties of alginate impression materials in dynamic viscoelasticity

summary The viscoelastic properties of three alginate impression materials were investigated. A landmark of working time was calculated using a raw phase–time curve. A landmark of setting time was calculated from an inflection point of the divided difference of the first order in the share modulus–time curve. As a result, the working time was common at the point of δ=45° in variable frequencies. The mean value was obtained with less deviation. The setting times obtained were similar for variable frequencies, The mean values showed a distinct difference for each impression material.     

Risk factors in past histories and familial episodes related to development of testicular germ cell tumor

BACKGROUND: A retrospective study was conducted to examine the host factors of 240 testicular germ cell tumor patients. This study was performed to address a new theory proposed by Skakkebaek called testicular dysgenesis syndrome which claims that cryptorchism, hypospadias, poor semen quality and testicular germ cell tumors are symptoms of an underlying testicular dysgenesis in uterus. METHODS: The past health histories and familial episodes of 240 testicular germ cell tumor patients were examined. The past health histories included cryptorchism, hypospadias, infertility, atrophic testis and inguinal hernia. RESULTS: Of the 240 patients, 13 (5.4%) had a history of cryptorchism or orchidopexy. Two (0.8%) showed existence of hypospadias or had experienced urethroplasty. Among 129 married couples, 104 (80.6%) couples were fertile. Three (1.3%) patients developed testicular tumors after they were diagnosed as infertile or came to the hospital with the complaints of infertility. Four (1.7%) had contralateral atrophic testis. 19 (7.9%) had experienced inguinal herniorrhaphy before age 15. Three (1.3%) had testicular germ cell tumor patients among their family or relatives. CONCLUSIONS: The testicular germ cell tumor patients showed a considerable incidence of complications such as cryptorchism, hypospadias and incomplete closure of processus vaginalis. Cryptorchism, perinatal factors and familial factors could be risks for developing testicular germ cell tumors.     

Relevance of postcatheter removal incontinence to postoperative urinary function after radical prostatectomy

AIM: We examined whether postoperative urinary function after radical prostatectomy is associated with immediate incontinence just after catheter removal. PATIENTS AND METHODS: The current study included 80 patients with clinically localized prostate cancer, who underwent radical retropubic prostatectomy between January 2002 and May 2004. The amount of immediate incontinence was measured with a 24-h pad test just after catheter removal. The patients were categorized into the three groups based on the stratified grade of immediate urinary incontinence: groups I (0 g; 47 patients), II (1-99 g; 23 patients) and III (100 g and above; 10 patients), respectively. Urinary function and bother were assessed by a self-administered questionnaire using the University of California Los Angeles, Prostate Cancer Index at baseline, and at 3, 6 and 12 months postoperatively. The differences in scores of urinary function, bother and clinicopathological parameters were assessed in the three groups with one-way analysis of variance. RESULTS: No significant difference was observed in the clinicopathological parameters in the three groups. Preoperatively significant difference of urinary function scores was not evident and that of urinary bother scores was not observed in the three groups. Postoperatively urinary function scores were significantly different throughout the postoperative periods investigated, whereas difference in urinary bother scores observed at 3 months tended to disappear with time. CONCLUSION: Postcatheter removal incontinence might be related to postoperative urinary function after radical prostatectomy, although further investigation is necessary regarding the criteria for categorization because of a small number of the patients.     

Neuroleptic-induced Meige's syndrome following akathisia: Pharmacologic characteristics

A 52-year-old schizophrenic patient acutely showed blepharospasm and oromandibular dystonia following neuroleptic-induced akathisia. She had suffered from schizophrenia and been treated with neuroleptics for 15 years and had manifested tardive dyskinesia 5 years ago. Following a change in her neuroleptic medication, severe akathisia developed. Two days after the appearance of akathisia, blepharospasm and oromandibular dystonia appeared. After the disappearance of akathisia, the disorder continued. The frequency of blepharospasm ranged from 30 to 40 (times/min). The oral administration of trihexyphenidyl (6 mg/day), perphenazine (12 mg/day), and fluphenazine (12 mg/day) significantly decreased the frequency of blepharospasm, whereas carbamazepine (600 mg/day) and sulpiride (1200 mg/day) did not. These results suggest that overactivity of both cholinergic and dopaminergic functions in the striatum may be involved in this patient. Our patient, who showed acute onset of Meige's syndrome following neuroleptic-induced akathisia, is of interest to those studying the pathogenesis of Meige's syndrome.     

