PURPOSE: Noninvasive methods that could predict preload responsiveness are lacking. Our objective was to evaluate variations in pulse oximetry plethysmographic (POP) waveform amplitude (deltaPOP) induced by passive leg raising (PLR). METHODS: We attached a pulse oximeter to the middle finger of 25 spontaneously breathing volunteers at several time points: baseline (ie, semirecumbent position), during PLR at 60 degrees while each subject's trunk was lowered in a supine position at 1 minute, and after putting the patient back in the semirecumbent position (5-minute rest). Heart rate, noninvasive arterial pressures (mean arterial pressure and pulse pressure), maximal POP (POPmax), minimal POP (POPmin), and deltaPOP defined as [POPmax - POPmin]/[(POPmax + POPmin)/2] were recorded using a monitor. RESULTS: Heart rate, mean arterial pressure, pulse pressure, POPmax, and POPmin values were not different at baseline, during PLR at 1 minute, and after the 5-minute rest (repeated-measures analysis of variance). The median deltaPOP significantly decreased from 16% (95% confidence interval = 11%-23%) to 11% (95% confidence interval = 8%-14%) (P < .05) and then increased to 13% (95% confidence interval = 10%-21%) after the 5-minute rest (P = nonsignificant). CONCLUSION: Passive leg raising induces a significant decrease in deltaPOP among spontaneously breathing volunteers.
PURPOSE: Noninvasive methods that could predict preload responsiveness are lacking. Our objective was to evaluate variations in pulse oximetry plethysmographic (POP) waveform amplitude (deltaPOP) induced by passive leg raising (PLR). METHODS: We attached a pulse oximeter to the middle finger of 25 spontaneously breathing volunteers at several time points: baseline (ie, semirecumbent position), during PLR at 60 degrees while each subject's trunk was lowered in a supine position at 1 minute, and after putting the patient back in the semirecumbent position (5-minute rest). Heart rate, noninvasive arterial pressures (mean arterial pressure and pulse pressure), maximal POP (POPmax), minimal POP (POPmin), and deltaPOP defined as [POPmax - POPmin]/[(POPmax + POPmin)/2] were recorded using a monitor. RESULTS: Heart rate, mean arterial pressure, pulse pressure, POPmax, and POPmin values were not different at baseline, during PLR at 1 minute, and after the 5-minute rest (repeated-measures analysis of variance). The median deltaPOP significantly decreased from 16% (95% confidence interval = 11%-23%) to 11% (95% confidence interval = 8%-14%) (P < .05) and then increased to 13% (95% confidence interval = 10%-21%) after the 5-minute rest (P = nonsignificant). CONCLUSION: Passive leg raising induces a significant decrease in deltaPOP among spontaneously breathing volunteers.
Authors: Richard Zhu; Gourg Atteya; Kirk H Shelley; David G Silverman; Aymen A Alian Journal: J Clin Monit Comput Date: 2014-01-14 Impact factor: 2.502
Authors: Paul S Addison; James N Watson; Michael L Mestek; James P Ochs; Alberto A Uribe; Sergio D Bergese Journal: J Clin Monit Comput Date: 2014-05-06 Impact factor: 2.502
Authors: Tom Peachey; Andrew Tang; Elinor C Baker; Jason Pott; Yonathan Freund; Tim Harris Journal: Scand J Trauma Resusc Emerg Med Date: 2016-09-02 Impact factor: 2.953