Ascites
- 1. PRACTICE GUIDANCE | Hepatology, Vol. 74, No. 2, 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 Scott W. Biggins, Paulo Angeli, Guadalupe Garcia-Tsao, Pere Ginès , Simon C. Ling,7 Mitra K. Nadim,8 Florence Wong, and W. Ray Kim
- 5. DIETARY SODIUM RESTRICTION AND DIURETIC THERAPY • In most patients with cirrhosis presenting with ascites, dietary sodium restriction alone is insuffi- cient and diuretic therapy is necessary. • Assessment of 24-hour urinary sodium excretion may be useful to guide therapy; in the absence of renal dysfunction, sodium excretion lower than the intake (e.g., 80 mmol/day) indicates an insufficient diuretic dose.
- 6. GUIDANCE STATEMENTS • • Moderate sodium restriction (2 g or 90 mmol/day) and diuretics (spironolactone with or without furo- semide) are the first-line treatment in patients with cirrhosis and grade 2 ascites. • After ascites is adequately mobilized, attempts should be made to taper the diuretics to the lowest dose necessary to maintain minimal or no ascites to prevent the development of adverse effects. • Fluid restriction is not necessary for ascites manage- ment unless there is concomitant moderate or severe hyponatremia (serum sodium ≤ 125 mmol/L). • In patients receiving diuretics, body weight and serum creatinine and sodium should be regularly monitored to assess response and to detect the de- velopment of adverse effects. • Human albumin solution (20-40 g/week) or ba- clofen administration (10 mg/day, with a weekly increase of 10 mg/day, up to 30 mg/day) can be considered in cases of severe muscle cramps.
- 7. GUIDANCE STATEMENTS • LVP is the first-line treatment of grade 3 ascites. After paracentesis, sodium restriction and diuretics should be started. • Referral for LT evaluation should be considered in patients with grade 2 or 3 ascites.
- 8. GUIDANCE STATEMENTS • • Nonsteroidal anti-inflammatory drugs, angiotensin- converting enzyme inhibitors, and angiotensin re- ceptor blockers should be avoided in patients with cirrhosis and ascites. • Aminoglycosides should be avoided whenever pos- sible in the treatment of bacterial infections. • For patients with cirrhosis and diuretic-responsive ascites, controversial data suggest potential benefits of long-term infusion of human albumin solution. At present, no recommendation can be made for its use in routine clinical practice.
- 11. GUIDANCE STATEMENTS (Na, Fluids and Albumin in RA) • Continued dietary sodium restriction (<2 g/day) is required in patients with RA to reduce the rate of ascites accumulation. • Fluid restriction is ineffective for the management of RA, but restricting fluid intake to less than 1,000 mL/day is recommended for treatment of hy- ponatremia (e.g., <125 mEq/L). • In the management of RA, there are insufficient data to recommend the long-term use of albu- min infusions outside the setting of large- volume paracenteses.
- 12. GUIDANCE STATEMENTS • LVP is the first-line treatment for RA. • Albumin infusion at the time of LVP of >5 L is rec- ommended to mitigate the risk of PPCD. The risk of PPCD may increase with >8 L of fluid evacuated in one single session. • The recommended dose of albumin replacement, based on expert opinion, is 6-8 g for every liter of ascites removed.
- 13. CONTROVERSY ABOUT NONSELECTIVE BETA- BLOCKERS IN PATIENTS WITH RA • For now, we can only caution the use of NSBB in patients with RA, especially in those with hemodynamic abnormalities as indicated by low systolic blood pressure <90 mm Hg, hyponatremia with serum sodium <130 mmol/L, or serum creatinine of >1.5 mg/dL. • NSBBs might be reintroduced if circulatory dysfunction improves with improvement of these parameters. • *** Based on currently available data, NSBBs are not necessarily contraindicated in patients with RA. However, caution is recommended in patients with hypotension, hyponatremia, or AKI.
