Place in the classification of myocardial infarction complications
Post-myocardial infarction Dressler's syndrome belongs to the group of inflammatory and autoimmune complications of myocardial infarction (MI).
It is important to distinguish it from early infarction-associated pericarditis. Early pericarditis occurs as early as the 2nd–4th day of the disease, is a sign of extensive necrosis (most often of the anterior wall), and is accompanied by a pericardial friction rub. Dressler's syndrome, however, develops much later (in 2–3 weeks) and has a completely different, autoimmune mechanism of development.
Currently, the incidence of Dressler's syndrome does not exceed 1%. This reduction in morbidity is directly related to modern standards of MI treatment—the widespread use of early reperfusion methods (percutaneous coronary intervention and thrombolysis).
Pathogenesis of systemic inflammation
During myocardial necrosis, structural proteins of the heart muscle enter the bloodstream and are perceived by the immune system as foreign. Autoimmune aggression (aseptic inflammation) is triggered.
Mechanism of serous membrane involvement (pleura and pericardium):
- Aseptic inflammation causes a massive release of mediators (cytokines and prostaglandins).
- There is a significant increase in the permeability of the pleural and pericardial capillaries.
- Cellular proliferation, fluid exudation into the cavities, or fibrin deposition on the surface of the serous leaves develops.
As a result, the pericardium and pleura thicken due to edema and fibrinous exudate.
Clinical presentation and classical triad
Post-myocardial infarction Dressler's syndrome is characterized by the classical triad of manifestations:
- Pericarditis (inflammation of the pericardium).
- Pleuritis (inflammation of the pleural leaves).
- Pneumonitis (aseptic pneumonia).
In addition to the triad, the systemic autoimmune reaction can lead to joint and muscle involvement.
Features of pleuritis in Dressler's syndrome: Pleural inflammation can occur in two variants:
- Dry (fibrinous) pleuritis: accompanied by acute, stabbing pain in the lower lateral chest, which worsens with breathing, coughing, and leaning toward the healthy side. The patient breathes shallowly and complains of a dry, painful cough.
- Exudative pleuritis: characterized by fluid accumulation in the pleural cavity, lung compression, and the development of dyspnea.
Clinical nuance (infarction masks): In patients with a silent (painless) form of myocardial infarction, the development of complications such as severe arrhythmias, pulmonary edema, or manifestations of Dressler's syndrome may become the main and only clinical manifestation of the past cardiac event.
Instrumental diagnostics (imaging methods)
Since Dressler's syndrome presents with the clinical picture of acute non-infectious pericarditis, imaging methods are used to visualize it:
- Echocardiography (EchoCG) and CT: the most frequent manifestation is pericardial effusion (pericardial effusion).
- MRI: in spin-echo mode (spin-echo MRI), the thickened inflamed pericardium gives a moderate to high-intensity signal.
- CT and MRI with contrast enhancement: characterized by contrast agent accumulation by the inflamed pericardium (pericardial enhancement), which is especially well visible on delayed scans in contrast-enhanced CT.
The classic picture of Dressler's syndrome is the rule of three "P"s: Pericarditis, Pleuritis, Pneumonitis. It appears after 2–3 weeks (the number 3 links the timing and the number of main symptoms).
Class and exam questions
What is the main difference between Dressler's syndrome and early post-infarction pericarditis?
Early pericarditis occurs on days 2–4 and is a direct consequence of extensive necrosis involving the epicardium. Dressler's syndrome develops in 2–3 weeks and has an autoimmune nature.
Why is Dressler's syndrome currently rare?
Its incidence has dropped to 1% or less due to the introduction of early reperfusion methods (percutaneous coronary intervention and thrombolysis) into practice, which limit the necrosis zone.
What blood test changes are characteristic of Dressler's syndrome?
In addition to general signs of inflammation, the systemic autoimmune reaction in this syndrome is often accompanied by eosinophilia in a complete blood count.
What else to study on this topic
- Early infarction-associated pericarditis and its differential diagnosis with MI recurrence
- Mechanical complications of acute myocardial infarction (ruptures, aneurysms)
- Pathogenesis and classification of pleuritis by exudate type
- Thromboembolic complications of MI and sources of thrombi
- Constrictive pericarditis: pathophysiology and differential diagnosis with restrictive cardiomyopathy
Master the entire topic in the "Pathophysiology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete study guide on "Dressler's syndrome" and another 4,913 pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 135 video lessons on the subject
Free video lessons: pathophysiologyShort lessons with lecture notes — no registration required.
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.