Portal Hypertension
Portal hypertension is a serious complication that develops when blood pressure rises dangerously high in the portal vein, the major vessel that carries blood from your digestive organs to your liver. This condition, most commonly caused by liver scarring from cirrhosis, can lead to life-threatening internal bleeding and other severe complications that require careful medical management.
Table of contents
- What is portal hypertension?
- Main causes
- Who develops this condition?
- Signs and symptoms
- Serious complications
- How is it diagnosed?
- Treatment approaches
- How serious is the condition?
What is portal hypertension?
Portal hypertension means elevated blood pressure in your portal vein and the smaller veins that branch off from it, together called your portal venous system[1]. The portal vein is a major blood vessel in your abdomen that collects nutrient-rich blood from your stomach, intestines, pancreas, and spleen, and carries it to your liver[1][5]. Your liver filters this blood, cleaning out toxins and processing nutrients, before sending it back to your heart and into general circulation throughout your body[1].
Under normal conditions, the pressure difference between the portal vein and other major veins remains at 5 millimeters of mercury (mm Hg) or less[2]. When this pressure gradient reaches 6 mm Hg or higher, portal hypertension is present[2]. The condition becomes clinically significant when pressure reaches 10 mm Hg or more, and serious complications typically occur when pressure rises to 12 mm Hg or above[2].
When something blocks or slows blood flow through your portal vein, pressure builds up throughout the entire portal venous system[1]. Your body tries to compensate by redirecting blood flow into other, smaller veins[1]. This extra blood makes these veins expand, and their walls stretch and weaken[1]. These enlarged veins, called varices, may leak fluid into your abdomen or rupture and bleed[1].
Main causes
The most common cause of portal hypertension is cirrhosis of the liver[1][4]. Cirrhosis refers to scarring of the liver that develops after long-term liver damage[1]. This scarring can result from alcohol abuse, viral hepatitis (such as hepatitis B or C), or other causes of liver disease[10]. The scar tissue blocks the smooth flow of blood through the portal vein running through your liver, causing pressure to rise[1].
In Western countries, cirrhosis causes most cases of portal hypertension[1]. However, in other parts of the world, particularly developing countries, a parasitic infection called schistosomiasis is a more common cause[1][7]. More than 230 million people worldwide have this infection[1].
Other less common causes include blood clots in the portal vein, blockages in the veins that carry blood from the liver to the heart, and conditions affecting the liver’s blood vessels even without cirrhosis[4][6]. Sometimes the cause cannot be identified[4].
Who develops this condition?
Portal hypertension most commonly affects people with cirrhosis and other forms of chronic liver disease[1]. Up to 90% of people with cirrhosis already have portal hypertension before they develop symptoms[1]. The condition is fairly uncommon overall but when it occurs, it most often affects older adults[5].
Signs and symptoms
You may not have any symptoms in the early stages of portal hypertension[1][7]. Symptoms typically don’t appear until complications develop[7]. Up to 40% of people with cirrhosis and portal hypertension already have large varices before they notice any problems[1].
The first noticeable symptoms are usually related to enlarged, leaky, or bleeding veins[1]. The five main symptoms to watch for include:
- Vomiting blood or having blood in your vomit
- Black, tarry stools or visible blood in your bowel movements
- Rapid weight gain with a bloated, swollen stomach (caused by fluid buildup)
- Swelling in your legs and feet, known as edema
- Mental confusion or disorientation
Additional symptoms can include an enlarged liver and spleen, yellowing of the skin and eyes (called jaundice), weight loss from poor nutrition, reduced platelet counts (affecting blood clotting), and decreased white blood cell counts (compromising your immune system)[7][13].
Serious complications
Portal hypertension can lead to several life-threatening complications[1]:
Ascites occurs when fluid from your enlarged veins leaks into your abdomen and builds up inside the cavity surrounding your organs[1]. This causes uncomfortable swelling in your abdomen and can affect your appetite and digestion[1]. In severe cases, the fluid may extend into your chest cavity and make breathing difficult[1]. Ascites also increases your risk of developing a dangerous infection in your abdominal cavity called peritonitis[1].
Gastrointestinal bleeding happens when enlarged veins in your digestive tract rupture and bleed[1]. The most dangerous type involves esophageal varices—enlarged veins in your esophagus (the tube connecting your mouth to your stomach)—which have thin walls and are close to the surface[1]. Veins in your stomach lining can also swell (a condition called portal hypertensive gastropathy) and bleed in severe cases[1]. This bleeding can lead to anemia (low red blood cell count) and can be life-threatening[1].
