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Embolia Pulmonar I: Introdução
A embolia pulmonar (EP) ocorre quando um trombo, êmbolo gorduroso ou de ar, líquido amniótico ou tecido tumoral bloqueia uma ou mais artérias pulmonar…
Uma embolia pulmonar ocorre quando um trombo, líquido amniótico, tecido tumoral, gordura ou êmbolo aéreo viaja pelas veias e bloqueia uma ou mais artérias pulmonares.
Geralmente surge de trombose venosa profunda desalojada ou fragmentada, estados hipercoaguláveis, como trombofilias hereditárias, e estase venosa na obesidade.
A embolia pulmonar começa quando um trombo ou êmbolo desalojado viaja pelo sistema venoso, passa pelo átrio e ventrículo direitos e entra nas artérias pulmonares.
Pequenos êmbolos podem bloquear as arteríolas pulmonares terminais, causando múltiplos pequenos infartos pulmonares e necrose isquêmica do tecido pulmonar.
Trombos maiores podem obstruir as artérias pulmonares, interromper o fluxo sanguíneo e causar incompatibilidade ventilação-perfusão, levando à hipoxemia.
Essa obstrução também desencadeia uma resposta inflamatória, causa vasoconstrição local e aumenta a permeabilidade vascular. Essas alterações elevam as pressões nas artérias pulmonares e no ventrículo direito, podendo causar insuficiência ventricular direita.
Pequenos êmbolos podem causar dispneia, dor torácica, estertores ou sibilância e acentuação dos sons cardíacos pulmonares.
Êmbolos maciços podem causar parada cardiorrespiratória.
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Q1: What causes a pulmonary embolism to develop?
A pulmonary embolism occurs when a thrombus, fat, air, amniotic fluid, or tumor tissue travels through the venous system and blocks pulmonary arteries. It commonly arises from dislodged deep vein thrombosis, hypercoagulable states like inherited thrombophilias, and venous stasis in obesity. Risk factors include prolonged immobility, recent surgery, cancer, oral contraceptives, and pregnancy.
Q2: How does a blood clot travel to the lungs during pulmonary embolism?
When a thrombus dislodges, it travels through the venous system, passing through the right atrium and ventricle before lodging in the pulmonary arteries. Small emboli may block terminal pulmonary arterioles, causing multiple small lung infarctions. Larger thrombi obstruct major pulmonary arteries, disrupting blood flow and causing ventilation-perfusion mismatch.
Q3: What happens to the lungs when a pulmonary embolism blocks blood flow?
Pulmonary artery obstruction increases vascular resistance and elevates pressures in the pulmonary arteries and right ventricle, potentially causing right ventricular failure. The blockage triggers an inflammatory response, causing local vasoconstriction and increased vascular permeability. This creates a ventilation-perfusion mismatch where lung areas receive ventilation but lack perfusion, impairing gas exchange and leading to hypoxemia.
Q4: What are the symptoms of a small pulmonary embolism?
Small emboli may cause vague and transient symptoms including dyspnea, mild to moderate hypoxemia, tachypnea, cough, chest pain, hemoptysis, wheezing or crackles, fever, tachycardia, accentuation of the pulmonic heart sound, and syncope. Symptoms begin gradually or appear suddenly depending on the degree of pulmonary arterial blockage.
Q5: What are the signs of a massive pulmonary embolism?
Massive pulmonary emboli may result in sudden changes in mental status, feelings of impending doom, hypotension, and cardiorespiratory arrest. These severe manifestations reflect the degree of pulmonary arterial blockage and the severity of hemodynamic and respiratory compromise. Prompt recognition and intervention are critical to manage massive PE and mitigate the risk of fatal outcomes.
Q6: What risk factors increase the likelihood of developing pulmonary embolism?
Risk factors for pulmonary embolism include prolonged immobility, recent pelvic or lower extremity surgery, history of venous thromboembolism, cancer, obesity, oral contraceptives or hormone therapy, smoking, prolonged air travel over four hours, heart failure, and pregnancy. Endothelial injury from surgery and trauma also increases PE risk.
Q7: How does obesity contribute to pulmonary embolism development?
Obesity promotes pulmonary embolism through venous stasis, a condition where blood flow slows in the veins, increasing the risk of thrombus formation. Venous stasis combined with hypercoagulable states and endothelial injury creates an environment favoring clot development and dislodgement. This mechanism makes obesity a significant etiological factor in PE pathogenesis.