CCI - Cardiovascular Credentialing International Invasive Catheterization Procedures Questions and Answers — Questions and Answers
Question 1: A patient in the cardiac cath lab has the following right heart pressures recorded: Right Atrium (RA) mean = 15 mmHg, Right Ventricle (RV) = 45/15 mmHg, Pulmonary Artery (PA) = 45/25 mmHg, and Pulmonary Capillary Wedge Pressure (PCWP) = 22 mmHg. These findings are most indicative of which condition?
- Severe pulmonic stenosis
- Left-sided heart failure (Correct answer)
- Cardiac tamponade
- Normal hemodynamics
Correct answer: Left-sided heart failure
The elevated Pulmonary Capillary Wedge Pressure (PCWP) of 22 mmHg (normal is 6-12 mmHg) is a direct reflection of elevated left atrial pressure. This high pressure on the left side of the heart backs up into the pulmonary circulation, causing secondary pulmonary hypertension (elevated PA pressures) and subsequently elevated right-sided pressures (RV and RA). This pattern is classic for left-sided heart failure. [28, 30]
Question 2: During a right heart catheterization, the equalization of end-diastolic pressures across all four cardiac chambers (e.g., RA, RV, PA diastolic, and PCWP are all within 5 mmHg of each other) is a classic hemodynamic sign of which condition?
- Constrictive pericarditis (Correct answer)
- Mitral regurgitation
- Aortic stenosis
- Restrictive cardiomyopathy
Correct answer: Constrictive pericarditis
Constrictive pericarditis is characterized by a rigid, non-compliant pericardium that encases the heart and limits diastolic filling for all chambers equally. This results in the hallmark hemodynamic finding of elevated and equalized end-diastolic pressures. [14, 16] While restrictive cardiomyopathy can have some similar features, the classic and most defining characteristic of equalization points to constriction. [16, 20]
Question 3: A patient undergoes a left heart catheterization via the right femoral artery. Several hours post-procedure, the patient complains of severe low back pain and becomes hypotensive and tachycardic. Which of the following complications should be suspected first?
- Pseudoaneurysm at the access site
- Retroperitoneal bleed (Correct answer)
- Femoral artery thrombosis
- Arteriovenous fistula
Correct answer: Retroperitoneal bleed
A puncture of the femoral artery above the inguinal ligament can lead to bleeding that tracks into the retroperitoneal space. This concealed hemorrhage can accommodate a large volume of blood before external signs are visible. The combination of severe back or flank pain with hemodynamic instability (hypotension, tachycardia) is the classic presentation for a retroperitoneal bleed. [7, 8, 18]
Question 4: The Gorlin formula is a standard calculation used in the cardiac catheterization lab to determine which of the following parameters?
- Cardiac index
- Mitral regurgitant fraction
- Pulmonary vascular resistance
- Aortic valve area (Correct answer)
Correct answer: Aortic valve area
The Gorlin formula is a well-established hemodynamic calculation used to estimate the area of a stenotic valve, most commonly the aortic or mitral valve. It uses cardiac output, the systolic or diastolic filling period, heart rate, and the mean pressure gradient across the valve to derive the valve area in cm². [1, 4, 10]
Question 5: When engaging the left main coronary artery with a catheter, the pressure waveform abruptly changes, showing a sharp drop in diastolic pressure and a morphology that resembles a left ventricular tracing. This dangerous phenomenon, known as 'ventricularization,' is a critical sign of what?
- Successful passage into the left ventricle
- Severe aortic regurgitation
- Significant left main coronary artery stenosis (Correct answer)
- Severe mitral stenosis
Correct answer: Significant left main coronary artery stenosis
Ventricularization of the pressure waveform occurs when the tip of the catheter partially or fully occludes a significant stenosis at the ostium of the left main coronary artery. [11, 21, 23] The catheter tip is now recording the post-stenotic pressure, which is low and mimics the LV waveform, while simultaneously causing ischemia by blocking flow. This is a critical warning sign requiring immediate catheter withdrawal. [23, 26]
Question 6: Which of the following invasive measurements is used to assess the functional significance of a moderate coronary artery stenosis by calculating the ratio of pressure distal to the stenosis to the aortic pressure during maximal hyperemia?
- Intravascular Ultrasound (IVUS)
- Fractional Flow Reserve (FFR) (Correct answer)
- Optical Coherence Tomography (OCT)
- Ankle-Brachial Index (ABI)
Correct answer: Fractional Flow Reserve (FFR)
Fractional Flow Reserve (FFR) is a physiologic measurement that precisely defines the hemodynamic significance of a coronary stenosis. It is calculated as the ratio of the maximum blood flow in a stenotic artery to the maximum flow in the same artery if it were normal. This is measured by comparing the pressure distal to the stenosis with the aortic pressure during maximal vasodilation (hyperemia), typically induced by adenosine. [2, 9, 13]
CCI - Cardiovascular Credentialing International Invasive Catheterization Procedures Questions and Answers
A patient in the cardiac cath lab has the following right heart pressures recorded: Right Atrium (RA) mean = 15 mmHg, Right Ventricle (RV) = 45/15 mmHg, Pulmonary Artery (PA) = 45/25 mmHg, and Pulmonary Capillary Wedge Pressure (PCWP) = 22 mmHg.
These findings are most indicative of which condition?