CT in Lungenembolie Pulmonary embolism - Wikipedia

Pulmonary embolism PE is a blockage of an artery in the lungs by a substance that has traveled from elsewhere in the body through the bloodstream embolism. PE usually results from a blood clot in the leg that travels to the lung. Efforts to prevent PE include beginning to move as soon as possible after surgery, lower leg exercises during periods of sitting, and the use of blood thinners after some types of surgery. Pulmonary emboli affect aboutpeople each year in Europe.

Symptoms of pulmonary embolism are typically sudden in onset and may include one or many of the following: On physical examination, the lungs are usually normal, CT in Lungenembolie. Occasionally, a pleural friction rub may be audible over the affected area of the lung mostly in PE with infarct. A pleural effusion is sometimes present that is exudative, detectable by decreased percussion note, audible breath sounds, and vocal resonance.

As smaller pulmonary emboli tend to lodge in more peripheral areas without collateral circulation they are more likely to cause lung infarction and small effusions both of which are painfulbut not hypoxia, dyspnea or hemodynamic instability such as tachycardia. Larger PEs, which tend to lodge centrally, typically cause dyspnea, hypoxia, low blood pressurefast heart rate and faintingbut are often painless because there is no lung infarction due to collateral circulation.

The classic presentation for PE with pleuritic pain, CT in Lungenembolie and tachycardia is likely caused by a large fragmented embolism causing both large and small PEs, CT in Lungenembolie.

Thus, small PEs are often missed because they cause pleuritic pain alone without any other findings and large PEs often missed because they are painless and mimic other conditions often causing ECG changes and small rises in troponin and BNP levels. PEs are sometimes described as massive, submassive and nonmassive depending on the clinical signs and symptoms. Although the exact definitions of these are unclear, an accepted definition of massive PE is one in which there is hemodynamic instability such as sustained low blood pressure, slowed heart rateor pulselessness.

The conditions are generally regarded as a continuum termed venous thromboembolism VTE. The development of thrombosis is classically due to a group of causes named Virchow's triad alterations in blood flow, factors in the vessel wall and factors affecting the properties of the blood.

Often, more than one risk factor is present. After a first PE, the search for secondary causes is usually brief. Only when a second PE occurs, and especially when this happens while still under anticoagulant therapy, a further search for underlying conditions is undertaken. This will include testing "thrombophilia screen" for Factor V Leiden mutationantiphospholipid antibodies, protein C and S and antithrombin levels, and later prothrombin mutation, MTHFR mutation, Factor VIII concentration and rarer inherited coagulation abnormalities.

In order to diagnose a pulmonary embolism, a review of clinical criteria to determine the need for testing is recommended. If there are concerns this is followed by testing to determine a likelihood of being able to confirm a diagnosis by imaging, followed CT in Lungenembolie imaging if other tests have shown that there is a likelihood of a PE diagnosis. The diagnosis of PE is based primarily on validated clinical criteria combined with selective testing because the typical clinical presentation shortness of breathchest pain cannot be definitively differentiated from other causes of chest pain and shortness of breath.

The decision to perform medical imaging is based on clinical reasoning, CT in Lungenembolie, that is, the medical historyCT in Lungenembolie, symptoms and findings on physical examinationCT in Lungenembolie, followed by an assessment of clinical probability. The most commonly used method to predict clinical probability, CT in Lungenembolie, the Wells score, is a clinical prediction ruleCT in Lungenembolie, Fahrräder von Krampfadern use is complicated by multiple versions being available.

InPhilip Steven Wellsinitially developed a prediction rule based on a literature search to predict the likelihood of PE, based on clinical criteria. There are additional prediction rules for PE, such as the Geneva rule, CT in Lungenembolie. More importantly, the use of any rule is associated with reduction in recurrent thromboembolism.

Traditional interpretation [28] [29] [34], CT in Lungenembolie. Alternative interpretation [28] [31], CT in Lungenembolie. The pulmonary embolism rule-out criteria PERC helps assess people in whom pulmonary embolism is suspected, but unlikely.

Unlike the Wells score and Geneva scoreCT in Lungenembolie, which are clinical prediction rules intended to risk stratify people with suspected PE, CT in Lungenembolie, the PERC rule is designed to rule out risk of PE in people when the physician has already stratified them into a low-risk category.

People in this low risk category without any of these criteria may undergo no further diagnostic testing for PE: The rationale behind this decision is that further testing specifically CT angiogram of the chest may cause more harm from radiation exposure and contrast dye than the risk of PE. In people with a low or moderate suspicion of PE, a normal D-dimer level shown in a blood test is enough to exclude the possibility of thrombotic PE, with a three-month risk of thromboembolic events being 0.

