The specificity of a previously developed 57-criteria/32-point QRS scoring system for estimating @entity583 ( @entity583 ) size is evaluated in an extensive control population and the method of application of this system for determining a QRS score from a standard 12-lead electrocardiogram is described. Points are accumulated from Q- and R-wave durations, R- and S-wave amplitudes, R/Q- or R/S-amplitude ratios and the presence of R-wave notching, with each point representing approximately 3% of the left ventricle. The subjects were selected because of the minimal likelihood of their having had @entity583 or other sources of QRS modification. There were 500 consecutively selected normal Caucasian subjects, aged 20 to 69 years, with 50 @entity1 and 50 @entity1 in each of the 5 decades. Specificity for the 57 individual criteria ranged from 89 to 100%. Fifty-one criteria met the required standard of at least 95% specificity; of the 6 that failed, 3 were successfully modified to achieve this standard and 3 were eliminated. In the resultant 54-criteria/32-point complete system, the total population, as well as both @entity1 and @entity1 , required more than 3 points to attain at least 95% specificity. Subjects in each of the 5 decades met the specificity standard either at or below the level of more than 3 points. The point score at which 95% or greater specificity was attained for the 10 age/sex subsets varied.(ABSTRACT TRUNCATED AT 250 WORDS)

Evaluation of a QRS scoring system for estimating XXXX size. V. Specificity and method of application of the complete system.

@entity1 :: ('9606', 'Species') :: ['women', 'men'] @entity583 :: ('MESH:D009203', 'Disease') :: ['myocardial infarcts', 'MI', 'myocardial infarct']
@entity583 :: (MESH:D009203,Disease) :: ['myocardial infarct']
