A patient arrives at the emergency department with reports of pain in the right upper quadrant of the abdomen after eating a high-fat meal.
The patient states that the pain radiates to her back.
No changes are noted on the electrocardiogram (ECG) and cardiac enzymes are normal.
The nurse suspects this patient is experiencing:
a myocardial infarction.
cholecystitis.
gastroesophageal reflux.
appendicitis.
The Correct Answer is B
Choice A rationale
Myocardial infarction involves ischemia and necrosis of the heart muscle, often presenting with chest pain that may radiate to the left arm or jaw. While epigastric pain can occur, the negative electrocardiogram and normal cardiac enzymes (such as Troponin I < 0.04 ng/mL) significantly lower the probability of a cardiac event. The specific trigger of a high-fat meal and radiation to the back is much more characteristic of gallbladder disease than coronary occlusion.
Choice B rationale
Cholecystitis is inflammation of the gallbladder, often caused by gallstones obstructing the cystic duct. High-fat meals trigger the release of cholecystokinin, which causes the gallbladder to contract to release bile. If obstructed, this contraction causes sharp pain in the right upper quadrant that frequently radiates to the right scapula or back. This classic presentation, combined with the lack of cardiac markers and the dietary trigger, strongly suggests the gallbladder is the source of the pain.
Choice C rationale
Gastroesophageal reflux occurs when stomach acid backs up into the esophagus, causing a burning sensation in the chest known as heartburn. While it is often triggered by eating, it typically causes retrosternal burning rather than sharp right upper quadrant pain that radiates to the back. Reflux does not usually present with the severity and specific radiation pattern seen in biliary colic or cholecystitis, making it a less likely primary diagnosis for this specific patient.
Choice D rationale
Appendicitis is the inflammation of the vermiform appendix, typically presenting with periumbilical pain that later localizes to the right lower quadrant at McBurney's point. While it can cause nausea and vomiting, the pain is not usually triggered specifically by high-fat meals, nor does it typically radiate to the back from the right upper quadrant. The anatomical location of the pain in this scenario is too high for a standard presentation of acute appendicitis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
This sequence is incorrect because it places the Bundle of His before the AV node. The electrical impulse must pass through the AV node to allow for a physiological delay, which ensures the ventricles fill with blood from the atria before contracting. The Bundle of His receives the signal from the AV node. Moving from the Bundle of His back to the AV node would represent a retrograde or abnormal conduction pathway, which is not the standard physiological order.
Choice B rationale
The normal cardiac conduction starts at the SA node, the primary pacemaker located in the right atrium. The impulse travels to the AV node, where it is briefly delayed. It then moves to the Bundle of His, which splits into the right and left bundle branches. Finally, it reaches the Purkinje fibers, which distribute the electrical charge throughout the ventricular myocardium to trigger a coordinated contraction. This sequence ensures efficient blood flow from atria to ventricles.
Choice C rationale
This sequence incorrectly identifies the AV node as the starting point. While the AV node can act as a secondary pacemaker if the SA node fails, the standard physiological conduction system begins at the SA node. The SA node has the highest inherent firing rate, typically 60 to 100 beats per minute, which suppresses other potential pacemakers. Starting at the AV node would result in a junctional rhythm, which is a slower heart rate than a normal sinus rhythm.
Choice D rationale
This sequence represents the exact reverse of the normal conduction pathway. In a healthy heart, electricity does not move from the ventricles upward to the atria. Starting at the Purkinje fibers would mean the impulse originated in the ventricular tissue, which is characteristic of ventricular escape rhythms or premature ventricular contractions. Such a pathway would be highly inefficient and signifies a significant pathological state or a complete heart block where the primary pacemakers have failed.
Correct Answer is C
Explanation
Choice A rationale
Purkinje fibers are the terminal branches of the cardiac conduction system located within the ventricular walls. They rapidly conduct electrical impulses to the myocardial cells to trigger ventricular contraction. While they possess inherent automaticity and can act as a tertiary pacemaker if other nodes fail, their intrinsic rate is very slow, typically 20 to 40 beats per minute. They are not the primary pacemaker under normal physiological conditions but rather the final stage of impulse distribution.
Choice B rationale
The Bundle of His, or the atrioventricular bundle, receives electrical impulses from the AV node and transmits them toward the apex of the heart via the bundle branches. It serves as a critical bridge for electrical conduction between the atria and the ventricles. Although it has a secondary pacemaker ability with an inherent rate of 40 to 60 beats per minute, it only takes over if the SA node fails to function correctly or if conduction is blocked.
Choice C rationale
The sinoatrial node, located in the right atrium, is known as the natural pacemaker of the heart. It initiates the electrical impulses that set the rhythm and rate of the cardiac cycle. In a healthy adult, the SA node fires at an intrinsic rate of 60 to 100 times per minute. This impulse spreads through the atria, causing them to contract, and then travels to the rest of the conduction system to coordinate a synchronized heartbeat.
Choice D rationale
The atrioventricular node is situated at the junction between the atria and ventricles. Its primary role is to delay the electrical impulse briefly, allowing the atria to finish contracting and the ventricles to fill with blood before they contract. The AV node can act as a secondary pacemaker with a rate of 40 to 60 beats per minute if the SA node is nonfunctional. However, it is not the primary site where the heart's normal rhythm is generated.
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