In other words, a positive D-dimer is not synonymous with PE, but a negative D-dimer is, with a good degree of certainty, an indication of absence of a PE. When a PE is being suspected, several blood tests are done in order to exclude important secondary causes of PE. This includes a full blood countCT in Lungenembolie, clotting status PTaPTTTTand some screening tests erythrocyte sedimentation rateCT in Lungenembolie, renal functionliver enzymeselectrolytes. If one of these is abnormal, further investigations might be warranted.

In typical people who are not known to be at high risk of PE, imaging is helpful to confirm or exclude a diagnosis of PE after simpler first-line tests are used. CT pulmonary angiography is the recommended first line diagnostic imaging test in most people. Historically, the gold standard for diagnosis was pulmonary angiographyCT in Lungenembolie, but this has fallen into disuse with the increased availability ob es möglich ist, Geburt für Krampfadern kleinen Becken geben non-invasive techniques.

CT pulmonary angiography CTPA is a pulmonary angiogram obtained using computed tomography CT with CT in Lungenembolie rather than right heart catheterization.

Its advantages are clinical equivalence, its non-invasive nature, CT in Lungenembolie, its greater CT in Lungenembolie to people, and the possibility of identifying other lung disorders from the differential diagnosis in case there is no pulmonary embolism. On CT scanCT in Lungenembolie, pulmonary emboli can be classified according to level along the CT in Lungenembolie tree. CT pulmonary angiography showing a "saddle embolus" at the bifurcation of the main pulmonary artery and thrombus burden in the lobar arteries on both sides.

Assessing the accuracy of CT pulmonary angiography is hindered by the rapid changes in the number of rows of detectors available in multidetector CT MDCT machines. However, this study's results may be biased due to possible incorporation bias, since the CT scan was the final diagnostic tool in people with pulmonary embolism. The authors noted that a negative single slice CT scan is insufficient to rule out pulmonary embolism on its own.

This study noted that additional testing is necessary when the clinical probability is inconsistent with the imaging results. It is particularly useful in people who have an allergy to iodinated contrastimpaired renal function, or are pregnant due to its lower radiation exposure as compared to CT. Tests that are frequently done that are not sensitive for PE, but can be diagnostic. The primary use of the ECG is to rule out other causes of chest pain.

Varizen Großmutter Rezepte certain ECG changes may occur with PE, none are specific enough to confirm or sensitive enough to rule out the diagnosis. The most commonly seen signs in the ECG are sinus tachycardiaright axis deviation, and right bundle branch block, CT in Lungenembolie.

In massive and submassive PE, dysfunction of the right side of the heart may be seen on echocardiographyan indication that the pulmonary artery is severely obstructed and the right ventriclea low-pressure pump, is unable to match the pressure. Some studies see below suggest that this finding may be an indication for thrombolysis. Not every person with a suspected pulmonary embolism requires an echocardiogram, but elevations in cardiac troponins or brain natriuretic peptide may indicate heart strain and warrant an echocardiogram, [61] and be important in prognosis.

The specific appearance of the right ventricle on echocardiography is referred to as the McConnell's sign. This is the finding of akinesia of the mid-free wall but a normal motion of the apex. Ultrasound of the heart showing signs of PE [64], CT in Lungenembolie. Pulmonary embolism may be preventable in those with risk factors. People admitted to hospital may receive preventative medication, including unfractionated heparinlow molecular weight heparin LMWHor fondaparinuxand anti-thrombosis stockings to reduce the risk of a DVT in the leg that could dislodge and migrate to the lungs.

Following the completion of warfarin in those with CT in Lungenembolie PE, long-term aspirin is useful to prevent recurrence, CT in Lungenembolie. Anticoagulant therapy is the mainstay of treatment. CT in Lungenembolie, supportive treatments, CT in Lungenembolie, such as oxygen or analgesia CT in Lungenembolie, may be required, CT in Lungenembolie. People are often admitted to hospital in the early stages of treatment, and tend to remain under inpatient CT in Lungenembolie until the INR has reached therapeutic levels.

Increasingly, however, low-risk cases are managed at home in a fashion already common in the treatment of DVT. Usually, anticoagulant therapy is the mainstay of treatment. Unfractionated heparin UFHlow molecular weight heparin LMWHCT in Lungenembolie fondaparinux is administered initially, while warfarinacenocoumarolor phenprocoumon therapy is commenced this may take several days, usually while the patient is in CT in Lungenembolie hospital. LMWH may reduce bleeding among people with pulmonary embolism as compared to UFH according to a systematic review of randomized controlled trials by the Cochrane Collaboration.

There was no difference in overall mortality between participants treated with LMWH and those treated with unfractionated heparin. Warfarin therapy often requires a frequent dose adjustment and monitoring of the international normalized ratio INR.

