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. 2015 Feb 12;1(3):89–94. doi: 10.1016/j.hrcr.2015.01.019

Figure 3.

Figure 3

Different regions are mapped in the outflow tract region: 1. Septal LVOT: small presystolic sharp signal at −22 ms from the onset of the QRS. 2. Great cardiac vein: local signal at +32 ms from the onset of the QRS. 3. Aortic cusps: presystolic local signal −4 ms from the onset of the QRS. 4. RVOT: local electrogram at −14 ms compared with the onset of the QRS. 5. Intraseptal: the unipolar signal of the guidewire shows a QS signal slightly before (±24 ms) the onset of the QRS. The exact onset of the unipolar signal was not easy to define in this case. CS = coronary sinus; d = distal; LVOT = left ventricular outflow tract; p = proximal; RF = radiofrequency; RVOT = right ventricular outflow tract.