Diseases of the chest and the principles of physical diagnosis . Fig. 168.—OETHOPEECussIO^^ The tendency is for the examiner to underestimate the-right, and overestimate the left, border of the heart. This error may be minimized by-using ortho-percussion with a very light •Fig. 169.;—Horizontal section through the chest. Showing the unavoidable margin oferror in outlining the left cardiac border by percussion. The solid line indicates the ver-tical penetration of the orthodiagraph. The dotted line illustrates the oblique penetrationof percussion vibrations. A-B, orthodiagram shadow. A
Diseases of the chest and the principles of physical diagnosis . Fig. 168.—OETHOPEECussIO^^ The tendency is for the examiner to underestimate the-right, and overestimate the left, border of the heart. This error may be minimized by-using ortho-percussion with a very light •Fig. 169.;—Horizontal section through the chest. Showing the unavoidable margin oferror in outlining the left cardiac border by percussion. The solid line indicates the ver-tical penetration 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1920
