New advances in the diagnosis of primary aldosteronism

Aldosterone-to-Renin Ratio Changes in Patients With Renal Artery Stenosis and Aldosteronism

We conducted a retrospective cohort study to investigate changes in the aldosterone-to-renin ratio (ARR) and other influencing factors in patients with renal artery stenosis (RAS) and primary aldosteronism (PA). Patients with RAS and PA admitted to our hospital between January 2016 and December 2021 were retrospectively selected. Based on the standardized PA screening results, the patients were divided into aldosterone-to-renin ratio-positive and -negative groups. The clinical features of the patients were compared. Binary logistic regression analysis was performed to identify the factors contributing to the comorbidity of RAS with false-negative PA. A total of 78 patients (mean age: 60.2 ± 10.2 years) were selected, among whom 46 (59%) were male. Overall, 69 patients had Stage 3 hypertension (88.5%) and 57 had hypokalemia (73.1%). Additionally, 42 (53.8%) and 36 (46.2%) patients were aldosterone-to-renin ratio-positive and -negative, respectively. The aldosterone-to-renin ratio-positive group showed significant differences in malignant hypertension (2.4% vs. 27.8%; p = 0.002), Stage 3 hypertension (81.0% vs. 97.2%; p = 0.033), and RAS degree (64.3 ± 16.4% vs. 71.8 ± 14.4%; p = 0.032). Malignant hypertension (odds ratio, 15.250; 95% confidence interval, 1.787-130.132; p = 0.013) and RAS degree (odds ratio, 1.034; 95% confidence interval, 1.002-1.068; p = 0.036) influenced the comorbidity of RAS with false-negative PA. Malignant hypertension and severe RAS can contribute to false-negative PA results. Therefore, PA screening test results should be carefully analyzed and rechecked following RAS treatment to confirm the presence of PA.

Development of a diagnostic model for pre-washout screening of primary aldosteronism

PURPOSE

Primary aldosteronism (PA) diagnosis is affected by antihypertensive drugs that are commonly taken by patients with suspected PA. In this study, we developed and validated a diagnostic model for screening PA without drug washout.

METHODS

We retrospectively analyzed 1095 patients diagnosed with PA or essential hypertension. Patients were randomly grouped into training and validation sets at a 7:3 ratio. Baseline characteristics, plasma aldosterone concentration (PAC), and direct renin concentration (DRC) before and after drug washout were separately recorded, and the aldosterone-to-renin ratio (ARR) was calculated.

RESULTS

PAC and ARR were higher and direct renin concentration was lower in patients with PA than in patients with essential hypertension. Furthermore, the differences in blood potassium and sodium concentrations and hypertension grades between the two groups were significant. Using the abbreviations potassium (P), ARR (A), PAC (P), sodium (S), and hypertension grade 3 (3), the model was named PAPS3. The PAPS3 model had a maximum score of 10, with the cutoff value assigned as 5.5; it showed high sensitivity and specificity for screening PA in patients who exhibit difficulty in tolerating drug washout.

CONCLUSION

PA screening remains crucial, and standard guidelines should be followed for patients to tolerate washout. The PAPS3 model offers an alternative to minimize risks and enhance diagnostic efficiency in PA for those facing washout challenges. Despite its high accuracy, further validation of this model is warranted through large-scale clinical studies.

Reliability Analysis of a Functional Diagnostic Test for Primary Hyperaldosteronism Based on Data Analysis

Primary aldosteronism (PA) is one of the most common causes of secondary hypertension, with a prevalence of 12-20% in the hypertensive population. To determine the characteristic function of a fuzzy concept based on the epidemiological data, clinical manifestations, and auxiliary examinations of PA, the essence is to select a suitable domain and determine the affiliation of each element in the domain. The aldosterone/renin ratio was proposed to increase the detection rate of PA, which has the shortcoming of a high underdiagnosis rate when relying only on clinical manifestations. However, there is no unified standard for the diagnostic cut point, and there are differences in testing methods and diagnostic cut point values for different populations, which require different laboratories to establish appropriate cut points according to different regional populations to improve the diagnostic accuracy. In this article, we analyzed the reliability of functional diagnostic tests for PA based on data analysis and compared the sensitivity and specificity of different plasma aldosterone cut points for the diagnosis of PA in the 40 mg kibbutz test. The results showed that when post-saline PAC and post-cato PAC were used to confirm the diagnosis of proaldosterone, respectively, there was a similar subject working area under the curve between SSST and CCT, 0.89 and 0.78, respectively, with no significant difference in the area under the curve between the two (p=0.546). Therefore, blood sodium and blood potassium have higher specificity and sensitivity than SUSPUP, but both are lower than ARR, and data analysis can be used as an auxiliary indicator for screening.

Secondary hyperaldosteronism and hypertension

Introduction: Arterial hypertension is a major cardiovascular risk factor affecting about 10-40% of the adult population. Secondary endocrine hypertension most often results from excessive aldosterone secretion. Complications related to excessive aldosterone secretion include atrial fibrillation, myocardial infarction, myocardial fibrosis, left ventricular hypertrophy, stroke, and increased cardiovascular mortality. Case report: This report presents a hypotensive woman with hypertensive reactions, newly diagnosed unilateral hyperplasia of the left adrenal gland and secondary hyperaldosteronism. Due to good blood pressure and normalized electrolyte status as a result of antihypertensive drug therapy and absence of damage to target organs, surgical treatment of unilateral adrenal hyperplasia was postponed. Conclusion: In case of midlife and late-life hypertension, it is necessary to consider a cause in the patient's endocrine system. AUTHORS SUMMARY SRPSKI 2021; 50 (1,2) 51-54