title: Range of frontal plane QRS axes. Electrocardiograms of subjects in a multiphasic screening program.
abstract: The range of mean QRS axes in the frontal plane was determined in electrocardiograms of subjects examined in a program of periodic health screening. Fifty-three of 5,163 individuals had a mean frontal QRS axis between -30 degrees and -60 degrees. Fourteen individuals had an axis between +110 degrees and +133 degrees. These findings suggest that individuals with no history of heart disease may manifest a considerable range of frontal plane QRS axes often to a degree previously considered abnormal. The axes were calculated by the use of leads 1 and 3. Other leads, or the use of the method of Grant, would give different results. Comparison of series of patients can be made only if these variables are understood.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009098:Multiphasic Screening