Fluid and Electrolytes ATI

Correct Answer: D

Rationale: Renin is released by the juxtaglomerular cells of the kidneys in response to decreased renal perfusion. Angiotensin-converting enzyme converts angiotensin I to angiotensin II. Angiotensin II, with its vasoconstrictor properties, increases arterial perfusion pressure and stimulates thirst. As the sympathetic nervous system is stimulated, aldosterone is released in response to an increased release of renin, which decreases urine production. Based on the nursing assessment and mechanism of injury, this is the most likely cause of the lower urine output.

Correct Answer: B

Rationale: In elderly patients, the clinical manifestations of fluid and electrolyte disturbances may be subtle or atypical. For example, fluid deficit may cause confusion or cognitive impairment in the elderly person.

Correct Answer: C

Rationale: Before preparing the skin, the nurse should ask the patient if he or she is allergic to latex or iodine, which are products commonly used in setting up for IV therapy. A local reaction could result in irritation to the IV site or, in the extreme, it could result in anaphylaxis, which can be life threatening.

Correct Answer: A

Rationale: Signs and symptoms of hypomagnesemia are largely confined to the neuromuscular system and include confusion, tremor, tetany, laryngeal stridor, and ataxia.

Correct Answer: A

Rationale: Diabetes insipidus is characterized by a deficiency in antidiuretic hormone (ADH), leading to excessive urine output and thirst.