The urinary system consists of the kidneys, ureters, urinary bladder, and urethra, and its main function is to remove toxic substances from the body through the production and expulsion of urine. The kidneys, specifically, are vital organs located in the back of the abdomen, just above the waist, one on each side of the spine. Their main function is to filter the blood to remove toxins and metabolic waste products, such as urea, creatinine, uric acid, excess minerals, and drug residues. This process occurs in microscopic structures called glomeruli, of which there are over a million in each kidney.
In addition to filtration, the kidneys have other essential functions:
- They control the body's water balance. They regulate the amount of water that is retained or expelled, which is essential for maintaining proper hydration.
- They maintain electrolyte and acid-base balance by regulating levels of sodium, potassium, calcium, phosphorus, and bicarbonate, which are essential elements for proper organ function.
- They produce erythropoietin (EPO), a hormone that stimulates the bone marrow to generate red blood cells and prevent anemia.
- They regulate blood pressure through hormonal mechanisms such as the renin-angiotensin-aldosterone system.
- They activate vitamin D, which is essential for calcium absorption and bone strengthening.
What happens when the kidneys fail?
Kidney failure occurs when one or both kidneys lose the ability to function properly. This condition can be classified into two main groups according to its progression:
- Acute renal failure (ARF): This condition appears suddenly and can be reversed if detected and treated promptly. ARF is usually the result of serious infections, severe dehydration, urinary obstructions, or adverse effects caused by certain medications. Although its symptoms are usually mild at first, immediate treatment is required to avoid permanent complications.
- Chronic kidney disease (CKD): This develops gradually and is usually irreversible. Its prevalence has increased mainly due to the aging population and factors such as diabetes, high blood pressure, and obesity, which are increasingly common conditions today.
Advances in diagnosis and treatment
Currently, diagnostic methods are more accurate and faster. Traditional analytical tests, such as urea nitrogen, creatinine, and albumin in urine, are now complemented by advanced imaging techniques such as magnetic resonance imaging and ultrasound. These techniques allow for the early identification of minimal structural changes.
With regard to treatment, innovative therapies have emerged that seek to slow the progression of chronic kidney disease, including specific medications that provide kidney protection in diabetic and hypertensive patients. Dialysis techniques have also been optimized, and are now less invasive and more comfortable for patients.
On the other hand, research in regenerative medicine has made significant advances toward the future possibility of regenerating kidney tissue using advanced cell therapies. Although still in the experimental stage, these advances offer significant hope for patients with severe kidney damage.
Prevention and kidney care
Prevention remains key. We recommend maintaining a balanced, low-sodium diet, exercising regularly, properly managing chronic conditions such as diabetes and hypertension, avoiding nephrotoxic medications, and undergoing regular medical checkups to detect any kidney problems early on.
Kidney failure continues to be a global health challenge. However, thanks to scientific and medical advances, both the management and quality of life of patients continue to improve significantly.