2{alpha},3{alpha}-Epithio-5{alpha}-androstan-17{beta}-yl 1-Methoxycyclopentyl Ether in the Treatment of Advanced Breast Cancer --A Preliminary Clinical Trial--

A new orally active anti-estrogenic steroid, 2,3-epithio-5-androstan-17ß-yl1-methoxycyclopentyl ether (10364-S) was given to 41 advancedbreast cancer patients. Most patients were given a daily doseof 20 mg. The study was preliminary and not a controlled trialusing an already proven androgenic steroid. The remission rateon giving this compound to advanced breast cancer was 11/41or 26.8% and the average duration of the remission was 10.5months. Hoarseness (8/41, 19.5%) and hirsutism (5/41, 12.2%) were relativelyoften seen as virilizing side effects. No unfavorable effectson the hematopoietic organs, the liver or on calcium metabolismwere recognized in the study.     

Reduced liver function is the trigger for renal sodium retention following portal vein ligation in the rat

Sodium retention along with peripheral vasodilation are features of prehepatic portal hypertension. In several models of experimental liver damage, sodium retention occurs only when hepatic function, measured by the aminopyrine breath test (ABT-k), falls below a critical threshold. The relationship between renal sodium handling, ABT-k and systemic and renal haemodynamics in partial portal vein ligated (PVL) rats was examined to test the hypothesis that peripheral vasodilation was responsible for initiating sodium retention. Haemodynamic measurements were conducted early after surgery in portal hypertensive rats with and without sodium retention and in sham-operated controls. Compared with control, both PVL groups of rats had elevated portal pressure and lower peripheral vascular resistance (P<0.05). Sodium retaining-PVL rats had both lower ABT-k (0.95 ± 0.05 vs 1.38 ± 0.06 times 10^-2/min; P<0.05) and higher sodium balance (1.38 ± 0.09 vs 0.43 ± 0.09 mmol/day; P< 0.05) than non-sodium retaining PVL rats. No differences in plasma renin activity or noradrenaline concentrations were observed. In a separate group of rats, hydralazine-induced peripheral vasodilation did not induce sodium retention. These results suggest that the presence of peripheral vasodilation alone is not sufficient to trigger a sodium-retaining status. A factor, probably liver function-dependent, acting directly on renal tubules may be necessary for changes in renal sodium handling in this model.     

Evaluation of Xerotomography for Diagnosing Peripheral-Type Lung Lesions

The diagnostic value of the xerotomogram was evaluated in comparisonwith that of the conventional tomogram in 55 patients with peripheral-typelung lesions, who were operated on. Thickened drainage bronchi,pleural retraction and infiltrative or expanding margins ofthe lesions were visualized more clearly by the xerotomogram.The xerotomogram was also useful for examining the pathologicalthickening of bronchial walls, and the ratio of third orderbronchi (inner diameter/outer diameter) in the patients withpathologically thickened walls was below 0.6, which was significantlyless than that observed in normal bronchi. The positive pictureof the xerotomogram was useful for revealing the linear structuresin the peripheral lung field. These data indicate that the xerotomogram is useful for examiningthe detailed features of peripheral-type lung lesions. The X-rayskin dose of the xerotomogram, however, is about 10 times thatof the conventional tomogram. Therefore, attention should bepaid to the indications for the xerotomogram.     

Selected Slow Pathway Ablation in a Patient with Corrected Transposition of the Great Arteries and Atrioventricular Nodal Reentrant Tachycardia

AVNRT in Corrected TGA. We report the first known case of AV nodal reentrant tachycardia (AVNRT) associated with a corrected transposition of the great arteries to be treated successfully by ablation of the slow pathway. Triple AV nodal pathways were observed in the anterograde direction and two types of AVNRT were induced. Input of the fast pathway to the AV node was located at the anterior portion of the left-sided A V annulus, while the input of the intermediate and slow pathways was located at the anteroseptal portion of the right-sided AV annulus. Radiofrequency energy ablation at the right anteroseptal site eliminated the intermediate and slow pathways.