Key result
Contour sound spectrograms detected aortic ball variance, showing peak frequencies <1,300 cycles/sec in 11 of 12 affected patients compared to >1,300 cycles/sec in 24 of 25 controls.
Why the study?
Does contour sound spectrography accurately detect aortic ball variance in patients with Starr-Edwards aortic prostheses?
Population
37 patients with cardiac valve prostheses, including 12 with operation-confirmed ball variance and 25…
Comparison
Contour sound spectrography vs Control patients without ball variance
Design
Case-control
Authors
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May support noninvasive detection of Starr-Edwards ball variance; leaves open prospective validation before any practice change.
Case-Control (n=37)
Does contour sound spectrography accurately detect aortic ball variance in patients with Starr-Edwards aortic prostheses?
Absolute Event Rate: 91.7% vs 4%
Sound spectrography provides reliable objective evidence of aortic ball variance in patients with Starr-Edwards Model 1000 series prostheses by detecting decreased peak frequencies of the aortic opening sound.
Hylen et al. (1969) conducted a case-control in Aortic ball variance (n=37). Aortic ball variance vs. Controls was evaluated on Peak frequency of the aortic opening sound below 1,300 cycles/sec. Contour sound spectrograms detected aortic ball variance, showing peak frequencies <1,300 cycles/sec in 11 of 12 affected patients compared to >1,300 cycles/sec in 24 of 25 controls.
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