[Comparative clinical evaluation of left ventricular ejection time using carotid and ear pulses]

Area of Science:

• Cardiology
• Biomedical Engineering
• Physiology

Background:

• Accurate measurement of left ventricular ejection time (LVET) is crucial for cardiovascular assessment.
• Carotid pulse waveform analysis is a standard method for determining LVET.
• Ear densitography offers a potentially non-invasive alternative for cardiovascular monitoring.

Purpose of the Study:

• To evaluate the constancy of the relationship between carotid pulse morphology and ear densitogram morphology.
• To validate the measurement of left ventricular ejection time (LVET) using ear densitography.
• To determine if ear densitography can reliably substitute for carotid pulse measurements in clinical settings.

Main Methods:

• Simultaneous recording of carotid pulse and ear densitogram in 92 subjects (aged 5-84 years).
• Electronic processing of ear densitograms using three different filters to mimic carotid pulse.
• Comparison of LVET measurements obtained from carotid pulse and processed ear densitograms using analysis of variance.

Main Results:

• No statistically significant differences were found among LVET measurements from the carotid pulse and the three filtered ear densitogram methods.
• Mean LVET values were consistent across all measurement techniques (carotid pulse: 265.5 ± 24.87 msec; ear densitography: 265.7 ± 24.19, 265.2 ± 24.25, 266.2 ± 24.78 msec).
• The study demonstrated a consistent relationship between carotid pulse and ear densitogram morphology in clinical measurements.

Conclusions:

• The ear densitogram provides a reliable and constant measure of left ventricular ejection time.
• Ear densitography can be used as a valid substitute for carotid pulse measurements in clinical practice.
• This non-invasive technique enhances cardiovascular monitoring capabilities.