{"id":4704,"date":"2025-08-14T20:51:42","date_gmt":"2025-08-15T00:51:42","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/?post_type=chapter&p=4704"},"modified":"2025-12-07T23:24:59","modified_gmt":"2025-12-08T04:24:59","slug":"pulmonary-embolism","status":"web-only","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/chapter\/pulmonary-embolism\/","title":{"raw":"6p18 Pulmonary Embolism","rendered":"6p18 Pulmonary Embolism"},"content":{"raw":"

What is a Pulmonary Embolism (PE), How Does it Occur, and What Problems Can it Cause?<\/strong><\/h2>\r\n

Overview:<\/strong><\/h1>\r\n
    \r\n \t
  • A serious vascular disorder with a high mortality rate\u2014about 1 in 10 deaths.<\/li>\r\n \t
  • Usually caused by a\u00a0blood clot (thrombus)<\/strong>\u00a0originating in the veins of the legs (deep vein thrombosis - DVT).<\/li>\r\n \t
  • Clots can travel through the venous system, into the right heart, and lodge in the pulmonary arteries or capillaries, causing obstruction.<\/li>\r\n<\/ul>\r\n

    Pathogenesis:<\/strong><\/h1>\r\n
      \r\n \t
    • Sluggish blood flow<\/strong>\u00a0in leg veins increases susceptibility to clot formation, especially in:\r\n
        \r\n \t
      • Immobile individuals.<\/li>\r\n \t
      • Post-surgery or trauma patients.<\/li>\r\n \t
      • Pregnant women.<\/li>\r\n \t
      • Long flights (e.g., Ron Maclean's wife example).<\/li>\r\n \t
      • People with cancer or heart failure.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
      • Clots travel through the\u00a0inferior vena cava<\/strong>\u00a0\u2192\u00a0right atrium<\/strong>\u00a0\u2192\u00a0right ventricle<\/strong>\u00a0\u2192 pulmonary circulation.<\/li>\r\n \t
      • Clots may vary in size:\r\n
          \r\n \t
        • Small emboli:<\/strong>\u00a0often silent; occlude a small portion of pulmonary capillaries.<\/li>\r\n \t
        • Large emboli:<\/strong>\u00a0can block the\u00a0pulmonary trunk<\/strong>, causing acute, catastrophic circulatory failure and sudden death.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

          Signs and Symptoms:<\/strong><\/h1>\r\n
            \r\n \t
          • Small emboli:<\/strong>\u00a0Transient chest pain (resembling a mild heart attack), cough, shortness of breath\u2014may resolve spontaneously.<\/li>\r\n \t
          • Large emboli:<\/strong>\u00a0Severe chest pain, tachypnea, hypoxia, cyanosis, sweating, rapid heartbeat, and signs of shock.<\/li>\r\n \t
          • Massive PE:<\/strong>\u00a0Low blood pressure, severe hypoxia, loss of consciousness, and potential death if untreated.<\/li>\r\n<\/ul>\r\n

            Effects on the Cardiovascular System:<\/strong><\/h1>\r\n
              \r\n \t
            • Vasoconstriction<\/strong>\u00a0triggered by hypoxia.<\/li>\r\n \t
            • Reduced blood flow to lungs leads to\u00a0pulmonary hypertension<\/strong>.<\/li>\r\n \t
            • Increased strain on the\u00a0right ventricle<\/strong>, which may become dilated and fail (cor pulmonale<\/strong>).<\/li>\r\n \t
            • Organ failure:<\/strong>\u00a0due to inadequate oxygen delivery.<\/li>\r\n<\/ul>\r\n

              Diagnostic Tools:<\/strong><\/h1>\r\n
                \r\n \t
              • Chest X-ray, CT scan, MRI.<\/li>\r\n \t
              • Ventilation-perfusion scan (V\/Q scan):<\/strong>\u00a0detects mismatched areas of poor ventilation and perfusion.<\/li>\r\n \t
              • Doppler ultrasound<\/strong>\u00a0for DVT detection.<\/li>\r\n \t
              • Blood tests for D-dimer.<\/li>\r\n<\/ul>\r\n

