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Biomedical subjects

F Puente

Publications and source records attributed to F Puente.

13 recordsLinked to original sources
PubMed2001

Prostate brachytherapy: comparison of dose distribution with different 125I source designs.

PURPOSE: To evaluate the interchangeability of various commercially available iodine 125 ((125)I) sources and to assess the dosimetric effect of a change in source. MATERIALS AND METHODS: A modified peripherally loading prostate brachytherapy plan to deliver 145 Gy was devised by using a model (125)I source, which until recently was the only available (125)I source. A dose-volume histogram was generated. By using the available radial dose functions and anisotropy distributions for eight other currently commercially available sources, the same implant placement was planned and dose-volume histogram distributions tabulated. This exercise was performed for 15-, 45-, and 60-cm(3) glands. No implants were placed, and no physical radiation measurements were made. Dose calculations were theoretic: They were generated by using a widely available treatment planning system. RESULTS: There was little difference in dose distribution to the volume receiving 100% of the prescribed dose (<6%); only one source showed a difference greater than 2%. Large differences, up to -40% to +60%, were seen in the volume of tissue encompassed within internal high-dose regions receiving 150% or 200% of the prescribed dose. These findings held true, irrespective of gland size, within a clinically relevant range (15-60 cm(3)) and for a uniformly loaded radionuclide distribution. CONCLUSION: Reviewing only peripheral dose at or near the prescription dose of 145 Gy revealed little difference in doses for various source designs. Marked differences in high-dose regions were seen and may affect the dose received by internal sites. Effects of these changes on cure and/or complications remain speculative.

Brachytherapy↗
PubMed2000

Real-time optimized intraoperative dosimetry for prostate brachytherapy: a pilot study.

PURPOSE: To assess the feasibility of real-time intraoperative treatment planning for permanent prostate brachytherapy analyzing the impact on operative time and adequacy of postimplant dosimetry. METHODS AND MATERIALS: Seventeen consecutive patients undergoing permanent brachytherapy for prostate cancer had real-time intraoperative computer-based and optimized treatment planning. The first 8 patients were implanted using a plan generated before the surgery and served to assure the team qualitatively that this could be performed without greatly increasing intraoperative time. They served as control group for expected achieved dosimetry results reviewing the D90, V100, V150 parameters from the dose-volume histograms. The next 9 patients were implanted according to the real-time plan. The times needed to carry out various steps of the procedure were recorded. The achieved dosimetry was then compared to the control group to assure that accuracy was unchanged. RESULTS: The median operative time for patients undergoing intraoperative dosimetry was 57 min. Of this, 21 min were devoted to anesthesia and nursing functions. Postoperative dosimetry showed a median achieved V100 (volume of prostate receiving 100% of prescribed dose) of 97% for the control group. For the real-time dosimetry group, the median V100 was similar at 94%. The V150 (volume receiving 150%) is 49% for both groups. The D90 (dose received by 90% of the target) was normalized for easy comparison and was consistently slightly greater than the prescription dose. CONCLUSION: Treatment planning for permanent brachytherapy of prostate cancer has historically been performed as a computer-generated and optimized plan run weeks in advance of an implant, or according to a set pattern using an intraoperative nomogram. These data show that planning can now be optimized intraoperatively using widely available software without compromising the operative time or implant quality.

Combined Modality Therapy↗
PubMed1993

[In vitro granulopoietic cultures. Analysis using monoclonal antibodies].

Four monoclonal antibodies were applied, using an immunoenzymatic technique, the alkaline phosphatase anti-alkaline phosphatase, in granulopoietic cultures in vitro. In this manner, granulopoietic growth at tenth day of culture has been defined as positive for myeloid markers (CD15, CD11b) and negative for macrophagic (CD68) and proliferating cells (Ki 67) markers.

Adult↗
PubMed1989

[Moderate deficiency of Factor XII associated with postoperative deep venous thrombosis].

The interrelationship between factor XII deficiency (Hageman trait) and thrombosis is well known. A case of moderate factor XII deficiency (activity, 30%) associated to deep vein thrombosis, which occurred in the popliteal region of the left lower limb after abdominal surgery, is reported. The deficit was found in 4 family members of the three generations studied, and all of them showed a close interrelationship between factor XII activity and kallikrein levels. Prolonged APTT was found in 3 of the 4 affected subjects. A multiallelic model is suggested to explain the genetic transmission of this impairment.

Aged↗
PubMed1989

[Incidence of iron deficiency in a group of 922 candidates for volunteer blood donation].

