Abstract
The mean frontal plane QRS axis of 658 patients between 60 and 94 years of age was obtained: 313 (48 per cent) were males, and 345 (52 per cent) were females. There were 308 patients without cardiovascular disease (Group I) and 350 patients with cardiovascular disease (Group II). These were divided by age into 5-year subgroups. In Group I the mean of the QRS axis showed no significant trend to the left with age, whereas in Group II there was a marked leftward trend in the ninth and the tenth decades. In the last three 5-year subgroups the means of the frontal plane QRS axis in Group I were 16.8, 23.2, and 22.2 degrees, respectively, and corresponding values in Group II were 5.1, 0.6, and −15.6 degrees. The differences between the means in the last two subgroups are statistically significant. The proportion with left axis deviation (−30 degrees or above) was greater in Group II than in Group I, particularly in the last two 5-year subgroups. The percentages were as follows: Group II, 26 and 42; Group I, 12 and 8.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
