However, because of the changes in venous tone, intrathoracic pressures (positive end expiratory pressure, etc.), left and right ventricular compliance and geometry that occur in critically ill ...

Changes in vascular tone disrupt the mechanotransduction and affect the glycocalyx and vascular permeability. Inflammatory reactions in the vessel wall cause structural degradation and disruption ...

you could have more visible veins than someone with a darker skin tone. Physical activity can also influence the appearance ...