Engineering topics
Publications and source records attributed to Wood, E. H..
Developments in the following areas are discussed: television camera in dynamic angiography, dynamic computer generated displays for study of the human left ventricle, and status report on the work statement for the sixth year. A list of publications for the period 1 October 1971 to 1 October 1972 is included.
Dependent pulmonary atelectasis, arterial-venous shunting, and downward displacement of the heart caused by the gravitational-inertial force environment were prevented in dogs breathing oxygenated liquid fluorocarbon in a whole-body water-immersion respirator. Partial closure of the major airways during part of the expiratory phase of liquid respiration was a significant problem initially but was minimized in subsequent studies.
Dogs intrapleural and intraesophageal pressures dependence on head positions
Effects of positive Gy acceleration on blood oxygen saturation and pleural pressure relations in dogs breathing air and liquid fluorocarbons in whole body water immersion respirator
A roentgen-television digital-computer technique and a display system developed for dynamic circulatory structure studies are described. Details are given for a videoroentgenographic setup which is used for obtaining biplane roentgen silhouettes of a left ventricle. A 60 per sec measurement of the shape and volume of angiographically outlined cardiac chambers can be made by this technique along with simultaneous ECG, pressure, and flow measurements accessible for real-time digital computer processing and analysis.
Body position effect on oxygen saturation of regional pulmonary venous blood and arterial- venous shunts in intact dogs
Two methods whereby a digital computer may be used to regulate a scintiscanning process are discussed from the viewpoint of computer input-output software. The computer's function, in this case, is to govern the data acquisition and storage, and to display the results to the investigator in a meaningful manner, both during and subsequent to the scanning process. Several methods (such as three-dimensional maps, contour plots, and wall-reflection maps) have been developed by means of which the computer can graphically display the data on-line, for real-time monitoring purposes, during the scanning procedure and subsequently for detailed analysis of the data obtained. A computer-governed method for converting scintiscan data recorded over the dorsal or ventral surfaces of the thorax into fractions of pulmonary blood flow traversing the right and left lungs is presented.
Position dependent variations in intrapericardial, pleural and esophageal pressures and cardiac output in thorax of dogs
Effects of gravitational and inertial forces on cardiovascular and respiratory dynamics
Vertical distribution of pulmonary blood flow /DPBF/ in dogs without thoracotomy prone, supine, head-up, head-down and right and left decubitis positions
Computer photokymographic recording of gravitational-inertial force environment effects on cardiovascular and respiratory systems on centrifuge
Pleural space of dogs investigated by spheres injection of varying density and diameter, discussing sedimentation velocities
Regional pulmonary arterial-venous shunting in dogs exposed to acceleration in different body positions
Gravitational and inertial force environment effects on cardiovascular and respiratory functions in dogs and chimpanzees
Description of biplane videoangiographic system for dynamic measurement of left ventricle shape and volume
Roentgen video densitometer study of mitral valve closure during fibrilation, discussing atrial contraction role on ventricular function in normal and failing heart
Dichromatic earpiece densitometry for cardiac output determination, obtaining dilution curves after venous dye injection into humans during rest and exercise
Effects of gravitational and inertial forces on cardiovascular and respiratory dynamics