Perfusion index has been shown to help clinicians predict illness severity and early adverse respiratory outcomes in neonates, predict low superior vena cava flow in very low birth weight infants, provide an early indicator of sympathectomy after epidural anesthesia, and improve detection of critical congenital heart disease in newborns.
Appropriate fluid levels are vital to reducing postoperative risks and improving patient outcomes: fluid volumes that are too low under-hydration or too high over-hydration have been shown to decrease wound healing and increase the risk of infection or cardiac complications.
Annales Françaises d'Anesthésie et de Réanimation.
The accuracy of pulse oximetry deteriorates considerably for readings below 80%.
Vasodilation and pooling of venous blood in the head due to compromised venous return to the plethysmogram can cause a combination of arterial and venous pulsations in the forehead region and lead to spurious Sp O 2 results.
In one study, retinopathy of prematurity eye damage was reduced by 58% in very low birth weight neonates at a center using signal extraction technology, while there was no decrease in retinopathy of prematurity at another center with the same clinicians using the same protocol but with non-signal plethysmogram technology.
Whole-body plethysmography is used to measure respiratory parameters in conscious unrestrained subjects, including quantification of bronchoconstriction . The standard plethysmograph sizes are for the study of mice, rats and guinea pigs. On request, larger plethysmographs can also be manufactured for other animals, such as rabbits, dogs, pigs.
Plethysmography. Plethysmography is a noninvasive method of estimating changes in volume in an extremity.13 Because all other tissues maintain constant volume during the short period of testing, any recorded volumetric differences reflect changes in blood volume. Several plethysmographic techniques with different sensors have been used to.
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