The nurse assesses a client with cirrhosis and finds 4+ pitting edema of the feet and legs, and massive ascites. Which mechanism contributes to edema and ascites in clients with cirrhosis?
A.
Hyperaldosteronism causing an increased sodium reabsorption in renal tubules.
B.
Decreased renin-angiotensin response related to an increase in renal blood flow.
C.
Decreased portacaval pressure with greater collateral circulation.
D.
Hypoalbuminemia that results in a decreased colloidal oncotic pressure
The correct answer and Explanation is :
The correct answer is D. Hypoalbuminemia that results in a decreased colloidal oncotic pressure.
Explanation:
Cirrhosis, a progressive liver disease, leads to various complications due to impaired liver function and structural changes. One of the hallmark features of cirrhosis is the development of edema and ascites, which can be explained by several mechanisms, but hypoalbuminemia is a primary contributor.
- Hypoalbuminemia: In cirrhosis, the liver’s ability to synthesize proteins, particularly albumin, is severely compromised. Albumin is a crucial protein in maintaining colloidal oncotic pressure, which is the force that pulls fluid back into the bloodstream from the interstitial space. When albumin levels fall, this oncotic pressure decreases, leading to fluid leakage into the interstitial spaces and abdominal cavity, resulting in pitting edema in the legs and feet, as well as massive ascites.
- Fluid Shifts and Portal Hypertension: Additionally, cirrhosis leads to portal hypertension due to increased resistance to blood flow in the liver. This condition further contributes to ascites by increasing hydrostatic pressure in the portal circulation, pushing fluid out into the peritoneal cavity.
- Compensatory Mechanisms: The body attempts to compensate for these changes through mechanisms such as increased renin and aldosterone secretion. Although this can lead to sodium and water retention, the underlying hypoalbuminemia remains a significant factor in fluid accumulation, as the retained fluid is unable to be effectively held within the vascular space due to low oncotic pressure.
- Clinical Implications: Recognizing hypoalbuminemia in patients with cirrhosis is crucial for managing fluid balance and preventing complications like infection (e.g., spontaneous bacterial peritonitis). Addressing the underlying liver dysfunction and considering interventions like diuretics or albumin replacement may be necessary to manage these fluid-related issues effectively.
In conclusion, while other mechanisms also play roles in fluid balance, hypoalbuminemia is the primary factor leading to the edema and ascites observed in clients with cirrhosis.