Symptoms
According to the univariate analysis, proband status was more frequent in the symptomatic group (100% vs 75%, p=0.004). Spontaneous type-1 classification was not different between groups (90.9 vs 75%, p = 0.161), but considering only standard leads, spontaneous pattern was more prevalent in the symptomatic than in the asymptomatic group (54.5% vs 27.8; p=0.014). The ECG parameters were not different between groups. Inducibility tended to be more frequent among symptomatic subjects (54.5 vs 28.5; p = 0.094). Invasive and non-invasive parameters are described in Table 2.
In the multivariate analysis, parameters like VT/FV induction (p=0.173), male gender (p=0.363) and spontaneous type-1 ECG pattern (p=0.459) showed no independent predictive value, regardless of symptoms. (Table 3)