FVH Kleintiere Practice Questions - Fachtierarzt FVH Für Kleintiere (Switzerland) Exam

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A 4-year-old female Standard Poodle presents with lethargy, vomiting, intermittent weakness, and mild bradycardia (HR 60 bpm). Serum biochemistry reveals sodium 128 mmol/L and potassium 6.8 mmol/L (Na:K ratio = 18.8). What is the primary pathophysiological basis for these electrolyte alterations?

Excess aldosterone secretion causing renal tubular sodium excretion and potassium retention Deficiency of aldosterone from adrenocortical destruction, leading to impaired distal renal tubular sodium resorption and potassium secretion Excess antidiuretic hormone (ADH) secretion leading to renal medullary wash-out and hyperkalemic metabolic alkalosis Renal medullary necrosis resulting in selective proximal tubular wasting of sodium and impaired hydrogen ion excretion

Correct Answer:

Deficiency of aldosterone from adrenocortical destruction, leading to impaired distal renal tubular sodium resorption and potassium secretion

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