Biomedical subjects
M L Gavant
Publications and source records attributed to M L Gavant.
Stabilization of biliary drainage catheters.
Accidental pulling-out of internal biliary catheters can still occur despite adequate fixation at the skin. We have combined the non-suture method with catheter molding in an attempt to prevent dislodgement of the catheter.
The "peel away" sheath in drainage procedures.
Traversing various tissues during drainage procedures may be difficult because of inadequate track development. We have successfully used the peel-away sheath, previously described in conjunction with vascular procedures, to facilitate the placement of larger, softer, and more pliable catheters through resistant parenchyma.
Radionuclide blood pool imaging of calvarial hemangioma.
A patient with new onset seizures was found to have radiographic findings of a calvarial hemangioma. Because of the history, additional diagnostic tests were employed, which excluded cerebral lesions. Findings characteristic of hemangioma on blood pool imaging were felt to confirm the diagnosis.
Delayed rupture of renal pseudoaneurysm: complication of percutaneous nephrostomy.
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Ultrasonic evaluation of gun shot injury to testicle.
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Initial experience with a universal-length copolymer ureteral stent.
A universal-length ureteral stent made of a biocompatible copolymer was designed specifically for easy antegrade internal placement. The double-looped distal end of the stent eliminates the need to measure the distance from the ureteropelvic to ureterovesical junction. If additional length is required, a portion of the distal loop is incorporated into the stent shaft. Interventional radiology practices benefit economically, as the universal-length stent is the only size required for the treatment of most ureteral obstructions.
Bronchial arteriography and embolotherapy for hemoptysis in patients with cystic fibrosis.
Bronchial arteriography and embolotherapy were performed to control hemoptysis in 11 patients with advanced stages of cystic fibrosis. Two patients suffered massive, 1 moderate, and 8 mild but recurrent hemoptysis. The embolization procedures were performed with Gelfoam, Ivalon, and coils in one to four separate procedures. Altogether, 19 of 20 procedures were successful, with follow-up periods ranging from 9 months to 8 years. No serious complications were encountered except for one femoral artery pseudoaneurysm which required surgical repair. Rapid digital subtraction angiography and "roadmapping" were considered helpful in avoiding the complication of reflux embolization and expediting the procedures. Bronchial embolization is a life-saving procedure for severe hemoptysis in patients with cystic fibrosis and is considered safe enough to include the indications of moderate and mild/recurrent hemoptysis to improve the quality of life in these patients.
Distention arthrography in the treatment of adhesive capsulitis of the shoulder.
PURPOSE: Adhesive capsulitis involving the glenohumeral joint (frozen shoulder) is an insidious and painful condition that results in gradual loss of joint motion. Recovery is frequently prolonged despite multiple therapeutic maneuvers. The authors investigate the mechanism of action and the long-term clinical result of distention arthrography for the treatment of patients with frozen shoulder. PATIENTS AND METHODS: Sixteen patients with adhesive capsulitis of the shoulder were treated with therapeutic capsular distention by using intra-articular injection of a 30-mL mixture of lidocaine, corticosteroid, and contrast media immediately following diagnostic arthrography. RESULTS: Capsular disruption was demonstrated in all cases. Thirteen patients (80%) experienced immediate pain relief and increased shoulder mobility. This improvement was maintained over a follow-up interval of 6 months or more. Disruption occurred at the subscapular bursa in eight patients, the subacromial bursa in six, and the distal bicipital tendon sheath in two. These latter two patients had no pain relief. CONCLUSION: Arthrographic distention of the constricted capsule appears to be an excellent therapeutic intervention for achieving rapid symptomatic relief from adhesive capsulitis.
Pulmonary CT findings in Behçet disease.
A 32-year-old man with Behçet syndrome presented with hemoptysis and abnormal chest radiography. A 3 cm opacity was present in the apical posterior segment of the left upper lobe and the hila were enlarged with lobulated contours. Computed tomography revealed bilateral pulmonary artery aneurysms, a complication of Behçet syndrome. Computed tomography is recommended for the evaluation of patients with Behçet syndrome who have abnormal chest radiography.
Intrarenal rupture of the abdominal aorta: CT features.
Computed tomography in patients with a ruptured abdominal aortic aneurysm usually demonstrates the aneurysm with blood in the posterior para- and perirenal spaces. Hemorrhage into the adjacent perirenal space occurs because the aorta, via the renal vascular pedicle, is in continuum with this compartment. The kidney is commonly displaced but not compromised functionally. We report a case of an asymptomatic chronic intrarenal rupture of a focal aortic aneurysm that presented as a mass in a nonfunctioning kidney.
"Incomplete ring" sign: a simple method for CT detection of spondylolysis.
Multiple authors have pointed out the difficulty of detecting spondylolysis with lumbar CT. A simple method to detect spondylolysis on lumbar CT is described. Identifying one intact cortical ring for each vertebra absolutely excludes the diagnosis obviating the time-consuming need to search each image looking for positive evidence of the abnormality. If at least one intact cortical ring for each vertebra is not found, a defect in the ring at the appropriate position assures the diagnosis.