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Pericarditis is defined as inflammation of the pericardium. It is normally found in association with cardiac, thoracic or wider systemic pathology and it is unusual to manifest on its own.
The diagnosis of pericarditis is based on clinical criteria and supplemental imaging information 1.
According to the 2015 European Society of Cardiology (ESC) Guidelines for the diagnosis and management of pericardial diseases the diagnosis can be made if ≥2 of the following four criteria are met 1:
pericarditic chest pain
new widespread ST elevation and/or PR depression (ECG)
new or worsening pericardial effusion
Supporting findings include the following:
imaging findings on cardiac CT or cardiac MRI suggesting pericardial inflammation
Classically, patients present with abrupt, pleuritic, positional left precordial chest pain after a viral prodrome. The pain is relieved in the sitting position when leaning forward and exacerbated when supine. Tuberculous pericarditis may present with constitutional symptoms, including fever, night sweats, anorexia, and weight loss. The physical exam may demonstrate:
a pericardial friction rub
classically triphasic, two components in diastole and one in systole
may be transient
signs of tamponade
diffuse ST-segment elevation (STE)
with upward concavity
the STE in lead II > lead III
absence of reciprocal changes or Q waves
lead aVR demonstrates ST-segment depression
this lead also may demonstrate PR segment elevation
diffuse PR segment depression
excluding the aforementioned (lead aVR)
later, T-wave inversions may develop
In general, infection is the most common cause of pericarditis. Infection accounts for two-thirds of cases while noninfectious causes account for the remaining one-third 9.
Pericarditis can be divided into subtypes according to morphology:
There may be an increased cardiothoracic ratio (CTR) with a globular or 'flask-shaped' outline if there is co-existing pericardial effusion. Manifestations of cardiogenic pulmonary edema may also be present.
Echocardiography is recommended when the pericardial disease is suspected and may demonstrate 11:
indication for hospitalization when new and large
elevated filling pressures
Patients who have a preserved ejection fraction but symptomatic heart failure may (with a suggestive clinical history) be examined for occult constrictive pericarditis, features of which include:
mitral/tricuspid inflow pulsus paradoxus
in the absence of an effusion
elevated filling pressures with a preserved mitral septal annular velocity (septal e')
tissue Doppler of the mitral annuli reveals a septal e' > lateral e'
the lateral e' is normally always higher than the septal e'
At contrast-enhanced CT, enhancement of the thickened pericardium generally indicates inflammation 1.
Usually, GRE cine, T1, T2 black-blood/STIR and IR GRE sequences are performed. In the setting of suspected pericardial constriction, real-time cine sequences should be acquired 12,13. The presence of an arrhythmia may induce artefacts. For specific features please refer to subtype articles.
The normal pericardial thickness is considered 2 mm while a thickness of over 4 mm suggests a pericarditis 2,3.
Edema of the visceral and parietal pericardium, depicted in T2 black-blood/STIR images, and enhancement usually assessed with late gadolinium enhancement (LGE) images are additional specific MRI features 12-14.
In addition, cardiac MRI has the ability to assess the myocardium regarding concomitant myocarditis and viability in a post-myocardial infarction setting or to detect myocardial infarction, if previously unknown.
Focal FDG uptake may be demonstrated in some cases.