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Valvulografiya

Valvulografiya (Latin valvula diminutive from valva – a door shutter; anatomic valvula – the valve, the gate + Greek grapho – to write, represent) – a way of studying of movements of heart valves by means of a continuous ultrasonic location.

 
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Even if heart of the person does not fight, then he all the same can live during a long period, as the Norwegian fisherman Jan Revsdal showed us. Its "motor" stopped for 4 hours after the fisherman got lost and fell asleep in snow.