In patients with an underlying malignancy, CT in Lungenembolie, therapy with a course of LMWH is favored over warfarin; it is continued for six months, CT in Lungenembolie, at which point a decision should be reached whether ongoing CT in Lungenembolie is required.

Similarly, pregnant women are often maintained on low molecular weight heparin until at least six weeks after delivery to avoid the known teratogenic effects of warfarin, especially in the early stages of pregnancy. Warfarin therapy is usually continued for 3—6 months, or "lifelong" if there have been previous DVTs or PEs, or none of the usual risk factors is present. An abnormal D-dimer level at the end of treatment might signal the need for continued treatment among patients with a first unprovoked pulmonary embolus.

In this situation, it is the best available treatment in those without contraindications and is supported by clinical guidelines. Catheter-directed thrombolysis CDT is a new technique found to be relatively safe and effective for massive PEs. This involves accessing the venous system by placing a catheter into a vein in the groin and guiding it through the veins by using fluoroscopic imaging until CT in Lungenembolie is located next to the PE in the lung circulation.

Medication that breaks up blood clots is released through the catheter so that its highest concentration is directly next to the pulmonary embolus. CDT is performed by CT in Lungenembolie radiologistsand in medical centers that offer CDT, it may be offered as a first-line treatment. The use of thrombolysis in non-massive PEs is still debated.

There are two situations when an inferior vena cava filter is considered advantageous, and those are if anticoagulant therapy is contraindicated e.

Inferior vena cava CT in Lungenembolie should be removed as soon as it becomes safe to start using anticoagulation. The long-term safety profile of permanently leaving a filter inside the body is not known. Surgical management of acute pulmonary embolism pulmonary thrombectomy is uncommon and has largely been abandoned because of poor long-term outcomes. However, recently, it has gone through a resurgence with the revision of the surgical technique and is thought to benefit certain people.

Pulmonary emboli occur in more thanpeople in the United States each year. There are several markers used for risk stratification and these are also independent predictors of adverse outcome.

These include hypotension, cardiogenic shock, syncope, evidence of right heart dysfunction, and elevated cardiac enzymes. Prognosis depends on the amount of lung that is affected and on the co-existence of other medical conditions; chronic embolisation to the lung can lead to pulmonary hypertension, CT in Lungenembolie. After a massive PE, the embolus must be resolved somehow if the patient is to survive. In thrombotic PE, the blood clot may be broken down by fibrinolysisor it may be organized and recanalized so that a new channel forms through the clot.

Blood flow is restored most rapidly in the first day or two after a PE. There is controversy over whether small subsegmental PEs need treatment at all [86] and some evidence exists that patients with subsegmental PEs may do well without treatment.

Once anticoagulation is stopped, the risk of a fatal pulmonary embolism is 0. This figure comes from a trial published in by Barrit and Jordan, [89] which CT in Lungenembolie anticoagulation against placebo for the management of PE. Barritt and Jordan performed their study in the Bristol Royal Infirmary in


CT in Lungenembolie

This service is more advanced with JavaScript available, learn more at http: Typische Zeichen der LE werden anhand von Bildbeispielen veranschaulicht, CT in Lungenembolie. Diagnostische und qualitätssichernde CT in Lungenembolie für den Einsatz in der täglichen Notfalldiagnostik werden unter Berücksichtigung möglicher Fehlerquellen und Artefakte erläutert. Multislice computed tomography MSCT of the pulmonary arteries has overcome the limitations of single-slice CT and is accepted as the sole reference standard for imaging pulmonary embolism PE in many institutions.

This technique provides the opportunity of efficient risk stratification to enable adequate differential therapy. This article discusses the present role of MSCT in diagnostic imaging of PE and CT in Lungenembolie optimized acquisition protocols as well as practical aspects for secondary image reconstruction.

Examples of typical imaging features of PE are shown. Diagnostic algorithms for daily emergency practice are discussed with respect to artifacts and pitfalls in image interpretation.

Authors Authors and affiliations J. Value of multislice CT for the work-up of pulmonary embolism. European Society of Cardiology Guidelines on diagnosis and management of acute pulmonary embolism.

Task Force on Pulmonary Embolism, CT in Lungenembolie. Eur Heart J CT in Lungenembolie Comput Assist Tomogr Herold CJ Spiral computed tomography of pulmonary embolism. Eur Respir J 19 [suppl 35]: Moores LK, Jackson WL jr Defining the role of computed tomographic pulmonary angiography in suspected pulmonary embolism.

Ann Intern Med Am J Med N Engl J Med Am J Cardiol A retrolective-prolective cohort study focusing on total diagnostic yield. Cite article How to cite? Cookies We use cookies to improve your experience with our site.


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