Safety of Lexiscan in Patients with Valvular Disease

Classification and Diagnosis

• The American College of Cardiology and American Heart Association classify moderate aortic regurgitation as Stage B progressive aortic regurgitation, characterized by a jet width of 25%-64% of the left ventricular outflow tract, a vena contracta of 0.3-0.6 cm, a regurgitant fraction of 30%-49%, and normal left ventricular function or mild left ventricular dilation 1, 2

Monitoring and Precautions

• Patients with aortic dilatation and aortic regurgitation require careful monitoring of both conditions, as the combination can lead to increased hemodynamic stress on the aortic wall 2, 3
• The European Heart Journal recommends that patients with multiple valve disease undergo echocardiographic assessment before the test to confirm the current severity of valvular regurgitations, assess left ventricular size and function, and evaluate aortic dimensions 3, 4
• The American College of Cardiology suggests that ventricular arrhythmias are a potential risk during regadenoson administration, and resuscitation equipment should be immediately available 2

Alternative Testing

• The American Heart Association recommends considering lower-level exercise stress testing as an alternative to regadenoson if appropriate for the patient's condition 6

Hemodynamic Interactions

• The European Heart Journal notes that combined regurgitant lesions can lead to more severe left ventricular volume overload than single lesions, and the presence of "leaky valves" can affect cardiac output and response to vasodilator stress 4, 5