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Query: UMLS:C0034065 (pulmonary embolism)
 14,979 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The major nuclear medicine contribution to the pulmonary imaging literature for the past year was the inaugural report from the Prospective Investigation of Pulmonary Embolism Diagnosis study. Investigations focusing on the role of thrombolytic agents for the management of pulmonary thrombosis have advanced to the stage in which different therapeutic regimens are being tested along with new agents that continue to emerge. Ongoing research and clinical trials are evaluating newer radiolabeled aerosols in patients with airways and interstitial lung disease using imaging and clearance measurements. Positron-emission tomography continues to be utilized in a few research centers for tumor localization and characterization.
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PMID:Pulmonary nuclear medicine. 175 Dec 95

Pulmonary embolism (PE) leads to an abnormal alveolar deadspace that is expired in synchrony with gas from normally perfused alveoli. This feature of PE separates it from pulmonary diseases affecting the airways, which are characterized by nonsynchronous emptying of compartments with an uneven ventilation/perfusion relationship. An analysis of the single breath test (SBT) for CO2, SBT-CO2, focusing on the late tidal expirate, was made in order to evaluate the feasibility to use the SBT-CO2 for the diagnosis of PE. The test was evaluated in 38 patients with suspected PE where pulmonary angiography showed that nine had PE and 29 did not. It was also tested in a reference population consisting of patients with normal lung function, obstructive lung disease and interstitial lung disease. Previously suggested gas exchange measurements for the diagnosis of PE, ie, the physiologic deadspace fraction, VDphys/VT, and the arterial-to-end-tidal CO2 gradient, P(a-E')CO2, were also evaluated in the groups. SBT-CO2 achieved a nearly complete separation between the patients with PE and those without. The other measurements, however, showed a substantial overlap between patients with PE and those with obstructive or interstitial lung disease. The SBT-CO2 is simple and potentially widely available and warrants further study as a routine technique for the diagnosis of PE.
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PMID:Diagnosis of pulmonary embolism based upon alveolar dead space analysis. 275 19

Pleuropulmonary complications of systemic lupus erythematosus (SLE) occur in 50-70% of patients and include pleuritis, pleural effusions, acute lupus pneumonitis, diffuse interstitial lung disease, atelectasis, diaphragmatic dysfunction and bronchiolitis obliterans. Additionally, a syndrome of acute reversible hypoxemia has recently been documented. This seems to occur in patients hospitalized for exacerbations of SLE and may be due to pulmonary leukoaggregation. It has become clear that other groups of pulmonary complications may be specifically associated with the antiphospholipid antibodies, both in patients with SLE and in those suffering from the "primary" antiphospholipid syndrome. These include pulmonary embolism and infarction, both thromboembolic and perhaps nonthromboembolic pulmonary hypertension, pulmonary arterial thrombosis, pulmonary microthrombosis, adult respiratory distress syndrome, intraalveolar pulmonary hemorrhage, as well as a postpartum syndrome.
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PMID:Review: antiphospholipid antibodies and the lung. 769 84

Radionuclide study for pulmonary diseases is divided in three large categories, respiratory function of ventilation and perfusion, non-respiratory function such as mucocilliary movement, epithelial permeability, and tumor imaging. Ventilation and perfusion scintigraphy are useful for the diagnosis and follow up of pulmonary embolism, obstructive lung disease, etc. A new ventilatory agent, 99mTc-technegas, is now available and many studies with this gas have been reported. As a tumor imaging agent, 201TlCl is coming popular for the diagnosis of lung cancer and early detection of metastatic lesions. Tumor detection with 99mTc-MIBI is also tried to differentiate the malignant tumor from the benign process. As applications of nuclear medicine for the interstitial lung disease, 67Ga scintigraphy and measurement of epithelial permeability with 99mTc-DTPA are available for an evaluation of activity of the disease and damage of lung epithelial integrity. In this report, significance and useful application of the radionuclide methods were summarized.
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PMID:[New trends of pulmonary nuclear medicine]. 783 8

The pleuropulmonary manifestation of systemic lupus erythematous (SLE) are pleuritis, acute lupus pneumonitis, chronic interstitial lung disease with fibrosis, alveolar hemorrhage, respiratory muscle and diaphragmatic dysfunction, atelectasis, bronchiolitis obliterans, pulmonary vascular disease with pulmonary hypertension, and pulmonary embolism. This article reviews these specific pleuropulmonary consequences of SLE while focusing on clinical, pathologic, and therapeutic considerations.
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PMID:Pleuropulmonary manifestations of systemic lupus erythematosus. 815 98

