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Biomedical subjects

F Moriyasu

Publications and source records attributed to F Moriyasu.

At least 91 records · Page 5Linked to original sources
PubMed1988

A case of liver cirrhosis with large portacaval shunt from the superior mesenteric vein: normalization of reversed portal blood flow with medical treatment.

A case of liver cirrhosis with large portacaval shunt from the superior mesenteric vein is reported. The portal blood flow was diagnosed as reversed on admission, but normalized with treatment. Blood flow was measured noninvasively and repeatedly using an ultrasonic Doppler duplex system. The reversed portal flow led to the superior mesenteric vein, right (and some left) internal inguinal vein, and inferior vena cava. This rare collateral pathway was clearly demonstrated by percutaneous transhepatic portalgraphy. A link between shunt and an appendectomy carried out 22 yr ago is considered, and the possibility of the temporarily reversed portal blood flow on admission being due to deteriorated hepatic hemodynamic conditions is discussed.

Humans↗
PubMed1987

Ultrasonic Doppler duplex study of hemodynamic changes from portosystemic shunt operation.

The portal hemodynamics were studied in ten patients with portal hypertension, including three patients who had interposition mesocaval shunt (IMCS), three patients who had distal splenorenal shunt (DSRS), one patient who had gastrocaval shunt (GCS), and three patients who had splenectomy. Portal blood flow was measured by an ultrasonic Doppler duplex system, and portal venous pressure was measured by portal catheterization before, during, and after operation. The portal blood flow, and especially the splenic venous blood flow, was less during operation than before operation. Blood flow through the IMCS was greater than that through the DSRS, and the shunt flow had a tendency to increase after operation. The portal venous pressure measured during operation was slightly higher than that measured percutaneously before operation. In the patients who had the shunt operation, the portal venous pressure tended to decrease after operation. Study of portal hemodynamics, especially with the ultrasonic Doppler method, is useful in analysis and follow-up of patients who have shunt operations since the same method can be used before, during, and after operation.

Adult↗
PubMed1987

Hemodynamic analysis of postsplenectomy portal thrombosis using ultrasonic Doppler duplex system.

Using an ultrasonic Doppler duplex system, we investigated the portal hemodynamics of two patients with portal thrombosis after splenectomy and esophageal transection for portal hypertension accompanied by liver cirrhosis. In both cases, the preoperative blood flow volumes of the splenic and portal veins were especially high, but were markedly lower--even than normal--after the operation. However, the results of pre- and postoperative peripheral platelet counts and coagulation function tests did not differ remarkably. The dramatic change in portal hemodynamics caused by the splenectomy was thought to be the main factor in the formation of the portal thrombi.

Follow-Up Studies↗
PubMed1987

Central signals of gallstones in magnetic resonance imaging.

The magnetic resonance imaging of gallstones was studied in 34 patients. Diagnosis of the gallstones using magnetic resonance imaging was possible in 29 patients (85%). The gallstones showed as no-signal areas in all cases, with relatively strong signals being detected from the center of the stones in six cases. Postoperative studies showed the stones with the central signals to be of the so-called mixed stone type, in which the central area consists of cholesterol with a radiating structure. The central signal was thought to originate in water that accumulates in the central cavity of the stone, the cavity not being isolated from the exterior of the stone and there being a passage of fluids. The central signal is a characteristic indication of the stone's structure.

Cholelithiasis↗
PubMed1986

Clinical application of an ultrasonic duplex system in the quantitative measurement of portal blood flow.

The ultrasonic duplex system, which is composed of a pulsed Doppler flowmeter and a linear array B-mode scanner, was developed for the purpose of quantitative transcutaneous measurement of blood flow. It was applied here to the study of portal blood flow in a normal series with healthy volunteers as subjects. A preliminary experiment, prepared by setting up a simulation model for blood circulation, demonstrated an excellent correlation between values obtained with the electromagnetic flowmeter (EMF) and the combined ultrasonic B-mode and Doppler system (duplex system). This was confirmed in vivo in a study of blood flow in the canine vena cava. The portal blood flow in 88 healthy adult volunteers ranging in age from 18 to 55 years (average 34.3) was studied using this equipment. Blood flow in fasting subjects who were resting was 889 +/- 284 ml/min (mean +/- SD) or 16.3 +/- 5.0 ml/min/kg body weight (mean +/- SD).

Adolescent↗
PubMed1986

Spontaneous rupture of the spleen and liver in amyloidosis--a case report and review of the literature.

A 52 year-old woman with systemic amyloidosis complicated with multiple myeloma died suddenly of intraperitoneal hemorrhage due to spontaneous rupture of the spleen and liver. Autopsy revealed multiple myeloma involving the bone marrow and diffuse amyloidosis involving the liver, spleen, kidneys, heart, bone marrow, lymph nodes, lungs, gastrointestinal tract, thyroid, skin and adrenal glands. The splenic red pulp and the hepatic parenchyma were replaced by masses of amyloid. Amyloid deposits were also numerous in the walls of blood vessels and linearly in the intracapsular regions of both the liver and spleen. This is the eighth case of spontaneous rupture of the spleen and the second case of spontaneous rupture of the liver in association with systemic amyloidosis.

Amyloidosis↗
PubMed1986

Hemodynamics of splenic artery aneurysm.

Blood flow volume of the portal venous system of 3 patients with splenic artery aneurysm, an uncommon disease, was measured using an ultrasonic duplex system. A huge increase in splenic blood flow volume was found in each case. A large portasystemic shunt through which the portal blood flowed hepatofugally was present in 2 cases. We suspect the shunt is partially responsible for an increase in splenic blood flow volume, which would lead to the formation of splenic artery aneurysm together with portal hypertension.

Adult↗