VECTAN II: A computer program for the spatial analysis of the vectorcardiogram

Area of Science:

• Cardiovascular physiology
• Biomedical engineering
• Computational biology

Background:

• Traditional vectorcardiogram (VCG) analysis often uses scalar or planar representations.
• Previous waveform recognition algorithms have limitations in accuracy and scope.
• Assessing cardiac function during physiological stress requires precise quantitative methods.

Purpose of the Study:

• To introduce VECTAN II, a digital computer program for advanced spatial analysis of the vectorcardiogram.
• To present a novel waveform recognition algorithm based on spatial vector length for enhanced VCG analysis.
• To quantify the VCG response of normal subjects during controlled stress experiments.

Main Methods:

• Developed VECTAN II, a digital program employing a unique spatial vector length-based waveform recognition algorithm.
• Analyzed the vectorcardiogram as a three-dimensional entity, moving beyond scalar or planar interpretations.
• Monitored VCG complexes every five seconds during prolonged stress experiments to capture dynamic cardiac changes.

Main Results:

• The VECTAN II program demonstrated superior performance compared to previous VCG analysis algorithms.
• Successfully quantified cardiac responses in normal subjects under controlled stress conditions.
• Provided valuable data from astronaut health examinations (Apollo missions, Skylab) for cardiovascular research.

Conclusions:

• VECTAN II offers a more comprehensive and accurate method for spatial vectorcardiogram analysis.
• The program's 3D approach and novel algorithm enhance the understanding of cardiac dynamics.
• VECTAN II has proven utility in both controlled laboratory settings and critical aerospace medical evaluations.