RN exams cardiovascular practice questions set 14

Correct answer:

The correct answer is A: Baroreflex. The baroreflex is a physiological mechanism that helps regulate blood pressure by responding to changes in pressure. When blood pressure decreases, the baroreceptors detect this change and trigger a sympathetic nervous system (SNS) response, leading to increased heart rate, contractility, and vasoconstriction to raise blood pressure. Conversely, when blood pressure increases, the baroreceptors trigger a parasympathetic (vagal) response, resulting in decreased heart rate and vasodilation to lower blood pressure. Summary of other choices: B: Cheyne-Stokes breathing is a pattern of breathing characterized by periodic waxing and waning of tidal volume. C: Frank-Starling Law describes the relationship between preload and stroke volume, not the response to changes in blood pressure. D: Starling reflex is not a recognized physiological mechanism related to blood pressure regulation.

Correct answer:

The correct answer is B. The patient's presentation with tachypnea, hypoxia, and diffuse interstitial infiltrate on chest x-ray suggests leukostasis syndrome due to hyperleukocytosis. The extremely high WBC count of 285,000/mm3 with myeloblasts indicates acute myeloid leukemia. Leukapheresis or manual exchange transfusion is needed to rapidly reduce the number of leukemic blasts in circulation to prevent complications like tissue hypoxia. Initiation of induction chemotherapy is essential for long-term management of AML. Choice A is incorrect because induction chemotherapy alone may not rapidly reduce the WBC count in cases of leukostasis. Choice C is incorrect as the patient's clinical scenario is not consistent with COVID-19 infection, and convalescent plasma is not indicated for leukostasis. Choice D is incorrect as the patient's symptoms are not typical for pneumococcal pneumonia, and vancomycin is not the initial

Correct answer:

The correct answer is A: Oliguria. Oliguria is the decreased urine output, which is an indicator of inadequate response to Lasix in heart failure. Lasix is a diuretic used to reduce fluid overload in heart failure by promoting diuresis. In this case, a decrease in urine output suggests that the medication is not effectively removing excess fluid. For the other choices: B: Decrease in blood pressure - This could be an expected effect of Lasix as it helps reduce fluid volume and can lead to a decrease in blood pressure. C: Absence of crackles - This indicates reduced pulmonary congestion, which is a desired effect of Lasix in heart failure. D: Polydipsia - Increased thirst (polydipsia) is not directly related to the effectiveness of Lasix in treating heart failure. In summary, the presence of oliguria indicates inadequate response to Lasix, while the decrease in blood pressure, absence of crackles, and polydips

Correct answer:

The correct answer is A because the suppression of marijuana in colonial Jamaica was indeed a way to oppress the Rastafarians, who were seen as a threat to colonial social stability. Rastafarians viewed marijuana (kaya) as a sacrament and a key element of their spiritual practice. Authorities perceived Rastafarians as rebellious and subversive due to their anti-colonial beliefs, hence the crackdown on marijuana. Choice B is incorrect because while Bob Marley was associated with the Rastafarian movement and advocated for Jamaican independence, the question specifically focuses on the symbolic politics of cannabis. Choice C is incorrect as colonial authorities objected to cannabis use across all classes, not just the working class. Choice D is incorrect as the trade union movement in Jamaica did not specifically arise to educate about the harms of cannabis but rather focused on workers' rights and labor issues.

Correct answer:

The correct answer is A because phentolamine is an alpha-adrenergic antagonist that blocks presynaptic alpha2 receptors. By inhibiting these receptors, it increases norepinephrine release, leading to stimulation of unblocked beta receptors on the heart, resulting in tachycardia. This mechanism directly links the action of phentolamine to the observed tachycardia. Choice B (Baroreflex mechanism) is incorrect because phentolamine-induced tachycardia is primarily mediated by the alpha2 receptor antagonism rather than the baroreflex mechanism. Choice C (Direct effect on the heart by stimulation of beta1 receptors) is incorrect because phentolamine does not directly stimulate beta1 receptors on the heart; rather, it indirectly causes cardiac stimulation through enhanced norepinephrine release. Choice D (Inhibition of transmitter reuptake at noradrenergic synapses) is incorrect because phentolamine does not inhibit