- 14. GUIDANCE STATEMENTS (Hyponatremia) • Mild hyponatremia (Na 126-135 mEq/L) in cirrho- sis without symptoms does not require specific management apart from monitoring and waterrestriction. • Water restriction to 1,000 mL/day and cessation of diuretics is recommended in the management of moderate hyponatremia (120-125 mEq/L), and a more severe restriction of water intake with albumin infusion is recommended for severe hyponatremia (<120 mEq/L). • The use of vasopressin receptor antagonists in cir- rhosis can raise serum sodium during treatment. However, they should be used with caution only for a short term (≤30 days). • The use of hypertonic saline is reserved for short- term treatment of patients with symptomatic or se- vere hyponatremia or those with imminent LT. • When correction of chronic hyponatremia is in- dicated in patients with cirrhosis, the goal rate of increase of serum (Na) is 4-6 mEq/L per 24-hour period, not to exceed 8 mEq/L per 24-hour period to ameliorate the risk of ODS. • Severe hyponatremia (<120 mEq/L) at time of LT increases the risk of ODS with LT. Multidisciplinary coordinated care may mitigate the risk of ODS.
- 15. GUIDANCE STATEMENTS (SBP) • Patients with ascites due to cirrhosis emergently ad- mitted to the hospital should undergo a diagnostic abdominal paracentesis to rule out SBP even in the absence of symptoms/signs of infection. • Patients with ascites who develop signs, symptoms, or laboratory abnormalities suggestive of infection should undergo workup for infection plus a diag- nostic abdominal paracentesis (for cell count and bacteriological culture). If the workup is negative and the patient has a pleural effusion, the patient should undergo a diagnostic thoracentesis. • The ascitic fluid should be cultured at the bedside in aerobic and anaerobic blood culture bottles before initiation of antibiotics. • The diagnosis of SBP/SBE is established with a fluid polymorphonuclear (PMN) leukocyte count >250/mm3.
- 16. GUIDANCE STATEMENTS (MANAGEMENT OF SBP) • Patients with ascites due to cirrhosis emergently ad- mitted to the hospital should undergo a diagnostic abdominal paracentesis to rule out SBP even in the absence of symptoms/signs of infection. • Patients with ascites who develop signs, symptoms, or laboratory abnormalities suggestive of infection should undergo workup for infection plus a diag- nostic abdominal paracentesis (for cell count and bacteriological culture). If the workup is negative and the patient has a pleural effusion, the patient should undergo a diagnostic thoracentesis. • The ascitic fluid should be cultured at the bedside in aerobic and anaerobic blood culture bottles before initiation of antibiotics. • The diagnosis of SBP/SBE is established with a fluid polymorphonuclear (PMN) leukocyte count >250/mm3.
- 17. GUIDANCE STATEMENTS (MANAGEMENT OF SBP) • IV antibiotics should be started empirically in all patients with an ascites/pleural fluid PMN count >250/mm3. • First-line empirical antibiotic therapy for community-acquired SBP/SBE is IV third- generation cephalosporin. • In patients with a health care–associated or nosoco- mial infection or recent exposure to broad- spectrum antibiotics or who are admitted with sepsis or septic shock, empirical therapy with broad-spectrum anti- biotics should be initiated as the first line. • Response to empirical antibiotic therapy may be assessed by repeating diagnostic paracentesis/thora- centesis 2 days after initiation. A decrease in fluid PMN <25% from baseline indicates lack of response and should lead to broadening of antibiotic cover- age and further evaluation to rule out secondary bacterial peritonitis. • Patients with SBP should be treated with IV albu- min in addition to antibiotics (1.5 g/kg at day 1 and 1 g/kg at day 3). Patients with AKI and/or jaundice at time of diagnosis of SBP are more likely to ben- efit from albumin. • NSBBs should be temporarily held in patients with SBP who develop hypotension (mean arterial pres- sure <65 mm Hg) or AKI.
