LAS40

AcronymDefinition
LAS40Low Amplitude Signals Under 40 MicroVolts
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--Groups-- Parameter [G.sub.C] [G.sub.D1] QRS (ms) 80.30 [+ or -] 5.20 79.20 [+ or -] 6.30 LAS40 (ms) 20.90 [+ or -] 4.17 22.00 [+ or -] 6.20 RMS40 ([micro]V) 153.80 [+ or -] 52.56 124.20 [+ or -] 34.77 Noise 0.33 [+ or -] 0.16 0.38 [+ or -] 0.20 level([micro]V) --Groups-- Parameter [G.sub.D2] P value QRS (ms) 79.20 [+ or -] 8.28 0.927 LAS40 (ms) 21.40 [+ or -] 6.02 0.927 RMS40 ([micro]V) 128.20 [+ or -] 44.90 0.438 Noise 0.36 [+ or -] 0.20 0.878 level([micro]V) P value, significance level of one-way ANOVA; QRS, filtered QRS duration; LAS40, duration of the low-amplitude signal below 40[micro]V in the last 40 milliseconds of the QRS; RMS40, root mean square voltage of the last 40 milliseconds of the QRS; ms, milliseconds; pV, microvolt.
The best and most correlations were found for SA-QRS, but RMS40 and LAS40, correlated, as well with 12-lead ECG parameters.
Amiodarone prolongs the total QRS duration and LAS40 and significantly reduces RMS40 (24).