The nurse is teaching a beginning ECG class to staff nurses. As the nurse begins to discuss the parts of the ECG complex, one of the students asks what the normal order of conduction through the heart is. The correct response would be which of the following?
SA node, AV node, bundle of His, right and left bundle branches, and the Purkinje fibers
SA node, AV node, bundle of His, the Purkinje fibers, and the right and left bundle branches
AV node, SA node, bundle of His, right and left bundle branches, and the Purkinje fibers
SA node, AV node, right and left bundle branches, bundle of His, and the Purkinje fibers
The Correct Answer is A
A. This is the correct sequence of normal electrical conduction through the heart: the impulse originates in the sinoatrial (SA) node, travels to the atrioventricular (AV) node, then to the bundle of His, down the right and left bundle branches, and finally through the Purkinje fibers.
B. This choice places the Purkinje fibers before the bundle branches, which is incorrect.
C. The AV node does not initiate conduction; the SA node is the natural pacemaker of the heart.
D. This sequence incorrectly places the bundle branches before the bundle of His.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Epinephrine – Epinephrine is the first-line treatment for anaphylactic shock. It rapidly reverses airway constriction, hypotension, and swelling by stimulating alpha and beta-adrenergic receptors, leading to bronchodilation, vasoconstriction, and increased cardiac output.
B. Dobutamine – Dobutamine is a positive inotrope used to treat cardiogenic shock and may support cardiac output, but it does not address the airway or allergic component of anaphylaxis.
C. Methylprednisolone – This corticosteroid may be given to reduce inflammation and prevent delayed reactions, but it has a slower onset of action and is not the priority in emergency management.
D. Furosemide – This diuretic is used in fluid overload or pulmonary edema, not in the management of anaphylaxis.
Correct Answer is A
Explanation
A. Hepatomegaly (enlarged liver) is a classic sign of right ventricular failure due to systemic venous congestion.
B. A dry, hacking cough is more commonly associated with left-sided heart failure and pulmonary congestion.
C. Crackles in the lungs result from fluid backing up into the lungs, a hallmark of left-sided heart failure, not right-sided.
D. Dizziness may occur in left-sided failure due to decreased cardiac output and poor cerebral perfusion, but it is not a key feature of right-sided failure.
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