Search PubMed⌕ Search

Biomedical subjects

H Murayama

Publications and source records attributed to H Murayama.

At least 145 records · Page 8Linked to original sources
PubMed1989

[A case of tetralogy of Fallot with pulmonary aneurysm].

A case of pulmonary artery aneurysm associated with tetralogy of Fallot is presented. A 28-year-old man was admitted for evaluation of cyanosis and cardiac murmur. Preoperative angiography revealed tetralogy of Fallot and an aneurysm of the main pulmonary artery aneurysm. Operation consisted of pulmonary artery aneurysmectomy and total correction of the tetralogy of Fallot. Microscopic examination of the resected aneurysm showed the thickening of intima and fragmented elastic fibers of media. A brief review of the literature emphasizes the necessity of the surgical intervention.

Adult↗
PubMed1989

[Clinical study of limited operation of lung cancer with reference to the operative procedure].

From 1977 to 1987, 27 cases of primary lung cancer were resected by the limited operation, 7 segmentectomy and 20 wedge resection. All cases of segmentectomy were considered to be potentially curative and 2 cases of them were X-ray negative early squamous cell carcinoma originated from the subsegmental bronchus. The mean tumor size of the other 5 peripheral cases performed segmentectomy was 37.6 mm in diameter. Two cases of segmentectomy died from cancer recurrence, but 2 cases are still alive more than 4.5 years after operation. All cases of wedge resection were originated peripherally, and 6 cases were thought to be potentially curative and the mean tumor size was 22.4 mm in diameter. Three cases of them died, 1 from the tumor metastasis and 2 from the other diseases than lung cancer, but the other cases undergone potentially curative wedge resection are alive without recurrence 1-3.6 years after operation. The limited operation should be indicated for the peripheral lung cancer without lymph node metastasis in the patients with marked cardiac and/or pulmonary impairment. The small nodule located in subpleural lung can be resected easily by the wedge resection, but the segmentectomy should be recommended for the tumor which is larger in size or located more deeply under the visceral pleura. Especially X-ray negative early squamous cell carcinoma of the bronchus can be curatively resected by the segmentectomy with lymph node dissection, if the tumor exists in the level of subsegmental bronchus or more peripherally. Palliative minimal resection for the advanced lung cancer seemed to be not effective of their long-surviving.

Aged↗
PubMed1988

Conformation of antithrombin III with defective biological functions derived from a thrombophilic patient.

Antithrombin III (AT III) with defective biological functions and altered antigenicity has been found in a thrombophilic patient. Circular dichroism (CD) spectra of antithrombin III purified from the patient's plasma were measured in near and far-ultraviolet (UV) wavelength regions. The far-UV CD spectrum of the patient's AT III was similar at room temperature to that of normal AT III derived from healthy adult males. Mean residue ellipticity at 221 nm of the patient's AT III, however, decreased its magnitude by 6% gradually as temperature increased up to 74 degrees C, whereas that of the normal AT III reduced its magnitude sharply at around 63-64 degrees C and by 18%. The near-UV CD spectrum of patient's AT III was different from that of normal AT III. These results indicate that the secondary structure of patient's AT III is similar to that of normal AT III at room temperature, while local conformation of aromatic amino acid residues in the abnormal protein is different from that in the normal one and that the secondary structure of the patient's AT III is heat-stable, while that of the normal one is heat-labile.

Antithrombin III↗
PubMed1988

Preparation and characterization of monoclonal antibodies against the human thrombin-antithrombin III complex.

Monoclonal antibodies were raised against human thrombin-antithrombin III complex by a hybridoma technique. Among them, five monoclonal antibodies, designated as JITAT-4, -14, -16, -17 and -19, were found to react with thrombin-antithrombin III, but not with its nascent components, alpha-thrombin or antithrombin III. Their respective immunoglobulin classes are IgG1 for JITAT-16 and -19, and IgG2a for JITAT-4, -14 and -17. Besides the thrombin-antithrombin III complex, they all bound to the Factor Xa-antithrombin III complex and the active-site-cleaved two-chain antithrombin III as well. Moreover, the reactivity of these two antibodies to the neoantigens was not affected by heparin, suggesting that their epitopes are independent of heparin-induced conformational changes of antithrombin III. Two of them, JITAT-16 and -17, were categorized as high-affinity antibodies to thrombin-antithrombin III complex, the dissociation constants being 6.7 nM and 4.8 nM, respectively. However, they do not share antigenic determinants. These monoclonal antibodies may allow us to explore more precisely the reaction between antithrombin III and thrombin or its related enzymes.

