The nurse knows which of the following types of angina is most closely related with an impending myocardial infarction (MI)?
Unstable
Variant
Chronic stable
Nocturnal
The Correct Answer is A
A) Unstable:
Unstable angina is the type of angina most closely related to an impending myocardial infarction (MI). It is characterized by unpredictable chest pain that occurs at rest or with minimal exertion, or that increases in severity or frequency. Unstable angina represents a medical emergency and can progress to an MI if not promptly treated. It occurs when there is increased myocardial oxygen demand and a partially occluded coronary artery, often due to a ruptured atherosclerotic plaque.
B) Variant (Prinzmetal's) angina:
Variant angina, also known as Prinzmetal's angina, is caused by a spasm of the coronary artery, which temporarily narrows or obstructs blood flow. Although it can be severe and may occur at rest, it is typically transient and is not directly related to the development of an MI. Variant angina usually responds to medications such as nitrates or calcium channel blockers, and while it can be dangerous, it is not the most likely type of angina associated with a myocardial infarction.
C) Chronic stable angina:
Chronic stable angina occurs with predictable patterns, typically with exertion or stress, and resolves with rest or nitroglycerin. It does not usually indicate an impending MI, as it is a chronic condition caused by atherosclerosis that limits the heart's blood supply under stress. While chronic stable angina increases the risk of MI over time, it is not directly associated with an imminent heart attack.
D) Nocturnal angina:
Nocturnal angina refers to chest pain that occurs during the night or early morning hours, often during sleep. It may be associated with sleep apnea, GERD, or increased sympathetic tone during sleep. This type of angina is less commonly linked to an impending MI compared to unstable angina, although it should still be evaluated for any underlying cardiovascular issues.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) Prolonged prothrombin time (PT):
A prolonged PT is a sign of impaired coagulation, which is common in DIC as the clotting factors are consumed. In DIC, both clotting and bleeding occur, leading to prolonged PT. Therefore, a prolonged PT does not reflect a positive outcome. A positive outcome would show normalization or improvement of the clotting profile.
B) Elevated fibrinogen level:
Fibrinogen is often decreased in DIC because it is consumed in the process of forming clots. An elevated fibrinogen level would not indicate a positive outcome in DIC. Instead, fibrinogen levels typically fall in DIC due to widespread clotting activity. A positive outcome would involve a normalization or increase in fibrinogen levels as the condition improves.
C) Decreased platelet count:
Platelet count typically decreases in DIC because platelets are used up in the formation of clots, leading to thrombocytopenia. A decreased platelet count reflects ongoing consumption of platelets and would not be a positive indicator of improvement. In a positive outcome, the platelet count would increase toward normal levels.
D) Decreased D-dimer level:
D-dimer is a product of fibrin degradation and is elevated in conditions like DIC, where abnormal clotting and fibrinolysis are occurring. A decreased D-dimer level indicates that the coagulation process is resolving, and fibrin degradation is returning to normal, reflecting a positive outcome. Monitoring the D-dimer level is a key indicator of improvement in DIC.
Correct Answer is C
Explanation
A) Equal but sluggishly reactive pupils:
Pupillary changes, including sluggish or unequal responses, are significant signs of increasing intracranial pressure (ICP) and should be monitored closely. However, altered level of consciousness (LOC) is typically one of the earliest signs of increased ICP. The response of the pupils to light can become abnormal later, once pressure increases within the brain, particularly when brainstem function is impacted.
B) Widening pulse pressure:
A widening pulse pressure is part of Cushing’s triad, which is a late sign of increased ICP. Cushing’s triad consists of hypertension, bradycardia, and irregular respirations (often seen as Cheyne-Stokes). These changes occur in the later stages of elevated ICP as a compensatory mechanism to preserve cerebral perfusion. While this is an important finding, altered LOC would precede the development of Cushing’s triad.
C) Altered level of consciousness:
Altered level of consciousness (LOC) is typically the first and most sensitive indicator of increased ICP. As pressure increases within the skull, it compresses brain tissue and affects the brainstem, which controls basic functions like consciousness. LOC can range from mild confusion and disorientation to full loss of consciousness or coma, depending on the severity of the ICP increase.
D) Tachycardia and hypotension:
Tachycardia and hypotension can be associated with shock or other conditions, but they are not characteristic of early increased ICP. In fact, as ICP rises, the body typically responds with bradycardia (slower heart rate) and hypertension (increased blood pressure), which are part of the compensatory mechanisms.
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