← Recent University of Maryland Medical Center Cases (Part I)
Workout Quiz
5 questions. Answers are graded instantly with expert explanations.
1. Which of the following electrolyte disturbances is most commonly associated with a significantly shortened QT interval on ECG?
Hypokalemia
Hyperkalemia
Hypercalcemia
Hypomagnesemia
2. When analyzing an ECG, you notice what appears to be baseline artifact. Which finding would MOST strongly suggest the artifact is actually atrial flutter waves?
The artifact is irregularly irregular.
The artifact consistently marches out at regular intervals.
The artifact disappears when the patient holds still.
The artifact amplitude varies significantly between leads.
3. What ECG finding best describes Bix Rule, a clue for detecting concealed atrial flutter?
Irregularly irregular QRS intervals
A P wave exactly halfway between two consecutive QRS complexes
Sudden QRS widening followed by narrowing
PR interval gradually increasing before a dropped beat
4. Which of the following ECG features should MOST strongly prompt suspicion of limb lead reversal (particularly left arm/right arm)?
ST elevation isolated to inferior leads
Extreme right axis deviation with negative QRS in Lead I and positive in aVR
Tall, peaked T waves in precordial leads
Prominent U waves in lateral leads
5. The ECG computer interpretation labels a rhythm as "Mobitz type II AV block." Which finding MUST be present to support this diagnosis?
Regularly occurring premature atrial contractions (PACs)
Variable PR intervals preceding conducted beats
Isolated ("lonely") non-conducted P waves at regular intervals
Consistent QT interval shortening
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