Figure 1From: Influence of the atrio-ventricular delay optimization on the intra left ventricular delay in cardiac resynchronization therapyMeasurement of the IACT in the VDD - Mode = MA-LA. MA = right atrial sensing marker (see marker channel). LA = left atrial deflection (see oesophageal ECG). In this particular patient the IACT is 48 ms.Back to article page