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J P Sénac

Publications and source records attributed to J P Sénac.

At least 19 recordsLinked to original sources
PubMed2004

[Imaging of the pulmonary arteries: when, how and when?].

For several years, catheter angiography was the standard imaging technique used for evaluating the pulmonary arteries. Technical advances with computed tomography have had a significant impact on chest imaging, especially the increasing availability of multidetector row CT units. CT pulmonary angiography (CTPA) is now the first line imaging technique to evaluate pulmonary arterial diseases, including pulmonary embolus. Pulmonary angiography is now essentially limited to the endovascular management of pulmonary arteriovenous malformations, pulmonary arteriovenous fistulas or pulmonary arterial aneurysms. Gadolinium enhanced MR angiography of the pulmonary arteries may be helpful in patients with contraindications to the use of iodinated contrast material.

Aneurysm↗
PubMed2003

[Value of thoracic CT in the management of severe hemoptysis].

PURPOSE: To assess the value of thoracic CT in the management of patients with severe hemoptysis. PATIENTS AND METHODS: Between January 1997 and January 2001, 62 patients were investigated for severe hemoptysis (>300 ml/24H). The protocol, performed before angiography and embolization, included bronchial fiberoptic examination (BFE) followed by thoracic spiral CT-angiography. Data recorded at CT and BFE were the presence and location of bleeding, the etiology of hemoptysis and the therapeutic modality. RESULTS: Nine patients with life-threatening hemoptysis directly underwent bronchial embolization. CT was available in the 53 remaining patients. No abnormality was found in 4 patients. CT assessed the presence (n=49) and the location (n=38) of the bleeding. The etiology was determined in 49 patients. BFE was feasible in 38/53 patients. BFE assessed the presence (n=38) and location (n=15) of the bleeding. The etiology was determined in 12 cases of bronchial tumour. The available findings of CT and BFE for the presence and the location of the bleeding were concordant. Comparing fiberoptic examination and thoracic CT, the percentages of localized bleedings (39% and 72%) and demonstrated etiologies (32% and 92%), were significantly different (p<0,005 and p<0.0001 respectively). CONCLUSION: Although retrospective and limited by the small number of cases, our study provides arguments to perform thoracic CT before bronchial fiberoptic examination for the management of severe hemoptysis.

Adolescent↗
PubMed2001

Changes in wall mechanics after endovascular stenting in the rabbit aorta: comparison of three stent designs.

OBJECTIVE: The aim of this study was to evaluate changes in the wall mechanics of small-diameter arteries after endovascular placement of three different stents. SUBJECTS AND METHODS: Five self-expandable stents (Wallstent), five balloon-expandable noncovered Palmaz stents, and three balloon-expandable covered stents (Jostent) were placed in the infrarenal aorta of 13 New Zealand white rabbits. Systolic blood pressure changes, blood-flow velocity, systolic diameter, and diameter changes were measured and used to calculate the diameter compliance, the distensibility coefficient, and the pulsatility index. RESULTS: Compliance (10(-3) mm kPa(-1)) was 75.3 +/- 20.1 before stenting and reached 94.7 +/- 42.2 upstream, 38.8 +/- 14.2 at the stent level (p < 0.05), and 70.8 +/- 23.2 downstream from the stent. Distensibility (10(-3) kPa(-1)) was 24.3 +/- 6.3 before stenting and reached 27.8 +/- 10.3 upstream, 10.5 +/- 4.4 at the stent level (p < 0.001), and 21.9 +/- 8.6 downstream from the stent. Compliance and distensibility were significantly lower at the stent level than upstream and downstream (p < 0.05). Aortic diameter increased significantly at the stent level from 3.11 +/- 0.40 mm before to 3.76 +/- 0.42 mm after stenting. No significant difference was found among the three stent designs for all the studied data. CONCLUSION: Regardless of the three tested stent designs, endovascular stenting produces a significant decrease in arterial wall compliance of the rabbit aorta.

Animals↗
PubMed2001

[Dysfunctioning of central venous catheters: role of the radiologist].

Malfunctioning long-term central vein catheters are related to malposition, obstruction, mechanical problems and occlusion of the catheters. The diagnosis and the management of these disorders are based upon chest film examination, catheter or venous enhancement with contrast media. Vascular interventional radiology plays a major role in low invasive management of malfunctioning central vein catheters in hemodialysed patients: transfemoral malpositioned catheter manipulations, fibrin sleeve stripping, infusion of urokinase.

Catheterization, Central Venous↗
PubMed2000

[Thoracic ultrasound].

