Diagnostic Cardiac Catheterization and Coronary Angiography¶
Chapter 249 | Part 6: Disorders of the Cardiovascular System
KEY CLINICAL POINTS¶
- Cardiac catheterization is the second most common operative procedure in the US, with over 1.0 million procedures annually.
- Indications include unstable angina, acute myocardial infarction, valvular heart disease, and congenital heart disease.
- Hemodynamic assessment measures pressures in right/left heart and pulmonary artery, with normal ranges detailed in Table 249-2.
- Coronary angiography identifies stenoses using percent stenosis (visual estimation) and fractional flow reserve (FFR <0.80 indicates significant stenosis).
- Radial artery access is preferred to reduce bleeding complications, with post-procedure bed rest minimized using closure devices.
1. DEFINITION & OVERVIEW¶
Diagnostic cardiac catheterization and coronary angiography are the gold standard for evaluating cardiac anatomy and physiology. First demonstrated by Forssmann in 1929, the technique involves percutaneous catheterization with contrast injection to visualize coronary arteries and cardiac chambers. Coronary angiography provides detailed anatomical assessment of coronary arteries and hemodynamic evaluation of valvular and myocardial function.
Table 249-1 Indications for Cardiac Catheterization and Coronary Angiography¶
| Indication |
|---|
| Asymptomatic or Symptomatic Coronary Artery Disease |
| High risk for adverse outcome based on noninvasive testing |
| Sudden cardiac death |
| Sustained (>30 s) monomorphic ventricular tachycardia |
| Nonsustained (<30 s) polymorphic ventricular tachycardia |
| Symptomatic Coronary Artery Disease |
| Canadian Cardiology Society Class II, III, or IV stable angina on medical therapy |
| Acute coronary syndrome (unstable angina and non-ST-segment elevation myocardial infarction) |
| Chest-pain syndrome of unclear etiology and equivocal findings on noninvasive tests |
| Acute Myocardial Infarction |
| Indication |
|---|
| Reperfusion with primary percutaneous coronary intervention |
| Persistent or recurrent ischemia |
| Pulmonary edema and/or reduced ejection fraction |
| Cardiogenic shock or hemodynamic instability |
| Risk stratification or positive stress test after acute myocardial infarction |
| Mechanical complications—mitral regurgitation, ventricular septal defect |
| Valvular Heart Disease |
| Suspected severe valve disease in symptomatic patients—dyspnea, angina, heart failure, syncope |
| Infective endocarditis with need for cardiac surgery |
| Asymptomatic patients with aortic regurgitation and cardiac enlargement or fl ejection fraction |
| Prior to cardiac surgery or transcatheter aortic valve replacement or other percutaneous valvular interventions in patients with suspected coronary artery disease |
| Congestive Heart Failure |
| New-onset angina or suspected undiagnosed coronary artery disease |
| New-onset cardiomyopathy of uncertain cause or suspected to be due to coronary artery disease |
| Congenital Heart Disease |
| Prior to surgical correction or percutaneous interventions, when symptoms or noninvasive testing suggests coronary disease |
| Suspicion for congenital coronary anomalies |
| Pericardial Disease |
| Symptomatic patients with suspected cardiac tamponade or constrictive pericarditis |
| Cardiac Transplantation |
| Preoperative and postsurgical evaluation |
| Other Conditions |
| Hypertrophic cardiomyopathy with angina |
| Diseases of the aorta when knowledge of coronary artery involvement is necessary for management |
| Pulmonary hypertension |
| Unexplained dyspnea |
1.1 Historical Context¶
Forssmann first demonstrated cardiac catheterization in 1929. Cournand and Richards applied it clinically in the 1940s, earning the 1956 Nobel Prize. Sones inadvertently performed the first coronary angiography in 1958, leading to widespread use of selective coronary catheters.
1.2 Diagnostic Role¶
Assesses coronary artery disease severity, evaluates valvular function, measures hemodynamic parameters, and identifies intracardiac shunts. Used for risk stratification, revascularization planning, and post-MI evaluation.
2. EPIDEMIOLOGY¶
Cardiac catheterization is the second most common operative procedure in the US, with over 1.0 million procedures annually. It is used in 10-20% of patients with chest pain syndrome and is the gold standard for evaluating coronary artery disease severity. The procedure is more common in older adults, with risk factors including diabetes, chronic kidney disease, and prior coronary artery disease.
3. ETIOLOGY & PATHOPHYSIOLOGY¶
Coronary artery disease (CAD) is the primary etiology requiring catheterization. Pathophysiology involves atherosclerosis, thrombosis, and plaque rupture. Hemodynamic abnormalities include pressure gradients across stenotic valves (aortic stenosis: systolic gradient; mitral stenosis: diastolic gradient). Intracardiac shunts (e.g., ASD, VSD) cause abnormal oxygen saturation gradients.
