Question #1
CARDIOLOGY
Mitral valve regurgitation means that blood flows backward through the mitral valve. Into which of the following structures does blood flow during mitral valve regurgitation?
Answer:
The correct answer is (A)
The mitral valve is the valve between the left atrium and the left ventricle. During systole, this valve ordinarily prevents backflow of blood from the left ventricle into the left atrium. This is not the case in mitral valve regurgitation.
Question #2
CARDIOLOGY
During myocardial contraction, which of the following is true?
Answer:
The correct answer is (B)
When myocytes are polarized just prior to contraction, the resting potential is approximately -90 mV. During contraction, the myocytes depolarize, which means the potential becomes approximately 0 mV. This means that the cell potential has become more positive.
Question #3
CARDIOLOGY
A 12-lead ECG reveals a QRS above the baseline in lead I and below the baseline in lead aVF. It also shows an RSRʹ pattern in lead V1. What is the most likely explanation for these findings?
Answer:
The correct answer is (B)
The QRS up in lead I and down in lead aVF indicates a left axis deviation and the RSRʹ pattern in lead V1 indicates a right bundle branch block./p>
Question #4
CARDIOLOGY
Your patient is in cardiac arrest and the rhythm shows a pulseless 3rd-degree heart block at a rate of 30. All of the following are appropriate treatments for this patient EXCEPT:
Answer:
The correct answer is (C)
Although the rhythm is a bradycardic rhythm, because there is no pulse, pacing is not an appropriate treatment. Once pulses return, pacing can then be an option.
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