β-blockers and refractory ascites in cirrhosis: the message of a team of true scientists

NON-SELECTIVE BETA-BLOCKERS IN CIRRHOTIC PATIENTS WITH REFRACTORY ASCITES: WHERE ARE WE?

BACKGROUND

The established use of non-selective beta-blockers (NSBB) in the primary and secondary prevention of esophageal varices has recently been questioned in the subgroup of patients with diuretic-refractory ascites.

OBJECTIVE

Critically analyze the body of evidence on the topic in order to assist clinical decisions.

METHODS

A literature review was carried out in the Pubmed® and Scielo® databases. In total, 20 articles between 2010 and 2023 were read by independent researchers.

CONCLUSION

It remains doubtful whether the use of NSBB is deleterious in cirrhotic patients with refractory ascites, however our literature review allows us to conclude that these drugs should not be proscribed in these patients. On the contrary, a doctor-patient decision based on tolerability and hemodynamic parameters certainly seems to be a safe conduct.

Cardiac dysfunction in patients with cirrhosis: is the systolic component its main feature?

OBJECTIVE

To investigate the subclinical cardiac morphological and functional modifications in cirrhotic patients according to the stage of liver disease.

PATIENTS AND METHODS

One hundred and thirteen cirrhotic patients underwent standard Doppler echocardiography and were compared with healthy individuals. Left ventricular (LV) geometry, systolic/diastolic function, and the main hemodynamic parameters were assessed according to current guidelines.

RESULTS

Cirrhotic patients showed a reduction in the peripheral vascular resistance (PVR), a compensatory hyperdynamic syndrome, and a significant increase in cardiac index (CI), cardiac output (CO), and cardiac work, with a consequent increase in the prevalence of LV hypertrophy and associated diastolic dysfunction (DD). Age (P=0.005) and LV mass index (P=0.03) were the strongest predictors of DD. Even though all the systolic parameters assessed were similar between patients and controls, in patients with refractory ascites, the reduction of the PVR and mean blood pressure was not balanced by a further increase in cardiac work and therefore the CI and CO were supported only by the increase in heart rate.

CONCLUSION

In cirrhotic patients, DD is strongly related to the increase in LV mass, not related to the stage of the liver disease, and can be correctly detectable only by the use of tissue Doppler imaging. For systolic dysfunction, along with the development and worsening of ascites, CO and CI do not increase further to compensate the continuous reduction of PVR and mean blood pressure, and their maintenance becomes critically dependent on the heart rate, thus suggesting a possible detrimental effect of β-blockers in these patients.

Beta-blockers in cirrhosis and refractory ascites: a retrospective cohort study and review of the literature

OBJECTIVE

It is currently discussed if beta-blockers exert harmful effects and increase mortality in patients with cirrhosis and refractory ascites. In this study, we provide an overview of the available literature in this field in combination with a retrospective analysis of 61 patients with cirrhosis and refractory ascites in a tertiary unit.

MATERIAL AND METHODS

We performed a systematic search of literature in May 2014. In addition, 61 patients with cirrhosis and ascites were identified and followed from development of refractory ascites until death or end of follow-up.

RESULTS

Fourteen trials (9 trials on propranolol, 1 case-control study and 4 retrospective analyses) were identified. One trial suggested an increased mortality in patients treated with beta-blockers and refractory ascites. The results of the remaining trials were inconclusive. No increase in mortality among beta-blocker-treated patients was found in the present retrospective analysis.

CONCLUSIONS

Treatment with beta-blockers may increase mortality in patients with cirrhosis and refractory ascites. However, the current evidence is sparse and high-quality studies are warranted to clarify the matter.

Zolmitriptan: a novel portal hypotensive agent which synergizes with propranolol in lowering portal pressure

OBJECTIVE

Only a limited proportion of patients needing pharmacological control of portal hypertension are hemodynamic responders to propranolol. Here we analyzed the effects of zolmitriptan on portal pressure and its potential interaction with propranolol.

METHODS

ZOLMITRIPTAN, PROPRANOLOL OR BOTH WERE TESTED IN TWO RAT MODELS OF PORTAL HYPERTENSION: common bile duct ligation (CBDL) and CCl4-induced cirrhosis. In these animals we measured different hemodynamic parameters including portal venous pressure, arterial renal flow, portal blood flow and cardiac output. We also studied the changes in superior mesenteric artery perfusion pressure and in arterial wall cAMP levels induced by zolmitriptan, propranolol or both. Moreover, we determined the effect of splanchnic sympathectomy on the response of PVP to zolmitriptan.

RESULTS

In both models of portal hypertension zolmitriptan induced a dose-dependent transient descent of portal pressure accompanied by reduction of portal flow with only slight decrease in renal flow. In cirrhotic rats, splanchnic sympathectomy intensified and prolonged zolmitriptan-induced portal pressure descent. Also, propranolol caused more intense and durable portal pressure fall when combined with zolmitriptan. Mesenteric artery perfusion pressure peaked for about 1 min upon zolmitriptan administration but showed no change with propranolol. However propranolol enhanced and prolonged the elevation in mesenteric artery perfusion pressure induced by zolmitriptan. In vitro studies showed that propranolol prevented the inhibitory effects of β2-agonists on zolmitriptan-induced vasoconstriction and the combination of propranolol and zolmitriptan significantly reduced the elevation of cAMP caused by β2-agonists.

CONCLUSION

Zolmitriptan reduces portal hypertension and non-selective beta-blockers can improve this effect. Combination therapy deserves consideration for patients with portal hypertension failing to respond to non-selective beta-blockers.

Improving survival in decompensated cirrhosis

Mortality in cirrhosis is consequent of decompensation, only treatment being timely liver transplantation. Organ allocation is prioritized for the sickest patients based on Model for End Stage Liver Disease (MELD) score. In order to improve survival in patients with high MELD score it is imperative to preserve them in suitable condition till transplantation. Here we examine means to prolong life in high MELD score patients till a suitable liver is available. We specially emphasize protection of airways by avoidance of sedatives, avoidance of Bilevel Positive Airway Pressure, elective intubation in grade III or higher encephalopathy, maintaining a low threshold for intubation with lesser grades of encephalopathy when undergoing upper endoscopy or colonoscopy as pre transplant evaluation or transferring patient to a transplant center. Consider post-pyloric tube feeding in encephalopathy to maintain muscle mass and minimize risk of aspiration. In non intubated and well controlled encephalopathy, frequent physical mobility by active and passive exercises are recommended. When renal replacement therapy is needed, night-time Continuous Veno-Venous Hemodialysis may be useful in keeping the daytime free for mobility. Sparing and judicious use of steroids needs to be borne in mind in treatment of ARDS and acute hepatitis from alcohol or autoimmune process.