Ethnic differences in left ventricular remodeling in highly-trained athletes relevance to differentiating physiologic left ventricular hypertrophy from hypertrophic cardiomyopathy.
OBJECTIVE
The purpose of this study was to evaluate ethnic differences in left ventricular (LV) remodeling between highly-trained athletes of African/Afro-Caribbean (black) and Caucasian (white) athletes.


BACKGROUND
The upper limits of left ventricular hypertrophy (LVH) are established in white athletes and aid the differentiation of physiologic LVH from hypertrophic cardiomyopathy (HCM). However, there are few data regarding LV remodeling in black athletes, in whom deaths from HCM are more prevalent.


METHODS
Between 2003 and 2007, 300 nationally ranked black male athletes (mean age 20.5 years) underwent 12-lead electrocardiogram and 2-dimensional echocardiography. The results were compared with 150 black and white sedentary individuals and 300 highly-trained white male athletes matched for age, size, and sport.


RESULTS
Black athletes exhibited greater LV wall thickness and cavity size compared with sedentary black and white individuals. Black athletes had greater LV wall thickness compared with white athletes (11.3 +/- 1.6 mm vs. 10 +/- 1.5 mm; p < 0.001). In absolute terms, 54 black athletes (18%) had LV wall thickness >12 mm compared with 12 white athletes (4%), and 3% of black athletes exhibited LV wall thickness >/=15 mm compared with none of the white athletes. Black athletes with LVH displayed an enlarged LV cavity and normal diastolic function.


CONCLUSIONS
Black athletes develop a greater magnitude of LVH compared with white athletes; therefore, extrapolation of conclusions derived from white athletes has the potential of generating false-positive diagnoses of HCM in black athletes.
Basavarajaiah
Sandeep
S
King's College Hospital, London, United Kingdom.
Boraita
Araceli
A
Whyte
Gregory
G
Wilson
Mathew
M
Carby
Lorna
L
Shah
Ajay
A
Sharma
Sanjay
S
D000293:Adolescent; D000328:Adult; D001741:Black or African American / Q000706:statistics & numerical data; D000465:Algorithms; D002312:Cardiomyopathy, Hypertrophic / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000208:ethnology*; D016022:Case-Control Studies; D006352:Heart Ventricles / Q000000981:diagnostic imaging*; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000208:ethnology*; D008297:Male; D012016:Reference Values; D013177:Sports; D011795:Surveys and Questionnaires; D014463:Ultrasonography; D014481:United States / Q000453:epidemiology; D020257:Ventricular Remodeling; D044465:White People / Q000706:statistics & numerical data