Cardiac Catheterization of Left Heart
- Author: Roger B Olade, MD, MPH; Chief Editor: Karlheinz Peter, MD, PhD more...
Although the technique and accuracy of noninvasive testing continue to improve, cardiac catheterization (see the image below) remains the standard for the evaluation of hemodynamics. Cardiac catheterization helps provide not only intracardiac pressure measurements but also measurements of oxygen saturation and cardiac output (see the Cardiac Output calculator). Hemodynamic measurements usually are coupled with left ventriculography for the evaluation of left ventricular function and coronary angiography.
Coronary angiography remains the criterion standard for diagnosing coronary artery disease (CAD) and is the primary method used to help delineate coronary anatomy. In addition to defining the site, severity, and morphology of lesions, coronary angiography helps provide a qualitative assessment of coronary blood flow and helps identify collateral vessels.
Correlation of the findings from coronary angiography with those from left ventriculography permits identification of potentially viable areas of the myocardium that may benefit from a revascularization procedure. Left ventricular function can be further evaluated during stress by using atrial pacing, dynamic exercise, or pharmacologic agents.
Cardiac catheterization is undertaken for the diagnosis of a variety of cardiac diseases. As with any invasive procedure that is associated with important complications, the decision to recommend cardiac catheterization must be based on a careful evaluation of the risks and benefits to the patient.
Indications for cardiac catheterization are as follows:
Identification of the extent and severity of CAD and evaluation of left ventricular function
Assessment of the severity of valvular or myocardial disorders (eg, aortic stenosis or insufficiency, mitral stenosis or insufficiency, and various cardiomyopathies) to determine the need for surgical correction
Collection of data to confirm and complement noninvasive studies
Determination of the presence of CAD in patients with confusing clinical presentations or chest pain of uncertain origin
Many patients undergo cardiac catheterization before noncardiac surgery, even though it is not routinely indicated. In a report from the National Cardiovascular Data Registry CathPCI Registry, most of the patients undergoing diagnostic catheterization before noncardiac surgery were found to be asymptomatic. Discovery of obstructive CAD was common, and revascularization was recommended in nearly half of these patients.
With the exception of patient refusal, there are no absolute contraindications for cardiac catheterization. Clearly, the risk-to-benefit ratio must be considered: Any procedure that is associated with some degree of risk should be contraindicated if the information derived from it will be of no benefit to the patient.
Relative contraindications are as follows:
Severe uncontrolled hypertension
Active gastrointestinal bleeding
Allergy to radiographic contrast
Acute renal failure
Uncompensated congestive failure (so that the patient cannot lie flat)
Unexplained febrile illness or untreated active infection
Electrolyte abnormalities (eg, hypokalemia)
Note that many of these factors can be corrected before the procedure, which lowers the risk. Preprocedural risk factor correction always should be considered unless the procedure is being performed in an emergency situation.
Absolute contraindications to radial artery access for left-heart cardiac catheterization include the following:
Patients who lack adequate collateral circulation
Patients with abnormal results from Allen test or plethysmography
Patients who may require an intra-aortic balloon pump
Patients who may require devices that are not compatible with sheaths smaller than 7 French
Patients with known upper-extremity vascular disease
Relative contraindications to radial artery access for left-heart cardiac catheterization include the following:
Patients with chronic kidney disease who may need an arteriovenous fistula in the future
Patients with Raynaud syndrome
Women with short stature and weak radial pulses
Patients with known severe innominate-subclavian artery disease
Patients with known internal mammary grafts contralateral to the site of entry
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