Nursing care
Hyperaldosteronism nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Hyperaldosteronism nursing care centres on two things: controlling blood pressure and correcting potassium. Watch for hypertension that resists standard therapy alongside hypokalaemia with no diuretic to explain it. Spironolactone is the mainstay drug, and serum potassium is the value you track most closely, both before treatment and after.
The pathophysiology in one pass
Aldosterone comes from the adrenal cortex and its job is sodium retention in exchange for potassium and hydrogen excretion at the distal nephron. In primary hyperaldosteronism, usually from an adrenal adenoma or bilateral hyperplasia, the gland secretes aldosterone independently of the renin-angiotensin system. Sodium and water retention drive the blood pressure up. Potassium loss continues unchecked because the excess hormone keeps signalling the kidney regardless of the body's actual needs.
This is Conn syndrome when a single adenoma is the cause. Secondary hyperaldosteronism looks similar at the bedside but starts elsewhere, with renin driving the aldosterone rise in conditions like renal artery stenosis or heart failure. The nursing picture overlaps heavily between the two, but the distinction matters for the diagnostic workup and for how the care team frames the plan with the patient.
Assessment findings that matter
The signature combination is hypertension that does not respond well to standard first-line agents, paired with hypokalaemia in a patient who is not on a diuretic. That last detail is what separates this from the far more common drug-induced potassium loss nurses see every shift. Ask about diuretic use directly before assuming the low potassium fits the usual pattern.
Hypokalaemia itself produces muscle weakness, cramping, fatigue and, in more marked cases, paraesthesia. Some patients report polyuria and polydipsia, because chronic hypokalaemia impairs the kidney's concentrating ability. Metabolic alkalosis often accompanies the potassium loss and can show up as a subtle change in respiratory pattern or in an incidental arterial blood gas. Cardiac findings follow directly from the potassium: watch the ECG for flattened T waves, U waves or ectopy, and treat any of these as a reason to check the level again without delay.
What the exam asks about this
NCLEX-style items on this condition almost always test whether you can link hypertension and hypokalaemia together rather than treating them as separate findings. A question describing resistant hypertension with a low potassium and no diuretic on the medication list is testing recognition of hyperaldosteronism, even if the word never appears in the stem.
Expect questions on spironolactone's mechanism, since it is a potassium-sparing agent and the logic of using it here follows directly from the pathophysiology. You may also see items asking you to prioritise which assessment finding warrants the fastest follow-up, where the correct answer is usually the potassium level or an ECG change over a symptom like fatigue.
Nursing interventions in priority order
Confirm the potassium level and correlate it with the ECG before anything else. A significantly low or rapidly falling potassium takes priority over routine blood pressure management, because the cardiac risk moves faster than the hypertension does.
Monitor blood pressure at intervals appropriate to the clinical picture and document trends rather than isolated readings. Assess for muscle weakness and fall risk, since hypokalaemia-related weakness can affect mobility and safety. Review the medication list for interacting drugs, particularly other agents that affect potassium, and reinforce dietary sodium restriction as part of the overall blood pressure strategy. If surgery is planned for a unilateral adenoma, prepare the patient for adrenalectomy teaching and address the preoperative correction of electrolytes.
Medications and monitoring
Spironotone is the drug tied to this condition, an aldosterone antagonist that blocks the receptor directly and spares potassium while it lowers blood pressure. Because it is potassium-sparing, the monitoring priority shifts: instead of watching for hypokalaemia worsening, you watch for the potassium correcting, and in some patients overcorrecting into hyperkalaemia once the drug takes effect.
Check potassium regularly after starting or adjusting the dose, and repeat the ECG if new arrhythmic changes appear. Spironolactone can cause gynaecomastia and menstrual irregularities with longer use, so ask about these at follow-up rather than waiting for the patient to raise them unprompted. Renal function should be checked alongside potassium, since impaired kidney function raises the risk of dangerous hyperkalaemia on this drug.
When to escalate
Escalate for any ECG change consistent with significant hypokalaemia or hyperkalaemia, since either extreme carries arrhythmia risk. A potassium value outside the safe range, in either direction, warrants prompt provider notification rather than a repeat check at the next scheduled draw.
Also escalate a hypertensive reading that is markedly above the patient's baseline, new neurological symptoms suggesting a hypertensive emergency, or new severe muscle weakness that raises fall or respiratory concern. After starting spironolactone, an unexpectedly high potassium result is not something to wait out until the next shift.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our endocrine practice questions are the closest set to what this page covers.
Common questions
Why does hyperaldosteronism cause low potassium but not high sodium on the labs?
Aldosterone drives sodium reabsorption and potassium excretion at the distal nephron, but the retained sodium pulls water with it, so serum sodium usually stays within or near normal range even as total body sodium rises. The potassium loss shows up clearly because there is no proportional water shift to mask it.
Is hyperaldosteronism the same as Conn syndrome?
Conn syndrome specifically refers to primary hyperaldosteronism caused by a single aldosterone-secreting adenoma. Primary hyperaldosteronism more broadly also includes bilateral adrenal hyperplasia, so Conn syndrome is one subtype rather than a synonym for the whole condition.
Why give spironolactone instead of a standard diuretic here?
A thiazide or loop diuretic would worsen the potassium loss that is already the problem. Spironolactone blocks the aldosterone receptor directly, lowering blood pressure while sparing potassium, which addresses the underlying hormone excess rather than fighting against it.
What ECG changes should prompt an immediate potassium check?
Flattened T waves, prominent U waves, or new ectopic beats in a patient with known or suspected hyperaldosteronism should prompt an immediate potassium recheck. These changes reflect the myocardial irritability that comes with significant hypokalaemia and should not wait for the next routine lab draw.