81. The anatomic electrophysiologic basis of AV node re-entry tachycardia is dual AV node conduction pathways. AV node re-entry tachycardia is most likely to occur with which of the following electrophysiologic aberrations?
A. Proximal antegrade block in the slow conduction pathway.
B. Proximal retrograde block in the slow conduction pathway.
C. Proximal antegrade block in the fast conduction pathway.
D. Proximal retrograde block in the fast conduction pathway.
Ans: C
82. Match the four surgical procedures that have been developed for the treatment of atrial fibrillation with the major detrimental sequela(e) of atrial fibrillation that each corrects.
A. His bundle ablation.
B. Left atrial isolation procedure.
C. Corridor procedure.
D. Maze procedure.
1. Patient's sensation of irregular heart rhythm.
2. Hemodynamic compromise because of loss of AV synchrony.
3. Increased vulnerability to thromboembolism.
Ans: A-1. B-1,2. C-1. D1,2,3
83. All of the following statements about nonischemic ventricular tachyarrhythmias are true except:
A. They usually occur in the right ventricle.
B. They are usually associated with a left bundle branch block pattern during the tachycardia.
C. They are usually more refractory to medical therapy than ischemic ventricular tachyarrhythmias.
D. They usually occur as a result of automaticity rather than re-entry.
Ans: D
DISCUSSION: Nonischemic ventricular tachyarrhythmias usually occur in the right ventricle, and as a result the ECG shows a left bundle branch block\96type pattern during ventricular tachycardia. These arrhythmias are notoriously refractory to medical therapy and they occur almost exclusively on a re-entrant basis.
84. Which of the following statements about left atrial myxoma are true?
A. This lesion, by site and histology, is the most common primary cardiac tumor.
B. It is best diagnosed by cardiac catheterization and angiography.
C. The sysmptom complex can mimic collagen vascular disease.
D. It has an intracavitary growth pattern.
E. It has a multicentric origin in the chamber wall.
Ans: A,C,D
85. Which of the following statements about malignant cardiac tumors are true?
A. Sarcomas are the most frequent primary malignancy.
B. Metastatic tumors are usually asymptomatic.
C. Adjuvant chemotherapy and irradiation are efficacious in prolonging survival.
D. Intra-atrial extension of renal neoplasms is a contraindication for surgical resection.
E. Constrictive physiology is an indication for operation.
Ans: A,B
86. Disadvantages of temporary pacing through skin electrodes applied to the anterior chest wall include all of the following except:
A. Skin burns.
B. Painful chest wall muscle contractions.
C. Ventricular fibrillation.
D. Inability to pace.
Ans: C
87. In adults the most common cause of acquired complete heart block is:
A. Ischemic heart disease.
B. Sclerodegenerative disease.
C. Traumatic injury.
D. Cardiomegaly.
Ans: B
88. The most common indication for permanent pacing is:
A. Complete heart block.
B. Second-degree AV block.
C. Chronic bifascicular block.
D. Sick sinus syndrome.
Ans: D
89. Decreasing pacemaker electrode tip size results in:
A. Lower pacing thresholds.
B. Improved electrogram sensing.
C. Decreased battery life.
D. Less patient discomfort.
Ans: A
90. At the time of ventricular pacemaker implantation, lead resistance is determined at a voltage near that of the pacemaker's output. The calculated resistance at 5 volts should range from:
A. 10 to 100 ohms.
B. 125 to 250 ohms.
C. 300 to 800 ohms.
D. 1000 to 1500 ohms.
Ans: C
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A. Proximal antegrade block in the slow conduction pathway.
B. Proximal retrograde block in the slow conduction pathway.
C. Proximal antegrade block in the fast conduction pathway.
D. Proximal retrograde block in the fast conduction pathway.
Ans: C
82. Match the four surgical procedures that have been developed for the treatment of atrial fibrillation with the major detrimental sequela(e) of atrial fibrillation that each corrects.
A. His bundle ablation.
B. Left atrial isolation procedure.
C. Corridor procedure.
D. Maze procedure.
1. Patient's sensation of irregular heart rhythm.
2. Hemodynamic compromise because of loss of AV synchrony.
3. Increased vulnerability to thromboembolism.
Ans: A-1. B-1,2. C-1. D1,2,3
83. All of the following statements about nonischemic ventricular tachyarrhythmias are true except:
A. They usually occur in the right ventricle.
B. They are usually associated with a left bundle branch block pattern during the tachycardia.
C. They are usually more refractory to medical therapy than ischemic ventricular tachyarrhythmias.
D. They usually occur as a result of automaticity rather than re-entry.
Ans: D
DISCUSSION: Nonischemic ventricular tachyarrhythmias usually occur in the right ventricle, and as a result the ECG shows a left bundle branch block\96type pattern during ventricular tachycardia. These arrhythmias are notoriously refractory to medical therapy and they occur almost exclusively on a re-entrant basis.
84. Which of the following statements about left atrial myxoma are true?
A. This lesion, by site and histology, is the most common primary cardiac tumor.
B. It is best diagnosed by cardiac catheterization and angiography.
C. The sysmptom complex can mimic collagen vascular disease.
D. It has an intracavitary growth pattern.
E. It has a multicentric origin in the chamber wall.
Ans: A,C,D
85. Which of the following statements about malignant cardiac tumors are true?
A. Sarcomas are the most frequent primary malignancy.
B. Metastatic tumors are usually asymptomatic.
C. Adjuvant chemotherapy and irradiation are efficacious in prolonging survival.
D. Intra-atrial extension of renal neoplasms is a contraindication for surgical resection.
E. Constrictive physiology is an indication for operation.
Ans: A,B
86. Disadvantages of temporary pacing through skin electrodes applied to the anterior chest wall include all of the following except:
A. Skin burns.
B. Painful chest wall muscle contractions.
C. Ventricular fibrillation.
D. Inability to pace.
Ans: C
87. In adults the most common cause of acquired complete heart block is:
A. Ischemic heart disease.
B. Sclerodegenerative disease.
C. Traumatic injury.
D. Cardiomegaly.
Ans: B
88. The most common indication for permanent pacing is:
A. Complete heart block.
B. Second-degree AV block.
C. Chronic bifascicular block.
D. Sick sinus syndrome.
Ans: D
89. Decreasing pacemaker electrode tip size results in:
A. Lower pacing thresholds.
B. Improved electrogram sensing.
C. Decreased battery life.
D. Less patient discomfort.
Ans: A
90. At the time of ventricular pacemaker implantation, lead resistance is determined at a voltage near that of the pacemaker's output. The calculated resistance at 5 volts should range from:
A. 10 to 100 ohms.
B. 125 to 250 ohms.
C. 300 to 800 ohms.
D. 1000 to 1500 ohms.
Ans: C
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