Heart rhythm : the official journal of the Heart Rhythm Society
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The results from studies of the association of QT prolongation with cardiovascular death (CVD) have been inconsistent. ⋯ The Framingham, Hodges, and Fridericia equations remove the effect of heart rate on QT interval significantly better than the Bazett equation. Using QT-interval percentiles based on heart rate provides a consistent approach both for identifying those whose QT intervals prolong due to drugs or other stressors and for assessing CVD risk.
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Second-generation cryoballoon (CB2)-based pulmonary vein isolation (PVI) has demonstrated encouraging clinical results in the treatment of paroxysmal (PAF) and persistent atrial fibrillation (PersAF). However, the CB2 features a maximal diameter of 28 mm, and its adaptability to anatomic variations of the pulmonary veins (PVs) might be challenging. ⋯ Patients with an LCPV undergoing CB2-based PVI demonstrate a high acute success rate. Comparable results with regard to clinical success and durability of PVI were shown when comparing patients of the LCPV group and the control group.
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Off-label magnetic resonance imaging (MRI) for patients with cardiac implantable electrical devices has been limited owing to concerns about safety and unclear diagnostic and prognostic utility. ⋯ Off-label MRI scans performed under a strict protocol demonstrated excellent short- and medium-term safety while providing interpretable imaging that frequently influenced clinical care.