The haemagglutinating activity of different anti-DNP antibody populations when dinitrophenylated sheep and human red cells are used as agglutinogen.
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Animals↗
Biomedical subjects
S Quiroga
Publications and source records attributed to S Quiroga.
Labeling of proteins with 125I and experimental determination of its specific activity.
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Follicle Stimulating Hormone↗
Physicochemical study of the electrolytic incorporation of iodine into bovine growth hormone (BGH).
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Animals↗
Spontaneous aortocaval fistula: CT findings with pathologic correlation.
We present a case of aortocaval fistula (ACF) secondary to spontaneous rupture of an atherosclerotic infrarenal aortic aneurysm into the inferior vena cava that was initially diagnosed with computed tomography (CT). This is believed to be the first report of this condition with CT demonstration of the exact site of fistula and CT-pathologic correlation. We retrospectively reviewed the CT findings of another two cases of ACF and the previous literature.
Aorta, Abdominal↗
Duodenal schwannoma causing gastrointestinal bleeding: helical CT findings.
Neurogenic tumors of the small intestine are extremely rare and represent an unusual cause of gastrointestinal hemorrhage. We present a case of schwannoma of the fourth portion of the duodenum demonstrated by helical computed tomography. Multiplanar reconstructions showed a hypervascular tumor arising from the inferior wall of the duodenum. The use of water as oral contrast agent instead of iodinated contrast permitted a better visualization of the intact mucosa and differentiated a hypervascular tumor from hypodense gastrointestinal content.
Aged↗
Small bowel obstruction secondary to bezoar: CT diagnosis.
Two cases of small bowel obstruction secondary to phytobezoar diagnosed by computed tomography (CT) and confirmed at surgery are presented. CT findings were dilated intestinal loops and an intraluminal mass with air bubbles retained in its interstices, resulting in a mottled appearance. We propose that definite diagnosis of small bowel bezoar can be made on the basis of these CT findings.
Aged↗
Arteriovenous fistula secondary to iliac mycotic aneurysm: helical CT findings.
We describe the case of a 59-year-old man who presented a mycotic aneurysm of the common right iliac artery due to Streptococcus agalactiae and developed an arteriovenous fistula within the inferior vena cava secondary to spontaneous rupture of the aneurysm. The clinical syndrome, helical computed tomographic, and angiographic findings are described and discussed.
Aneurysm, Infected↗
Aortic dissection: diagnosis and follow-up with helical CT.
Acute aortic dissection is a cardiovascular emergency that requires prompt diagnosis and treatment. Helical computed tomography (CT) allows diagnosis of acute aortic dissection with a sensitivity and specificity of nearly 100%. With helical CT, a dissection involving the ascending aorta (type A in the Stanford classification) can be differentiated from one distal to the left subclavian artery (type B). Helical CT can also be used to identify atypical forms of aortic dissection such as intramural hematoma, penetrating atherosclerotic ulcer, ruptured type B dissection, and atypical configurations of the intimal flap. Helical CT is useful in follow-up of aortic dissection by allowing assessment of early and late changes after surgery or medical treatment. Such changes include postoperative complications of type A dissection, healing of intramural hematoma, progression of intramural hematoma, and aneurysms of the true or false lumen. Helical CT can also be used to monitor potentially life-threatening ischemic complications of abdominal branch vessels.
Aortic Dissection↗
Portomesenteric vein gas: pathologic mechanisms, CT findings, and prognosis.
Portomesenteric vein gas is a rare condition whose pathogenesis is not fully understood. Portomesenteric vein gas is most commonly caused by mesenteric ischemia but may have a variety of other causes. The primary factors that favor the development of this pathologic entity are intestinal wall alterations, bowel distention, and sepsis. Portomesenteric vein gas is idiopathic in approximately 15% of cases. Advanced imaging techniques such as computed tomography (CT) have increased the sensitivity for detection of portomesenteric vein gas. At CT, portal vein gas appears as tubular areas of decreased attenuation in the liver, predominantly in the left lobe. Gas in the great mesenteric veins can easily be demonstrated with contrast material-enhanced CT, whereas gas in the small mesenteric veins appears as tubular or branched areas of decreased attenuation in the mesenteric border of the bowel. Findings of portomesenteric vein gas at CT should be carefully evaluated in the context of clinical findings. In the majority of cases, the prognosis is favorable and surgery is not required. However, when CT demonstrates portomesenteric vein gas and clinical findings suggest the presence of mesenteric ischemia, surgery is mandatory.
Diagnosis, Differential↗
Improved diagnosis of hepatic perfusion disorders: value of hepatic arterial phase imaging during helical CT.