Correct answer:

The correct answer is B: Promptly refer the patient for medical assessment. A firm, painless cervical lymph node in an adult without recent infectious diseases raises concerns for potential underlying serious conditions such as malignancy. Referring the patient for medical assessment allows for further evaluation, including physical examination, laboratory tests, and imaging studies if necessary, to determine the cause of the lymphadenopathy. This prompt referral is crucial for timely diagnosis and appropriate management. Summary: A: Calling 911 is not warranted as the patient is stable and does not have an emergency medical condition. C: Facilitating a radiograph may not provide sufficient information for evaluating the lymph node and delays definitive assessment. D: Encouraging the patient to wait and track the lymph node size can lead to delayed diagnosis and potentially worsening of the underlying condition.

Correct answer:

The correct answer is A: Mitral regurgitation. In this condition, the mitral valve fails to close properly, causing blood to flow back into the left atrium during ventricular contraction. This results in decreased forward blood flow and increased volume in the left atrium and ventricle. Mitral regurgitation can lead to symptoms like fatigue, shortness of breath, and heart murmur upon auscultation. Now, let's analyze the other choices: B: Aortic stenosis - This involves narrowing of the aortic valve, obstructing blood flow from the left ventricle to the aorta. C: Tricuspid regurgitation - Involves backward flow of blood from the right ventricle to the right atrium due to a faulty tricuspid valve. D: Pulmonary hypertension - Elevated blood pressure in the pulmonary arteries, usually caused by underlying conditions affecting the lungs or heart. Therefore, the correct answer is A because it specifically describes

Correct answer:

The correct answer is C because it provides a clear and accurate explanation of what a PET scan actually does. It states that PET scans involve an injected substance that shows areas of high brain activity, not electrical activity. This response clarifies the misunderstanding and educates the patient on how PET scans work. Choice A is incorrect because it only compares PET scans to electroconvulsive therapy without addressing the patient's specific concern about electrical jolts. Choice B is incorrect as it only distinguishes between PET scans and electroconvulsive therapy without addressing the patient's misconception about brain activity and electrical jolts. Choice D is incorrect because it inaccurately describes PET scans as showing electrical activity in the form of light bands, which is not how PET scans work. It is essential to provide accurate information to address the patient's concerns effectively.

Correct answer:

The correct answer is C: Akathisia. Akathisia is characterized by restlessness, inability to sit still, and a constant need to move. In this scenario, the client's continual movement and inability to sit still indicate symptoms of akathisia. This side effect is commonly seen with antipsychotic medications. Explanation: 1. Drug-induced parkinsonism (Choice A) presents with symptoms similar to Parkinson's disease, such as tremors, stiffness, and shuffling gait. The client's symptoms do not align with these characteristics. 2. Dystonia (Choice B) is characterized by involuntary muscle contractions causing abnormal movements or postures. The client's symptoms do not match the sudden, sustained muscle contractions seen in dystonia. 3. Akinesia (Choice D) refers to a lack of movement or difficulty initiating movement, which is not consistent with the client's behavior of constant movement and inability to sit still.

Correct answer:

The correct answer is D: RA with excess blasts in transformation. This choice has the poorest prognosis because it represents a progression of RA with excess blasts, indicating a higher percentage of blast cells in the bone marrow. This progression signifies a more aggressive form of the disease with a worse outcome. A: Refractory anemia (RA) is a milder form with a better prognosis compared to the other choices. B: RA with ring sideroblasts is a subtype of RA, and while it may have some adverse features, it generally has a better prognosis than RA with excess blasts. C: RA with excess blasts represents a higher risk group, but it is not as severe as RA with excess blasts in transformation, which indicates a further deterioration of the disease. In summary, D is the correct answer because it signifies the most advanced stage of the disease with the highest risk and poorest prognosis compared to the other choices.