RESUMO
Since polyurethane was introduced as an insulation material for pacing leads, it has been purported that passing two polyurethane leads through one vein would be significantly easier than passing two bipolar silicone leads. However, this case, in which two bipolar silicone leads were easily positioned via a single cephalic vein, raises the question of whether there is any clinically significant in vivo lubricity difference between the two materials.
Assuntos
Braço/irrigação sanguínea , Bloqueio Cardíaco/terapia , Marca-Passo Artificial , Síndrome do Nó Sinusal/terapia , Idoso , Humanos , Masculino , SiliconesRESUMO
An osteosarcoma, primary in the right ventricular epicardium, produced pericardial constriction. Intense activity on technetium-99m bone scintigraphy led to a correct preoperative diagnosis. Biopsy of unrepresentative tissue clouded the diagnosis, and autopsy resolved the issue. Several clinicopathologic correlations are presented. Major therapeutic advances mandate early recognition of extraskeletal osteosarcoma, and the topic is reviewed in regard to cardiac cancers in general. The need to biopsy both hard and fleshy areas of unusual tumors is reviewed.
Assuntos
Neoplasias Cardíacas/diagnóstico , Osteossarcoma/diagnóstico , Idoso , Neoplasias Cardíacas/patologia , Ventrículos do Coração , Humanos , Masculino , Osteossarcoma/patologiaRESUMO
Forty newborn infants, median age 9 minutes, turned their eyes and heads to follow a series of moving stimuli. Responsiveness was significantly greater to a proper face pattern than to either of two scrambled versions of the same stimulus or to a blank. The demonstration of such consistent response differences suggests that visual discriminations are being made at this early age. These results imply that organized visual perception is an unlearned capacity of the human organism. The preference for the proper face stimulus by infants who had not seen a real face prior to testing suggests that an unlearned or "evolved" responsiveness to faces may be present in human neonates.