Hypersplenism develops when reduced blood flow through your spleen causes it to swell with excess blood and create new blood vessels[1]. An enlarged spleen can become overactive, removing too many blood cells from circulation[1]. This leads to low platelet counts (reducing your blood’s ability to clot) and low white blood cell counts (weakening your immune system)[1].
Hepatic encephalopathy is confusion and forgetfulness caused by poor liver function[4][13]. When your liver cannot properly filter toxins from your blood, these substances can affect your brain function.
How is it diagnosed?
Doctors usually diagnose portal hypertension based on physical examination findings and your medical history, particularly if you have liver disease or cirrhosis[4][7]. During a physical exam, your doctor may detect a swollen abdomen from fluid buildup or enlarged veins visible on your abdomen or around your anus[7][13].
Unfortunately, doctors cannot measure blood pressure in the portal vein with a regular blood pressure cuff[7]. Instead, several types of tests may be used:
Laboratory tests involve various blood tests[7]. A low platelet count is the most common laboratory sign of portal hypertension[7].
Imaging tests provide pictures of your liver and blood flow through it[7]. These include ultrasound and CT scans (computed tomography), which can show enlarged veins around the liver and help assess bleeding risk[7]. A widened portal vein visible on a CT scan or MRI may suggest portal hypertension[3].
Endoscopic examination involves inserting a thin, flexible tube with a camera through your mouth to view the inside of your upper digestive tract[7][13]. This allows doctors to look directly for enlarged veins in your esophagus and stomach.
Elastography measures the stiffness of your liver and surrounding tissue by pushing against it[13]. Poor elasticity may indicate liver disease.
The most accurate way to measure portal pressure involves a specialized procedure to directly measure the pressure difference between veins in and around the liver, though this is not always necessary for diagnosis[2].
Treatment approaches
Unfortunately, most causes of portal hypertension, particularly cirrhosis, cannot be reversed[4][13]. Therefore, treatment focuses on preventing complications or managing them when they occur, especially preventing and controlling bleeding from varices[4][12].
Medications play an important role in treatment[13]. Beta-blockers (a type of blood pressure medicine) can help reduce pressure in the portal vein[11][13]. Medications like propranolol and isosorbide can reduce the risk of internal bleeding[13]. If you develop fluid buildup (ascites), your doctor may prescribe diuretics to help your body eliminate excess fluid[19].
Dietary changes are often necessary[4][19]. A low-sodium diet is typically recommended, ideally limiting sodium intake to no more than 2 grams per day[4]. In some cases, protein intake may need to be monitored if confusion is a symptom[4]. Working with a dietitian can help you develop an appropriate meal plan.
Endoscopic procedures can prevent or treat bleeding from enlarged veins[11]. Endoscopic band ligation (also called variceal band ligation) uses rubber bands to block blood vessels from bleeding[13]. Sclerotherapy involves injecting a blood-clotting solution directly into varices to stop bleeding[13].
Paracentesis may be needed to drain fluid from your abdomen when ascites causes uncomfortable symptoms[19]. This procedure uses an ultrasound-guided needle to remove the fluid buildup[19]. Some patients with difficult-to-control ascites (called refractory ascites) may require frequent paracentesis procedures[19].
TIPS procedure (Transjugular Intrahepatic Portosystemic Shunt) may be recommended for certain patients[17]. This procedure creates a new passageway, or shunt, in the liver by placing a metal tube[17]. The shunt allows blood to flow more easily through the liver, relieving high pressure and helping reverse portal hypertension and its complications[17]. TIPS is often considered for patients with refractory ascites requiring multiple paracentesis procedures or with bleeding varices[17][19].
Liver transplantation may be necessary in severe cases[13]. This involves surgically removing the diseased liver and replacing it with a healthy donor liver[13]. Many patients with portal hypertension may be evaluated for liver transplant, particularly when ascites develops, as this often indicates advanced liver disease[19].
How serious is the condition?
Portal hypertension is one of the most serious complications of advanced liver disease[1]. The complications can be life-threatening, especially internal bleeding[1]. Not everyone will develop these complications, but the risk increases as portal pressure rises[1]. The greater the pressure, the more enlarged your veins become and the more likely they are to rupture[1].
Portal hypertension is the most common cause of hospitalization and death in people with cirrhosis[1]. Among patients with cirrhosis, complications from portal hypertension—such as ascites, variceal bleeding, and hepatic encephalopathy—account for the most common reasons for hospitalization, the need for liver transplantation, and mortality[2].
If you have liver disease that could lead to cirrhosis, the chance of developing portal hypertension is high[4]. Early diagnosis and careful medical management are essential to prevent or control complications and improve outcomes.
