The Clinicopathologic Significance of Unilateral Adrenal Cortical Hyperplasia: Report of an Unusual Case and a Review of the Literature

Atrial Fibrillation and Aortic Ectasia as Complications of Primary Aldosteronism: Focus on Pathophysiological Aspects

Primary aldosteronism (PA) is the most common cause of secondary hypertension. A growing body of evidence has suggested that, beyond its well-known effects on blood pressure and electrolyte balance, aldosterone excess can exert pro-inflammatory, pro-oxidant and pro-fibrotic effects on the kidney, blood vessels and heart, leading to potentially harmful pathophysiological consequences. In clinical studies, PA has been associated with an increased risk of cardiovascular, cerebrovascular, renal and metabolic complication compared to essential hypertension, including atrial fibrillation (AF) and aortic ectasia. An increased prevalence of AF in patients with PA has been demonstrated in several clinical studies. Aldosterone excess seems to be involved in the pathogenesis of AF by inducing cardiac structural and electrical remodeling that in turn predisposes to arrhythmogenicity. The association between PA and aortic ectasia is less established, but several studies have demonstrated an effect of aldosterone on aortic stiffness, vascular smooth muscle cells and media composition that, in turn, might lead to an increased risk of aortic dilation and dissection. In this review, we focus on the current evidence regarding the potential role of aldosterone excess in the pathogenesis of AF and aortic ectasia.

Is primary aldosteronism a potential risk factor for aortic dissection? A case report and literature review

BACKGROUND

Primary aldosteronism (PA) increases the risk of cardiovascular morbidity, including stroke, coronary artery disease, atrial fibrillation, and heart failure. The relationship between primary aldosteronism and aortic dissection has rarely been reported. We report a case of aortic dissection caused by secondary hypertension from PA and review similar cases in the literature.

CASE PRESENTATION

A 56-year-old woman with a history of surgery for aortic dissection presented for follow-up of hypertension and a left adrenal mass. She had been diagnosed with hypertension and hypokalemia in 2003. Blood pressure had been controlled by antihypertensive medications. In 2009, she presented with chest and back pain; she was diagnosed with aortic dissection by computed tomography (CT). She underwent placement of an endovascular aortic stent graft. CT at that time showed a left adrenal mass with a diameter of 1 cm. In 2017, CT reexamination revealed that the left adrenal mass had grown to 3 cm in diameter. Laboratory data showed blood potassium 2.4 mmol/L (reference range: 3.5-5.3 mmol/L). The plasma aldosterone/renin ratio was elevated because of suppressed plasma renin and elevated serum aldosterone levels. Plasma aldosterone levels were not suppressed after taking captopril. Positron emission tomography/CT showed that the left adrenal tumor radiographic uptake was slightly increased (maximum standardized uptake value of 2.2), and metastasis was not detected. Laparoscopic adrenalectomy was performed, and an adrenocortical adenoma was confirmed histopathologically. After surgery, blood pressure and laboratory findings were within their reference ranges without any pharmacological treatment.

CONCLUSIONS

Our patient and the literature suggest that PA is a potential cause of aortic dissection. Diagnosing PA in the early stages of the disease and early treatment are important because affected patients may be at increased risk of aortic dissection.

Larger ascending aorta in primary aldosteronism: a 3-year prospective evaluation of adrenalectomy vs. medical treatment

OBJECTIVE

Primary aldosteronism is associated with higher cardiovascular morbidity as compared with essential hypertension. Vascular complications encompass myocardial infarction and cerebrovascular events. Aortic damage in primary aldosteronism has never been explored, although a few cases of ascending aorta aneurisms have been reported.

DESIGN AND METHODS

We consecutively enrolled patients affected by primary aldosteronism (n = 45) and compared them with patients affected by essential hypertension (n = 47), on an outpatient setting. Echocardiographic data of patients with primary aldosteronism were collected during a mean follow-up of 3 years, in subjects who underwent adrenal surgery (n = 12) and those on mineralocorticoid receptor antagonists (n = 33).

RESULTS AND CONCLUSION

We found that patients with primary aldosteronism had larger ascending aorta diameters than those with essential hypertension before starting any specific treatment. Patients with primary aldosteronism did not show significant changes in the size of ascending aorta during a mean of 3 years of follow-up, irrespective of the type of treatment (medical vs. surgical treatment). A longer follow-up will better clarify if worsening of the aortic damage may be better prevented by surgery rather than by mineralocorticoid receptor antagonists.

Clinical outcomes of laparoscopic adrenalectomy for lateralizing nodular hyperplasia

BACKGROUND

Nodular adrenal hyperplasia (NAH) may mimic the biochemical characteristics of an aldosterone-producing adenoma. The authors evaluated the outcomes of unilateral laparoscopic adrenalectomy in the setting of lateralizing aldosterone hypersecretion by NAH.

METHODS

Retrospective review of consecutive patients who underwent a laparoscopic adrenalectomy for primary hyperaldosteronism owing to NAH was performed. Patient demographics, perioperative symptoms, medications, radiographic findings, and serum chemistries were analyzed. Response to operation was classified according to postoperative control of hypertension and hypokalemia as resolved, improved, or refractory.

RESULTS

From January 1999 to October 2004, 15 patients underwent a laparoscopic unilateral adrenalectomy for hyperaldosteronism owing to lateralizing NAH. Nine (60%) patients presented with > or =5 years of hypertension, including 8 (53%) patients with labile or malignant hypertension. Ten (67%) patients had hypokalemia. Abdominal imaging results were normal in 9 (60%) patients. All patients underwent adrenal venous sampling (94% successfully), which revealed an average adjusted aldosterone ratio of 17.6 (range, 1.2 to 75.9). At a mean follow-up of 26 (range, 4 to 58) months, hypertension had resolved in 4 (27%), improved in 8 (53%), and was refractory in 3 (20%) patients. Hypokalemia resolved in all patients. There were no complications, conversions, or mortalities.

CONCLUSION

This series shows that unilateral adrenalectomy for lateralizing NAH results in eradication of hypokalemia and resolution or significant improvement in hypertension in 80% of patients at long-term follow-up. When lateralization of aldosterone production is noted, laparoscopic adrenalectomy provides significant clinical improvement even in patients with a pathologic diagnosis of NAH.