What should be done if the left kidney has already atrophied?

The left kidney has already atrophied; the following measures should be taken: 1. Seek timely medical attention: The patient should promptly visit the nephrology department of a reputable hospital to determine the cause and severity of the atrophy through detailed examinations. 2. Eliminate the underlying cause: Provide targeted treatment according to the specific cause of left kidney atrophy. For example, if caused by renal artery stenosis, vascular stenting may be considered; if caused by diabetes, active blood glucose control is necessary. 3. Renal replacement therapy: If left kidney atrophy leads to renal failure, renal replacement therapy such as hemodialysis or peritoneal dialysis should be initiated to help remove waste products and excess fluid from the body. 4. Surgical treatment: Under certain circumstances, such as when left kidney atrophy causes refractory hypertension or severe obstructive hydronephrosis, surgical removal of the affected kidney may be necessary. 5. Lifestyle modifications: The patient should avoid excessive fatigue and ensure adequate rest; appropriately control sodium and protein intake in the diet; quit smoking and alcohol consumption to maintain a healthy lifestyle; and avoid using nephrotoxic drugs.