NUR 601 Module 9 Final Project Example

Final Project: The Tipping Point, Portal Hypertension, Ascites and the Kidneys in a 56-Year-Old Man With Alcohol-Associated Liver Scarring

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Southern New Hampshire University

NUR 601: Advanced Pathophysiology

Final Project

[Instructor Name]

[Date]

The organization, setting and figures below are a composite written as a model document. No real employer, client, colleague or patient is described.

Final Project: The Tipping Point, Portal Hypertension, Ascites and the Kidneys in a 56-Year-Old Man With Alcohol-Associated Liver Scarring

Cirrhosis can be silent for years. Many patients feel well while scar tissue slowly replaces the liver, because the body compensates for rising portal pressure and falling liver function. The day compensation fails, the outlook changes: median survival falls from more than a decade to about two years (D'Amico et al., 2006). This final project follows a composite 56-year-old man across that line. It argues that his ascites, low sodium and kidney failure are not three separate problems but the costs of one compensation, the defense of arterial pressure against splanchnic vasodilation, and that tracing the chain from portal hypertension to the kidney explains both his findings and the logic of every treatment.

Case Presentation

He was diagnosed with alcohol-associated cirrhosis four years ago after an ultrasound for abnormal liver tests. At that time he had no symptoms and continued drinking about six beers a day. Over the past six weeks his abdomen has swollen, his ankles are puffy and he has gained 5 kg.

His blood pressure is 98/58 mm Hg and heart rate 96. He has spider angiomas on his chest, reddened palms, a palpable spleen and a tense abdomen with shifting dullness. Laboratory results show sodium 129 mEq/L, creatinine 1.9 mg/dL (0.9 a year ago), albumin 2.6 g/dL, bilirubin 3.1 mg/dL, international normalized ratio 1.7 and platelets 78,000 per microliter. Urine sodium is 8 mEq/L. Diagnostic paracentesis shows a serum-ascites albumin gradient of 1.8 g/dL, ascitic protein 1.0 g/dL and 90 neutrophils per cubic millimeter. Ultrasound shows a small nodular liver, a patent portal vein and an enlarged spleen.

Normal Physiology

The liver receives about three quarters of its blood from the portal vein, which drains the intestines and spleen, and the rest from the hepatic artery (Hall & Hall, 2021). Portal blood flows through the sinusoids, low-resistance channels lined by porous endothelium, so the pressure difference between the portal vein and the hepatic veins is normally only about 1 to 5 mm Hg. The liver synthesizes albumin, which maintains plasma oncotic pressure, and most clotting factors; it clears bilirubin and removes ammonia and other substances absorbed from the gut.

Arterial pressure is maintained by the balance of cardiac output and vascular resistance, and the kidneys defend it over the long term. When the arterial circulation senses underfilling, the renin-angiotensin-aldosterone system, the sympathetic nervous system and vasopressin act together to retain sodium and water and constrict vessels.

The Point of Failure

Years of alcohol injury switch on the liver's stellate cells, which deposit scar collagen and tighten around the sinusoids. Fibrous bands and regenerating nodules distort the sinusoids, and the endothelium produces less nitric oxide within the liver. Resistance to portal flow rises, partly from fixed scarring and partly from active vessel constriction. Portal pressure climbs. A pressure gradient of 10 mm Hg or more is considered clinically significant portal hypertension, the level at which varices and ascites become possible. At the same time, the loss of functioning liver cells lowers albumin and clotting factor production and reduces bilirubin clearance, reflected in his albumin of 2.6 g/dL, his international normalized ratio of 1.7 and his bilirubin of 3.1 mg/dL.

The serum-ascites albumin gradient confirms the source of his ascites. A gradient of 1.1 g/dL or more indicates portal hypertension (Biggins et al., 2021); his is 1.8 g/dL.

Compensation One: Collateral Veins

Blood that cannot pass easily through the liver finds other routes. Collateral veins between the portal and systemic circulations enlarge, including those at the lower esophagus and stomach. These collaterals decompress the portal system partially, but they are thin-walled and can rupture, which makes variceal bleeding one of the gravest complications of cirrhosis. Back pressure also enlarges the spleen, which traps platelets; his platelet count of 78,000 per microliter reflects this. He is referred for endoscopy to screen for varices.

