Biomedical subjects
Publications and source records attributed to M A Mertens.
Interventional radiology is defined as a radiologic subspecialty and the services provided are tabulated in this article; those services relevant to internists are described in greater detail. This article is intended as a survey, and the authors encourage the reader to consult the references provided for a more in-depth review.
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Quantitative intraarterial digital subtraction arteriography (DSA) was performed using a calibration catheter with three distal metallic ring markers. The two outer markers were 50 mm apart, and the third marker was in the middle. Measurements of 54 vessel diameters of the abdominal aorta, renal, lumbar, and iliac arteries were performed in a comparison study with direct film arteriograms in 10 aortofemoral runoff studies. Diameter measurements were made by both the observer on hard copy DSA images and by a computer using modified semiquantitative software. Against measurements on film, which were used as the standard, deviation in measurement on digital images varied from 8 to 13% for arterial diameters less than 5 mm and from 2 to 6% for diameters greater than or equal to 5 mm. Projectional artifacts caused 3% or less error. Knowing these variations in measurement is important in order to determine error tolerances for clinical applications. The calibration catheter serves as a convenient internal marker for DSA.
A diatrizoate compound (Renografin-76) and low osmolality Hexabrix were compared in a double-blind study of 50 adults undergoing arteriographic examination. Subjective and objective assessment of pain reaction for each contrast injection rated lower overall for Hexabrix. Discomfort associated with Renografin was greatest for injections into extremity arteries. Hexabrix showed the least change in serum osmolality. No impairment of renal function was evidenced with either contrast media. No difference in the angiographic quality of the control agents was noted.