title: A volume-displacement plethysmograph to measure limb blood flow in the newborn infant.
abstract: An instrument is described that measures limb blood flow in newborn infants by venous occlusion plethysmography. The plethysmograph is filled with air and a pneumotachygraph measures the volume displaced during venous occlusion. The response of the system is linear for flows over the range 1 to 100 ml/min and the frequency response to a square wave pressure change is 22 Hz with a 95% response time of 0.5 second. The average flow in the forearm of 10 normal newborn infants was 5.9 ml/min per 100 ml of tissue.
mesh_terms: D001783:Blood Flow Velocity; D001811:Blood Volume Determination / Q000295:instrumentation*; D005121:Extremities / Q000098:blood supply*; D006801:Humans; D007231:Infant, Newborn; D010991:Plethysmography / Q000295:instrumentation*; D012039:Regional Blood Flow