Related Experiment Video
Updated: May 17, 2026
10:28
Interventional Diagnostic Procedure: A Practical Guide for the Assessment of Coronary Vascular Function
Published on: March 15, 2022
QT Dispersion: Does It Change after Percutaneous Coronary Intervention?
Mohammad Alasti1, Mohammad Hassan Adel, Ekhlas Torfi
1Imam Khomeini Hospital, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
The Journal of Tehran Heart Center
|October 18, 2012
Summary
Percutaneous coronary intervention significantly reduces corrected QT dispersion and corrected JT dispersion in patients with chronic stable angina, improving cardiac repolarization.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Myocardial ischemia can cause prolonged QT dispersion.
- Chronic stable angina is a common condition affecting many patients.
- QT dispersion is an important indicator of cardiac repolarization.
Purpose of the Study:
- To evaluate the impact of percutaneous coronary intervention (PCI) on electrocardiography (ECG) parameters.
- To assess changes in depolarization and repolarization after PCI in patients with chronic stable angina.
Main Methods:
- Patients with chronic stable angina and single-vessel disease underwent PCI.
- Twelve-lead ECGs were recorded before and 24 hours after PCI.
- QRS duration, QT, corrected QT, JT, and corrected JT durations were measured and compared.
Main Results:
- PCI led to a significant reduction in mean corrected QT dispersion (0.080 ± 0.04 sec vs. 0.068 ± 0.04 sec; p=0.001).
- PCI also significantly reduced mean corrected JT dispersion (0.074 ± 0.04 sec vs. 0.063 ± 0.04 sec; p=0.001).
- A significant decrease in QRS interval was observed (0.086 ± 0.01 sec vs. 0.082 ± 0.01 sec; p=0.01).
Conclusions:
- PCI prominently shortens corrected QT dispersion and corrected JT dispersion.
- These findings suggest PCI improves cardiac repolarization in patients with chronic stable angina.
Related Concept Videos
01:27Coronary Artery Disease V: Interprofessional Care
Interprofessional care for coronary artery disease includes pharmacological therapy and revascularization procedures.Pharmacological therapy for Coronary Artery Disease (CAD) aims to manage symptoms, prevent complications, and improve patient outcomes through various classes of medications:Antiplatelet Agents:Aspirin and Clopidogrel: These medications inhibit platelet aggregation, preventing blood clots, which is crucial for avoiding heart attacks and strokes. Doctors often prescribe these...
01:28Acute Coronary Syndrome IV: Interprofessional Care
IntroductionThe management of Acute Coronary Syndrome (ACS) aims to minimize myocardial damage, preserve myocardial function, and prevent complications.Initial ManagementInpatient management involves continuous cardiac monitoring, preferably in an ICU, focusing on blood pressure, serum sodium, potassium, and creatinine levels, and urine output. Ongoing pharmacologic management is crucial for stabilizing the patient.Supplemental Oxygen: Administer supplemental oxygen if oxygen saturation is...
01:28Cardiac Catheterization I: Pre-Procedure Overview
Cardiac catheterization is an invasive diagnostic technique used to identify and evaluate structural and functional diseases of the heart and major blood vessels. This technique diagnoses congenital heart disease, coronary artery disease, valvular heart disease, and coronary spasms and assesses ventricular function. It helps guide treatment decisions, including the need for revascularization procedures like percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG) and...
01:26Cardiac Catheterization IV: Nursing Management
Nursing responsibilities before cardiac catheterization include:Assess for allergies and establish baseline health status.Before cardiac catheterization, assess the patient for allergies to contrast dye. Perform a comprehensive baseline assessment, including vital signs, heart and breath sounds, and a neurovascular assessment of the extremities, noting distal pulses, skin color, and temperature. Instruct the patient to fast for 8-12 hours before the procedure. Evaluate baseline laboratory...
01:27Peripheral Artery Disease III: Interprofessional Care
Peripheral Artery Disease (PAD) is characterized by narrowed arteries that diminish blood flow to the extremities. Effective management of PAD requires an interprofessional approach involving various healthcare professionals. The critical aspects of interprofessional care for PAD patients focus on risk factor modification, drug therapy, exercise therapy, nutrition therapy, critical limb ischemia care, and interventional radiology and surgical procedures.The primary treatment goal for PAD...
01:21Cardiac Catheterization II: Right Heart Catheterization
Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...