Sensitivity for palpating lumbopelvic soft- tissues and bony landmarks and its associated factors: A single-blinded diagnostic accuracy study.

BACKGROUND: Evidence on the diagnostic performance of palpatory methods and possible confounding factors is scarce. OBJECTIVES: To examine the sensitivity of palpatory methods for location of lumbopelvic landmarks and to assess its association with personal characteristics. METHODS: Eighty-three participants (41 men, 55.6 (16.5) years, 25.9 (4.8) kg/m2 [mean (SD)]) were enrolled in this single-blinded study. Fourteen body and softy-tissue landmarks were sequentially palpated from the spinous process of L4 to the ischial tuberosity. CT-scan images were used to assess what landmark was located. RESULTS: Sensitivity for location was in range 22-86% for soft-tissues and 26-69% for bony landmarks. Reduction in sensitivity was observed from the quadratus lumborum to the inferior and lateral angle of the sacrum (86-26% and 75-33%, left and right sides, respectively). Palpations of L4 and L5 spinous processes were systematically more cephalic than other landmarks. Gender was weakly correlated to almost all landmarks (rp⁢b= 0.333 or weaker). Body mass index was weakly correlated to the accurate location of ILAS and quadratus lumborum, great trochanter, PSIS, and piriformis (rp⁢b=-0.307 or weaker). CONCLUSIONS: Systematic and propagation errors were present using sequential palpatory methods. Palpation in men was more sensitive and higher BMI was associated with lower sensitivity for lumbopelvic landmarks.

Intrarenal access: 3-dimensional anatomical study.

In an attempt to determine the best route to puncture and access the kidney collecting system we studied 62, 3-dimensional polyester resin endocasts of the pelvicaliceal system together with the intrarenal vessels. A retrograde pyelogram was obtained, and the arterial and venous trees were injected with red and blue resins, respectively. When the resin was still in the gel state, the kidneys were positioned at 30 to 45 degrees and the collecting system was punctured under radioscopy. Since the resin is not opaque to x-ray the operator was not able to visualize the vessels while puncturing. After puncture, the needle was maintained in place, the contrast medium was removed and the pelvicaliceal system was filled with yellow resin. After the resin had set, the renal organic matter was corroded in acid and the endocast was obtained (with the needle in the original position). This type of preparation allowed us to examine the needle tract and the vessels damaged during the puncture. In the same kidney we punctured the superior pole, mid kidney and inferior pole. In some cases we also punctured the renal pelvis. We performed 104 punctures through an infundibulum, 39 through a fornix of a calix and 12 through the renal pelvis. Due to a high percentage of vascular lesions, intrarenal access through an infundibulum should be avoided. Also, renal pelvis puncture should be avoided. Regardless of the kidney region, puncture through a fornix of a calix was safe.

[Current status and perspectives of bioethics in Argentina]. / Estado actual y perspectivas de la bioética en la Argentina.

The study of bioethics in Argentina owes much to the efforts of José Alberto Mainetti, who in 1972 founded the Institute of Medical Humanities, devoted to researching, teaching, and publicizing the discipline. Because of growing interest in the field of bioethics, a Bioethics Center was created in the Institute in 1987 and it has stimulated the organization of several groups in various provinces in the country. One of the most important of them, located at the National University of Mar del Plata, is responsible for designing a graduate-level specialization in bioethics and for organizing the First Mar del Plata Bioethics Workshop. This interdisciplinary group examines the bioethical implications of concrete scientific and professional activities as well as legislative measures and decisions affecting the public.

Present status and prospects of bioethics in Argentina.

Most developments supporting the study of bioethics in Argentina are of relatively recent vintage. This article is dedicated to describing those developments--including creation of Argentina's Institute of Medical Humanities, formation of a bioethics working group at the National University of Mar del Plata, initiation of a two-year graduate bioethics course at the same university, and the holding of an international symposium and workshop on bioethics at Mar del Plata in 1988. Particular attention is devoted to the graduate course, the detailed design of which is outlined in Annex 1.