The liver has a unique dual blood supply, which makes helical computed tomography (CT) a highly suitable technique for hepatic imaging. Helical CT allows single breath-hold scanning without motion artifacts. Because of rapid image acquisition, two-phase (hepatic arterial phase and portal venous phase) evaluation of the hepatic parenchyma is possible, improving tumor detection and tumor characterization in a single CT study. The arterial and portal venous supplies to the liver are not independent systems. There are several communications between the vessels, including transsinusoidal, transvasal, and transplexal routes. When vascular compromise occurs, there are often changes in the volume of blood flow in individual vessels and even in the direction of blood flow. These perfusion disorders can be detected with helical CT and are generally seen as an area of high attenuation on hepatic arterial phase images that returns to normal on portal venous phase images; this finding reflects increased arterial blood flow and arterioportal shunting in most cases. Familiarity with the helical CT appearances of these perfusion disorders will result in more accurate diagnosis. By recognizing these perfusion disorders, false-positive diagnosis (hypervascular tumors) or overestimation of the size of liver tumors (eg, hepatocellular carcinoma) can be avoided.
Diagnosis, Differential↗
Complications of orthotopic liver transplantation: spectrum of findings with helical CT.
Orthotopic liver transplantation has become the treatment of choice for patients with end-stage nonmalignant liver disease. The surgical techniques and immunosuppressive therapy for this procedure have improved considerably. Nevertheless, there are still significant complications, particularly those of vascular origin, which can lead to graft failure and require retransplantation unless prompt treatment is instituted. These complications include arterial and venous thrombosis and stenosis; arterial pseudoaneurysm; biliary leakage, stricture, and obstruction; liver ischemia, infarction, and abscess; fluid collections and hematomas; lymphoproliferative disorders; recurrent tumors; hepatitis C virus infection; and splenic infarction. Since the clinical presentation of posttransplantation complications is frequently nonspecific and varies widely, imaging studies are critical for early diagnosis. Helical computed tomography (CT) is a valuable complement to ultrasonography (US) in the postoperative period and is a safe, accurate, and noninvasive method of demonstrating hepatic vessels (hepatic artery, portal vein, hepatic veins, and inferior vena cava) and evaluating nonvascular complications (in the hepatic parenchyma and bile duct abnormalities) and extrahepatic tissues. Knowledge and early recognition of these complications is essential for graft salvage, and CT can provide valuable information, particularly for patients with indeterminate US results or in whom US examination is difficult.
Aneurysm, False↗
Helical CT in renal transplantation: normal findings and early and late complications.
Over a 5-year period, 346 helical computed tomographic (CT) studies were performed in renal transplant recipients. Helical CT proved useful in this context by depicting parenchymal, perirenal, renal sinus, pyeloureteral, and vascular complications in great detail. CT often delineates fluid collections and their anatomic relationship to adjacent structures better than ultrasonography (US), particularly in obese patients. CT-guided puncture and drainage can be performed in cases in which US is deemed inadequate. CT angiography can depict arterial diseases such as stenosis, thrombosis, arteriovenous fistulas, aneurysms, and pseudoaneurysms in the graft artery and in the recipient iliac arterial system, thereby obviating conventional angiography in some cases. Helical CT with three-dimensional image reformatting allows accurate imaging of the entire course of ureteral and periureteral diseases (eg, hydronephrosis, ureteral leak and stricture, pyeloureteral obstruction). CT can be used in the confirmation and staging of malignancies of the renal parenchyma and urothelium. It is also helpful in evaluating associated disease in the native kidneys, acute and chronic rejection, graft embolization, and end-stage disease. Although US and nuclear medicine examination are the imaging modalities of choice in renal transplantation, helical CT is a valuable alternative when these techniques are inconclusive.
Abscess↗
[Maternal perception of the quality of care given to their children during hospitalization].
In order to evaluate the perception of mothers on the care given to their hospitalized children, a survey was specially designed and carried out with 100 mothers on the day of their child's discharge. Hospital care was rated excellent or good by a 96%, regular or bad by 4% of surveyed mothers. Most (74%) mothers saw at least one member of the caring team acting affectionately with their children; only 2% complained that her child was reprimanded or punished. Lack of equipment or human resources and comfort facilities were frequently perceived by mothers but quality of care was generally considered to be satisfactory. This kind of studies is probably useful to improve community's health services.
Attitude of Health Personnel↗
[Use of a new steroid (Org OD 14) in the climacteric syndrome].
A double-blind study was carried out in 60 women with climacteric symptoms: 30 women were given Org OD 14 (2.5 mg) and 30 were given a placebo to be taken daily for six weeks. The effects of the medication on the climacteric symptoms, the subjective sensations, the plasma FSH levels and endometrial histology were studied. In the treated group compared with the control group the relief or improvement of the following climacteric symptoms were recorded: perspiration, palpitations, irritability and backache. A favourable effect on the subjective sensations was noted in both groups, although no significant difference for the group which received Org OD 14 was found. At the end of the treatment with Org OD 14, the FSH levels were found to be greatly reduced in comparison with the basal values; this, however, was not the case with the placebo group. With regard to endometrial histology, no sign of hyperplasia was found in any of the patients. No relevant side effects or symptoms of estrogenic or androgenic stimulation were recorded. For the climacteric patient needing estrogen therapy, it can be concluded that Org OD 14 is an effective and innocuous medication in the doses used.
Adult↗