What is the primary role of angiotensin-converting enzyme inhibitors (ACEIs) in the management of chronic kidney disease (CKD)?
Slowing the progression of kidney damage
Providing symptomatic relief of kidney pain
Enhancing diuresis and kidney damage
Reducing blood pressure only
The Correct Answer is A
A. ACE inhibitors play a crucial role in slowing the progression of kidney damage by reducing intraglomerular pressure and decreasing proteinuria. By inhibiting the conversion of angiotensin 1 to angiotensin 2, these medications dilate the efferent arteriole of the nephron. This hemodynamic effect reduces the mechanical stress on the glomerular basement membrane, preserving long-term renal function in CKD.
B. Providing symptomatic relief of kidney pain is not a recognized function of ACE inhibitors, as renal pain is typically treated with analgesics or by addressing the cause of obstruction. ACEIs focus on the physiological and hemodynamic aspects of renal filtration rather than sensory neural pathways. They do not possess analgesic properties for the visceral pain associated with renal pathology.
C. Enhancing diuresis is the primary function of diuretic medications, not ACE inhibitors, which have only a very mild secondary effect on sodium excretion. ACEIs are used to manage the quality of renal filtration and provide nephroprotection rather than simply increasing urine volume. Suggesting they increase kidney damage is scientifically incorrect, as their primary clinical value is preventing such damage.
D. Reducing blood pressure is a significant effect of ACE inhibitors, but it is not their only role in the context of chronic kidney disease. Their unique nephroprotective properties, specifically the reduction of glomerular hyperfiltration and albuminuria, provide benefits beyond systemic blood pressure control. They are frequently prescribed to normotensive patients with proteinuric kidney disease for these specific protective effects.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Expansion of the alveoli occurs during inspiration, but an increase in surface tension would actually resist expansion and promote alveolar collapse. Surfactant naturally decreases surface tension to ensure that the small air sacs can inflate easily. High surface tension is a pathological state that inhibits the effective entry of air into the distal pulmonary structures.
B. Inhalation requires the active contraction of the external intercostal muscles to elevate the ribs and sternum. Relaxation of these muscles and a decrease in ribcage volume are characteristics of expiration, not inspiration. For air to enter, the thoracic volume must increase to create the negative pressure gradient necessary for atmospheric air to flow inward.
C. The trachea is a rigid structure supported by C-shaped cartilaginous rings designed to maintain patency throughout the respiratory cycle. It does not contract or significantly decrease in diameter during normal inhalation. Any narrowing of the primary airway would increase resistance to airflow, which would be counterproductive to the goal of facilitating rapid air entry.
D. Contraction of the diaphragm causes it to flatten and move inferiorly, which increases the vertical dimension and overall volume of the thoracic cavity. This volume expansion leads to a drop in intrapleural pressure, following Boyle's Law, which pulls air into the lungs. This active muscular process is the primary driver of quiet inspiration in healthy human physiology.
Correct Answer is C
Explanation
A. Addison disease, or primary adrenal insufficiency, is most commonly caused by autoimmune destruction of the adrenal cortex in developed nations. Autoantibodies target the 21-hydroxylase enzyme, leading to a deficiency in cortisol and aldosterone production. This results in the characteristic systemic symptoms of fatigue, hypotension, and electrolyte imbalances seen in this autoimmune endocrinopathy.
B. Hyperthyroidism in the form of Graves' disease is a classic autoimmune condition where thyroid-stimulating immunoglobulins (TSI) mimic the action of TSH. These autoantibodies bind to the TSH receptors on the thyroid gland, triggering excessive and autonomous production of thyroid hormones. It is a Type 2 hypersensitivity reaction that bypasses the normal pituitary-thyroid feedback loop.
C. All choices are correct because Addison disease, Graves' disease, and rheumatoid arthritis are all defined by the immune system's failure to maintain self-tolerance. In each case, specific tissues or receptors are targeted by T-cells or B-cells, leading to chronic inflammation and functional impairment. These diseases represent various mechanisms of autoimmune-mediated tissue destruction and dysfunction.
D. Rheumatoid arthritis is a systemic autoimmune disorder primarily affecting the synovial joints through chronic inflammation and pannus formation. It involves a complex interplay of autoantibodies, such as rheumatoid factor and anti-citrullinated protein antibodies, and T-cell mediated cytokine release. This process leads to the progressive destruction of articular cartilage and subchondral bone.
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