- 18. GUIDANCE STATEMENTS • Patients who have recovered from an episode of SBP should receive long- term prophylaxis with daily norfloxacin. In settings in which norfloxacin is unavailable, oral ciprofloxacin is acceptable. • Antibiotic prophylaxis for SBP should be instituted in patients with cirrhosis and upper gastrointesti- nal hemorrhage. IV ceftriaxone 1 g/24 hours is the antibiotic of choice and should be used for a maxi- mum of 7 days. • In patients with cirrhosis and low protein (<1.5 g/L) ascites, primary SBP prophylaxis can be consid- ered in selected patients with renal dysfunction (serum creatinine level >1.2 mg/dL, blood urea nitrogen level >25 mg/dL, or serum sodium level <130 mEq/L) or liver failure (Child-Turcotte-Pugh score >9 and bilirubin >3 mg/dL).
- 22. GUIDANCE STATEMENTS (HRS) • The treatment of choice for HRS-AKI is vasocon- strictor drugs in combination with albumin. The preferred drug is terlipressin, administered either as IV bolus or continuous IV infusion. • In settings where terlipressin is not available, nor- epinephrine should be given. If neither can be ad- ministered, a trial of oral midodrine (5 to 15 mg per os every 8 hours) in combination with octreotide (100 to 200 μg every 8 hours or 50 μg/hour IV) may be considered, yet the efficacy is low. • Patients should be closely monitored for the possi- ble development of side effects of vasoconstrictors and albumin, including ischemic complications and pulmonary edema. • Response to terlipressin or norepinephrine is defined by creatinine decreases to <1.5 mg/dL or return to within 0.3 mg/dL of baseline over a maximum of 14 days. In patients whose creatinine remains at or above the pretreatment level over 4 days with the maximum tolerated doses of the vasoconstrictor, therapy may be discontinued. • Recurrence may occur after treatment discontinua- tion and should be retreated. • All patients with cirrhosis and AKI should be consid- ered for urgent LT evaluation given the high short- term mortality even in responders to vasoconstrictors.
- 23. GUIDANCE STATEMENTS (HRS) • RRT should be used in candidates for LT with worsening renal function or electrolyte disturbances or increasing volume overload unresponsive to va- soconstrictor therapy. Initiation of RRT in patients who are not candidates for LT must be made with a clear endpoint in mind. • Given the complexity of patients with suspected HRS-AKI, decisions about management includ- ing initiation of vasoconstrictor therapy and RRT should be made, if possible, by multidisciplinary teams including specialists in hepatology, nephrol- ogy, critical care, and transplant surgery. • Simultaneous liver-kidney transplantation may be necessary for patients who are not expected to re- cover kidney function posttransplantation.
Editor's Notes
- #2: This is a comprehensive guidance on the diagnosis, evaluation, and management of ascites and hepato- renal syndrome (HRS) in patients with chronic liver disease from the American Association for the Study of Liver Diseases (AASLD). The AASLD Practice Guidelines Committee chose to perform a Guidance on this topic because a sufficient number of random- ized controlled trials were not available to support meaningful systematic reviews and meta-analyses.
- #3: Pathogenesis of ascites and related complications of cirrhosis. The central event consists of effective arterial underfilling as a result of splanchnic vasodilation leading to activation of vasoconstrictor (e.g., renin-angiotensin) and antidiuretic (e.g., arginine vasopressin) factors. Portal hypertension leading to increased sinusoidal hydrostatic pressure and increased gut permeability allowing bacterial translocation, contributing further to the pathogenesis of complications associated with ascites, including hyponatremia, AKI, HRS, and spontaneous bacterial infections.
- #4: guidance Statements • A diagnostic paracentesis should be performed in all patients with new-onset ascites that is accessible for sampling. • The initial laboratory investigation of ascitic fluid should include ascitic fluid neutrophil count, ascitic fluid total protein, ascitic fluid albumin, and serum al- bumin to calculate the serum-ascites albumin gradient.
- #5: In patients with cirrhosis, ascites can be graded according to the amount of fluid accumulated in the abdominal cavity and classified according to response to treatment (Table 5).(19) No treatment is recommended for grade 1 ascites, as there is no evi- dence that it improves patient outcomes. Response to therapy and subsequent outcome in patients with grade 2 or 3 ascites depends on several factors such as the underlying cause of cirrhosis; feasibility and effectiveness of therapy to alter the natural course of cirrhosis; presence of superimposed complica- tions such as renal failure, hyponatremia, and spon- taneous bacterial peritonitis (SBP); and adherence of the patient to dietary sodium restriction and diuretics. Moderate dietary sodium restriction (2 g or 90 mmol/day) should be prescribed to achieve a neg- ative sodium balance and net fluid loss. Fluid restric- tion is not indicated unless hyponatremia is present.
