Pain
PDR, tetanic, Pain, pain
CONSTRICTION, SEQUELAE
Pain will be quantified with a pressure algometer + pupilometer in older patients with post-COVID-19 sequelae.Pupilometer: The pupillary dilatation reflex (PDR) mode allows monitoring the variation of the pupil in real time during the application of a stimulus and during a maximum of 60 s.The FLASH mode of the pupilometer, pupillary luminic reflex (PLR) allows evaluation of the reflex of pupilar constriction by a flash of light of 320 lumens during 1 s.The pain pupillary index (PPI) mode uses standardized electrical stimulation that increases by 10 in 10 mA (initiating the stimulus in 10 mA up to 60 mA).Parameters of the pupilometer: basal and maximum diameter of the pupil, percentage of variation of pupil diameter (in %), variation of the pupil in mm and intensity of reflex of dilatation, latency.The pain threshold, subjective response to different painful stimuli, and objective response obtained after tetanic stimulation of the median nerve will be measured.Pressure algometer: This commercial apparatus allows the application of a controlled and quantifiable nociceptive stimulus on a body surface.Algometers apply a pressure stimulus that can be useful for applying a standardized painful stimulus, having a different nature from that applied with the pupilometer which is a stimulus of electric origin.