Biomedical subjects

J Riera-Knorrenschild

Publications and source records attributed to J Riera-Knorrenschild.

5 recordsLinked to original sources

PubMed2002

Pictorial review: Colour Doppler ultrasound flow patterns in the portal venous system.

Doppler ultrasound is a well established method for assessment of the portal venous system to detect the direction of portal blood flow. It is helpful for non-invasive diagnosis of intra-abdominal portosystemic shunts, especially in patients with cirrhosis. Less attention has been paid to other influences on portal venous flow, e.g. tricuspid regurgitation, increased hepatic out-flow resistance, respiratory cycle. The aim of this pictorial review is to describe the spectrum of physiological and pathological Doppler ultrasound flow patterns in the portal venous system.

Adult↗

PubMed2001

Partially reversed intrasplenic venous blood flow detected by color Doppler sonography in two patients with hematologic diseases and splenomegaly.

We report on 2 patients with hematologic diseases (1 follicular lymphoma and 1 myeloproliferative syndrome) and splenomegaly who had partial intrasplenic portosystemic shunting demonstrated by color Doppler sonography. Intrasplenic venous blood flow was in the normal direction at the hilum of the spleen but in a reversed direction at the periphery of the spleen. This type of reversed intrasplenic flow pattern results in portosystemic shunting and might be detected more frequently when careful color Doppler mapping of the entire splenic parenchyma is performed in patients with portal hypertension. The clinical significance of this phenomenon, however, is still unclear.

Female↗

PubMed2001

[Functional hyposplenia after allogenic bone marrow transplantation: a case report].

Functional hyposplenia/asplenia is a severe longterm complication after allogeneic stemcell transplantation predominantly seen in patients who suffer from extensive chronic graft versus host disease (cGvHD). The risk of acquiring an overwhelming infection with encapsulated bacteria is ca. four fold increased in patients with functional hyposplenia/asplenia. Therefore follow up of patients who have received allogeneic blood stem cells (bone marrow or peripheral blood stem cells) should embrace screening for functional hyposplenia. When functional hyposplenia is diagnosed triple vaccination against streptococcus pneumonia, Haemophilus influenza type B and Meningococcus neisseria should be considered. Goldstandard in diagnosing functional hyposplenia is hepatosplenic scintigraphy. We present the case of 37 year old female in whom sonography was indicative of functional hyposplenia. The diagnosis was confirmed by scintigraphy. Sonography including color coded duplex sonography is a safe and cost saving procedure. Sensitivity, Specificity and predictive value of the following sonographic finding: a) decreasing splenic size and b) diminished or absent parenchymal blood flow are currently evaluated in a prospective study.

Adult↗

PubMed2000

[Focal echogenic splenic involvement in malignant lymphoma: a diagnostic problem].

AIM: The aim of our study was to describe clinical data, frequency of the findings, sonographic patterns, confirmation of diagnosis, and differential diagnosis of focal echorich splenic lymphoma involvement. PATIENTS: During the last 20 years a focal splenic lesion was found in 178 patients with malignant lymphoma. Echorich splenic lesions were seen in 11 out of 178 cases (6.2%). METHODS: Splenic size, echomorphology of lesions, size and number of lesions, and presentation during sonographic follow-up examination were presented. RESULTS: Echorich infiltrates of the spleen were predominantly seen in patients with low grade Non-Hodgkin-Lymphoma (9 out of 11), the size of lesions mostly was less than 3 cm in diameter (9 out of 11), the underlying splenic size was over 8 x 20 cm in 9 out of 11 patients. Diagnosis was confirmed by sonographic follow-up (n = 11) and autopsy (n = 1). CONCLUSION: Echorich splenic lymphoma involvement is a rare event and is characterised by a variable presentation during follow-up. Up to date the clinic significance of our observation is still unclear.

Aged↗

PubMedDate not supplied

Doppler sonographic diagnosis of respiration-dependent reversed flow in the hilar splenic vein.

We describe respiration-dependent reversed flow in the splenic vein detected by color Doppler sonography in 2 patients. In case 1, gray-scale sonography in a patient with liver cirrhosis and abdominal pain showed a hyperechoic, thickened colonic segment and diverticula, with increased echogenicity around the diseased colon. The liver was small, with a nodular surface and coarse echotexture. Doppler sonography of the portal and splenic veins showed a constant hepatopetal flow while the patient held her breath in midinspiration and a brief, transient color change restricted to the hilar splenic veins when the patient took a deep breath. In case 2, abdominal sonography in a patient with pneumonia and right-sided abdominal pain showed mural thickening of the appendix and left-sided pneumonic infiltration. The liver size and texture were normal. Color Doppler sonography of the portal and splenic veins showed a constant hepatopetal flow while the patient held his breath in midinspiration and a transient reversal of flow restricted to the splenic veins when the patient took a deep breath. Although the cause of this flow pattern is unclear, increased intra-abdominal pressure is a possible explanation.

Aged↗