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Primary aldosteronism is associated with lower serum potassium and higher urinary albumin excretionPrimary aldosteronism shows distinct chemical markers compared to high blood pressure

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Key Takeaway
Note that primary aldosteronism is associated with lower potassium and higher albuminuria despite similar eGFR.

This meta-analysis synthesizes data from 74 observational studies involving 26,143 participants to compare biochemical and renal-metabolic profiles between patients with primary aldosteronism (PA) and essential hypertension (EH). The analysis identifies significant differences in electrolyte and metabolic markers, including lower serum potassium (SMD -1.15; -0.49 mmol/L) and higher serum sodium (SMD 0.51; +1.20 mmol/L) in patients with PA. Additionally, uric acid levels were lower in the PA group (SMD -0.23; -20.7 μmol/L).

Renal markers showed that urinary albumin excretion (SMD 0.73) and UACR/ACR (SMD 0.49) were higher in patients with PA. Conversely, no significant differences were found in creatinine, eGFR, or BUN between the two groups. A subgroup analysis showed that the difference in potassium levels compared to controls was greater in patients with high PAC than low PAC (SMD -1.44 vs. -1.03; p=0.010).

The authors note that the continuous PAC meta-regression was not significant. Clinically, these findings suggest that PA presents a persistent electrolyte phenotype and higher albuminuria despite similar cross-sectional filtration markers. Consequently, renal assessment should include UACR alongside routine filtration measures, and PA screening should not rely solely on the presence of overt hypokalemia.

How this fits prior evidence

This meta-analysis extends the understanding of the biochemical profile of primary aldosteronism. It builds upon previous evidence regarding the management of primary aldosteronism with mineralocorticoid receptor antagonists and aldosterone synthase inhibitors by providing a clearer profile of the electrolyte and renal markers associated with the condition. Specifically, it confirms that primary aldosteronism is associated with distinct metabolic markers compared to essential hypertension.

High blood pressure is common, but not all cases are the same. Some people have a specific condition called primary aldosteronism. This condition can cause distinct changes in the body's chemistry that differ from standard high blood pressure. Researchers looked at data from over 26,000 people to see how these two conditions compare.

The study found that people with primary aldosteronism often have lower levels of potassium and higher levels of sodium and uric acid compared to those with standard high blood pressure. They also showed higher levels of urinary albumin, which is a protein that should normally stay in the blood. While some markers like creatinine and blood urea nitrogen were similar in both groups, the difference in potassium was even more pronounced in certain cases.

These findings are important because they show that primary aldosteronism has a unique chemical signature. Because some people with the condition might have normal potassium levels, doctors should look at other markers, like urinary albumin, to help identify the condition. These results come from observational studies, which show a link between the condition and these specific chemical markers.

What this means for you:
Primary aldosteronism shows unique potassium and sodium levels compared to standard high blood pressure.

Common questions

How does primary aldosteronism differ from standard high blood pressure?

People with primary aldosteronism often have lower serum potassium and higher serum sodium and uric acid levels than those with standard high blood pressure. They also show higher levels of urinary albumin excretion. While some markers like creatinine and blood urea nitrogen are similar in both groups, these specific chemical differences help distinguish the two conditions.

Is low potassium the only way to find primary aldosteronism?

No, potassium levels are not the only indicator. The study suggests that because some people with primary aldosteronism do not have obvious low potassium, doctors should also check for other markers like urinary albumin to help identify the condition accurately.

What specific kidney markers were different in the study?

The study found that urinary albumin excretion was higher in patients with primary aldosteronism. However, other common markers like creatinine, blood urea nitrogen, and estimated glomerular filtration rate did not show significant differences between the two groups.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedSep 2026
View Original Abstract ↓
IntroductionTo characterize electrolyte and renal-metabolic profiles in primary aldosteronism (PA) compared with essential hypertension (EH), and to examine differences between unilateral/lateralizing and bilateral PA.MethodsPubMed, Embase, the Cochrane Library, and Web of Science were searched from inception through 13 July 2026. Random-effects meta-analyses pooled standardized mean differences (SMD; Hedges' g), supplemented by clinical-unit mean-difference analyses, subgroup analyses, sensitivity analyses, and study-level meta-regression.ResultsA total of 74 observational studies involving 26,143 participants were included. Compared with hypertensive controls, PA was associated with lower serum potassium (SMD = −1.15, 95% CI −1.27 to −1.02), higher serum sodium (SMD = 0.51, 95% CI 0.38 to 0.63), and lower uric acid (SMD = −0.23, 95% CI −0.35 to −0.12), whereas creatinine, estimated glomerular filtration rate (eGFR), and blood urea nitrogen (BUN) did not differ significantly. Corresponding PA-minus-control mean differences were −0.49 mmol/L for potassium, +1.20 mmol/L for sodium, and −20.7 μmol/L for uric acid. Potassium was lower in unilateral/lateralizing than in bilateral PA (SMD = −0.85). The potassium difference versus controls was greater in studies with high plasma aldosterone concentration (PAC) than in those with low PAC (SMD −1.44 vs. −1.03; p for subgroup difference = 0.010), although continuous PAC meta-regression was not significant. UACR/ACR and urinary albumin excretion were higher in PA (SMD = 0.49 and 0.73).DiscussionPA shows a persistent electrolyte phenotype and higher albuminuria despite similar cross-sectional filtration markers. These findings support renal assessment with UACR alongside routine filtration measures and reinforce that PA screening should not depend on overt hypokalemia alone.Systematic Review Registrationhttps://www.crd.york.ac.uk/PROSPERO/, identifier CRD420261286832.
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