Is nephrotic syndrome hereditary?

Written by Zhou Qi
Nephrology
Updated on September 08, 2024
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Nephrotic syndrome is generally not hereditary. It refers to a group of clinical symptoms and manifestations. The fundamental issue in patients is the damage to the glomerular capillaries, which leads to significant proteinuria, subsequently causing edema, hyperlipidemia, and hypoalbuminemia in the plasma. The causes of this disease are classified into primary and secondary types. Primary nephrotic syndrome is related to immune system dysfunction and may involve multiple genes; therefore, the disease is not considered a clear hereditary disease, but the likelihood of offspring developing renal issues may be higher than in the general population. Secondary nephrotic syndrome is mostly related to factors such as hepatitis B infection, allergies, diabetes, etc., and these diseases are not hereditary either.

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Written by Zhou Qi
Nephrology
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Causes of edema in nephrotic syndrome

Edema is a diagnostic criterion for nephrotic syndrome, as well as a major clinical symptom and characteristic of the syndrome. There are several reasons why patients develop edema. First, a large amount of protein leaks out from the kidneys, causing a decrease in the concentration of plasma albumin and a decrease in the colloid osmotic pressure in the plasma, which makes it easy for water to move from inside the blood vessels to outside, causing edema. Second, patients with nephrotic syndrome have increased vascular permeability, which also makes it easy for water to enter the interstitial tissues. Among patients with nephrotic syndrome, some are prone to acute renal failure, which further decreases the kidney's ability to excrete water, and these factors together lead to the common occurrence of edema in patients.

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Written by Zhou Qi
Nephrology
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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.

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Written by Zhang Hui
Nephrology
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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.

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Written by Zhou Qi
Nephrology
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Is nephrotic syndrome contagious?

So, nephrotic syndrome is a general term for a group of clinical symptoms, a state of disease, and is not essentially an independent disease. Thus, this problem is not infectious. This disease describes the damage to the kidneys due to some reason, leading to the disruption of the integrity of the glomerular filtration barrier, resulting in the patient developing a significant amount of urinary protein. The disease itself is not contagious. However, there are very few cases of nephrotic syndrome that might be caused by hepatitis B virus infecting the kidneys. In such cases, the hepatitis B virus may have a certain level of contagiousness, but even so, it does not imply that nephrotic syndrome itself is contagious. In other words, even if such patients transmit hepatitis B to others, it does not necessarily mean those others will exhibit kidney damage.

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Written by Zhou Qi
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Does nephrotic syndrome easily lead to cerebral infarction?

Nephrotic syndrome is a high-risk factor for cerebral infarction, making patients prone to strokes. This is because patients with nephrotic syndrome excrete large amounts of protein in their urine, which reduces protein concentration in the plasma and disrupts the anticoagulant fibrinolysis system, leading to an increased tendency to form blood clots. These clots are prone to develop in the veins of the lower extremities and the renal veins, and cerebral arteries in the skull are also susceptible to occlusion. Therefore, in such patients, if the plasma albumin level is very low, such as below 20 grams per liter, there is a need for routine use of anticoagulant medications.