                Prevention:<\/strong><\/h1>\r\n
                  \r\n \t
                • Early mobilization post-surgery.<\/li>\r\n \t
                • Use of\u00a0compression stockings<\/strong>\u00a0and\u00a0anti-embolism stockings<\/strong>.<\/li>\r\n \t
                • Hydration\u2014avoid dehydration to prevent blood thickening.<\/li>\r\n \t
                • Anticoagulants:<\/strong>\u00a0warfarin, aspirin (ASA).<\/li>\r\n \t
                • Prophylactic filters:<\/strong>\u00a0cava filters (percutaneous) inserted into the vena cava to catch emboli from leg veins.<\/li>\r\n<\/ul>\r\n

                  Treatment for PE:<\/strong><\/h1>\r\n
                    \r\n \t
                  • Oxygen therapy<\/strong>.<\/li>\r\n \t
                  • Anticoagulation<\/strong>\u00a0to prevent further clot formation.<\/li>\r\n \t
                  • Thrombolytic agents<\/strong>\u00a0(clot-busting drugs) for large or life-threatening emboli.<\/li>\r\n \t
                  • Surgical removal or placement of filters if indicated.<\/li>\r\n<\/ul>\r\n

                    Pathophysiology Recap (Event Flow):<\/strong><\/h1>\r\n
                      \r\n \t
                    • Thrombus forms in leg veins \u2192 travels through vena cava \u2192 lodges in pulmonary arteries.<\/li>\r\n \t
                    • Large embolus blocks blood flow to lungs \u2192 no blood returns to heart \u2192 decreased cardiac output \u2192 hypoxia and organ failure.<\/li>\r\n \t
                    • Smaller emboli may cause minimal symptoms, but multiple emboli worsen overall lung function and may lead to chronic hypoxia.<\/li>\r\n<\/ul>\r\n

                      Summary:<\/strong><\/h1>\r\nPulmonary embolism is a potentially fatal condition resulting from a blood clot traveling from the legs to the lungs. Its severity depends on clot size, location, and promptness of treatment. Prevention efforts focus on mobility, hydration, and anticoagulation in high-risk patients. Early diagnosis and management are critical for survival.","rendered":"

                      What is a Pulmonary Embolism (PE), How Does it Occur, and What Problems Can it Cause?<\/strong><\/h2>\n

                      Overview:<\/strong><\/h1>\n
                        \n
                      • A serious vascular disorder with a high mortality rate\u2014about 1 in 10 deaths.<\/li>\n
                      • Usually caused by a\u00a0blood clot (thrombus)<\/strong>\u00a0originating in the veins of the legs (deep vein thrombosis – DVT).<\/li>\n
                      • Clots can travel through the venous system, into the right heart, and lodge in the pulmonary arteries or capillaries, causing obstruction.<\/li>\n<\/ul>\n

                        Pathogenesis:<\/strong><\/h1>\n
                          \n
                        • Sluggish blood flow<\/strong>\u00a0in leg veins increases susceptibility to clot formation, especially in:\n
                            \n
                          • Immobile individuals.<\/li>\n
                          • Post-surgery or trauma patients.<\/li>\n
                          • Pregnant women.<\/li>\n
                          • Long flights (e.g., Ron Maclean’s wife example).<\/li>\n
                          • People with cancer or heart failure.<\/li>\n<\/ul>\n<\/li>\n
                          • Clots travel through the\u00a0inferior vena cava<\/strong>\u00a0\u2192\u00a0right atrium<\/strong>\u00a0\u2192\u00a0right ventricle<\/strong>\u00a0\u2192 pulmonary circulation.<\/li>\n
                          • Clots may vary in size:\n
                              \n
                            • Small emboli:<\/strong>\u00a0often silent; occlude a small portion of pulmonary capillaries.<\/li>\n
                            • Large emboli:<\/strong>\u00a0can block the\u00a0pulmonary trunk<\/strong>, causing acute, catastrophic circulatory failure and sudden death.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                              Signs and Symptoms:<\/strong><\/h1>\n
                                \n
                              • Small emboli:<\/strong>\u00a0Transient chest pain (resembling a mild heart attack), cough, shortness of breath\u2014may resolve spontaneously.<\/li>\n
                              • Large emboli:<\/strong>\u00a0Severe chest pain, tachypnea, hypoxia, cyanosis, sweating, rapid heartbeat, and signs of shock.<\/li>\n
                              • Massive PE:<\/strong>\u00a0Low blood pressure, severe hypoxia, loss of consciousness, and potential death if untreated.<\/li>\n<\/ul>\n

