Diseases of the chest and the principles of physical diagnosis . of the orthodiagraph. The dotted line illustrates the oblique penetrationof percussion vibrations. A-B, orthodiagram shadow. A-C, percussion dulness. Lightvertical percussion (orthopercussion) minimizes lateral radiation and gives the most ac-curate results attainable by percussion. The tendency is generally to overestimate theleft and to underestimate the right cardiac border. The margin of error is increased incases of left ventricular enlargement and in patients with deep thoraces. The drawingfurther shows the deep situation o
Diseases of the chest and the principles of physical diagnosis . of the orthodiagraph. The dotted line illustrates the oblique penetrationof percussion vibrations. A-B, orthodiagram shadow. A-C, percussion dulness. Lightvertical percussion (orthopercussion) minimizes lateral radiation and gives the most ac-curate results attainable by percussion. The tendency is generally to overestimate theleft and to underestimate the right cardiac border. The margin of error is increased incases of left ventricular enlargement and in patients with deep thoraces. The drawingfurther shows the deep situation of the mitral, and the relatively superficial position ofthe tricuspid valves. (After Braiine.) 208 THE EXAMINATION OF CIRCULATORY SYSTEM slightly dull. (3) Percuss from the right mid-clavicular line and outlinethe right border in a similar manner. The points at which the clear pulmonary resonance becomes impairedshould be marked by means of a series of dots with a skin pencil orink. Connecting lines between these dots should not be drawn until Left vagusnerve. Right : ventricle Fig. 170.—\erliciil autero-posturiui- suciiuu thiuuyli ihu liourt showing this organ froma lateral aspect. In following the curv^e of the ribs during percussion from the sternum tothe axilla, if forcible percussion is used the cardiac dulness obtained will be equivalent notonly to the lateral boundary of the organ (which we wish to determine) but also to thedepth or antero-posterior diameter (which vitiates the results). The only part of the leftauricle which approaches the anterior chest wall is its appendage, which juts around thepulmonary artery and if greatly enlarged may cause an increase in dulness upward and tothe left. (Compare Fig. 163.) after the examination is complete, lest expectancy warp ones light border requires the heavier percussion; the heart at this pointrecedes from the chest wall and its location is often determined withdifficulty. Dulness normally extends slightly be
Size: 1697px × 1472px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1920
