Treatment of atrial tachycardia arising after superior transseptal approach mitral valve surgery: Insights from ultra-high-density mapping to prevent atrioventricular block.

INTRODUCTION: Mitral valve surgery employing a superior transseptal approach (STA) is associated with arrhythmogenicity and intra-atrial conduction delay, despite being optimal for visualization of the surgical field. It is sometimes difficult to treat atrial tachycardias (AT) that arise after STA. To investigate AT circuits that arise after STA in detail in order to identify the optimal ablation line, using ultra-high-resolution mapping (UHRM). METHODS: We retrospectively analyzed 12 AT from 10 patients (median age 70 years, nine males) who had undergone STA surgery. The tachycardias were mapped using the Rhythmia mapping system (Boston Scientific, Natick, Massachusetts). RESULTS: The 12 STA-related AT (STA-AT) circuits were classifiable as follows according to location of the optimal ablation line: (1) peri-septal incision STA-AT (n = 3), (2) cavotricuspid isthmus (CTI) dependent STA-AT (n = 7), and (3) biatrial tachycardia (n = 2). Radiofrequency (RF) application terminated 11 of the 12 STA-AT. We found that difference in STA-AT circuit type was due to characteristics of the septal incision line made for STA. UHRM was important in identifying optimal ablation sites that did not create additional conduction disturbances in the right atrium (RA). CONCLUSIONS: ATs after STA involve complex arrhythmia circuits due to multiple and long incision lines in the RA. Accurate understanding of the arrhythmia circuit and sinus conduction in the RA after STA is recommended for treating post-surgical tachycardia in a minimally invasive manner.

Inhibition of ammonium assimilation restores elongation of seminal rice roots repressed by high levels of exogenous ammonium.

Elongation of seminal and lateral roots of rice seedlings was markedly inhibited by high ammonium levels in growth medium. However, high exogenous nitrate concentrations had little inhibitory effect on root growth. The objective of this study was to elucidate the relationship between inhibition of rice root growth induced by high ammonium conditions and ammonium assimilation in the seedlings. Activity of glutamine synthetase (GS) was kept at a low level in the seminal roots of the seedlings grown under high nitrate levels. In contrast, high ammonium levels significantly enhanced the GS activity in the roots, so that Gln abundantly accumulated in the shoots. These results indicate that ammonium assimilation may be activated in the seminal roots under high ammonium conditions. Application of methionine sulfoximine (MSO), an inhibitor of GS, relieved the repression of the seminal root elongation induced by high ammonium concentrations. However, the elongation of lateral roots remained inhibited even under the same condition. Furthermore, MSO drastically increased ammonium level and remarkably decreased Gln level in the shoots grown under high ammonium conditions. These results show that, for rice seedlings, an assimilatory product of ammonium, and not ammonium itself, may serve as an endogenous indicator of the nitrogen status involved in the inhibition of seminal root elongation induced by high levels of exogenous ammonium.

[Clinical evaluation and antimicrobial susceptibilities of cases of gonococcal urethritis treated in our hospital].

We reviewed the results of clinical examinations conducted on and antimicrobial susceptibilities to Neisseria gonorrhoeae isolated from 51 patients with gonococcal urethritis who visited our hospital during the period from February 2005 to April 2006. The type of sexual activity by which the bacteria was transmitted was oral sex in 81.6% (40/49) of the patients, and none of the patients used a condom during oral sex. Fifty percent (24/48) of the patients were aware of the risk of getting sexually transmitted diseases (STDs) from having oral sex without the use of a condom. The ratios of drug-resistant N. gonorrhoeae were 56.9% for Penicillin G, 0% for CVA/Amoxicillin, Azithromycin and Minocycline, 5.9% for Cefpodoxime, 2.0% for Ceftriaxone, 0% for Cefodizime, and 84.4% for Ciprofloxacin, Levofloxacin and Gatifloxacin. The bacteria in 7.8% of the cases were beta-lactamase-producing strains. The results of this study indicated that STD from oral sex is prevalent in Sapporo. Increasing resistance to Quinolone was noted, but levels of susceptibility to other drugs remained relatively high.

[Malacoplakia in the ureter and bladder].

We report a case of malacoplakia in the ureter and bladder. A 78-year-old woman was admitted to our department for detailed examination of hydronephrosis. A small-fingertip-sized tumorous yellowish white lesion was detected by cytoscopy at a site that appeared to be the right side of the ureteral orifice. Transurethral resection was performed on the same site. Flat yellowish white protruding lesions were seen at two sites on the right ureter. Michaelis-Gutmann bodies were observed in biopsy specimens from both the bladder and ureter, and a diagnosis of malacoplakia was made. Ascorbic acid and bethanechol chloride were administered postoperatively. Endoscopy performed three months after the operation showed that the protruding lesions in the bladder and ureter had disappeared. Narrowing of the ureter or vesicoureteral reflux has not been seen to date.

[Questionnaire survey on sexual behavior of Japanese males infected with sexually transmitted diseases].

In Japan, there has been a rapid increase in recent years in the incidence of sexually transmitted diseases (STD), particularly in teenagers and people in their twenties. To determine the factors causing this increase in STD, we carried out a questionnaire survey on the sexual behavior of Japanese males. The subjects were 248 male patients who were treated at our outpatient clinic. The results of the survey showed that 1) about 70% of the male patients were infected through sexual intercourse with partners who were not paid for such services; 2) the average number of partners in the past year was 5.8, and the average number of partners was highest for the teenage group and decreased with age; 3) only 29 (12.4%) of the 234 males used condoms; and 4) 192 (82.0%) of the 234 males received oral sex. The results of the survey suggest that a large "sexual network" has been formed among young Japanese people and that a large percentage of young Japanese people are engaged in unprotected sex.

[Nephrogenic adenoma of the bladder treated with cystectomy to control severe irritative symptoms: a case report].

A 68-year-old man was admitted to our hospital for treatment of a recurrent bladder tumor. Histological examination performed after transurethral resection of the bladder tumor (TUR-BT) revealed a nephrogenic adenoma without any evidence of malignancy. After TUR-BT, total cystectomy was performed to control severe irritative symptoms. Prolonged cystitis and intravesical pirarubicin therapy after TUR-BT may have played an etiological role. Our case is the 25th case of nephrogenic adenoma of the bladder reported in the Japanese literature.