Defective recovery of QT dispersion predicts late cardiac mortality after percutaneous coronary intervention.

Background: It has been suggested that corrected QT dispersion (cQTD) provides a measure of repolarisation inhomogeneity; however, the existence of a relationship between cQTD and cardiac outcomes is controversial.

Objective: To assess whether changes in cQTD following percutaneous coronary intervention (PCI) predict long-term survival.

Design: Prospective observational study.

Rapid decline of collateral circulation increases susceptibility to myocardial ischemia: the trade-off of successful percutaneous recanalization of chronic total occlusions.

Objectives: We evaluated the time-behavior of changes in collateral circulation after successful percutaneous coronary intervention (PCI) with drug-eluting stents (DES) in chronic (>1 month) total occlusions (CTO), and assessed their relationship with myocardial ischemia.

Background: It has been hypothesized that the immediate reduction of collateral flow after PCI of CTO could expose the patients to a higher risk of future ischemic events in the case of vessel reocclusion.

Methods: In 42 patients with CTO, two consecutive balloon inflations and final DES deployment were performed after positioning of a pressure guidewire.

[QT dispersion and myonecrosis after stent percutaneous coronary intervention].

Background: QT dispersion (QTd) is the difference between the maximum and the minimum QT interval in the 12-lead ECG. There is currently no information on the relationship between QTd and creatine kinase (CK)-MB release in patients undergoing percutaneous coronary intervention (PCI).

Methods: Among 118 patients undergoing successful PCI stenting, QTd and corrected QTd (QTdc) were measured at standard 12-lead ECG before PCI and at 6 and 18 hours after PCI.