[Pulsed Doppler echocardiography measurement in healthy warmblood horses].

The research study uses pulsed Doppler echocardiography to measure blood flow in the hearts of twenty healthy warmblood horses, recording typical blood flow tracings and flow velocities. It suggests the data could provide a profile to help identify abnormal heart function in diseased horses, pointing out similarities between the flow velocity in horses and humans.

Methodology and Findings

• To gather data, the team used pulsed Doppler echocardiography, a non-invasive procedure that employs ultrasound technology to examine the velocity and direction of blood flow in the heart.
• Measurements were performed on twenty healthy warm-blooded horses, and standard locations for placing the ultrasound transducer and sampling blood flow were determined.
• The Doppler beam angle used varied between 37° and 40° for the right heart atrioventricular flow tract, and between 44° and 47° for the left heart atrioventricular flow tract.
• Peak blood flow velocities were recorded, being approximately 0.71 m/s in the tricuspid valve (right heart) and 0.92 m/s in the mitral valve (left heart).
• A characteristic double-peak blood flow pattern was observed in both the right and left atrioventricular flow tracts, similar to what is seen in human echocardiography.

Secondary Findings

• Observations were not only confined to the heart but also extended to the pulmonary valve and aortic valve.
• The Doppler beam angles here varied between 28° and 33° for the right heart, and between 34° and 37° for the left heart.
• Peak flow velocity was recorded as 0.98 m/s in the pulmonary valve, and 0.92 m/s in the aortic valve, which was angle corrected.
• The flow patterns observed in these areas also displayed paradoxical flows during systole (period of heart muscle contraction) and diastole (period of heart muscle relaxation).

Conclusions

• The results from these studies revealed a wide range of flow velocity values among the healthy horses, as seen in healthy humans.
• This research is significant as it establishes characteristic profiles for normal heart function in horses, which can be used as a baseline to detect abnormal heart function in horses with heart diseases.
• The study also pointed out the similarities between the blood flow characteristics in the hearts of humans and horses, which may assist in cross-species comparison studies.