QRS complexes that measure 0.12 seconds or greater and a heart rate between 20 and 40 bpm indicate that the impulses causing ventricular depolarization are coming from which location?
A. SA node
B. AV node
C. Interatrial pathways
D. Purkinje fibers
Answer: D
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On the scene of a drug-related emergency, the 22-year-old patient tells you that he has been taking amphetamines because he likes the way that they make him feel. Over the past two days, he has been taking more and more, and today he feels as though his heart is racing. He also tells you that he recognizes he has a problem and wants to get help. When you are assessing the patient, which sign or symptom would provide further evidence that the patient has been abusing amphetamines?
A) Increased blood pressure B) Auditory hallucinations C) Constricted pupils D) Fatigue and prolonged sleep
You are analyzing a 12-lead ECG for the presence of left ventricular hypertrophy. After measuring carefully, you determine that the QS measurement is 12 mm and the R wave measurement is 20 mm. What does this patient have?
A. Advanced left ventricular hypertrophy B. No clinical sign of hypertrophy C. Minimal left ventricular hypertrophy D. Both left and right ventricular hypertrophy
Who pioneered open-heart surgery, and with two electronic engineers, perfected a pacemaker?
A) Charles Hufnagel B) Jonas Salk C) C. Walton Lillehei D) Ake Senning
A matrix of size 2048x1536 would have _______ pixels.
a. 512 b. 3584 c. 3,145,728 d. none of the above