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Akihiro Takeda

Publications and source records attributed to Akihiro Takeda.

9 recordsLinked to original sources
PubMed2006

Laparoscopic management of mature cystic teratoma of bilateral ovaries with adnexal torsion occurring in a 9-year-old premenarchal girl.

BACKGROUND: Laparoscopic surgery is a minimal-access procedure with many advantages. However, reports of young girls with adnexal disease treated by laparoscopic surgery are limited in the literature. CASE: A 9-yr-old premenarchal girl presenting with acute abdomen was treated by emergency laparoscopic surgery. Bilateral adnexal torsion was noted. After detorsion, bilateral cystectomy was successfully performed and ovarian tissues were preserved. Pathological diagnosis was mature cystic teratoma of bilateral ovaries. CONCLUSION: Although adnexal torsion occurring in a premenarchal girl is an extremely rare disorder and bilateral adnexal torsion is even more rare, gynecologists should possess sufficient knowledge about the manifestations of such disorder for immediate diagnosis and treatment to preserve future fertility and, if available, laparoscopic approach should be chosen for a young girl.

Abdomen, Acute↗
PubMed2006

Spontaneous ectopic pregnancy occurring in the isthmic portion of the remnant tube after ipsilateral adnexectomy: report of two cases.

Two cases of spontaneous ectopic pregnancy occurring in the isthmic portion of the remnant tube after previous ipsilateral adnexectomy are presented. Laparoscopic observation and postoperative histopathological examination suggested intrauterine transmigration of the fertilized egg as the etiology. Laparoscopic excision of the remnant tube was performed and the postoperative course was uneventful in both cases. Attention should be paid to this unusual type of ectopic pregnancy while examining patients with previous history of adnexal surgery.

Abdominal Pain↗
PubMed2004

Nanoflow gradient generator for capillary high-performance liquid chromatography-nanoelectrospray mass spectrometry.

A novel nanoflow gradient generator using a 10-port switching valve with two injection loops installed, which is referred to here as the "Asymptotic-Trace-10-Port-Valve" (AT10PV) nanoGR generator, has been applied to capillary high-performance liquid chromatography (HPLC)-microelectrospray (microESI) or nanoelectrospray (nanoESI) time-of-flight mass spectrometry (TOF MS). In this study, performance of this capillary HPLC-micro/nanoESI-MS system was tested at a flow rate of 200 nl/min by using three typical peptides (angiotensins I, II, and III: 50 fmol each). The result demonstrated that this system provides reasonably good repeatability of peak retention times (R. S.D. of less than 0.5%). Sequential runs of a series of sample injections were performed in the same manner as conventional analysis at microflow rates.

Chromatography, High Pressure Liquid↗
PubMed2004

Nanoflow gradient generator for capillary high-performance liquid chromatography.

A novel method of generating a nanoflow gradient elution for a capillary high-performance liquid chromatography (HPLC) system has been developed. An important feature of this system is that any gradient (GR) profile generated by a conventional microflow GR pump can be asymptotically traced and converted as a corresponding nanoflow GR profile simply by using a 10-port switching valve with two injection loops installed. Consequently, it has been called an "asymptotic trace 10-port valve" (AT10PV) nanoflow GR generator. Performance of the AT10PV nanoflow GR generator was tested in the range of flow rates from 50 to 500 nL/min. The test demonstrated that the AT10PV nanoflow GR generator can asymptotically trace the original gradient profile with good reproducibility. A capillary HPLC system using the AT10PV nanoflow GR generator provides reasonably good repeatability of peak retention times on the chromatogram of the tryptic digest of a BSA sample, RSD of less than 0.3% at a flow rate of 200 nL/min. It also enables sequential running of a series of sample injections in the same manner as conventional analysis at microflow rates.

Acetone↗
PubMed2004

Preoperative evaluation of submucosal myoma by virtual hysteroscopy.

STUDY OBJECTIVE: To assess the utility of a new technique called virtual hysteroscopy in the evaluation of the size and location of submucosal myomas before hysteroscopic myomectomy. DESIGN: Retrospective analysis (Canadian Task Force classification II-1). SETTING: Department of gynecology at a general hospital. PATIENTS: Thirteen consecutive women. INTERVENTION: Sixteen-slice computed tomography (CT) scanner. MEASUREMENTS AND MAIN RESULTS: Thirteen women with submucosal myomas were examined by virtual hysteroscopy. The lesions were filmed by multislice CT scanner, immediately after CO2 injection into the uterine cavity with an intravenous dosage of iodide contrast media. The filmed image was subsequently reconstituted and analyzed by endoscopy mode and volume mode using three-dimensional computer graphics software. The size and depth of invasion of the submucosal myoma were clearly identified by the procedure. CONCLUSION: Accurate preoperative evaluation of the size and location of submucosal myomas before hysteroscopic myomectomy is important for a safe surgical procedure. Virtual hysteroscopy can provide such information with good reproducibility and is superior to previously described diagnostic procedures.

