Phase mapping from left ventricular radionuclide ventriculograms: interobserver reliability and accuracy of the...

Area of Science:

• Cardiology
• Nuclear Medicine
• Physiology

Background:

• Phase analysis of radionuclide ventriculography provides spatiotemporal data on ventricular emptying.
• This technique has the potential to identify abnormal ventricular contraction sequences and premature electromechanical activation sites.

Purpose of the Study:

• To evaluate a phase analysis program for tracing ventricular electromechanical activity using color-coded phase images.
• To assess the program's utility in detecting abnormal contraction patterns and localizing premature activation.

Main Methods:

• Utilized a phase analysis program based on the first harmonic Fourier transform of radionuclide ventriculography data.
• Analyzed 66 left ventricular phase images from six healthy baboons over 11 hours under anesthesia.
• Employed two independent observers to map ventricular emptying progression and assessed interobserver reliability.

Main Results:

• The phase analysis program demonstrated good interobserver reliability in mapping normal ventricular contraction patterns.
• The method consistently detected abnormalities that appeared during prolonged anesthesia.
• Abnormalities detected by phase analysis were confirmed with 12-lead electrocardiography.

Conclusions:

• Phase analysis of radionuclide ventriculography is a reliable tool for assessing ventricular mechanical function.
• The developed program accurately maps ventricular emptying and detects abnormal contraction sequences.
• This technique is valuable for identifying premature electromechanical activity and monitoring cardiac function during prolonged procedures.