Antibodies, Monoclonal↗
PubMed1988

Gastrointestinal involvement of dialysis-related amyloidosis.

Beta-2 microglobulin-related amyloids were found in gastric biopsy specimens from 3 of 11 patients who had been on hemodialysis more than 10 years and examined. The deposits were found not only in arteriolar walls but also in lamina propria and muscle tissue. In another patient who was on hemodialysis for 8 years, beta 2-microglobulin-related amyloids were found in the muscle layer of operatively resected colon. These four patients also had the same substance deposited in the osteoarticular system. The results suggest the systemic involvement of beta 2-microglobulin-related amyloidosis in patients on long-term hemodialysis.

Amyloid↗
PubMed1988

[A minute, solitary carcinoid of the stomach with a lymph node metastasis--a case report].

The patient, a 25-year-old woman, complained of epigastralgia. Her physical examination and routine laboratory data were unremarkable, though an upper G-I series and a gastro-endoscopy demonstrated a small sessile polypoid lesion at the posterior wall of the gastric body. An endoscopic biopsy specimen taken from the polyp revealed a typical carcinoid tumor. The patient underwent a wedge resection of the stomach and a sampling was taken of the regional lymph node around the left gastric vessels. Histologically, although the carcinoid tumor was 5 mm in diameter and limited to within the submucosal layer, it showed lymphatic and venous invasion into the submucosal layer and had metastasized to one of the regional lymph nodes around the left gastric vessels. Therefore, a total gastrectomy with an extended lymph node dissection was performed and no other metastatic lesion was uncovered. Of the reported cases with a gastric carcinoid thus far, none with a tumor size of less than 5 mm has evidenced metastasis. This case suggests that even cases of a minute gastric carcinoid should be treated by radical gastrectomy and extended lymph node dissection.

Adult↗
PubMed1988

[A case of small squamous cell carcinoma with a grading of IIa + IIc, an early gastric cancer type].

A case of a 78-year old woman, complaining of epigastralgia, is reported. A series of gastrointestinal examinations revealed a small, elevated lesion with a central depression in the antrum. Since a fiberoptic biopsy had shown a Group V classification, a partial gastrectomy was performed. Tumor nodules, judged to be metastatic, were noticed in the liver and regional lymph nodes. Histologic scrutiny disclosed a keratinizing tumor that measured 1.0 X 0.9 cm in diameter and was largely a squamous cell carcinoma with a small focus indicating an adenocarcinoma. This tumor was confined to the muco-submucosal layers with prominent vascular permeation. No adenocarcinomatous components were found in the metastatic foci. The patient died eight months after operation. In light of our experience, together with what has been found in a review of the literature, we feel that a squamous carcinoma and an adenosquamous carcinoma of the stomach to be more aggressive than an ordinary adenocarcinoma and keeping this point in mind, they should be considered differentiated from an adenoacanthoma.

Adenocarcinoma↗
PubMed1986

Abnormal properties and behaviors of antithrombin III found in a thrombophilic patient: defective biological functions and dissimilar antigenic determinants.

Abnormal properties of antithrombin III have been found in a 55-year-old male who has been thrombophilic over the last seven years. They are characterized by defective inhibition of thrombin and activated blood coagulation factor X, reduced affinity to heparin and partial immunological identity with the normal molecule. The antithrombin III molecule, however, preserves a single-chain structure and an apparently identical molecular weight with that of the normal molecule. It is, thus, very unlikely that the impaired functions of antithrombin III in the patient's plasma are induced by possible proteolytic modifications of the molecule by thrombin or other related activated blood coagulation factors. Since no other members of his immediate family have been found to be affected, the abnormality may be acquired rather than genetically determined, although further investigation is necessary for the elucidation of the abnormality of the molecule.

Antithrombin III↗