Compensation Two: Defending Arterial Pressure

The second compensation explains most of his decompensation. As portal pressure rises, splanchnic arterioles widen, driven by nitric oxide and other vasodilators and by bacterial products reaching the circulation. Blood pools in the splanchnic bed, and the arterial circulation behaves as if it were underfilled even though total body fluid is increased. According to the peripheral arterial vasodilation hypothesis, the body responds to this effective underfilling by activating the renin-angiotensin-aldosterone system, the sympathetic nervous system and vasopressin release (Schrier et al., 1988). Cardiac output rises and heart rate increases, producing a hyperdynamic circulation, and his blood pressure of 98/58 mm Hg with a heart rate of 96 fits this pattern.

These systems defend arterial pressure, but each has a cost. Aldosterone drives avid sodium retention, shown by his urine sodium of only 8 mEq/L. Retained sodium and water, pushed by high portal pressure and low oncotic pressure from low albumin, leak into the peritoneal cavity as ascites and into the legs as edema. Vasopressin causes the kidneys to retain free water in excess of sodium, lowering his sodium to 129 mEq/L, a dilutional hyponatremia that reflects the intensity of the neurohormonal response rather than a lack of salt.

When Compensation Turns on the Kidneys

The last cost falls on the kidneys. As splanchnic vasodilation worsens, the same systems that defend arterial pressure constrict the renal arteries, reducing kidney blood flow and filtration. Kidney structure is normal; the failure is functional. When kidney function falls in this setting and does not improve after diuretics are stopped and albumin is given for two days, and when other causes such as shock, nephrotoxic drugs and structural kidney disease are excluded, the diagnosis is hepatorenal syndrome with acute kidney injury (Biggins et al., 2021). His creatinine did not improve after diuretic withdrawal and albumin, his urine sodium was very low and his urine sediment was bland, fitting that diagnosis.

Treatment Mapped to Mechanism

Each treatment targets a link in the chain. Stopping alcohol removes the ongoing injury and is the single change most likely to improve his liver function over time. Dietary sodium restriction to about 2 g a day reduces the sodium available for retention; diuretics, spironolactone to block aldosterone and furosemide to add loop natriuresis, are used for ascites when kidney function allows, but were held here because of his acute kidney injury. Large-volume paracentesis relieves tense ascites, with albumin given to protect the circulation. For hepatorenal syndrome, albumin expands the central volume and a vasoconstrictor such as terlipressin constricts the dilated splanchnic arteries, reversing the stimulus for renal vasoconstriction (Biggins et al., 2021). Nonsteroidal anti-inflammatory drugs are avoided because the kidney's remaining blood flow depends on prostaglandins. Liver transplant evaluation is appropriate, since decompensation signals a limited prognosis without it.

Implications for Primary Care

The most important window for a nurse practitioner is the compensated phase. During his four quiet years, continued drinking pushed him toward decompensation. Supporting alcohol cessation, monitoring for signs of decompensation, arranging variceal screening, screening for liver cancer as recommended, vaccinating and avoiding nephrotoxic drugs are all primary care actions. Recognizing that a patient with cirrhosis and a falling blood pressure or sodium is showing the strain of compensation, not simply a laboratory abnormality, allows earlier referral.

Conclusion

This man's liver disease crossed from compensated to decompensated because the compensations that protected him reached their limits. Scarring raised portal pressure; collaterals and an enlarged spleen followed; and splanchnic vasodilation set off a neurohormonal defense of blood pressure that retained sodium and water, lowered his sodium and finally constricted his kidneys. Seeing ascites, hyponatremia and hepatorenal syndrome as costs of one compensation explains his presentation and gives each treatment its reason.

References

Biggins, S. W., Angeli, P., Garcia-Tsao, G., Ginès, P., Ling, S. C., Nadim, M. K., Wong, F., & Kim, W. R. (2021). Diagnosis, evaluation, and management of ascites, spontaneous bacterial peritonitis and hepatorenal syndrome: 2021 practice guidance by the American Association for the Study of Liver Diseases. Hepatology, 74(2), 1014-1048. https://doi.org/10.1002/hep.31884

D'Amico, G., Garcia-Tsao, G., & Pagliaro, L. (2006). Natural history and prognostic indicators of survival in cirrhosis: A systematic review of 118 studies. Journal of Hepatology, 44(1), 217-231. https://doi.org/10.1016/j.jhep.2005.10.013

Hall, J. E., & Hall, M. E. (2021). Guyton and Hall textbook of medical physiology (14th ed.). Elsevier.

Schrier, R. W., Arroyo, V., Bernardi, M., Epstein, M., Henriksen, J. H., & Rodés, J. (1988). Peripheral arterial vasodilation hypothesis: A proposal for the initiation of renal sodium and water retention in cirrhosis. Hepatology, 8(5), 1151-1157. https://doi.org/10.1002/hep.1840080532