                                Effects on the Cardiovascular System:<\/strong><\/h1>\n
                                  \n
                                • Vasoconstriction<\/strong>\u00a0triggered by hypoxia.<\/li>\n
                                • Reduced blood flow to lungs leads to\u00a0pulmonary hypertension<\/strong>.<\/li>\n
                                • Increased strain on the\u00a0right ventricle<\/strong>, which may become dilated and fail (cor pulmonale<\/strong>).<\/li>\n
                                • Organ failure:<\/strong>\u00a0due to inadequate oxygen delivery.<\/li>\n<\/ul>\n

                                  Diagnostic Tools:<\/strong><\/h1>\n
                                    \n
                                  • Chest X-ray, CT scan, MRI.<\/li>\n
                                  • Ventilation-perfusion scan (V\/Q scan):<\/strong>\u00a0detects mismatched areas of poor ventilation and perfusion.<\/li>\n
                                  • Doppler ultrasound<\/strong>\u00a0for DVT detection.<\/li>\n
                                  • Blood tests for D-dimer.<\/li>\n<\/ul>\n

                                    Prevention:<\/strong><\/h1>\n
                                      \n
                                    • Early mobilization post-surgery.<\/li>\n
                                    • Use of\u00a0compression stockings<\/strong>\u00a0and\u00a0anti-embolism stockings<\/strong>.<\/li>\n
                                    • Hydration\u2014avoid dehydration to prevent blood thickening.<\/li>\n
                                    • Anticoagulants:<\/strong>\u00a0warfarin, aspirin (ASA).<\/li>\n
                                    • Prophylactic filters:<\/strong>\u00a0cava filters (percutaneous) inserted into the vena cava to catch emboli from leg veins.<\/li>\n<\/ul>\n

                                      Treatment for PE:<\/strong><\/h1>\n
                                        \n
                                      • Oxygen therapy<\/strong>.<\/li>\n
                                      • Anticoagulation<\/strong>\u00a0to prevent further clot formation.<\/li>\n
                                      • Thrombolytic agents<\/strong>\u00a0(clot-busting drugs) for large or life-threatening emboli.<\/li>\n
                                      • Surgical removal or placement of filters if indicated.<\/li>\n<\/ul>\n

                                        Pathophysiology Recap (Event Flow):<\/strong><\/h1>\n
                                          \n
                                        • Thrombus forms in leg veins \u2192 travels through vena cava \u2192 lodges in pulmonary arteries.<\/li>\n
                                        • Large embolus blocks blood flow to lungs \u2192 no blood returns to heart \u2192 decreased cardiac output \u2192 hypoxia and organ failure.<\/li>\n
                                        • Smaller emboli may cause minimal symptoms, but multiple emboli worsen overall lung function and may lead to chronic hypoxia.<\/li>\n<\/ul>\n

                                          Summary:<\/strong><\/h1>\n

                                          Pulmonary embolism is a potentially fatal condition resulting from a blood clot traveling from the legs to the lungs. Its severity depends on clot size, location, and promptness of treatment. Prevention efforts focus on mobility, hydration, and anticoagulation in high-risk patients. Early diagnosis and management are critical for survival.<\/p>\n","protected":false},"author":1370,"menu_order":19,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["zoe-soon"],"pb_section_license":"cc-by-nc-sa"},"chapter-type":[],"contributor":[60],"license":[57],"class_list":["post-4704","chapter","type-chapter","status-web-only","hentry","contributor-zoe-soon","license-cc-by-nc-sa"],"part":47,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/users\/1370"}],"version-history":[{"count":3,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4704\/revisions"}],"predecessor-version":[{"id":5311,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4704\/revisions\/5311"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/parts\/47"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/4704\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/media?parent=4704"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapter-type?post=4704"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/contributor?post=4704"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/license?post=4704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}