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Nephrotic syndrome
How is nephrotic syndrome diagnosed?
Nephrotic syndrome is a general term for a group of clinical symptoms. Its primary diagnostic criteria include a 24-hour urine protein quantification of greater than or equal to 3.5 grams and plasma albumin less than or equal to 30 grams per liter; these two criteria are essential for the diagnosis of nephrotic syndrome. Meeting these criteria is sufficient for the diagnosis. There are also two additional supporting diagnostic criteria for nephrotic syndrome, which include possible symptoms of edema and hyperlipidemia. These four elements are the main clinical manifestations and diagnostic criteria of nephrotic syndrome.
Why does nephrotic syndrome cause sleepiness?
Excessive sleepiness is not a common clinical manifestation of nephrotic syndrome; generally, patients with nephrotic syndrome rarely exhibit excessive sleepiness. If a patient does display sleepiness, it is necessary to investigate the causes, such as a reduction in blood volume and decreased blood pressure caused by nephrotic syndrome, leading to insufficient cerebral blood supply. Furthermore, in cases of nephrotic syndrome, the patient’s immune capacity decreases, making them more susceptible to various infections, such as infections of the upper respiratory tract and lungs. When inflamed, patients are also likely to feel excessively sleepy. In some patients, there is a risk of cerebral infarction, which can also cause sleepiness.
Kidney disease syndrome is classified as what disease?
Nephrotic syndrome is a clinical subtype of chronic kidney disease. It can be diagnosed when there is significant proteinuria, hypoalbuminemia, accompanied by edema and hyperlipidemia. This represents a severe stage in the progression of kidney diseases, generally requiring treatment with steroids and immunosuppressants. Nephrotic syndrome may have complications such as thrombosis, infections, hyperlipidemia, and acute renal failure.
What is nephrotic syndrome?
Nephrotic syndrome is a common manifestation of glomerular disease, caused by a variety of etiologies, with large differences in treatment response and prognosis. The pathological causes of nephrotic syndrome are diverse, with the most common types being minimal change disease, focal segmental glomerulosclerosis, mesangial proliferative nephritis, membranous nephropathy, and membranoproliferative glomerulonephritis. Nephrotic syndrome can be classified into primary and secondary types based on its cause. The diagnosis of primary nephrotic syndrome mainly depends on the exclusion of secondary nephrotic syndrome. Common causes of secondary nephrotic syndrome include diabetic nephropathy, lupus nephritis, renal amyloidosis, drug-induced nephropathy, and renal tumors.
Criteria for the diagnosis of nephrotic syndrome
The diagnostic criteria for nephrotic syndrome include massive proteinuria, with urinary protein greater than 3.5 grams/day, hypoalbuminemia, with plasma albumin less than 30 grams/liter, severe edema, and hyperlipidemia, which includes significant increases in plasma cholesterol and triglycerides. The first two criteria are essential for the diagnosis of nephrotic syndrome, while the latter two are secondary. Clinically, if the two necessary criteria are met, the diagnosis of nephrotic syndrome is established. Patients with nephrotic syndrome should undergo a renal biopsy to determine the pathological type and guide clinical treatment.
Does nephrotic syndrome require a puncture?
Nephrotic syndrome is a complex of clinical symptoms with various causes, which differ by age group. In children or adolescents, if it presents solely as significant proteinuria without elevated creatinine or hematuria, it is generally caused by minimal change disease. Since this type of kidney disease is sensitive to hormone treatment, it is usually possible to forego renal biopsy and start with corticosteroid therapy. For other nephrotic syndrome patients, it is advisable to first perform a renal biopsy to identify the pathological cause before considering appropriate treatment with hormones, immunosuppressants, and other medications.
What to do if nephrotic syndrome causes leg pain?
Patients with nephrotic syndrome who experience leg pain mostly have conditions unrelated to nephrotic syndrome itself. It could be due to diseases of the skeletal or muscular system. However, some patients might experience leg pain due to thrombosis caused by nephrotic syndrome, leading to ischemia in the limbs. Also, long-term use of corticosteroids can lead to necrosis of the femoral head, osteoporosis, and pain. Therefore, treatment should be targeted based on the cause, such as using drugs to dissolve clots or interventional surgery for those with thrombosis. In severe cases of femoral head necrosis, a femoral head replacement surgery might be necessary, and it is important to supplement with calcium regularly.
Characteristics of Nephrotic Syndrome
The characteristics of nephrotic syndrome are defined by significant proteinuria, where significant proteinuria refers to urinary protein exceeding 3.5 grams in 24 hours; hypoproteinemia, which refers to blood albumin levels below 30 grams per liter; edema, which may present in facial and lower limbs, and even severe patients may exhibit generalized edema around both lower limbs; and hyperlipidemia, characterized by increased cholesterol and triglycerides in the blood. These patients may exhibit reduced urine output, edema, and noticeably increased foam in the urine.
What tests are conducted for nephrotic syndrome?
Patients with nephrotic syndrome need to complete routine urine tests, 24-hour urine protein quantification, liver and kidney function tests, routine blood tests, electrolyte panels, blood glucose tests, and lipid profiles. Additionally, it is important to determine the cause of nephrotic syndrome, excluding the possibility of nephrotic syndrome caused by immune system diseases, including tumors, vasculitis, lupus, and other diseases. These tests include rheumatoid immune panels, antinuclear antibody spectrum, anti-GBM antibodies, ANCA panel, and immunoglobulins. Moreover, these patients should undergo kidney ultrasound, tumor marker tests, and thyroid function tests.
Characteristics of Nephrotic Syndrome
The characteristic feature of nephrotic syndrome is that patients may experience edema, which is related to the nature of this disease. The essence of this disease is due to some reason that damages the glomerular capillary filtration barrier. As a result, when blood passes through the glomeruli, it leaks proteins from the blood. A 24-hour urinary protein quantification will exceed 3.5 grams, which constitutes a large amount of urinary protein. Consequently, a large amount of protein is leaked into the urine, causing the protein concentration in the plasma to decrease. This leads to a reduction in the colloidal osmotic pressure of the plasma, causing fluid to move from inside the blood vessels to outside, thus leading to edema. Therefore, the most significant clinical feature of nephrotic syndrome is the potential to cause edema, and severe cases of edema may elevate blood pressure, lead to pulmonary edema, manifesting as difficulty breathing, chest tightness, and shortness of breath.