The lung has long been neglected by MR imaging. This is due to unique intrinsic difficulties: (1) signal loss due to cardiac pulsation and respiration; (2) susceptibility artifacts caused by multiple air-tissue interfaces; (3) low proton density. There are many MR strategies to overcome these problems. They consist of breath-hold imaging, respiratory and cardiac gating procedures, use of short repetition and echo times, increase of the relaxivity of existing spins by administration of intravenous contrast agents, and enrichment of spin density by hyperpolarized noble gases or oxygen. Improvements in scanner performance and frequent use of contrast media have increased the interest in MR imaging and MR angiography of the lung. They can be used on a routine basis for the following indications: characterization of pulmonary nodules, staging of bronchogenic carcinoma, in particular assessment of chest wall invasion; evaluation of inflammatory activity in interstitial lung disease; acute pulmonary embolism, chronic thromboembolic pulmonary hypertension, vascular involvement in malignant disease; vascular abnormalities. Future perspectives include perfusion imaging using extracellular or intravascular (blood pool) contrast agents and ventilation imaging using inhalation of hyperpolarized noble gases, of paramagnetic oxygen or of aerosolized contrast agents. These techniques represent new approaches to functional lung imaging. The combination of visualization of morphology and functional assessment of ventilation and perfusion is unequalled by any other technique.
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PMID:Contrast-enhanced MRI of the lung. 1092 61

Chronic dyspnea is defined as dyspnea lasting more than one month. In approximately two thirds of patients presenting with dyspnea, the underlying cause is cardiopulmonary disease. Establishing an accurate diagnosis is essential because treatment differs depending on the underlying condition. Asthma, congestive heart failure, chronic obstructive pulmonary disease, pneumonia, cardiac ischemia, interstitial lung disease, and psychogenic causes account for 85 percent of patients with this principal symptom. The history and physical examination should guide selection of initial diagnostic tests such as electrocardiogram, chest radiograph, pulse oximetry, spirometry, complete blood count, and metabolic panel. If these are inconclusive, additional testing is indicated. Formal pulmonary function testing may be needed to establish a diagnosis of asthma, chronic obstructive pulmonary disease, or interstitial lung disease. High-resolution computed tomography is particularly useful for diagnosing interstitial lung disease, idiopathic pulmonary fibrosis, bronchiectasis, or pulmonary embolism. Echocardiography and brain natriuretic peptide levels help establish a diagnosis of congestive heart failure. If the diagnosis remains unclear, additional tests may be required. These include ventilation perfusion scans, Holter monitoring, cardiac catheterization, esophageal pH monitoring, lung biopsy, and cardiopulmonary exercise testing.
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PMID:Evaluation of chronic dyspnea. 1586 93

A 48-year-old patient with known alcohol abuse and long-standing liver cirrhosis presented with spontaneous bacterial peritonitis and subsequent hepato-renal syndrome. Autopsy revealed a large hepatocellular carcinoma of the right liver lobe. Histologically, pulmonary arteries, arterioles, and capillaries were occluded by numerous tumor emboli. Small tumor emboli also covered the endocardium of the right ventricle. A review of the literature shows that macroscopic as well as microscopic pulmonary tumor embolism is often diagnosed in patients with a previously unknown malignancy. Moreover, pulmonary tumor embolism radiologically mimics pneumonia, tuberculosis, or interstitial lung disease. Therefore, an autopsy should be considered in cases of fulminant or massive pulmonary embolism to exclude tumor embolism even when the patients' history is insignificant as to this point, and in cases with known malignant tumors and respiratory symptoms to exclude tumor microembolism.
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PMID:Massive pulmonary tumor microembolism from a hepatocellular carcinoma. 1648 87

Pulmonary hypertension and interstitial lung disease are the two main causes of death in systemic sclerosis. The hallmark of these complications is dyspnea on exertion. Assessment of dyspnea in systemic sclerosis is based on a questionnaire; 6-minute walk test and Borg index. After excluding anemia, a deceptive cause mainly due to digestive haemorrhage, echocardiography, pulmonary function tests and high resolution computed tomography of the chest are the first step to diagnosis. Peak velocity of tricuspid regurgitation as measured by echocardiography is the main parameter to evaluate the risk of pulmonary hypertension before performing a right heart catheterization. Diastolic left ventricle dysfunction is another frequently encountered cause of dyspnea in systemic sclerosis. Other less common causes are pericarditis, respiratory muscle involvement, lung cancer, pulmonary embolism.
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PMID:[Dyspnea upon exertion in systemic scleroderma: from symptom to etiological diagnosis]. 1919 23

Reactive airway disease is often triggered by an upper respiratory viral infection and readily responds to anti-inflammatory and bronchodilator therapy. The differential diagnosis for unresponsive disease includes poorly controlled asthma, noncompliance with medical regimen, vocal cord dysfunction, rhinosinusitis, gastroesophageal reflux disease or recurrent aspiration, foreign body aspiration, allergic bronchopulmonary aspergillosis, Churg-Strauss vasculitis, cardiac disorders such as congestive heart failure or mitral stenosis, or other pulmonary disorders such as chronic obstructive pulmonary disease, alpha-1 antitrypsin deficiency, interstitial lung disease, bronchiectasis, sarcoidosis, hypersensitivity pneumonitis, pulmonary embolism, cystic fibrosis, airway neoplasms, or laryngotracheomalacia. As is often the case, a meticulous history can expeditiously direct the clinician to the diagnosis, especially in a patient without a smoking, asthmatic, or atopic history.
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PMID:A 41-year-old male with cough, wheeze, and dyspnea poorly responsive to asthma therapy. 2081 28


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