What is the most likely cause of the patient's hypertension?

Left renal artery stenosis-in this patient, hypertension is most likely caused by left renal artery stenosis, which led to increased renin secretion by the left kidney. the increased plasma renin activity causes an increased secretion of aldosterone, which increases na + reabsorption by the renal distal tubule. the increased na+ reabsorption leads to increased blood volume and blood pressure. the right kidney responds to the increase in blood pressure by decreasing its renin secretion. right renal artery stenosis causes a similar pattern of results, except that renin secretion from the right kidney, not the left kidney, is increased. aldosterone-secreting tumors cause increased levels of aldosterone, but decreased plasma renin activity (as a result of decreased renin secretion by both kidneys). pheochromocytoma is associated with increased circulating levels of catecholamines, which increase blood pressure by their effects on the heart (increased heart rate and contractility) and blood vessels (vasoconstriction); the increase in blood pressure is sensed by the kidneys and results in decreased plasma renin activity and aldosterone levels.