Portal hypertensive bleeding in cirrhosis

This guidance provides a data-supported approach to risk stratification, diagnosis, and management of patients with cirrhosis and portal hypertension (PH). A guidance document is different from a guideline. Guidelines are developed by a multidisciplinary panel of experts who rate the quality (level) of the evidence and the strength of each recommendation using the Grading of Recommendations Assessment, Development, and Evaluation system. A guidance document is developed by a panel of experts in the topic, and guidance statements, not recommendations, are put forward to help clinicians understand and implement the most recent evidence. This guidance focuses on PH, varices, and variceal hemorrhage (VH), and statements are based on the following: (1) review of the recent literature using PubMed, giving more weight to large, well-designed, prospective trials and well-performed meta-analyses; (2) several consensus conferences among experts; and (3) the authors' years of experience caring for patients with cirrhosis and varices. Management of ascites and encephalopathy is addressed in other documents. When little or no data exist from well-designed, prospective trials, emphasis is given to results from large series and reports from recognized experts. In this case, clinical studies needed to clarify that management are specified in a section on future research. Practice guidelines for the diagnosis and treatment of gastroesophageal VH were published in 2007, endorsed by the American Association for the Study of Liver Diseases (AASLD), American College of Gastroenterology, American Gastroenterological Association, and American Society of Gastrointestinal Endoscopy (ASGE).1 Since then, a number of randomized, controlled trials (RCTs) have advanced our approach to managing VH. Additionally, four international consensus conferences were held since then, where experts in the field evaluated the changes in pathophysiology, diagnosis, and management of varices and VH. These include two AASLD/European Association for the Study of the Liver single-topic conferences in 2007 (many of the recommendations from this conference were incorporated into the aforementioned guidelines)2 and in 2013, and two Baveno consensus conferences in 20103 and in 2015.4 In this updated practice guidance, recommendations derived from these consensus conferences were also incorporated, particularly those from the latest Baveno conference that took place in Baveno, Italy, in April 2015. Perhaps the most relevant change in these recommendations has been the recognition of the different stages of cirrhosis,5 so that recommendations are now focused on risk stratification and individualizing care for PH. Intended for use by health care providers, this guidance identifies preferred approaches to the diagnostic, therapeutic, and preventive aspects of care of patients with PH. As with other guidance documents, it is not intended to replace clinical judgment, but rather to provide general guidance applicable to the majority of patients. They are intended to be flexible, in contrast to formal treatment recommendations or standards of care, which are inflexible policies designed to be followed in every case. Clinical considerations may justify a course of action that differs from this guidance. Cirrhosis is a chronic condition with a high mortality. It constitutes the fifth-leading cause of adult deaths and ranks eighth in economic cost among the major illnesses.6 Cirrhosis is a heterogeneous disease that cannot be studied or managed as a single entity and is classified in two main prognostic stages: compensated and decompensated cirrhosis.5, 7 This classification depends on the presence or absence of clinically evident decompensating events (specifically ascites, VH, and encephalopathy HE), with a median survival in the compensated stage that exceeds 12 years, whereas it is only 1.8 years in patients who develop decompensation.8 The Child-Turcotte-Pugh (CTP) classification has been used to stratify patients with cirrhosis. Patients with cirrhosis belonging to the CTP-A class are compensated, whereas those in the CTP-B/C class are mostly decompensated. PH is the initial and main consequence of cirrhosis and is responsible for the majority of its complications. In fact, it has been shown that portal pressure (PP), determined by the hepatic venous pressure gradient (HVPG), is better than liver biopsy in predicting development of complications of cirrhosis in patients with chronic liver disease (CLD) without cirrhosis on liver biopsy.9 Therefore, a new entity denominated compensated advanced chronic liver disease (cACLD) has been proposed, emphasizing that PH may occur before a formal anatomical diagnosis of cirrhosis is established.4 This entity would encompass patients with cirrhosis and those with advanced liver fibrosis with PH (HVPG > 5 mm Hg). For ease of understanding, in the rest of this guidance, the entity of cACLD will be referred to as compensated cirrhosis (CC), both terms being interchangeable and acceptable by consensus.4 The stage of CC is asymptomatic, and it is the longest stage. Pathophysiological mechanisms are evolving at this stage, and therefore several substages are being recognized. Based on PP, patients with CC can be divided into those with mild PH (HVPG > 5 but 20 mm Hg, which is mostly observed in patients belonging to the CTP-C class.26, 27 If untreated, recurrent VH occurs in 60% of patients, usually within 1-2 years of index hemorrhage.28 Obesity and alcohol use are associated conditions of prognostic relevance in patients with cirrhosis, independent of etiology. Obesity has been shown to predict worsening of liver fibrosis, cirrhosis decompensation, and lack of regression of cirrhosis in patients with viral cirrhosis,29-31 whereas even moderate alcohol intake can lead to worsening PP and has been shown to worsen prognosis of hepatitis C virus (HCV)- and nonalcoholic steatohepatitis (NASH)-related cirrhosis.32, 33 Therefore, although beyond the scope of this guidance, weight loss and alcohol abstinence are important considerations in patients with cirrhosis. PP increases initially as a consequence of an increased intrahepatic resistance to portal flow attributed to structural mechanisms (e.g., fibrous tissue, vascular distortion from regenerative nodules, and microthrombi; Fig. 2). This "structural" component, which explains around 70% of the increased intrahepatic resistance, could be targeted by treating the etiology of cirrhosis, the use of antifibrotic agents, and even anticoagulants.34 However, at least one third of the increased intrahepatic resistance is attributed to an increased intrahepatic vascular tone, which, in turn, is attributed to endothelial dysfunction resulting mostly from reduced nitric oxide (NO) bioavailability.35 This "functional" component is amenable to vasodilators (such as nitrates, alpha-adrenergic antagonists, and angiotensin-2 blockers).36 These drugs should not be used alone, given that they also cause systemic vasodilatation, decrease arterial blood pressure, and may worsen sodium retention. A conceptually more appealing approach to ameliorate the functional component is to use drugs that will reduce PP by improving endothelial dysfunction, such as statins.37 An added advantage of these drugs is that, by causing intrahepatic vasodilatation, they may improve hepatic blood flow and liver function. Statins in particular also have antifibrotic properties.34 Pathogenesis of PH and sites of action of currently recommended therapies to reduce PP or obliterate varices. In cirrhosis, PP increases initially as a consequence of an increased intrahepatic resistance to portal flow attributed to structural mechanisms (e.g., fibrous tissue, regenerative nodules) and an increased intrahepatic vascular tone (functional component). One of the initial consequences of PH is the formation of portosystemic collaterals. Concomitant or even preceding development of collaterals, splanchnic vasodilatation occurs, leading to increased flow into the gut and into the portal venous system. Vasodilation leads to activation of neurohumoral and vasoconstrictive systems, sodium and water retention, increased blood volume, and increased cardiac output; that is, a hyperdynamic circulatory state that further increases portal venous inflow and PP. Additionally, activated vasoconstrictive systems to further contribute to intrahepatic vasoconstriction. Treatment of etiology, by ameliorating fibrosis/inflammation, target the mechanical component of the increased intrahepatic resistance. Vasodilators (like the α-adrenergic blocking effect of carvedilol) target its functional component (this is the site of action of statins). NSBBs (β2-adrenergic blocking effect), SMT, and VP act by causing splanchnic vasoconstriction, thereby reducing portal venous inflow. NSBBs also act by decreasing cardiac output (β1-adrenergic blocking effect). The TIPS connects the hypertensive portal vein with a normotensive hepatic vein, thereby bypassing the site of increased resistance. Varices can be obliterated either endoscopically (EVL or cyanoacrylate injection) or by an endovascular approach (BRTO). One of the initial consequences of PH is the formation of portosystemic collaterals, the most important being those that