Portal vein thrombosis: Clinical sciences

Portal vein thrombosis, or PVT for short, refers to the formation of blood clots within the portal vein that can result in partial or complete obstruction of the blood vessel. This condition is commonly associated with cirrhosis and hepatocellular carcinoma, and can result in various complications, such as esophageal and gastric varices, as well as cavernous transformation, pylephlebitis, and mesenteric ischemia.

Now, if your patient presents with a chief concern suggesting portal vein thrombosis, your first step is to perform an ABCDE assessment to determine if the patient is unstable or stable. If the patient is unstable, first stabilize their airway, breathing, and circulation. Next, obtain IV access and put your patient on continuous vital sign monitoring, including blood pressure, heart rate, and pulse oximetry. Finally, if needed, provide supplemental oxygen and ensure the patient is nil per os or NPO, meaning nothing by mouth.

Now, here’s a clinical pearl! If your patient is unstable, be sure to assess for severe complications of portal vein thrombosis, like variceal bleeding or mesenteric infarction. For variceal bleeding, consider variceal banding or sclerotherapy. In case of mesenteric infarction, immediately obtain a surgical consultation!

Now, let’s go back to the ABCDE assessment and look at stable patients. In this case, obtain a focused history and physical examination. Your patient may complain of abdominal pain, which comes and goes abruptly, and could be generalized or localized in the right upper quadrant. Other symptoms may include bloody vomit or dark, tarry stools.

The physical exam may reveal signs of portal hypertension, such as splenomegaly; or signs of cirrhosis, such as jaundice or ascites. Now, with these findings, you should suspect portal vein thrombosis.

Your next step is to order a Doppler ultrasound to assess the blood flow in the portal vein. If the Doppler ultrasound reveals normal portal vein blood flow, you should consider an alternative diagnosis.

Here’s a clinical pearl to keep in mind! A portal vein thrombus can sometimes be difficult to visualize on ultrasound. If you have a high clinical suspicion for PVT but the ultrasound does not reveal a thrombus, consider following up with a more advanced imaging modality, such as a CT, MRI, magnetic resonance portography, or contrast-enhanced ultrasound.

On the other hand, if the Doppler ultrasound shows hyperechoic material in the portal vein with impaired blood flow, you can diagnose PVT. Once you diagnose PVT, your next step is to obtain advanced imaging like an abdominal CT or MRI. This will help you to assess the size of the thrombus and liver architecture. Additionally, be sure to assess for any associated pathologies, such as cirrhosis.

First, let’s discuss what to look for when assessing our patient for cirrhosis. Individuals with cirrhosis might have a history of progressive abdominal fullness, poor appetite, weight loss, weakness, or fatigue. The physical exam may reveal features of cirrhosis, such as jaundice, palmar erythema, spider angiomata, or a distended abdomen with a fluid wave. Finally, imaging might reveal changes in the hepatic architecture or cirrhotic nodules. If this is the case, you can diagnose your patient with PVT with cirrhosis.

Here’s a clinical pearl! Some labs that may point to a patient having cirrhosis are low albumin, thrombocytopenia, and elevated coagulation studies.

Next, assess the imaging to check if there’s an associated hepatocellular carcinoma, since it’s common in patients with cirrhosis. If imaging reveals a hepatic nodule larger than or equal to two centimeters, diagnose PVT with HCC. Management will include chemotherapy medications, like sorafenib.

Here’s a clinical pearl! To confirm HCC, you can also get tumor markers like serum alfa-fetoprotein or AFP, as well as liver biopsy.