### Abstract

We hypothesize that a simplified version of the Euler equation (SEE) utilizing differences in velocity over a distance and time as obtained by Color Doppler M-mode (CMM) echocardiography can approximate actual peak transmitral pressure gradients (ΔP_{TM}). Methods: In 14 patients undergoing open-heart surgery, ΔP_{TM} was measured under various hemodynamic conditions using 2 high fidelity transducers, 5 cm apart. Transesophageal CMM images were simultaneously acquired and a customized image analysis application was used to abstract spatiotemporal velocity characteristics. Using both the SEE and a simplified Bernoulli equations, ΔP_{TM} were determined and compared to the actual ΔP_{TM}. Results: While the simplified Bernoulli equation resulted in a poor estimate (y = 0.075x+0.71, r = 0.45), the ΔP_{TM} obtained using the SEE correlated strongly (y = 0.79x+0.48, r = 0.91) with the actual measurements. Conclusions: Semi-automated analysis of CMM images using a SEE can accurately estimate actual ΔP_{TM}.

Original language | English (US) |
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Pages (from-to) | 181-184 |

Number of pages | 4 |

Journal | Computers in Cardiology |

State | Published - Dec 1 1999 |

Externally published | Yes |

Event | The 26th Annual Meeting: Computers in Cardiology 1999 - Hannover, Ger Duration: Sep 26 1999 → Sep 29 1999 |

### ASJC Scopus subject areas

- Computer Science Applications
- Cardiology and Cardiovascular Medicine

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## Cite this

*Computers in Cardiology*, 181-184.