Chapter 49. Alcohol Septal Ablation in Drug-Refractory Obstructive Hypertrophic Cardiomyopathy
What are the prevalence of hypertrophic cardiomyopathy (HCM) in the general population and the number of Americans affected?
A. 1 in 10,000; 35,000 Americans affected
B. 1 in 5000; 70,000 Americans affected
C. 1 in 1000; 350,000 Americans affected
D. 1 in 500; 700,000 Americans affected
Which statement most accurately characterizes the occurrence of left ventricular outflow tract (LVOT) obstruction (gradient >30 mm Hg) in patients with HCM?
A. 9 in 10 have resting or provoked obstruction
B. 6 in 10 have resting or provoked obstruction
C. 3 in 10 have resting or provoked obstruction
D. 1 in 10 have resting or provoked obstruction
What is the most useful method of confirming a diagnosis of HCM?
E. Magnetic resonance imaging
Which statement most accurately characterizes the comparison of surgical myectomy and alcohol septal ablation (ASA) in treatment of patients with drug-refractory symptoms and obstruction?
A. Higher in-hospital mortality with myectomy; similar 1-year mortality
B. Similar in-hospital and 1-year mortality
C. Higher in-hospital and 1-year mortality with ASA
D. Higher in-hospital and 1-year mortality with myectomy
Which of the following most accurately describes outcomes of ASA?
A. Right bundle branch block in a majority
B. Left bundle branch block in one-third of patients
C. Transient complete heart block in 70%
D. Transient complete heart block in 20%