Preoperative Nyhus classification of inguinal hernias and type-related individual hernia repair. A case for diagnostic laparoscopy.

The goal of this prospective study was to determine the clinical value (sensitivity and specificity) of preoperative hernia classification (Nyhus classification) using three distinct methods: clinical examination, Doppler ultrasonography, and diagnostic laparoscopy. Thirty patients with 35 suspected groin hernias were included. Definitive hernia classification was achieved by laparoscopic peritoneal incision and dissection of the inguinal floor.

Effect of ethanol and fructose on liver metabolism: a dynamic 31Phosphorus magnetic resonance spectroscopy study in normal volunteers.

In vivo 31Phosphorus magnetic resonance spectroscopy (31P-MRS) permits evaluation of dynamic changes of individual phosphorus-containing metabolites in the liver parenchyma, such as phosphomonoester (PME), adenosine triphosphate, and inorganic phosphate (Pi). Intravenous fructose load alters phosphorus metabolites and allows assessment of liver function by 31P-MRS. 31P-MRS data obtained in alcoholic liver disease are however inconclusive.

Long-term results of arthroscopic meniscal repair. An analysis of isolated tears.

From 1984 through 1986 we performed 54 arthroscopic meniscal repairs on patients with anterior cruciate ligament-stable knees. We evaluated the repair results of 52 of these patients at an average followup of 7.5 years.

Simultaneous temporal resolution of cardiac and respiratory motion in MR imaging.

Purpose: To evaluate a magnetic resonance (MR) imaging method that allows for simultaneous resolution of both the cardiac and respiratory cycles.

Materials And Methods: Conventional and phase-contrast cine sequences were modified to provide additional resolution of the respiratory cycle. Data were collected in 11 healthy volunteers during MR imaging of the heart and portal vein.

Renal artery blood flow: quantitation with phase-contrast MR imaging with and without breath holding.

Purpose: To compare the accuracy of 16-frame cine phase-contrast (PC) magnetic resonance (MR) imaging with those of two breath-hold PC techniques in the measurement of renal artery blood flow.

Materials And Methods: In vitro flow measurements were performed in a segment of harvested human artery embedded in gel. For the cine PC acquisition, respiratory motion was simulated.

[MR angiography of the abdomen].

The two techniques currently most often used for MR angiography, those based on time-of-flight effects and on phase-contrast, are introduced, and our results with three-dimensional phase contrast angiography of the abdomen are presented. Several basic differences from other imaging procedures render MR angiography clinically useful for screening for renal artery stenosis in critical situations, such as renal failure or intolerance to contrast agents. In the future, the spectrum of applications of MR angiography will broaden and include other indications, such as portal venous hypertension and follow-up studies after surgical portal systemic shunting.

Morphological and haemodynamic aspects of cerebral aneurysms.

4 patients with aneurysms of different size and location were examined by cerebral angiography, computed tomography, angio-computed tomography, magnetic resonance imaging and angiography, in order to demonstrate haemodynamic and morphological aspects of cerebral aneurysms. Turbulent flow within aneurysms could be shown by cerebral angiography and magnetic resonance angiography. In contrast MRI or computed tomography are necessary to visualize additional thrombosed parts.

Comparison of magnetic resonance angiography, magnetic resonance imaging and conventional angiography in cerebral arteriovenous malformation.

10 patients with an AVM of the brain were examined by magnetic resonance angiography (MRA), magnetic resonance imaging (MRI) and conventional cerebral angiography (CCA). From MRA in 7/10 patients important information about vascular supply could be provided; in 3 patients, all with small AVM's it could be only suspected. CCA revealed the vascularisation of the AVM's in all patients and showed additional hemodynamic aspects better than MRA.

Magnetic resonance angiography of abdominal vessels: early experience using the three-dimensional phase-contrast technique.

Based on three-dimensional acquisition of three sequences sensitive to one flow-direction, abdominal magnetic resonance phase-contrast angiography (MRA) was performed in 13 volunteers and 20 patients. The subjects received no antiperistaltic medication and were allowed to breath normally during the three acquisition periods of 11 minutes. The frequency of demonstration of the normal aorta, superior mesenteric and right and left renal arteries was 100%/100%/91%/100%, and of the inferior vena cava, splenic, superior mesenteric and portal veins was 92%/67%/92%/100%, respectively, whereas other abdominal vessels were seen less constantly.

Neuro-Behçet: acute and sequential aspects by MRI and MRS.

Three patients with neuro-Behçet underwent MRI and MRS during acute illness. After therapy, MRI and MRS were performed in 3 and 1 patients, respectively. MRI revealed a marked improvement of the initial lesion in 2, a complete remission in 1 patient.

Two- and three-dimensional phase contrast MR angiography of the abdomen.

Protocols for two- and three-dimensional phase contrast magnetic resonance angiography of the major vessels in the abdomen were developed and demonstrated in healthy volunteers. Phase contrast imaging provides excellent suppression of stationary tissue signal and can be used to quantify the speed and direction of flow in a given vessel. The two-dimensional protocols provide rapid breath-held images, which proved useful for anatomical localization.