Ease of insertion of exposed helical coil tip and tined silicone leads through single cephalic vein.

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.

Primary cardiac osteosarcoma: multidisciplinary aspects applicable to extraskeletal osteosarcoma generally.

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.

Visual following and pattern discrimination of face-like stimuli by newborn infants.

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.