EKG
100
A previously healthy 28-year-old man comes to the emergency department because of dizziness and palpitations for 2 days. Prior to the onset of the symptoms, he attended a bachelor party where he lost several drinking games. An ECG is shown. Which of the following is the most likely diagnosis?
(a) Hypertrophic obstructive cardiomyopathy
(b) Premature ventricular contraction
(c) Paroxysmal atrial fibrillation
(d) Brugada syndrome
(e) Ventricular tachycardia
(f) Torsades de pointe
(g) Sick sinus syndrome
(c) Paroxysmal atrial fibrillation
200
Twelve hours after being admitted to the hospital for an inferior wall myocardial infarction, a 65-year-old woman begins to present with dyspnea, dizziness, and syncopal episodes that last a few seconds. Her pulse is 40/min. An ECG is shown. Which of the following is the most likely diagnosis?
(a) First-degree AV block
(b) A-fib
(c) Mobitz type I
(d) Sinus bradycardia
(e) Atrial flutter
(f) Mobitz type II
(g) Third-degree AV block
(g) Third-degree (complete) AV block
300
A 23-year-old man comes to the emergency department because of palpitations, dizziness, and substernal chest pain for three hours. The day prior, he was at a friend’s wedding, where he consumed seven glasses of wine. The patient appears diaphoretic. His pulse is 220/min and blood pressure is 120/84 mm Hg. Based on the patient's findings on electrocardiography, the physician diagnoses atrial fibrillation with rapid ventricular response and administers verapamil for rate control. Ten minutes later, the patient is unresponsive and loses consciousness. Despite resuscitative efforts, the patient dies. Histopathologic examination of the heart at autopsy shows an accessory atrioventricular conduction pathway. Electrocardiography prior to the onset of this patient's symptoms would most likely have shown which of the following findings?
(a) Slurred upstroke of QRS
(b) Cyclic alteration of QRS axis
(c) Pseudo RBBB w/ST elevation in V1-2
(d) Epsilon wave after QRS complex
(e) QT interval prolongation
(a) Slurred QRS upstroke
Shortened PR interval, delta-wave --> WPW syndrome
400
Describe specifically:
Atrial flutter w/3:1 conduction (av block)