Ted that up to a maximum of 20% of the surface of the tissue where radiofrequency has been applied (areas usually marked by lesion dots on the 3d navigation systems) may correspond to viable tissue (not affected by gadolinium late-enhancement) . To date, however, the efficacy of this approach to detect very small bundles of viable atrial myocytes has not been validated. An indirect way to suspect the presence of conduction gaps in ablation lines is the simultaneous achievement of at interruption and bidirectional block across the line using a single or a few focal radiofrequency applications . viagra and vision side effects A detailed activation map can offer a more direct proof of the participation of gaps in a mr circuit when the activation front traverses perpendicularly the place where a prior ablation line was created [21, 60]. buy viagra cheap
The exact position of ablation lines relative to the at circuit can be checked by side-by-side comparison of the at activation map and the tridimensional reconstruction of the la obtained during the initial af ablation procedure, or with techniques of image integration implemented in modern 3d navigation systems, which allow for a more exact delineation of the spatial relationship between incomplete ablation lines and the circuit of the at . viagra pills
The most direct evidence which identifies a conduction gap is the presence of a single potential flanked by double potentials. The single potential (frequently fractionated) corresponds to the viable muscle and the double potentials to the ablation line lying at both sides of the gap . viagra generic
5. should i take viagra before or after meal 1. can women take viagra viagra 3. coumadin viagra interactions Conduction properties of gaps noncontact mapping technology has provided greatly detailed images of the activation wavefront propagation across an ablation line through a gap: the activation front narrows upon reaching the gap and widens again at the other side of the line . viagra and vision side effects However, electrical conduction through discontinuous ablation lesions is a complex phenomenon influenced by the width of the gap, its geometry, and possibly the time elapsed since the lesions were created. viagra wholesale
In this sense, certain experimental models suggests that there is a minimum width necessary for gaps to conduct (habitually 3 mm ). best generic viagra online
Besides, the gap size can modulate the conduction velocity of the wavefront crossing it, in such a way that the narrower the gap, the slower the conduction velocity [93. generic viagra canada
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