Key result
Indices from the apex cardiogram using 6 different transducer systems showed variations up to 20% (mean values 3.2-8.1%), whereas left ventricular pressure measurements varied by only 0.5-1.9%.
Authors
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Apex cardiogram indices vary substantially by transducer; leaves open standardization needs before clinical or research use.
Willems et al. (1979) studied this question. 6 different apex cardiographic transducers vs. Left ventricular pressure measurements was evaluated on Variations in 'contractility' indices derived from the normalised derivative. Indices from the apex cardiogram using 6 different transducer systems showed variations up to 20% (mean values 3.2-8.1%), whereas left ventricular pressure measurements varied by only 0.5-1.9%.
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