A patient is admitted to the hospital for a splenectomy. The nurse understands that the health-care provider prescribes an injection of vitamin K prior to surgery for which action?
To reduce risk of infection
To dry gastric secretions
To promote postoperative healing
To correct a clotting problem
The Correct Answer is D
A. While vitamin K plays a role in immune function, its administration prior to surgery primarily aims to correct potential clotting abnormalities rather than prevent infection.
B. Vitamin K does not affect gastric secretions. Its role in this context is unrelated to gastric function.
C. While vitamin K is involved in various physiological processes, its administration prior to surgery is primarily aimed at preventing bleeding complications by ensuring adequate clotting factor synthesis.
D. Vitamin K is essential for the synthesis of clotting factors in the liver.
Administering vitamin K prior to surgery helps ensure adequate levels of clotting factors, reducing the risk of bleeding during and after the procedure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Three or more consecutive premature ventricular contractions (PVCs) on an ECG tracing is indicative of ventricular tachycardia, a serious arrhythmia that requires prompt intervention.
B. Bigeminy refers to a pattern of every other beat being a PVC, not necessarily three or more consecutive PVCs.
C. Ventricular fibrillation is characterized by chaotic, disorganized ventricular activity on the ECG and is not defined by the presence of consecutive PVCs.
D. Trigeminy refers to a pattern of every third beat being a PVC, not necessarily three or more consecutive PVCs.
Correct Answer is A
Explanation
A. The P wave on an ECG represents atrial depolarization, which occurs as the electrical impulse originates in the sinoatrial (SA) node and spreads through the atria, initiating atrial contraction.
B. Atrial repolarization typically occurs during the QRS complex and is not represented by the P wave. Atrial repolarization is masked by the larger QRS complex.
C. Ventricular depolarization is represented by the QRS complex on an ECG, as the electrical impulse spreads through the ventricles, leading to ventricular contraction.
D. Ventricular repolarization typically occurs during the T wave and is not represented by the P wave. Ventricular repolarization involves the recovery of ventricular muscle cells after contraction.
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