14.17
Cardiac Catheterization III: Left Heart Catheterization
Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is genera…
Left heart catheterization is a medical procedure used to evaluate the aortic arch, its major branches, the function of the left ventricle, the mitral and aortic valves, and the patency of the coronary arteries.
It involves retrograde catheterization of the left ventricle, in which the catheter is inserted into a radial, femoral, or brachial artery and advanced into the aorta and left ventricle.
Left heart catheterization involves techniques such as angiography, coronary angiography, and ventriculography, each assessing different aspects of heart health.
Angiography involves injecting a contrast fluid into an arterial catheter to visualize blood flow through the left heart chambers, the aortic arch, and the major arteries.
Coronary angiography is a technique in which a catheter is positioned in a coronary artery, and a contrast agent is injected to observe its anatomy.
Ventriculography evaluates the left ventricle's size and function by injecting a contrast agent to enhance its visibility on imaging.
During left heart catheterization, catheter manipulation and contrast injection can cause myocardial ischemia and arrhythmias, necessitating vigilant monitoring.
View the full transcript and gain access to JoVE Core videos
Q1: What structures does left heart catheterization evaluate?
Left heart catheterization evaluates the aortic arch and its major branches, left ventricle function, mitral and aortic valve competency, and coronary artery patency. The procedure uses retrograde catheterization, where a catheter is inserted through a radial, femoral, or brachial artery and advanced into the aorta and left ventricle to assess cardiac structure and function.
Q2: How does coronary angiography differ from ventriculography?
Coronary angiography positions the catheter in a coronary artery and injects contrast to visualize arterial anatomy and detect blockages. Ventriculography evaluates the left ventricle's size and function by injecting contrast to enhance its visibility on imaging. Both techniques use contrast agents but target different cardiac structures for diagnostic assessment.
Q3: What role does fluoroscopy play during left heart catheterization?
Fluoroscopy is a continuous X-ray imaging technique that allows physicians to visualize catheter movement and placement in real-time. It ensures accurate navigation through the arterial system into the aorta and left ventricle, guides contrast injection, and enables identification of blockages or structural abnormalities. Fluoroscopic guidance also supports interventional procedures like angioplasty or stent placement.
Q4: What complications can occur during left heart catheterization?
Catheter manipulation and contrast injection can cause myocardial ischemia and arrhythmias, requiring vigilant monitoring. Post-procedure complications include bleeding, hematoma, perforation of the left heart or great vessels, and systemic embolization. Patients must be monitored closely after the procedure to detect and manage these potential adverse events promptly.
Q5: What are the key pre-procedure preparations for left heart catheterization?
Pre-procedure preparations include discontinuing oral anticoagulants 24 hours prior, obtaining thorough history with emphasis on contrast allergy, examining access sites and documenting peripheral pulses, and checking hemoglobin, platelets, creatinine, and coagulation profile. IV normal saline is administered to prevent contrast-induced renal dysfunction, especially in patients with renal impairment.
Q6: How is the catheter inserted and positioned during the procedure?
A fine needle is inserted into the selected artery, and a flexible guide wire is threaded through it. A sheath is placed over the guide wire to facilitate catheter access. The catheter is then introduced through the sheath and navigated to the heart using fluoroscopic imaging, ensuring accurate placement in the aorta, left ventricle, or coronary arteries depending on the procedure's diagnostic or therapeutic purpose.
Q7: What diagnostic and therapeutic purposes does left heart catheterization serve?
Left heart catheterization assesses coronary artery bypass grafts, evaluates coronary artery disease in patients with chest pain, determines severity of myocardial or valvular disorders such as aortic stenosis and mitral stenosis, and assesses cardiac arrhythmias. Therapeutically, it treats valvular heart diseases through procedures like valvuloplasty and can perform interventional procedures when blockages are detected.