Physiological Records Projected on a Screen [Retrospectroscope]

Discusses the ability to display physiological medical records that can be projected on a Screen.Presents the history of this equipment, beginning with Carl Ludwig. Ludwig (1816–1895), was the first to bring forward a scripture from the heart—the arterial blood pressure record—in 1847, by means of the kymograph [2]. The instrument soon spread throughout the world, becoming a must in any self-respected physiology laboratory, both as a teaching and research tool, persisting well into the mid-20th century. Discusses the development of this technology and reports on applications for its use.