In most cases, pulmonary embolism is caused by a blood clot in the leg that breaks loose and travels to the lungs. A blood clot in a vein close to the skin is not likely to cause problems. But having blood clots in deep veins (deep vein thrombosis) can lead to pulmonary embolism.
St. Petersburg. 1  St. Petersburg is a city with a long and eventful history. 2  Altai is perhaps the most beautiful region of Russia. 3  Moscow is the capital of Russia, as well as the nationâs epicentre of arts, music, science, academics, and politics.  For a step back in time, Olkhon Island is a wonderful place to visit.
[ËkujbÉ¨ÊÉ¨f]), is the sixth largest city in Russia and the administrative center of Samara Oblast. It is situated in the southeastern part of European Russia at the confluence of the Volga and Samara Rivers on the east bank of the Volga.amara is the home of Samara State Aerospace University (SSAU), one of Russia's leading engineering and technical institutions. SSAU faculty and graduates have played a significant role in Russiaâs space program since its conception.