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D Artaud

Publications and source records attributed to D Artaud.

24 records · Page 2Linked to original sources
PubMed1996

Diagnosis of pulmonary embolism with spiral CT: comparison with pulmonary angiography and scintigraphy.

PURPOSE: To evaluate the accuracy of spiral computed tomography (CT) in the noninvasive diagnosis of pulmonary embolism (PE). MATERIALS AND METHODS: A prospective study was performed in 75 patients who were evaluated with spiral CT and pulmonary angiography of each lung to detect central PE; 25 of the patients also underwent ventilation-perfusion (V-P) scanning. RESULTS: Spiral CT scans were technically suboptimal in three patients. CT and angiographic findings were negative for PE in 25 patients; one patient had false-negative CT findings. Findings from both studies were positive in 39 patients. CT findings of 188 central emboli corresponded exactly to those of angiography. Ten emboli were depicted only on CT scans, whereas seven emboli were identified only on angiograms because of inadequate depiction of the pulmonary arteries in the plane of the CT scans (n = 5) or because of misinterpretation of CT findings (n = 2). The prospective sensitivity of CT was 91%, the specificity was 78%, the positive predictive value was 100%, and the negative predictive value was 89%. Technical failures (n = 3) and inconclusive CT findings (n = 7) were the major limitations of spiral CT. Spiral CT enabled accurate classification of PE in 16 patients with indeterminate (n = 7) and low (n = 9) probability of PE on V-P scans. CT demonstrated central PE in two patients with normal V-P scans. CONCLUSION: Spiral CT can reliably depict central PE and may be introduced into the classic diagnostic algorithms.

Adult↗
PubMed1996

Helical CT angiography compared with arteriography in the detection of renal artery stenosis.

OBJECTIVE: The aim of the study was to improve the accuracy and detection rate for renal vascular lesions on helical CT angiography with an improved acquisition protocol and postprocessing. SUBJECTS AND METHODS: Fifty hypertensive patients (man age, 53 years old) referred because of clinical suspicion on renal artery stenosis were prospectively studied with digital renal arteriography and helical CT angiography. A 20-sec helical scan (collimation, 3 mm; pitch, 1) was obtained after injection of contrast medium. Interpretation was base on transverse sections, shaded-surface-display and maximum-intensity-projection reconstructions, and two-dimensional multiplanar reconstruction cuts obtained from shaded-surface-display reconstructions. RESULTS: Arteriography visualized 131 renal arteries (including 32 accessory arteries). Sixteen had significant (greater than 50% in diameter) stenosis. On helical CT angiography, 14 of these 16 stenoses were detected; two were missed (false-negatives), and two additional stenoses (false-positives) were reported. Sensitivity and specificity were 88% and 98%, respectively. Considering only main renal arteries, the sensitivity and the specificity of helical CT angiography were 100% and 98%, respectively. Helical CT angiography detected Conn's syndrome, which was responsible for hypertension, in two other patients. CONCLUSION: The accuracy and detection rate for renal artery stenosis on helical CT angiography compared with arteriography is improved with the described protocol.

Adult↗
PubMed1996

A prospective study of helical computed tomography angiography versus angiography for the detection of renal artery stenoses in hypertensive patients.

OBJECTIVE: To compare helical computed tomography angiography with arterial digital subtraction angiography in the diagnosis of renal artery stenoses. METHODS: Fifty hypertensives (24 men; mean age 53 years) were prospectively studied with computed tomography (Somaton Plus S, Siemens) and digital angiography (double-blind evaluation). Computed tomography was performed both in the sequential (the length of the abdomen) and in the helical (6 cm around renal arteries) modes during injection of 120 cm3 contrast medium. RESULTS: Digital angiography visualized 16 significant (< 50% on quantitative angiography) stenoses (16/131 renal arteries, including 32 accessory), in 14 (28%) patients. On helical computed tomography, 16 stenoses were detected, in 49 patients (16/122 renal arteries, seven accessory arteries were not identified because they were located out side the scan area); two patients had false-positive helical computed tomography results. The computed tomography sensitivity, specificity, positive and negative predictive values were 87.5% (14/16), 98.2% (111/114), 87.5% and 98.2%, respectively. In the sequential mode, two cases of bilateral adrenal hyperplasia, two aortic aneurysms and one renal neoplasm were detected. None of these patients had renal artery stenosis. CONCLUSIONS: Helical computed tomography is a suitable new non-invasive diagnostic modality for the detection of renal artery stenosis or adrenal pathology. With continued development and evaluation computed tomography could prove useful as a screening tool or as a replacement for digital angiography in patients with possible secondary hypertension.

Adolescent↗
PubMed1995

[Evaluation of spiral computed tomography of the renal arteries alone or combined with Doppler ultrasonography in the detection of renal artery stenosis. Prospective study of 114 renal arteries].

A renovascular etiology occurs in 0.2 to 2% of hypertensive patients. Recently, spiral computed tomography (CT) has evolved as a new minimally invasive tool for the diagnosis of vascular pathologic conditions. The purpose of this study was to compare both spiral CT and color Doppler ultrasonography (US) with intraarterial digital subtraction angiography (DA) in the detection of renal artery stenosis (RAS) in hypertensive patients. Between December 1993 and April 1994, 44 hypertensives (men 22, mean age 52 years) suspected secondary hypertension were prospectively studied with spiral CT (Somatom Plus S, Siemens) US (Acuson, 3.5 MHz probe) and DA (double-blind evaluation). DA visualized 11 significant (> 50%) stenoses (11/114 renal arteries, including 27 accessory). On spiral CT, 9/11 were detected and 2 additional stenoses considered false positive. On US 5 stenoses were detected whereas 11 were demonstrated by DA; 2 patients had false positive US results. [table: see text] We conclude that combined spiral CT and color Doppler ultrasonography is an effective and relatively non invasive alternative to intraarterial digital angiography for the detection of renal artery stenosis in a hypertensive population screened for renovascular hypertension.

Adolescent↗