Updated February 24, 2017. The mean or average birth weight in the United States is about 3,389g or 7 lb, 7.5 oz. However, any birth weight of a term newborn between 5 lbs, 8 oz and 8 lbs, 13 oz is considered to be normal. Baby Birth Weight Statistics.
Development of coronary stents. WALLSTENTÂ® (Schneider AG), a self-expanding, stainless steel wire-mesh structure, was the first coronary stent implanted in a human coronary artery by Sigwart et al. in 1986.
Medical students listening to their heartbeats using a multiple stethoscope, c.1920s. Credits:Wellcome Library, London. RenÃ© Laennec invented the stethoscope in 1816. While consulting a female patient, Laennec needed to listen to the womanâs chest. Before the stethoscope, doctors would place their ear directly onto the patientâs chest, a practice called auscultation.