What causes constrictive pericarditis?

Written by Han Shun Li
Pulmonology
Updated on September 05, 2024
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Constrictive pericarditis refers to the fibrosis or calcification of the pericardium, which restricts the filling of the ventricles during diastole and leads to a series of symptoms. What causes constrictive pericarditis? Generally, constrictive pericarditis is secondary to acute pericarditis. In our country, the most common cause of constrictive pericarditis is tuberculous pericarditis, followed by purulent or traumatic pericarditis. A minority of constrictive pericarditis cases may be associated with tumors of the pericardium, acute nonspecific pericarditis, and radiation-induced pericarditis, among others. Of course, some patients have idiopathic constrictive pericarditis.

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Symptoms of Acute Pericarditis

Acute pericarditis is not a common disease in daily life. What symptoms or clinical manifestations will appear after someone develops acute pericarditis? The clinical manifestations are mainly reflected in the following aspects: First, patients often experience chest pain and shortness of breath, and this pain often has a certain relationship with breathing. Second, the electrocardiogram often shows changes with ST segment elevation. Third, during a physical examination, doctors can often hear pericardial friction rub, or may feel the sensation of pericardial friction. Based on these symptoms and signs, doctors often make a diagnosis of acute pericarditis.

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Early symptoms of acute pericarditis

The early symptoms of acute pericarditis are pain, which is located behind the sternum or in the precordial area, typically seen in the fibrin exudative type of inflammation. This pain arises from the friction between the visceral pericardium and the parietal pericardium. The nature of the pain is very sharp and related to respiratory movement, commonly exacerbated by coughing, deep breathing, or swallowing. The pain can radiate to the neck, left shoulder, and left arm. As fluid accumulates in the pericardium and the two layers of the pericardium separate, the pain may decrease or disappear.

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How is constrictive pericarditis treated?

We say constrictive pericarditis refers to a disorder of circulatory disturbances caused by the heart being encased in a densely thickened fibrotic or calcified pericardium, which restricts the filling of the ventricles during diastole. Most patients with constrictive pericarditis will progress to chronic constrictive pericarditis. At this point, the only effective treatment method is pericardiectomy, but the perioperative risk is very high. A small portion of patients have short-term or reversible pericardial constriction, so for patients who are recently diagnosed and have stable conditions, it is possible to try anti-inflammatory treatment for 2-3 months unless complications such as cardiac cachexia, cardiogenic cirrhosis, or myocardial atrophy occur. For tuberculous pericarditis, anti-tuberculosis treatment is recommended to delay the progression of pericardial constriction, and post-surgery, anti-tuberculosis treatment should continue for one year.

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Symptoms of acute pericarditis

Acute pericarditis is an acute inflammatory disease of the visceral and parietal layers of the pericardium, with the most common cause being viral infections. The hallmark of acute pericarditis is pain in the precardiac area behind the sternum. The nature of the pain is very sharp, typically occurring during the fibrinous exudation phase of inflammatory changes, caused by friction between the visceral and parietal layers of the pericardium. The pain can radiate to the neck, left shoulder, and even the upper abdomen. It is associated with respiratory movements and often worsens with coughing, deep breathing, or changing body positions. When fluid exudes into the pericardium, separating the visceral and parietal layers, the patient's pain may decrease or disappear. However, some patients may experience symptoms such as breathing difficulties and edema due to cardiac tamponade.

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What are the clinical considerations for acute pericarditis?

The treatment and prognosis of acute pericarditis mainly depend on the cause, and are also related to whether it is diagnosed and treated correctly early on. For various types of pericarditis, if constrictive syndrome occurs, pericardiocentesis should be performed immediately to relieve symptoms. In cases like tuberculous pericarditis, if not treated aggressively, it can usually progress to chronic constrictive pericarditis. Acute nonspecific pericarditis and post-cardiac injury syndrome may lead to recurrent attacks of pericarditis after the initial episode, known as recurrent pericarditis, with an incidence rate of about 20%-30%. This is one of the most difficult complications of acute pericarditis to manage. Clinically, it generally presents similar to acute pericarditis, with recurrent attacks months or years after the initial episode, accompanied by severe chest pain. Most patients should be treated again with high doses of non-steroidal anti-inflammatory drugs, slowly tapering over several months until the medication can be stopped. If ineffective, corticosteroid treatment may be administered; in severe cases, intravenous methylprednisolone may be given, and symptoms in most patients may improve within a few days. However, it is important to note that symptoms often reappear during steroid tapering.