Transcutaneous aortovelography. A quantitative evaluation

Area of Science:

• Cardiovascular Physiology
• Medical Instrumentation
• Diagnostic Ultrasound

Background:

• Accurate measurement of blood flow in the aortic arch is crucial for assessing cardiac function.
• Non-invasive methods are desirable to reduce risks associated with traditional invasive techniques.
• The haemotachograph utilizes ultrasonic Doppler-shift principles for blood velocity assessment.

Purpose of the Study:

• To evaluate the accuracy of the haemotachograph, using transcutaneous aortovelography, in measuring blood velocity in the aortic arch.
• To compare the haemotachograph's measurements with standard invasive cardiac catheterization techniques.
• To assess the utility of transcutaneous aortovelography for monitoring changes in cardiac output over time.

Main Methods:

• The haemotachograph was used to measure blood velocity in the aortic arch in 20 patients.
• Transcutaneous aortovelography measurements were compared against stroke volume determined by invasive methods.
• Peak velocity measurements were also compared with data from a catheter tip electromagnetic velocity probe.

Main Results:

• A good proportional agreement was found between transcutaneous aortovelography and invasive stroke volume measurements.
• The accuracy of absolute flow values calculated using transcutaneous aortovelography and dimensional data was poor.
• Peak velocity measurements from transcutaneous aortovelography showed good agreement with invasive electromagnetic probe data.

Conclusions:

• Transcutaneous aortovelography is a valuable non-invasive technique for determining phasic blood flow velocity in the aortic arch.
• This method can be effectively used to track changes in cardiac output over time.
• While precise absolute flow quantification remains a challenge, the haemotachograph offers a promising non-invasive approach for hemodynamic monitoring.