AJR. American journal of roentgenology
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Nosocomial (i.e., originating or taking place in a hospital) pneumonia is the leading cause of death from acquired nosocomial infections. The estimated prevalence of nosocomial pneumonia in intensive care units ranges from 10% to 65%, with fatality rates of 13-55%. ⋯ Recent investigations have provided new insights into the pathogenesis of VAP, and improved techniques have been developed for its diagnosis. Most important, emerging clinical data now suggest that new management strategies for VAP, including more specific indications for antimicrobial use, may significantly improve patients' outcomes.
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AJR Am J Roentgenol · Nov 1994
Maturational changes in arterial impedance of the normal testis in boys: Doppler sonographic study.
The use of color Doppler sonography to diagnose scrotal disorders in children has been hampered by the small size of the vessels and the slow blood flow compared with those in adults. Spectral analysis is the best means available of confirming the vascular origin of questionable color-flow signals arising from testes of small volume. The range of normal and abnormal Doppler sonographic arterial waveforms arising from the testis in boys, as distinct from those in adults, has never been described. The purpose of our study was to establish the normal range of testicular arterial impedance, measured as resistive index (RI), in both prepubertal and pubertal/post pubertal boys. ⋯ Mean testicular RI in our samples of pubertal and postpubertal boys is decreased compared with the mean RI in prepubertal boys. Diastolic arterial flow may not be detectable in normal testes with volumes of 4 cm3 or less. Despite the existence of a statistically significant difference in mean RI between prepubertal and pubertal/postpubertal testes, substantial variability exists within each group, particularly among the prepubertal testes. Norms of testicular flow previously established for adults are therefore not routinely applicable to prepubertal boys with testicular volumes less than 4 cm3. However, RI values in normal pubertal and postpubertal boys where testicular volumes exceed 4 cm3 are comparable to those previously described in adults.
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AJR Am J Roentgenol · Nov 1994
Comparative StudyMR imaging of peritoneal disease: comparison of contrast-enhanced fast multiplanar spoiled gradient-recalled and spin-echo imaging.
We performed this study to compare contrast-enhanced fast multiplanar spoiled gradient-recalled (SPGR) MR imaging with unenhanced spin-echo imaging for the detection of benign and malignant peritoneal abnormalities. ⋯ Detection of peritoneal abnormalities with MR imaging can be improved by using contrast-enhanced fast multiplanar SPGR imaging. The findings of peritoneal thickening and enhancement are best depicted on delayed images.
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AJR Am J Roentgenol · Oct 1994
Financial support for research in radiology: a survey of original investigations published in the AJR and Radiology.
This study was done to determine how often the original research published in AJR and Radiology is formally funded by external sources of explicit intramural institutional research grants and to explore the association of financial support with the subspecialty field; type of research (clinical vs basic); number of coauthors; number of departments, nonradiology departments, and institutions participating per paper; country of origin; and citation impact of investigations. ⋯ Only a small percentage of radiology research attracts formal, especially extramural, financial support. This should be a cause for concern. As the informal funding of investigations from redirected clinical revenues is diminishing, action will be required to procure funds to support the radiology research necessary for the vitality of the specialty.