Key result
In intact dogs, absolute changes in left ventricular circumference were considerably greater than changes in length, though relative changes were similar (averaging 2 to 3 percent).
Absolute LV circumference exceeds length changes in dogs; leaves open translation to human ventricular mechanics.
Changes in length and circumference of the left ventricle were recorded simultaneously by variable resistance gages on its external surface in intact dogs. The absolute changes in circumference were considerably greater than the changes in length, but the relative changes in these dimensions were similar (averaging around 2 to 3 per cent). Under most circumstances, the length and circumference vary in the same direction but occasionally inexplicable differences in response were observed.
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Rushmer et al. (1955) studied this question. Measurement of left ventricular length and circumference was evaluated on Changes in length and circumference of the left ventricle. In intact dogs, absolute changes in left ventricular circumference were considerably greater than changes in length, though relative changes were similar (averaging 2 to 3 percent).
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