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- 2 Results of confirmatory tests between the OSAHS-RH-no PA and OSAHS-RH-PA groups
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- 4 The diagnosis value of PAC and ARR at screening for PA according to the degree of OSAHS
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- 3 The diagnosis value of PA among different indicators by ROC graph curves
This study investigated the diagnostic value of common screening indicators, including PRA, PAC, and ARR, for identifying PA among patients with moderate and severe OSAHS combined with RH. It is important to note that while these indicators can be utilized in settings with limited resources, they are not substitutes for definitive diagnostic tests. We found that ARR, across all patients, and PAC, especially in those with severe OSAHS, displayed moderate predictive utility for PA. In contrast, PRA exhibited limited predictive capacity for PA diagnosis, lacking sufficient diagnostic value compared to ARR and PAC. Notably, in the subgroup of patients with severe OSAHS, the screening efficacy of PAC and ARR was particularly significant. Early identification of PA using these indicators can lead to prompt intervention and improve patient outcomes.
2 Results of confirmatory tests between the OSAHS-RH-no PA and OSAHS-RH-PA groups
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While these indicators can streamline the initial assessment process in patients at higher risk of PA and potentially reduce costs, the definitive diagnosis should rely on more conclusive tests. ARR, plasma aldosterone-renin ratio; AVS, adrenal venous sampling; CCT, captopril challenge test; COPD, chronic obstructive pulmonary disease; MRA, mineralocorticoid receptor agonist; OSA, obstructive sleep apnea; PA, primary aldosteronism; SIT, saline infusion test. Using 45 as the cutoff value for ARR at screening, we achieved a sensitivity of 52% and a specificity of 86%, a positive predictive value of 87%, and a negative predictive value of 50%.

4 The diagnosis value of PAC and ARR at screening for PA according to the degree of OSAHS
Future studies will adhere more closely to diagnostic criteria guided by clinical guidelines. Lastly, our study was conducted in a single tertiary hospital center and involved a highly selected population. Therefore, our results need to be tested in a broader population to enhance their applicability and generalizability. The ROC curves of PAC and ARR at screening for the prediction of PA in (A,B) patients with severe OSAHS, and (C,D) patients with moderate OSAHS. PAC, plasma aldosterone concentration; ARR, plasma aldosterone-renin ratio; ROC, receiver operating characteristic; PA, primary aldosteronism; OSAHS, obstructive sleep apnea hypopnea syndrome. The current study focused on patients at high risk of PA, specifically those with moderate and severe OSAHS combined with RH, and found that the prevalence of PA in this population was as high as approximately 27%.
Third, in some cases, when patients had only one positive result in CCT and SIT, and expressed a strong desire for surgery, we performed adrenal vein sampling (AVS) on them. Those confirmed by AVS with bilateral or unilateral excessive secretion of aldosterone were diagnosed with primary aldosteronism (PA). However, it should be acknowledged that this diagnostic criterion carries some degree of scientific uncertainty. The AVS examination is typically used for subtype classification rather than confirming the diagnosis of PA itself.
1 Baseline characteristics of the study population
The population prevalence of OSAHS ranges from 9% to 38% (2), and its diagnosis relies mainly on polysomnography. The Red Building has been designed to exceed the expectations of the most demanding clients offering 400,000 square feet of world class office space in two towers atop eight levels of convenient parking in the heart of West Hollywood. We are home to over 70 luxury showrooms and offer an unparalleled line-up of residential and commercial products. To date, SPE’s 30-year tenure has yielded over $225,362,038 in projects successfully delivered at US military and federal facilities and OCONUS Embassies and allies’ military bases.
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Several limitations should be acknowledged when interpreting the findings of our study. First, this study was a single-center, cross-sectional observational study, and inevitable bias may affect the authenticity of the results, potentially weakening their reliability. Second, due to the lack of uniformity in diagnostic protocols and assay methods for measuring the ARR in different medical centers (17), the resulting cutoff values may vary substantially, limiting the generalization of the results of this study. Multi-center research is needed to further verify our findings among a broader population.
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However, at 2 h, patients in the OSAHS-PA group had significantly higher PAC levels compared to those in the OSAHS-no PA group, and the PAC suppression percentage was significantly lower in the OSAHS-PA group compared to the OSAHS-no PA group. Sea Pac Engineering, an A & B licensed general contractor with in-house design and craftsmen teams, provides clients with technically advanced design build, project execution, and consulting services. The 1.6 million square-foot campus presents nearly 100 boutique to international showroom brands, representing 2,200 product lines available to source by professional interior designers, architects, facility managers, decorators and dealers.
Additionally, it has been demonstrated that OSAHS severity was strongly correlated with an overnight reduction of leg fluid volume and calf circumference (24). Conversely, intermittent hypoxia caused by OSAHS might, in turn, exacerbate RAAS activation. Besides, significantly increased secretion of cortisol in patients with PA, independent of PA subtype or adenoma tissue genotypes, could also increase the risk of OSAHS (25, 26). The ROC curves of PAC (A), ARR (B) and PRA (C) at screening for the prediction of PA.
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ARR, plasma aldosterone-renin ratio; PAC, plasma aldosterone concentration; PA, primary aldosteronism; PRA, plasma renin activity; ROC, receiver operating characteristic. Previous studies have suggested that the co-morbidity of OSAHS and PA may mutually affect and exacerbate each other (9, 10).The prevalence of PA in the OSAHS population is as high as 34% (11), and the prevalence of OSAHS in the PA population is even higher at 78.1% (12). On one hand, excessive aldosterone secretion in patients with PA leads to water and sodium retention, causing edema of pharyngeal wall tissues and aggravating the severity of OSAHS (13). On the other hand, intermittent nocturnal hypoxia in patients with OSAHS may increase the activity of RAAS, which may lead to the occurrence and development of PA (9). Obstructive sleep apnea hypopnea syndrome (OSAHS) is a common sleep respiratory disorder characterized by apnea, intermittent hypoxia, and sleep fragmentation due to recurrent partial or total collapse of the upper airway during sleep (1).
Patients willing to undergo adrenalectomy were subjected to adrenal venous sampling (AVS), and the criteria used to determine the lateralization of aldosterone hypersecretion were established according to guideline (17). Designed by architect Cesar Pelli, FAIA, the beautifully landscaped, 14-acre campus is located in the City of West Hollywood, CA. In SIT, patients in the OSAHS-PA group exhibited significantly higher levels of PAC and PRA at both at immediately after the start of the infusion and 4 h compared to patients in the OSAHS-no PA group. In CCT, there was no significant difference in PAC at 0 h between patients in the OSAHS-PA group and those in the OSAHS-no PA group.
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