An article summary called "Haemodynamic profile of young subjects with transient tinnitus" from Audiological Medicine (dated December 8, 2009) says a study shows that people (between the ages of 18 and 40) with a history of transient tinnitus seem to have smaller cardiac structural characteristics than normal, even though their ultrasounds were normal.
It makes sense that a smaller heart or valves can't pump or circulate blood quite as forcefully as a normal sized heart can.
And this comparatively poor blood circulation affects organs adversely -- including the cochlear in the inner ear -- with its adverse effect showing up as tinnitus.
The summary concludes that the observation indirectly supports the theory of a cochlear origin of tinnitus in a number of cases and is reminiscent of what happens in hypertension and heart failure.
You can read an abstract of the report or the summary.
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