Adult↗
PubMedDate not supplied

A case of a mature cystic teratoma of the uterosacral ligament successfully treated by laparoscopic surgery.

An asymptomatic tumor was found in the pelvic cavity of a 49-year-old woman during a routine examination. With a diagnosis of mature cystic teratoma of the right ovary, laparoscopic surgery was performed. The intraoperative finding showed the presence of a cystic tumor firmly attached to the uterosacral ligament in a position distant from the bilateral ovaries. Laparoscopic excision was performed, and the diagnosis of mature cystic teratoma of the uterosacral ligament was made histopathologically. This is the first report in the literature of successful laparoscopic treatment for a mature cystic teratoma of the uterosacral ligament.

Adnexa Uteri↗
PubMedDate not supplied

Laparoscopic surgery in 12 cases of adnexal disease occurring in girls aged 15 years or younger.

STUDY OBJECTIVE: To evaluate the treatment by laparoscopic surgery of adnexal disease occurring in young girls. DESIGN: Retrospective analysis (Canadian Task Force classification II-1). SETTING: Department of gynecology at a general hospital. PATIENTS: Twelve consecutive girls aged 15 years or younger. INTERVENTIONS: Laparoscopic surgery. MEASUREMENTS AND MAIN RESULTS: Seven patients had dermoid cysts, and three of these were associated with adnexal torsion. Two patients had ruptured lutein cysts with ovarian bleeding, and one of them was pregnant. Torsion of the tube with paraovarian cyst, torsion of normal ovary, and serous cystadenoma were noted in one patient each. Although the underlying diseases varied, the chief symptom in each of these patients was lower abdominal pain. Because the symptom is nonspecific, the clinical features were confusing, especially in emergency cases; in two patients with adnexal torsion with dermoid cysts and one patient with adnexal torsion of a normal ovary, there was substantial delay in diagnosis, and salpingo-oophorectomy was required as a result. CONCLUSION: Even in young girls, laparoscopic surgery can be performed in an acceptable manner using regular instruments designed for adults.

Abdominal Pain↗
PubMedDate not supplied

Management of patients with ectopic pregnancy with massive hemoperitoneum by laparoscopic surgery with intraoperative autologous blood transfusion.

STUDY OBJECTIVE: To evaluate the feasibility and safety of surgical laparoscopy with intraoperative autologous blood transfusion for ectopic pregnancy with massive hemoperitoneum. DESIGN: Retrospective analysis (Canadian Task Force classification II-1). SETTING: Department of gynecology at a general hospital. PATIENTS: Seventeen consecutive patients with ectopic pregnancy with massive hemoperitoneum. INTERVENTION: Laparoscopic surgery with salvage device-based intraoperative autologous blood transfusion. MEASUREMENTS AND MAIN RESULTS: From January 2000 through June 2005, one hundred and twelve women with ectopic pregnancy (interstitial/cornual: 4; isthmic: 18; ampullary: 86; and ovarian: 4) were treated by laparoscopic surgery. Seventeen patients who demonstrated more than 501 g of intraabdominal bleeding were classified as having massive hemoperitoneum and retrospectively analyzed. Site of pregnancy in these 17 patients was interstitial/cornual: 3; isthmic: 5; ampullary: 7; and ovarian: 2. Except for two women with tubal abortion of ampullary pregnancy, all other patients had rupture at the pregnancy site. During laparoscopic surgery, blood pooled in the abdominal cavity was collected by an irrigation and aspiration procedure, and sent to an autologous blood-salvage device to make concentrated red blood cell solution. Processed blood was immediately transfused back to the patient through a leukocyte reduction filter. The mean amount of estimated intraabdominal bleeding, which was calculated by the difference between the volumes of aspirated and irrigated fluids, was 1362.1 +/- 491.4 g, and the mean volume of reinfused processed blood was 680.6 +/- 209.5 g. No patient received banked blood at any time. The degree of hemoperitoneum was well correlated with the shock index calculated by dividing the heart rate by systolic blood pressure at triage (r = 0.72; 95% CI 0.37-0.89; p = .001). In all cases of massive hemoperitoneum, there was no need for laparotomic conversion, and homologous blood transfusion was avoided. CONCLUSIONS: Even in women with ectopic pregnancy with massive hemoperitoneum, laparoscopic surgery can be safely conducted by experienced laparoscopists with intraoperative autologous blood transfusion if hemodynamic stability is achieved by perioperative management.

Adolescent↗