Serum ferritin and haemoglobin rate were assessed in 637 men and 285 women, all of them seemingly healthy, who were about to donate blood for the first time. Serum ferritin rates suggesting iron deficiency were found in 1.88% of the men and in 9.47% of the women, anaemia being present in 7.69% of the iron deficiencies. Serum ferritin can be a useful parameter for the detection of latent iron deficiency in blood donors, and it may disclose the group of donors who should receive iron therapy, or should be recommended not to donate blood, without any significant increase on the cost per unit of blood.

Anemia, Hypochromic↗
PubMedDate not supplied

[Ligation of the ductus arteriosus in premature infants. Surgical considerations].

It is described the surgical interruption of Patent Ductus Arteriosus in ten premature newborn patients with cardiac insufficiency and/or respiratory distress syndrome. The authors mention the technical factors that they consider important to have good results with these fragile infants, as the use of local anesthesia; to perform the procedure in the neonatal intensive care unit, the extrapleural dissection of the ductus, etc. The post-operative care problems are analyzed and this experience is compared with reports from other authors.

Anesthesia, Local↗
PubMedDate not supplied

[Percutaneous transluminal angioplasty with a balloon catheter in native aortic coarctation: long-term experience].

Between August 1988 and October 1993, 19 patients with native aortic coarctation were subjected to transluminal percutaneous balloon angioplasty, 12 of which were men (63.1%) and 7 were women (36.9%), with an average age of 22 +/- 7.7 years (r- 16 to 52), all of whom suffered from arterial hypertension at the time of the procedure, and a systolic pressure of 190 +/- 32.2 mmHg (r- 160 to 240). The gradient of the systolic pressure (GPS) was 77 +/- 0.9 mm, the average diameter of the balloon catheters that were used was 18.3 +/- 1.7 mm (r- 15 to 20). For all the patients, the procedure was carried out under local anesthesia and the usual Seldinger technique. After carrying out the procedure, the GPS as well as the blood pressure dropped to 5.0 +/- 4.1 mmHg and 130 +/- 20.6 mmHg, respectively. In similar manner, the enlargement of the ring displayed an increase of 4.2 +/- 0.9 to 14.1 +/- 1.6 mm. There were no complications in any of the procedures. During the follow-up, 11 patients were catheterized again in a period of 24.7 +/- 12.6 months (r- 10 to 48) with GPS of 5 +/- 2 mmHg. Besides, an increase of 15.4 +/- 1.2 mm in the ring's diameter was observed. In these patients, there was no evidence of the aneurysms at the dilatation site. Of the rest of the patients under control, 17 of whom have been able to maintain normal blood pressure without medical treatment, and only two required low dosages of antihypertensive treatment.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMedDate not supplied

[Percutaneous transvenous mitral commissurotomy with a Medi-tech balloon catheter: the initial experience and midterm follow-up].

UNLABELLED: From Jan-21-91 to Jan-8-92 we performed percutaneous transvenous mitral commissurotomy (PTCM) with a Medi-tech balloon catheter (MBC) in 41 patients bearing mitral stenosis simple o predominant. We utilized an anterograde transseptal approach in order to access the mitral valve, the procedure failed in 5 patients, in 30 of them we used double MBC and single MBC were utilized in 6 patients. Both left ventriculogram and hemodynamic parameters were taken before and after PTCM. Posterior to PTCM an important decrease appeared in the mitral transvalvular gradient from 20.6 +/- 2.7 to 2.4 +/- 1.7 mmHg (p < 0.0001) and an average pressure of pulmonary artery of 46.2 +/- 9.8 to 23.9 +/- 6 mmHg (p < 0.0001), and also the pulmonary arterial resistance from 1178.1 to 557.1 dinas/cm-5/seg. There was an important concomitant increase in mitral valvular area from 0.84 +/- 0.11 to 2.38 +/- 0.08 cm2 (p < 0.0001) and in cardiac rate from 2.7 +/- 0.7 to 2.9 +/- 0.52 L/min (p < 0.001). COMPLICATIONS: Two female patients developed cardiac tamponade, one of them the procedure was successful, and for the other it was decided to submit her to valvular replacement. Mitral insufficiency was present in three patients; GI/IV in two of them and GII/IV angiographic in one. Another patient presented cerebral thromboembolism with complete recovery within 15 days. Short left to right shunt was detected only in 8 patients being 1.2/1 in 6 of them, 1.3/1 in one and 1.4/1 in other patient. Thirty three uncomplicated were dismissed within a maximum of 48 hours after procedure.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