Which assessment finding is commonly associated with mitral stenosis?
Pulsus paradoxus with wide pulse pressure
Rumbling decrescendo diastolic murmur heard best over the cardiac apex and radiating to the left axilla
Harsh systolic ejection murmur along the left sternal border
Loud holosystolic murmur at the apex
The Correct Answer is B
A. Pulsus paradoxus is a physical finding characterized by a significant drop in systolic blood pressure during inspiration, typically seen in cardiac tamponade or severe asthma. Mitral stenosis involves a fixed obstruction to left ventricular filling rather than the exaggerated respiratory pressure changes seen in pericardial disease. It does not typically present with a wide pulse pressure.
B. A rumbling decrescendo diastolic murmur is the classic auscultatory finding for mitral stenosis, occurring as blood is forced through a narrowed mitral valve during ventricular filling. It is best heard at the apex with the patient in the left lateral decubitus position. This low-pitched sound reflects the turbulent flow and pressure gradient between the left atrium and ventricle.
C. A harsh systolic ejection murmur heard along the left sternal border is most characteristic of aortic stenosis or hypertrophic cardiomyopathy. These conditions involve obstruction of the outflow tract during ventricular contraction, rather than an inflow obstruction during diastole. This finding is temporally and physiologically distinct from the diastolic filling sounds produced by a stenotic mitral valve.
D. A loud holosystolic murmur at the apex typically indicates mitral regurgitation, where blood flows backward into the left atrium throughout the entirety of ventricular systole. In contrast, mitral stenosis produces a sound during the diastolic phase of the cardiac cycle. A holosystolic murmur represents a different valvular pathology where the valve fails to close properly during contraction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Rheumatoid arthritis primarily involves Type 3 hypersensitivity, where immune complexes deposit in the synovial joints to trigger inflammation. While T-cells are present, the formation of rheumatoid factor complexes is a central pathological feature. It represents a systemic autoimmune response characterized by both antibody-mediated and cell-mediated damage, but Type 3 is highly prominent.
B. Systemic lupus erythematosus (SLE) is the prototypical Type 3 hypersensitivity disorder involving the systemic deposition of antigen-antibody complexes. These complexes circulate and lodge in various tissues, such as the kidneys and skin, leading to complement activation and tissue destruction. It is not primarily defined by the delayed, cell-mediated mechanisms of Type IV hypersensitivity.
C. Multiple sclerosis is an autoimmune disorder driven by Type IV hypersensitivity, where autoreactive T-lymphocytes cross the blood-brain barrier to attack the myelin sheath. These T-cells release cytokines that activate macrophages, leading to the destruction of oligodendrocytes in the central nervous system. This delayed, cell-mediated immune response results in the characteristic plaque formation and neurodegeneration.
D. Graves’ disease is a Type 2 hypersensitivity reaction where autoantibodies specifically target and stimulate the thyroid-stimulating hormone (TSH) receptor. This leads to the autonomous overproduction of thyroid hormones, resulting in hyperthyroidism. The pathology is caused by direct antibody-receptor interaction rather than the sensitized T-cell activity that characterizes Type IV hypersensitivity.
Correct Answer is C
Explanation
A. Low serum ferritin levels are the definitive marker for iron deficiency anemia, indicating depleted intracellular iron stores. In anemia of chronic disease, ferritin levels are typically normal or elevated as iron is sequestered within macrophages. Low ferritin would indicate a nutritional deficit rather than the inflammatory blockade typical of ACD.
B. High erythropoietin levels are a standard physiologic response to anemia in patients with healthy marrow and renal function. However, in anemia of chronic disease, inflammatory cytokines such as interleukin 6 often blunt the production of erythropoietin. Finding high levels is not a characteristic or early diagnostic indicator for this inflammatory condition.
C. Failure to respond to conventional iron replacement therapy is frequently the initial clinical sign of anemia of chronic disease. This occurs because inflammatory mediators increase hepcidin production, which inhibits the export of iron from cells into the plasma. Consequently, administered iron remains trapped in storage and cannot be utilized for erythropoiesis.
D. Microcytic/hypochromic red blood cells are characteristic of advanced iron deficiency or thasselemia where hemoglobin synthesis is severely limited. Anemia of chronic disease usually presents initially as a normocytic, normochromic anemia. Morphological changes in the red cells typically occur only after prolonged exposure to the chronic inflammatory state.
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