develop through the coronary and/or short gastric veins and constitute GEV. Although formation of collaterals had been assumed to be the result of dilatation of preexisting vascular channels, research studies have implicated a process of neoangiogenesis.38 Concomitant or even preceding the development of collaterals, splanchnic vasodilatation occurs, leading to increased flow into the gut and into the portal venous system. Therefore, even when portal flow is entirely diverted through collaterals, PH persists.39 Increased splanchnic NO production is the main factor that leads to vasodilatation and increased splanchnic blood flow. Hyperglucagonemia and neoangiogenesis further contribute to the increased splanchnic blood flow that maintains the portal hypertensive state.38 Vasodilation occurs not only in the splanchnic, but also in the systemic circulation (manifested clinically as arterial hypotension), leading to activation of neurohumoral and vasoconstrictive systems, sodium and water retention, increased blood volume, and increased cardiac output, that is, a hyperdynamic circulatory state that further increases portal venous inflow and PP. Additionally, norepinephrine, angiotensin-2, and antidiuretic hormone (activated neurohumoral and vasoconstrictive systems) further contribute to intrahepatic vasoconstriction. Drugs that act by causing splanchnic vasoconstriction, such as non-selective beta-blockers (NSBBs; propranolol, nadolol, and carvedilol), vasopressin (VP), and its analogue, terlipressin, and somatostatin (SMT) and its analogues (octreotide, vapreotide) are known to reduce PP and constitute the current mainstay in the treatment of varices and VH. Given that these drugs act by decreasing flow to the splanchnic circulation and liver, an improvement in liver function would not be expected. β-1 adrenergic blockade decreases portal flow through a decrease in cardiac output, and β-2 blockade decreases portal flow through splanchnic vasoconstriction by unopposed α-adrenergic activity. Therefore, it is essential that beta-blockers used in the treatment of PH be nonselective. Importantly, the effect of NSBBs in decreasing flow is more related to their β-2 blocking effect rather than to their β-1 effect40 and explains the lack of correlation between decreases in PP and decreases in heart rate.41 Carvedilol, an NSBB with anti-α1 adrenergic (vasodilator) activity, acts as an NSBB decreasing portal flow, but also acts as a vasodilator (intrahepatic circulation). HVPG response is greater with carvedilol than with propranolol or nadolol, but, given its vasodilatory properties, carvedilol is associated with a greater decrease in mean arterial pressure (MAP).42 It has been recently shown that patients with mild PH (HVPG > 5 but 5 but 12 mm Hg identifies bleeding risk, mostly because there is clear evidence that shows that reducing the HVPG to levels of 12 mm Hg or below is associated with protection from variceal hemorrhage (VH).28 An HVPG > 16 mm Hg indicates a higher risk of death.46 As mentioned previously, an HVPG ≥20 mm Hg predicts failure to control bleeding, early rebleeding, and death during acute VH,27, 47 and in patients with cirrhosis awaiting liver transplantation, each 1-mm-Hg increase in HVPG predicts a 3% increase in the risk of death in a median follow-up of 19 months.48 Despite the crucial role of HVPG in the determination of CSPH and other outcomes, HVPG measurements require specific expertise, are invasive, relatively expensive, and not available in all centers. Therefore, HVPG measurements are not considered standard of care for every patient with cirrhosis, particularly because noninvasive or surrogate indicators are increasingly utilized at most centers. In a step-wise diagnostic approach, specific signs of PH should be first looked for on physical examination. They include spider nevi or visible abdominal portosystemic collaterals. The absence of physical signs cannot be used to rule out CSPH. Among laboratory data, a low platelet count is the most common laboratory sign of PH; it correlates slightly with HVPG and with the presence of GEV. However, taken alone, it is not to either or CSPH or GEV. the other the of platelet count with other noninvasive the noninvasive diagnosis of provides and evidence of associated with cirrhosis and PH. The presence of circulation on or vein, and left and short gastric veins) or the of a of flow within the portal is specific for and is to CSPH. other signs of PH have been such as dilatation of portal vein and the of portal vein (or their as index of the portal Although taken is a but sign of PH, the size of the should be when with platelet count and liver