This study seeks to assess the strength of correlation between arterial pressure waveform derived contractility as quantified by the maximal rate of pressure change ans a function of time (dp/dtmax) and transesophageal echocardiographically (TEE) determined contractility, also quantified by dp/dtmax. In addition, correlations between dp/dtmax. In addition, TEE derived assessment of ejection fraction will provide guidance for relating this new parameter with other standard contractility assessments.
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dp/dt correlations
Timeframe: During the operative period (approximately 5 hours)