- #6: The peri- toneal membrane’s ability to reabsorb ascites from the abdominal cavity is limited to approximately 500 mL per day. When a 24-hour urine collection is not fea- sible, a random “spot” urine sodium concentration that is greater than the potassium (K) concentration correlates well with 24-hour urine sodium excre- tion. spot urine sodium (Na)/K ratio is >1, the patient should be losing fluid weight,(28) and, if not, dietary noncompliance should be sus- pected. Spot urine Na/K ratio is ≤1, there is insufficient natriuresis, and an increase in diuretics should be considered.
- #9: Given the hemodynamic abnormalities in patients with cirrhosis and ascites, medications that may further reduce effective arterial volume and renal perfusion should be avoided.
- #10: RA occurs in approximately 5%-10% of all patients with cirrhosis and ascites and is associated with poor survival of 50% at 6 months RA is defined as ascites that cannot be mobilized or recurs after LVP despite dietary sodium restriction and diuretic therapy.( Thus, RA is further divided into (1) diuretic resistant (i.e., persistent ascites despite maximal doses of diuretics) and (2) diuretic intracta- ble, in which side effects of diuretics preclude the use of maximum doses (Table 7).(59) Recurrent ascites, which is defined as ascites that recurs at least three times within 1 year despite dietary sodium restriction and diuretic therapy, may be a forerunner of RA.(59) Figure 3 outlines the suggested treatment algorithm for RA management.
- #11: FIg. 3. Treatment algorithm for management of RA. All three criteria should be met for diagnosis of RA. 1Typically 160 mg furosemide and 400 mg spironolactone. 2PPCD. 3For example, MELD >18. Abbreviation: LT, liver transplant. Fluid restriction in a patient with cirrhosis and RA is difficult to enforce and is often impractical. These patients’ daily urine output is usually less than 1 L, making it virtually impossible to achieve a negative fluid balance by restricting fluid intake to less than the urine output. The serum sodium concentration at which fluid restriction should be instituted has not been well defined(60) but is recommended when serum sodium is ≤125 mmol/L or its onset is rapid
- #13: VP, arbitrarily defined as a paracentesis of >5 L, has been shown to be safe and effective in the man- agement of RA. When done repeatedly, LVP has a lower incidence of electrolyte abnormalities, renal dys- function, and hemodynamic disturbance with similar survival compared with continued diuretic use. The clinical manifes- tations of PPCD include renal impairment, including HRS, dilutional hyponatremia, hepatic encephalopa- thy, and death.(64,65) Albumin infusion is particularly important if more than 5 L of ascites are removed to prevent the development of PPCD.(28,66) Paracenteses of a smaller volume are not associated with significant hemodynamic changes,(67) and albumin infusion may not be required. Although there has not been a dose- response study on albumin use with LVP, the adminis- tration of 6-8 g of albumin per liter of ascites removed has been recommended. the risk of PPCD increases with >8 L of fluid evacuated in one single session. In patients with hemodynamic instability (systolic blood pressure <90 mm Hg), hyponatremia (serum sodium <130 mmol/L), and/or the presence of AKI, albumin infusion should be strongly considered for paracente- sis of a smaller volume. Therefore, elevated prothrombin time or thrombocytopenia is not a contra- indication for paracentesis, nor is transfusion of clotting factors or platelets recommended. Possible exceptions may include patients with disseminated intravascular coagulation or uremia and thrombocytopenia.
