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CARDIAC DIMENSIONS ARE LARGELY DETERMINED BY DIETARY SALT IN PATIENTS WITH PRIMARY ALDOSTERONISM.

CARDIAC DIMENSIONS ARE LARGELY DETERMINED BY DIETARY SALT IN PATIENTS WITH PRIMARY ALDOSTERONISM. RESULTS OF A CASE CONTROL STUDY. Eduardo Pimenta , Richard D. Gordon, Ashraf H. Ahmed, Diane Cowley, Cynthia Kogovsek, Dianne Robson, Rodel Leano, Thomas H. Marwick, Michael Stowasser.

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CARDIAC DIMENSIONS ARE LARGELY DETERMINED BY DIETARY SALT IN PATIENTS WITH PRIMARY ALDOSTERONISM.

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  1. CARDIAC DIMENSIONS ARE LARGELY DETERMINED BY DIETARY SALT IN PATIENTS WITH PRIMARY ALDOSTERONISM. RESULTS OF A CASE CONTROL STUDY Eduardo Pimenta, Richard D. Gordon, Ashraf H. Ahmed, Diane Cowley, Cynthia Kogovsek, Dianne Robson, Rodel Leano, Thomas H. Marwick, Michael Stowasser Endocrine Hypertension Research Centre and Clinical Centre of Research Excellence in Cardiovascular Disease and Metabolic Disorders, University of Queensland School of Medicine Greenslopes and Princess Alexandra Hospitals

  2. BACKGROUND • Primary aldosteronism has been recognized as common cause of hypertension, with a possibly prevalence of 5-10% among general hypertensives. • Lim PO et al. Lancet 1999;353:40. • Fardella CE et al. J Clin Endocrinol Metab 2000;85:1863. • Mulatero P et al. J Clin Endocrinol Metab 2004;89:1045. • Aldosterone, in addition to blood pressure, contributes directly to target-organ damage by inducing inflammation and fibrosis. • Brilla CG et al. J Lab Clin Med 1992; 120:893. • Rocha R et al. Am J Physiol Heart Circ Physiol 2002; 283:H1802. • Sato A et al. Hypertens Res 2004; 27:303.

  3. BACKGROUND Aldosterone + 1% NaCl Score for myocardial necrosis Aldosterone + 0.3% NaCl Immunohistochemical staining with markers for heart fibrosis Rocha R et al. Am J Physiol Heart Circ Physiol 2002;283:H1802. Wang Q. Am J Physiol Renal Physiol 2004;286:F1178.

  4. ALDOSTERONE SALT TARGET-ORGAN DETERIORATION Brilla CG et al. J Lab Clin Med 1992; 120:893. Rocha R et al. Am J Physiol Heart Circ Physiol 2002; 283:H1802. Sato A et al. Hypertens Res 2004; 27:303. Pimenta E et al. Hypertension 2008;51:339.

  5. OBJECTIVES Investigate and compare the relationships between (1) aldosterone and (2) dietary salt and LV dimensions in patients with primary aldosteronism. Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  6. METHODS Subjects with confirmed PA (n=21) and controls (n=21) matched for age, gender, duration of hypertension and 24h SBP/DBP. All patients were prospectively evaluated with 24 h ABPM, transthoracic echocardiography and biochemical studies. Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  7. METHODS • Diagnosis of PA • ≥2 elevated plasma aldosterone/renin ratios off interfering Rx. • Positive fludrocortisone suppression test. • Four days administration of a high-sodium diet, slow-release sodium chloride (Slow Na 30 mmol three times daily with meals), and fludrocortisone acetate (0.1 mg every 6 h), • PAC measured at 10:00 h in seated patients after two to three hours upright, failed to suppress to below 6 ng/dL if: • upright PRA was suppressed to less than 1.0 ng/mL.h; • plasma potassium was within the normal range; • plasma cortisol was lower at 10:00 h than at 08:00 h, excluding an acute increase in adrenocorticotropic hormone that may have prevented suppression of aldosterone. Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  8. RESULTS Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  9. RESULTS Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  10. RESULTS - CONTROLS r=0.3296 p=NS r=0.2499 p=NS r=0.2739 p=NS r=0.1382 p=NS Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  11. RESULTS - PAL r=0.5165 p=0.0197 r=0.5735 p=0.0082 r=0.6062 p=0.0046 r=0.4043 p=0.0770 Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  12. CONCLUSIONS Dietary salt independently predicts LV thickness and mass in patients with primary aldosteronism, but not in patients with essential hypertension. Our results extend the findings in experimental studies to humans in suggesting that aldosterone excess may require high dietary salt to have the most pronounced effect in determining target-organ damage in patients with PA. Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

  13. CLINICAL IMPLICATIONS If confirmed, treatment strategies based on aldosterone blockade by mineralocorticoid receptors blockers, or reduction by unilateral adrenalectomy, associated with dietary strategies markedly reducing salt intake should translate into target organ protection and, consequently, reduction in CV risk among patients with PA. Pimenta et al. J Clin Endocrinol Metab 2011;96(9):2813-20.

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