The Effect of a Hyperdynamic Circulation on Tissue Doppler Values: A Simulation in Young Adults during Exercise

Table 4

Interobserver variability.

	Mean	Mean difference	Limits of agreement (±2SD) (%)
LV EDV (mL)	84.5	7.2	4.5 (5.3)
LV ESV (mL)	40.5	4.3	2.4 (6.0)
EF (%)	53.5	1.2	2.3 (4.3)
Left Atrial area (cm^2)	14.4	0.4	0.6 (4.3)
Interventricularseptal thickness (cm)	0.8	0.0	0.1 (7.7)
Posterior wall thickness (cm)	0.8	0.1	0.0 (5.5)
LV internal dimension (diastole) (cm)	4.3	0.4	0.2 (4.2)
LV mass (g)	119.4	7.3	16.3 (13.7)
Tissue Doppler imaging velocities
S′	8.3	0.3	0.3 (3.1)
E′	12.8	0.1	0.2 (1.4)
A′	5.3	0.2	0.1 (2.1)

All velocities are in cm·s⁻¹; S′: peak systolic velocity; E′: peak early diastolic velocity; A′: peak late diastolic velocity; mean: average of two observers; Mean difference: difference of means between two observers expressed as a positive value. Limits of agreement: two standard deviations of the difference as a percentage of the average value of the mean difference. Percentage (%) is relative to the mean.