Asymptomatic mastoid effusions have recently been observed in astronauts returning from long-term spaceflight. In hospitalized patients, mastoid effusion increases the risk for bacterial otitis/mastoiditis. We reasoned that cephalad fluid shifts during strict -6° head down tilt bed-rest (HDT) could reproduce space-flight associated mastoid effusion and that artificial gravity may reverse the response.
Gravity and Mastoid effusion
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