Ischemic heart disease can lead to a range of acute and chronic complications, significantly affecting both prognosis and quality of life.
These complications arise mainly from myocardial injury caused by reduced coronary blood flow, as well as from the resulting inflammatory and fibrotic response.
Acute Complications
Acute complications occur in the early phases of an ischemic event and require immediate treatment to prevent fatal outcomes.
Malignant Arrhythmias
Myocardial ischemia alters the membrane potential of cardiac cells, promoting the establishment of electrical re-entry circuits and the development of ventricular arrhythmias.
ATP depletion impairs the function of ion channels, predisposing to electrical instability.
As a result, the following rhythm disturbances may occur:
Ventricular tachycardia and fibrillation: main cause of sudden cardiac arrest in the acute phases of myocardial infarction.
Bradyarrhythmias: atrioventricular block and sinoatrial node dysfunction, especially in inferior infarctions.
Cardiogenic Shock
Extensive myocardial necrosis drastically reduces the contractile capacity of the left ventricle, resulting in a drop in cardiac output.
Systemic hypoperfusion triggers adrenergic compensatory mechanisms which, however, worsen oxygen consumption and aggravate the hemodynamic state.
The typical clinical manifestations of cardiogenic shock include:
Severe systemic hypoperfusion with hypotension and reduced organ perfusion.
Oliguria and altered mental status due to insufficient renal and cerebral perfusion.
High mortality without prompt intervention with inotropic drugs and mechanical support.
Free Wall Rupture and Ventricular Septal Rupture
Transmural infarction with extensive myocardial necrosis compromises the structural integrity of the heart; the lack of effective extracellular matrix repair predisposes to rupture of the ventricular wall or interventricular septum.
These structural complications lead to:
Free wall rupture: results in cardiac tamponade with hemodynamic collapse.
Ventricular septal rupture: causes a left-to-right shunt with acute heart failure.
Acute Valvular Insufficiency
Ischemia may impair the function of the papillary muscles, resulting in acute mitral valve incompetence.
Acute regurgitation leads to a sudden volume overload of the left ventricle with rapid hemodynamic deterioration.
This condition presents with:
Acute pulmonary edema secondary to increased left atrial pressure.
Reduced cardiac output with systemic hypoperfusion.
Possible indication for emergency surgical intervention.
Chronic Complications
Following an acute ischemic event, long-term complications may develop that impair cardiac function.
Chronic Heart Failure
The loss of viable myocardial tissue reduces ejection fraction, leading to pulmonary venous hypertension and unfavorable ventricular remodeling.
Chronic neurohormonal activation (renin-angiotensin-aldosterone system and sympathetic nervous system) accelerates the progression of heart failure.
The main signs of chronic heart failure are:
Exertional dyspnea and reduced exercise tolerance.
Peripheral edema and pulmonary congestion.
Need for therapy with ACE inhibitors, beta-blockers, and diuretics.
Ventricular Aneurysm
Post-infarction scarring may lead to the formation of a segmental area of dyskinesia, with progressive dilation and loss of contractile function.
The main consequences of this condition include:
Reduced ejection fraction with symptoms of heart failure.
Risk of thromboembolism due to blood stasis in the ventricular cavity.
Possible surgical indication in cases of high embolic risk.
Dressler’s Syndrome
This is an autoimmune post-infarction reaction in which myocardial antigens released by necrosis trigger a pericardial inflammatory response.
The typical symptoms of Dressler’s syndrome include:
Post-infarction pericarditis with chest pain and fever.
Pericardial effusion visible on echocardiography.
Response to NSAIDs and colchicine.
Conclusion
The complications of ischemic heart disease require careful management to reduce mortality and improve patient quality of life. A multidisciplinary approach involving cardiologists, cardiovascular surgeons, and intensive care specialists is essential to optimize prognosis.
References
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