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Figure 4 Receiver-operating characteristics of Valt and TWAR (discriminant levels indicated on curves) for VT at 120 beats/min, showing markedly superior specificity of (A) acceleration over (B) deceleration. Improved specificity and specificity (curves upward and to the right) follow the use of Valt over TWAR, late over whole JT segment analysis and acceleration over deceleration sequences at 500 ms CL pacing. Similar trends were evident at other CLs.
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