- #14: Nonselective beta-blockers (NSBBs) are the standard of care for the prevention of variceal bleeding in patients with cirrhosis and portal hypertension. More recently, the use of NSBB was found to be associated with a higher likelihood of PPCD(102) and shorter survival in decom- pensated cirrhosis, including patients with RA(103,104) and SBP.(105) Other publications soon followed that showed no impact of NSBB use on AKI development(106) or on mortality,(107,108) even in patients with severe liver dysfunction and those with acute-on-chronic liver fail- ure.(109) These seemingly contradictory results led to the proposal of the “window period” hypothesis, suggesting that NSBBs were only useful during a certain window of period in the natural history of cirrhosis.(110) Beyond that time, NSBB use could be detrimental.
- #15: The severity of hyponatremia with cirrhosis is graded as mild (126-135 mEq/L), moderate (120-125 mEq/L), and severe (<120 mEq/L). Most patients with cirrhosis, ascites, and hyponatremia have hypervole- mic hyponatremia; however, hypovolemic and euvole- mic hyponatremia should be considered. Most patients with cirrhosis, ascites, and hyponatremia have hypervole- mic hyponatremia; however, hypovolemic and euvole- mic hyponatremia should be considered. Hypovolemic hyponatremia can occur because of poor oral intake or from urinary or gastrointestinal losses related to an excess of diuretic or laxative treatments, respectively. Euvolemic hyponatremia is uncommon among patients with cirrhosis unless there is a specific cause, such as syndrome of inappropriate antidiuretic hormone secre- tion, medications (e.g., sertraline, carbamazepine), and severe hypothyroidism or adrenal insufficiency.
- #16: Bacterial translocation, the passage of bacteria from the gut to the bloodstream and other extraintestinal sites, together with decreased host defenses have been implicated in the pathogene- sis of these spontaneous infections. Specific microorganisms are mostly enteric (with the most common being Escherichia coli, fol- lowed by Klebsiella pneumoniae, Staphylococcus aureus, Enterococcus faecalis, and Enterococcus faecium).
- #21: AKI is common in patients with decompensated cirrhosis and ascites, with a prevalence in hospital- ized patients that ranges between 27% and 53%.(215) The development of AKI entails a poor prognosis in patients with cirrhosis, with 30-day mortality ranging from 29% to 44%. HRS is a type of AKI, known as HRS-AKI under the current termi- nology, unique to patients with cirrhosis that occurs in the absence of hypovolemia or significant abnormali- ties in kidney histology. Proposed algorithm for the diagnosis and management of AKI in cirrhosis. The key diagnostic steps include (1) clinical assessment and examination of urinary sediments and biomarkers, (2) response to risk factor management, and (3) response to albumin infusion. 1Clinical assessment includes evaluation for prerenal (e.g., overdiuresis, dehydration) or structural (e.g., shock, nephrotoxins, obstructive uropathy) etiologies. Urinary sediments and biomarkers (particularly NGAL [see Table 12]) may indicate ATN, whereas fractional excretion of sodium <1% may suggest HRS. 2Risk factor management includes the withdrawal of nephrotoxic drugs, reduction or withdrawal of diuretics, detection, and treatment of infections, if present, and volume replacement (if severely volume-depleted) using 5% albumin or crystalloids, preferentially balanced, initially. 3Patients experiencing a further rise in serum creatinine despite risk factor management may immediately proceed to the next step, namely albumin challenge. Some members of the writing group advocate taking into account the absolute creatinine value in addition to the change4in creatinine to expedite this step to allow earlier institution of vasoconstrictors in patients with a5high (e.g., >1.5 mg/dL) creatinine. These patients are expected to have ascites, commonly refractory, and almost always hyponatremia. HRS defined as described in Table 11. AIN, acute interstitial nephritis; UTI, urinary tract infection; UTO, urinary tract obstruction.
- #22: *The old terminology, type-1 HRS, has been replaced by HRS-AKI. For reference, therapeutic studies to date have used the historical definition: sudden impairment of kidney function, namely a 100% increase in serum creatinine to a value >2.5 mg/dL (221 μmol/L) within <2 weeks. †Increase in serum creatinine ≥0.3 mg/dL from baseline within 48 hours or a percent increase in serum creatinine of ≥50% which is known or presumed to have occurred within the preceding 7 days.(15)