Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0012833 (dizziness)
 9,689 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hemodynamic syncope is caused by an impediment to a necessary increase of the cardiac output; therefore, hemodynamic syncopes most often occur during or shortly after exercise. However, a syncope at rest does not exclude a hemodynamic cause. Moreover, arrhythmias which may directly lead to syncope or accentuate the hemodynamic impediment are often present in cardiac diseases causing hemodynamic syncope. Hemodynamic syncopes are responsible for 2 to 3% of all syncopes leading to medical evaluation. Of these, more than half are caused by aortic stenosis and about one quarter by pulmonary embolism. Other reasons are rare. Hypertrophic cardiomyopathy is more often associated with arrhythmic than with hemodynamic syncope. Syncope in primary pulmonary hypertension is often preceded by dizziness, epigastric distress and faintness. Since the medical therapy may lead to hemodynamic deterioration, it must be started under invasive observation. Primary tumors of the heart are rare; secondary cardiac neoplasms are 6 to 40 times more common. Myxoma is the most common primary tumor of the heart. It is important to promptly undertake surgery in order to improve prognosis. Various other diseases may provoke hemodynamic syncope; however, other symptoms are by far more common.
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PMID:[Hemodynamically-induced syncope]. 933 77

Myxomas are the most common cancerous nonneoplasms among the rare heart's tumors. Usually, they are located in the left atrium (LA). They are more frequent in women than in men and ranged in age from 30 to 50 years. Rarely, myxoma is completely asymptomatic and in that case represents a fortuitous discovery. However, usually, it is characterized by several symptoms as fatigue, dyspnea, chest pain, dizziness, cough, and sometimes, by sudden death. We refer on a case of LA myxoma found in a woman without symptoms but having a systolic precordial murmur. Two-dimensional echocardiography (2-DE) shown an unknown giant LA myxoma, almost completely occupying the atrial cavity. 2-D left atrial longitudinal speckle tracking echocardiography first allowed to note the changes in the percentage of "reservoir," "conduit," and "booster pump" phases of the left atrial function respect to normal subjects, revealing LA dysfunction. Three-dimensional echocardiography (3-DE) shown left atrial mass and its attachment to the atrial septum better than 2-DE. Furthermore, 3-DE allowed to define the shape of LA myxoma and its 3-D, irregular contour.
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PMID:Two-dimensional Speckle Tracking Echocardiography and Three-dimensional Echocardiography Characterization of Left Atrial Giant Myxoma. 2846 65