Background The right atrial longitudinal strain (RALS) has been
shown to be a useful parameter to define right atrial (RA) subclinical
dysfunction in several cardiovascular disorders prior to changes in
traditional RA two dimensional and volumetric parameters. There is a
scarcity of data regarding normal values for RALS in a normal African
population. Objectives We sought to establish normal values for
RALS and its correlation with age, in a Sub-Saharan black African
population. Methods This was a retrospective cross-sectional
study of 100 normal individuals (recruited as controls for another
study) performed at Chris Hani Baragwanath Hospital (2017-2019). All
echocardiographic measurements were done as per standard guidelines.
RALS was measured using Philips QLAB 9 (Amsterdam, The Netherlands)
speckle-tracking software. Results Median age was 37.5 years
(IQR 26- 46, 60% females). The mean right atrial volume indexed to body
surface area (RAVI) was 19.5 ± 5.7 mL/m and the mean
RALS was 32.7 ± 10.5%. There was a trend towards decreasing RALS with
age (r=-0.15, P=0.129) with no change in RAVI with age ( P=0.27). Males
had a tendency towards higher RAVI and RALS measurements compared to
females (20.8 ± 6.3 mL/m and 18.7 ± 5.2 mL/m
, P=0.07: 34.6 ± 9.6% and 31.4 ± 10.9 %, P=0.141,
respectively) . BMI was an independent predictor of RALS on multivariate
analysis ( r= -0.43, P =0.003) Conclusion We have defined the
normal reference values for RALS in a black population. RALS tended to
decrease with age prior to change in RAVI and can serve as a marker of
subclinical RA dysfunction . BMI was an important determinant of RALS.