Fig. 3: Schematic representation of the different elements of CARDIOVECTOR. | npj Microgravity

Fig. 3: Schematic representation of the different elements of CARDIOVECTOR.

From: Evidence of effective cardiovascular countermeasures during spaceflights: insights from wearable monitoring

Fig. 3

a Impedance cardiography (ICG) current electrodes; b ICG measuring electrodes; c Main unit (connection and amplification); d Seismocardiography (SCG) sensor at the cardiac apex (dorsoventral linear accelerations); e Plethysmography sensor (nasal thermistor); f ECG signal and its fiducial points; g SCG signal, its fiducial points (MC Mitral Closure, AO Aortic Opening, AC Aortic Closure, MO Mitral Opening), and cardiac time intervals (PEP Pre-ejection Period, LVET Left Ventricular Ejection Time, IVCT Isovolumetric Contraction Time, IVRT Isovolumetric Relaxation Time); h ICG signal and its fiducial points (B point: onset of left ventricular ejection, C point or \(\frac{{\rm{dZ}}({\rm{t}})}{{{\rm{dt}}}_{\max }}\) : the maximum rate of impedance change during systole, and X point: the onset of aortic valve closure).

Back to article page