4. CLINICAL FEATURES¶
Symptoms include chest pain, dyspnea, syncope, and signs of heart failure. Physical findings may include murmurs (aortic stenosis), peripheral edema (congestive heart failure), and jugular venous distension. Complications include contrast-induced nephropathy, vascular injury, and procedural bleeding.
5. DIFFERENTIAL DIAGNOSIS¶
Differential diagnoses include unstable angina, myocardial infarction, valvular heart disease, pericardial disease, and intracardiac shunts. Key distinguishing features include oxygen saturation gradients, hemodynamic profiles, and coronary angiographic findings.
6. INVESTIGATIONS & DIAGNOSIS¶
Diagnostic criteria include abnormal coronary angiograms, hemodynamic profiles (e.g., elevated pulmonary artery pressures), and oxygen saturation gradients. Noninvasive tests (ECG, echocardiography, stress testing) guide indications. Coronary angiography is the gold standard for visualizing stenoses and assessing coronary anatomy.
Table 249-2 Normal Values for Hemodynamic Measurements¶
| Parameter | Normal Range (mmHg) |
|---|---|
| Right atrium (mean) | 1–8 |
| Right ventricle peak systolic/end diastolic | 15–30/1–8 |
| Pulmonary artery peak systolic/end diastolic | 15–30/4–12 |
| Pulmonary artery mean | 9–19 |
| Pulmonary capillary wedge (mean) | 4–12 |
| Left atrium (mean) | 4–12 |
| Left ventricle peak systolic/end diastolic | 90–129/5–12 |
| Aorta peak systolic/end diastolic | 90–129/60–79 |
| Aorta mean | 70–100 |
| Systemic vascular resistance | 900–1400 [dyn-s]/cm5 |
| Pulmonary vascular resistance | 40–120 [dyn-s]/cm5 |
| Oxygen Consumption Index | 115–140 [L-min]/m2 |
| Arteriovenous oxygen difference | 3.5–4.8 vol % |
| Parameter | Normal Range (mmHg) |
|---|---|
| Cardiac index | 2.8–4.2 [L-min]/m2 |
7. MANAGEMENT & TREATMENT¶
Pre-procedure management includes antiplatelet therapy (aspirin, P2Y inhibitors), anticoagulation (heparin), and hydration. Post-procedure care involves vascular closure (radial/femoral access), monitoring for bleeding, and managing contrast-induced nephropathy. Interventional options include coronary stenting and percutaneous valve repair.
8. PROGNOSIS & COMPLICATIONS¶
Prognosis depends on severity of coronary disease and hemodynamic stability. Complications include contrast-induced nephropathy (2–7%), vascular injury (1.5–2%), bleeding (0.3–0.7% requiring dialysis), and procedural mortality (1.4% for elective, higher for emergent cases).
Table 249-3 Hemodynamic Findings in Tamponade, Constrictive Pericarditis, and Restrictive Cardiomyopathy¶
| Parameter | Cardiac Tamponade | Constrictive Pericarditis | Restrictive Cardiomyopathy |
|---|---|---|---|
| Pericardial pressure | › | › | Normal |
| Right atrium pressure | › | › | Normal |
| Right atrium waveform | Prominent 'x' descent, diminished or absent 'y' descent | Prominent 'x' descent, prominent 'y' descent | Prominent 'y' descent |
| Right ventricle systolic pressure | <50 mmHg | <50 mmHg | <50 mmHg |
| Right ventricle end-diastolic pressure | >1/3 right ventricular systolic pressure | >1/3 right ventricular systolic pressure | <1/3 right ventricular systolic pressure |
| Right ventricle–left ventricle systolic pressure relationship with inspiration | Discordant | Discordant | Concordant |
9. SPECIAL CONSIDERATIONS¶
Special considerations include anticoagulation management (avoid metformin pre/post-contrast), radial vs femoral access risks, and contrast-induced nephropathy prevention. Patients with renal insufficiency require closer monitoring. Pregnancy and pediatric patients require adjusted protocols.
10. KEY POINTS & CLINICAL PEARLS¶
- Cardiac catheterization is the gold standard for coronary artery disease evaluation.
- Radial access reduces bleeding risk and shortens recovery time.
- FFR <0.80 indicates hemodynamically significant stenosis.
- Contrast-induced nephropathy is prevented by hydration and avoiding nephrotoxic agents.
- Hemodynamic profiles distinguish tamponade, constrictive pericarditis, and restrictive cardiomyopathy.