Table 1.

Expected changes with planned infusions

	Camera detecting changes	Expected changes with infusions
		Phenylephrine	Glyceryl trinitrate
Skin colour	Red/Green/Blue visible spectrum camera	Pale skin, reduced red tone with vessel constriction	Increase in red tone with vessel dilation
Skin temperature	Thermographic camera	Reduced temperature and thermal signal	Increased temperature and thermal signal
Skin perfusion	Laser speckle contrast imager	Reduced perfusion/flux	Increased perfusion/flux
Pulsatility	Red/green/blue visible spectrum camera	Reduced pulsatility in image plethysmography	Increased pulsatility in image plethysmography