it provides data on the presence of The to assess liver a physical of liver by the of liver fibrosis has a major in this by has for patients with and without CSPH, with a mean the of in a recent on studies and can be currently considered the of the noninvasive diagnosis of PH. However, most of the data have been in patients with viral cirrhosis and cirrhosis. other and data in patients who have require further studies have shown that the best to CSPH is with a diagnostic over In a prospective HVPG ≥10 mm Hg and were in predicting In a large an size count > specific in in CSPH with a of Importantly, these have to be considered in the context of clinical In this a recent prospective a based on measurements in the context of the presence of and/or a platelet count and the of patients with CC in CSPH would be more by has been recently as a more related to PH, with In fact, > better than and to HVPG in predicting first clinical decompensation in one However, cannot be by without a and cannot be if the is not Therefore, measurements by cannot be recommended in clinical direct of the liver and is but and results with higher and in the of CSPH. is an that provides data on and of much of the liver and compared to Although has been shown to be in the staging of liver data its diagnostic in the diagnosis of CSPH are with one that determined by of clinical decompensation in patients with studies are needed in this the presence and size of varices and presence of red wale marks an and that is not free of studies have looked for noninvasive of the presence of varices varices, those so as to the need for The of in predicting the presence of GEV is between and and the use of to GEV is not However, are to rule out varices in patients with In with platelet count identifies patients at low risk of These data have been mostly from patients with viral cirrhosis. in patients with cirrhosis, liver disease, and in those with cirrhosis response are consensus among and review of the it that patients with CC with by and a platelet count were to have varices and could be in studies have these and that of can be In patients with cirrhosis secondary to hepatitis an size count < in out this can be to patients with cirrhosis attributed to other to be Because measurements of are more with of this is a in and out varices and to other in data in and American patients are Patients without evidence of CSPH should be to of the if data on this specific are data from published that and platelet count could be The of new portosystemic collaterals during follow-up has been shown to be associated with variceal formation and as is Therefore, when for evidence of worsening PH should be Patients without varices on constitute an of given that their has not yet been particularly with the of therapies that the that if liver is (e.g., in and lack of in and/or of disease are present (e.g., should be repeated at in the absence of are considered Although there are no data to if several of are for varices. In patients with small varices on who are not for primary is It has been that if the liver is (e.g., in and lack of in and/or of disease are present (e.g., should be repeated at in the absence of are considered Because development of decompensation could worsening of PH and liver dysfunction with a higher of cirrhosis, patients with no or small varices on should have a when and if decompensation in HVPG, or during have been shown to be of In patients with a of VH, a decrease in HVPG to than 12 mm Hg or a decrease greater than from the risk of recurrent ascites, and In patients with CC, in HVPG from have been associated with a in development of varices,10 first VH, and studies that the need for HVPG to assess response to therapy can be by the acute response to propranolol during a single but this further there have been no (e.g., that with changes in As mentioned above, therapy of varices and VH should be to the different clinical stages of cirrhosis and PH that are shown in Table 1. The of therapy for patients at an early stage is to the development of stages. Varices and VH should be managed in the context of the presence (or of other complications of (e.g., ascites, and therefore the or of the patient with should be considered in the of the different In the compensated the is to that is, the is not only to varices or VH, but also to the other complications of cirrhosis. In to specific therapies that will be below, in the compensated every should be taken to the and to associated such as and liver given that these in can decrease portal pressure and reduce the risk of This stage is defined by an HVPG but < 10 mm Hg. Patients in this stage not have varices or