Ultrasound exploration of the thorax is a very useful imaging method in children. For adults, it is useful for pleural effusion, study of the diaphragm and to guide percutaneous puncture of targeted pleuro-parietal, mediastinal or peripheral parenchymal sites. Thoracic ultrasound remains underused, particularly as a bedside exploration technique or in emergency or intensive care situations.

Adult↗
PubMed2000

[Interventional radiology of the thorax].

Interventional radiology of the thorax includes a wide variety of diagnostic and/or therapeutic procedures. Transthoracic needle biopsy is a widely used technique. Generall, computed tomography is used to guide the puncture, less commonly fluoroscopy or in exceptional cases ultrasound. Targets include parenchymatous, pleural and mediastinal lesions. The biopsy specimen is used for cytology, histology, bacteriology, mycology and parasitology studies. Needle biopsy is also the first step in more complex procedures: drainage of thoracic collections, inserting harpoons, thoracic sympatholysis, palliative treatment of aspergillomas. Bronchial arteriography with embolization is an effective emergency symptomatic treatment for severe hemoptysis. Endovascular vaso-occlusion procedures can be used for rare arteriovenous pulmonary fistulas. Superior vena cava obstruction can be treated, usually in a palliative procedure, by installing an endovascular endoprosthesis.

Arteriovenous Fistula↗
PubMed1999

[Lateral view of the thorax: the profile].

The lateral view of the chest is a complementary incidence performed less frequently nowadays with the great frequency of chest CT. In fact, this lateral radiograph has important potential and can even give some exclusive information. With the 3-dimensional visualization provided by CT, the lateral radiograph of the chest is even easier to understand. Following in the footsteps of our great predecessors (Felson, Heitzman, Proto) we propose the left lateral view and offer our opinion about indications, techniques and results. The left lateral view can be performed with perfect perpendicular orientation or with a slight lateral shift that can be chosen with the right shoulder forwards (shifted right anterior lateral) or the contrary (shifted left anterior lateral). The left lateral view, like the antero-posterior view must be interpreted in a circular-concentric fashion.

Heart Diseases↗
PubMed1998

Diagnostic approach to mediastinal masses.

Mediastinal masses represent a vast group of tumours and pseudo-tumours which can involve the various compartments of the mediastinum. The authors propose a radiologic diagnostic approach starting from the plain thoracic radiograph with study of the mediastinal lines and oesophageal transit and going on to the classifications made possible by modern CT and MR imaging. The proposed diagnostic procedure is based on nine mediastinal lines and two 'threads of Ariadne' which are the compartments where the masses are located and their behaviour at CT (densitometry before and after administration of an iodinated bolus) and at MRI (T1, T2, gadolinium-enhanced T1-weighted sequences). The definitive aetiological diagnosis may be established by surgery, but also in certain cases by percutaneous needle biopsy.

Absorptiometry, Photon↗
PubMed1996

[Unusual spinal and pulmonary metastases].

We present the clinical and imaging findings of a 72 year old man with lytic dorsal bone lesions and a pulmonary spread of nodules (miliary) that were mistakenly attributed to a cancerous disease.

Aged↗
PubMed1992

Chest radiography and high resolution computed tomography of the lungs in asthma.

CT scans have been studied only in asthmatics who were smokers, and no such study has been performed in patients with chronic uncomplicated asthma where a permanent bronchial destruction is likely to occur after a long course of the disease. The object of the study was to characterize CT-scan abnormalities and determine whether bronchial destructive lesions may be observed. Fifty-seven adults with chronic asthma of variable severity and etiology and 10 normal subjects were studied. None of the subjects smoked. Chest radiographs and HR-CT scans were performed in all patients. To discriminate between reversible and irreversible CT-scan abnormalities, two examinations were made in 10 patients with acute asthma both before and 2 wk after parenteral high dose corticosteroid treatment. The chest radiographs showed the expected abnormalities of asthma in 37.8% of the asthmatics. CT scans were abnormal in 71.9% of the asthmatics. Reversible abnormalities included mucoid impactions, acinar pattern, and lobar collapse. Irreversible abnormalities included bronchiectasis, bronchial wall-thickening, sequellar line shadows, and emphysema. Most of these abnormalities are likely to be related to bronchial destruction.

Adult↗
PubMed1991

[An unusual miliary pattern].

Syndromes presenting with interstitial radiological signs are often difficult to diagnose aetiologically. Surgical biopsy prevents certain rare cases being neglected notably when there are atypical manifestations. We describe a case of bronchiolitis obliterans with an organising pneumonia which was classical as regards the histology and its response to treatment but unusual as regards the clinical presentation and the aetiology.

Adult↗