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Biomedical subjects

L E Pena

Publications and source records attributed to L E Pena.

3 recordsLinked to original sources

[Anatomic reconstruction of native coronary arteries and vein graft with less shortening wallstent].

PURPOSE: To evaluate the advantage of the wallstent in the treatment of long or multiple lesions. METHODS: Thirty eight patients with mean age 66 years underwent wallstent implantation. Fourteen had lesions in the left anterior descending, 12 in the right coronary, nine in the circumflex and four in a vein graft. The technique for implantation requires an accurate quantification of the vessel diameter, because the chosen stent should be 1.5 mm larger than the target vessel. A new technique using additional inflations with high pressure balloons was applied. RESULTS: Successful implantation occurred in 95%. We did not have success in two patients. One of them due to damage in the stent and the other to unsuccessful liberation. Both patients were submitted to conventional angioplasty without complications. CONCLUSION: The wallstent implantation can be successfully performed with high success rate, but late angiographic results still demand further studies.

Adult

Structural rheology of a model ointment.

A model ointment consisting of white petrolatum, mineral oil and microcrystalline wax was studied using rheology, microscopy and thermal techniques. Rheograms studied over a temperature range of 25-40 degrees C indicated that the overall rheogram shape changed little as the temperature increased. However, two inflections gradually disappeared as the temperature increased. Thermal optical analysis showed that the temperature range over which these inflection disappeared correlated with the melting transition of the components forming the secondary structure. Another series of rheograms obtained from ointments with different combinations of the raw materials showed the rheology of the ointment is primarily controlled by the white petrolatum and mineral oil and that the microcrystalline wax acts to build-up the structure by incorporating itself into the existing white petrolatum structure. Thermal optical analysis of comelts of the raw materials proved that the ointment network structure is essentially a recombination of the naturally occurring components in differing ratios. The knowledge obtained from these studies is applied to a discussion of the thermal and mechanical stresses encountered in the filling operation.

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