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Biomedical subjects

F C Taylor

Publications and source records attributed to F C Taylor.

47 records · Page 3Linked to original sources
PubMed1991

Incomplete opening of LGM (Vena Tech) filters inserted via the transjugular approach.

Over a 12-month period, 216 LGM vena caval filters were placed in 216 patients at four institutions. The transjugular approach was used in 31 of 216 insertions (14%); 185 of 216 filters (86%) were inserted via the femoral route. Incomplete opening of filters was encountered in 13 of 31 transjugular insertions (41%) and none of 185 transfemoral insertions. Delayed spontaneous filter opening occurred in three of 12 cases (25%) of incomplete opening (in which follow-up was available) at 5 minutes, 4 days, and 2 months after insertion. One filter opened completely after catheter manipulations. Several mechanisms explaining this complication are proposed. In its present form, the LGM filter should not be inserted via the jugular route. Since the filtering capabilities of the incompletely opened LGM device have been shown to be diminished in vitro, it may be advisable to place a second filter cephalad to an incompletely opened LGM filter.

Equipment Failure↗
PubMed1991

Use of the Bird's Nest filter in oversized inferior venae cavae.

An inferior vena cava (IVC) diameter of greater than 28 mm has been considered a contraindication to the intracaval placement of Greenfield, LG-Medical (LGM), and Simon nitinol filters, necessitating biiliac placement of these devices. With the Bird's Nest filter (BNF), the maximum span of the struts, which immobilize the device, is 60 mm; this allows the placement of the BNF in an oversized IVC having a diameter of greater than 28 mm. Over a 44-month period, 799 IVC filters (547 BNF, 136 Greenfield filters, and 116 LGM filters) were inserted. BNFs were placed in 18 patients (2.3%) with an oversized IVC (diameter range, 29-42 mm); all filters were placed via the femoral route. Patient records were reviewed to determine if problems were associated with filter insertion (including insertion site femoral vein thrombosis) and to determine the prevalence of filter migration, caval thrombosis, and new or recurrent pulmonary emboli (PE) after insertion. No difficulties were encountered during insertion. There was no documented case of device migration, caval thrombosis, or clinically apparent new or recurrent PE. The data suggest that the BNF is the filtering device of choice in patients with an oversized IVC.

Adult↗
PubMed1989

Late presentation of splenic trauma after routine colonoscopy.

Splenic trauma is a rare complication of colonoscopy and is often not readily diagnosed. A computerized tomographic scan enabled us to diagnose splenic trauma without hematoperitoneum in a patient presenting with abdominal and left shoulder pain 10 days post-colonoscopy. The scan information and the patient's clinical status allowed for nonoperative treatment of the injury.

Colonoscopy↗
PubMedDate not supplied

Left femoral vein approach for the percutaneous placement of the Bird's Nest Filter.

The Bird's Nest Filter femoral catheter set has proven to be too short in some patients to permit placement in close proximity to the renal veins via the left femoral vein approach. The use of the longer, but otherwise identical Bird's Nest Filter jugular catheter set via the left femoral vein eliminates this problem.

Femoral Vein↗
PubMedDate not supplied

In vitro flow phantom analysis and clot-capturing ability of incompletely opened Vena Tech-LGM vena caval filters.

It has been shown recently that Vena Tech-LGM (B. Braun Vena Tech, Evanston, IL) filters inserted into the inferior vena cava via the jugular route may be deployed sometimes in an incompletely opened (IO) position. The flow characteristics and clot capturing ability of IO Vena Tech-LGM filters are not clearly understood. Using a vena cava flow phantom, the clot-capturing abilities of the IO and opened Vena Tech-LGM filters were assessed. For 5 x 5-mm clots, the IO Vena Tech-LGM filter captured only 40% of thrombi compared with a 90% capture rate for the opened filter. The capture rates were 90 and 100% for the IO and opened filter, respectively, for larger 5 x 15-mm clots. It was found that the IO filter could capture 2-7 x 25 mm thrombi prior to the development of a turbulent bypass channel which prevented subsequent clot capture. Using 5 x 15 mm clots, this same phenomenon occurred with the capture of 6 and 11 thrombi by the IO and opened Vena Tech-LGM filters, respectively. Our results suggest a significantly reduced filtering efficiency for the IO Vena Tech-LGM device. However, there is a high rate of clot capture with the opened Vena Tech-LGM filter.

Efficiency↗
PubMedDate not supplied

Balloon occlusion versus wedged hepatic venography using carbon dioxide for portal vein opacification during TIPS.

Balloon occlusion hepatic venography using carbon dioxide (CO2) is proposed as a safer yet simpler alternative to wedged catheter techniques that have caused hepatic lacerations during the transjugular intrahepatic portosystemic shunt (TIPS) procedure. The image quality of CO2 wedged catheter and balloon occlusion venograms was comparable in our small series, with no venographic-related complications occurring in the balloon occlusion group.

Adult↗
PubMedDate not supplied

Quantification of the effects of respiration and parallax on inferior vena caval filter position.

PURPOSE: The change in inferior vena caval (IVC) filter position at follow-up relative to the filter position at implantation has been used as a criterion for evaluation and comparison of these devices. Perceived changes in filter position may be due to respiratory movement and/or changes in parallax between the initial and follow-up imaging studies. In this study the authors evaluated and attempted to quantify the effects of respiratory movement and parallax. PATIENTS AND METHODS: After placement of an IVC filter, radiographs of the abdomen were taken at maximum inspiration and maximum expiration in 30 patients. The effect of parallax on apparent filter movement was studied by using a phantom. RESULTS: The average filter movement on inspiration/expiration radiographs (corrected for magnification) was 3.6 mm +/- 2.2. An 8.5-mm maximal change secondary to parallax was seen in the phantom study. CONCLUSION: When follow-up images are obtained, efforts should be made to closely reproduce patient positioning and patient respiration to reduce errors in the interpretation of filter migration.

Follow-Up Studies↗