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Biomedical subjects

D Wixson

Publications and source records attributed to D Wixson.

15 recordsLinked to original sources
PubMed1980

Childhood hypertensive stroke with neurofibromatosis.

A child with neurofibromatosis had hypertension and acute hemiplegia resulting from both renal and cerebral vascular occlusive disease. This case illustrates the importance of recognizing surgical antihypertensive therapy was attempted, and may have contributed to rapid neurologic deterioration. Children with neurofibromatosis and hypertension require a careful neurologic evaluation, including computed tomography, before therapy.

Arterial Occlusive Diseases↗
PubMed1979

Pitfalls in the plain film evaluation of the thoracic aorta: the mimicry of aneurysms and adjacent masses and the value of aortography. Part I. Transverse aortic arch.

In five instances, transverse aortic arch aneurysms were found that had initially, clinically and radiographically, mimicked thoracic neoplasms. Transverse aortic arch aneurysms display a wide spectrum of presentation: they may be asymptomatic, or they may cause symptoms secondary to esophageal, bronchial, vascular, or neural compression within the mediastinum and so mimic neoplasms. Conventional radiography in four projections and tomography are important components of the diagnostic evaluation of middle mediastinal masses. However, because plain film analysis is unable confidently to distinguish selected uncalcified aortic arch aneurysms from neoplasms, thoracic aortography is essential to the diagnosis.

Adult↗
PubMed1979

Pitfalls in the plain film evaluation of the thoracic aorta: the mimicry of aneurysms and adjacent masses and the value of aortography. Part II. Descending thoracic aorta.

Distinguishing posterior mediastinal and pulmonary masses from aneurysms and tortuosity of the descending thoracic aorta may be difficult, as five such cases illustrate. Both the neoplasms and the aortic aneurysms or tortuosity can compress the same vital mediastinal structures; thus, they may give rise to the same symptoms. Because the plain film findings may also be similar, aortography is essential to their diagnosis.

Aged↗
PubMed1979

Sonographic evaluation of the nonfunctioning kidney.

The results of B-mode ultrasound examinations in 113 consecutive patients with unilateral renal nonfunction or severe azotemia were reviewed. The causes of nonfunction included the following: hydronephrosis; renal parenchymal disease; renal agenesis; atrophy or dysplasia; multicystic, medullary cystic, and polycystic kidneys; renal arterial or venous occlusive disease; extensively infiltrating neoplasm. The sonographic findings were consistent with the final diagnosis in 92 percent of the cases. A coronal view of the kidney for diagnosing hydronephrosis is described. This view demonstrates the dilated calyces in continuity with the renal pelvis and, when combined with transverse views, improves the reliability of the sonographic diagnosis of hydronephrosis. In cases where the renal landmarks appear totally normal, obstruction can be excluded as a cause of nonfunction, and retrograde pyelography may be avoided. The sonographic manifestations of other parenchymal abnormalities associated with nonfunction, such as cystic renal disease, glomerulonephritis, and renal transplant rejection, are also discussed.

Abscess↗
PubMed1977

The incidence of congenital anomalies of the coronary arteries in the adult population.

A review of 1,000 consecutive coronary angiograms, most of them performed for evaluation of angina pectoris, yielded 9 examples of congenital anomalies of the coronary arteries. In 2 cases the angina may have been due to malposition of the left coronary artery or one of its branches. There were 2 cases of aberrant origin of the circumflex artery from the right coronary artery, 2 cases of aberrant left anterior descending artery, 3 cases in which all three major coronary branches arose from the right aortic sinus, and 2 cases of coronary artery fistulas. Malposition of the coronary artery should be considered as a possible cause of angina.

Adolescent↗
PubMed1976

Hepatomography: an experimental technique using an emulsifier.

Hepatomography was performed by injecting emulsified Ethiodol into the hepatic artery of 9 beagles. The hepatogram was dense and remained long enough for diagnostic tomography. Contrast material was eliminated in part through the kidneys and disappeared from the liver within 24 hours after injection. The dogs were sacrificed 36 hours to 4 months after contrast injection. Longlasting ill effects were observed in only one dog which died of hepatitis. The death of this prompted the use of a more dilute emulsion which was beeter tolerated by all subsequent animals.

Animals↗
PubMed1976

Displaced lateral surface of the liver (Hellmer's sign) secondary to an extraperitoneal fluid collection.

In 1942, Bellmer (1) first described visualization of a medially displaced lateral liver edge on abdominal radiographs in patients with ascites. In Hellmer's original article and all cases subsequently reported, this appearance was described as being pathognomonic of intraperitoneal fluid. This paper reports the occurrence of Hellmer's sign in a patient with a large extraperitoneal fluid collection extending into the flank. Thus the differential diagnosis associated with a medially displaced lateral liver edge includes pathologic processes in both the intra- and extraperitoneal spaces.

Aged↗
PubMedDate not supplied

Sonographic evaluation of renal masses: correlations with angiography.

The value of sonography in the diagnosis of renal masses in a series of 119 consecutive histologically confirmed cases is presented. Sonography correctly identified 92% of the cystic and 90% of the solid renal masses. Causes of incorrect diagnoses included lesions smaller than 2 cm, masses in the left upper pole, diffusely infiltrating urothelial tumors, echogenic fatty lesions (early in our experience), and acute abscesses and hematomas. Angiography in the same series of cases correctly diagnosed 80% of the cystic and 88% of the solid renal masses. Avascular lesions were the main cause for equivocal or incorrect angiographic diagnoses. We conclude that sonography is more definitive than angiography in the diagnosis of avascular masses, while angiography excels when the lesion is vascular or small. Combining the sonographic and angiographic findings allowed accurate diagnosis in over 99% of the cases.

Angiography↗
PubMedDate not supplied

Regional ejection fractions in patients with patent and thrombosed grafts after coronary artery vein bypass surgery.

Twenty-six patients who had received 43 grafts were studied before and after coronary artery vein bypass surgery. Cine ventriculograms taken in the right anterior oblique projection were analyzed and regional ejection fractions calculated. Single and multiple grafts were considered separately as were thrombosed and patent grafts. Patients were also divided into those with regional ejection fractions below 50% and those with regional ejection fractions above 50%. No statistically significant improvement of the relevant segments was demonstrated in any group. However, those with a regional ejection fraction above 50%, whose grafts had thrombosed, deteriorated from a mean of .66 to .39. There is a significant trend here (p less than .05) and a t test significance at the 7% level.

Cineangiography↗