Abstract
InfrasondeR (Sphyngometrics), a small, lightweight (6.2 lbs), battery-powered, indirect blood pressure system was tested under a variety of clinical conditions in neonates. This system consists of a passive transducer (lxl cm) placed under a disposable cuff which electronically senses arterial wall oscillations on a narrow subaudible (infrasonic) frequency band thereby improving accuracy by increasing the signal to noise ratio.
Ten neonates (1360 to 4500 gms), catheterized for medical reasons (RDS, shock, sepsis), were studied. Approximately 20 readings each by experienced and inexperienced personnel were made on the right arm, left arm, and one leg, simultaneously recording the direct transducer pressure from an arterial catheter attached to a KDC monitor at the exact moment that the Infrasonde reading was taken. Comparing absolute differences between the Infrasonde and the direct arterial pressure over a wide range (diastolic 18 to 60 mm Hg, systolic 38 to 105 mm Hg), we were unable to detect any difference between experienced and inexperienced personnel, right and left arms, and arms and legs; therefore all the readings were combined. The correlation coefficient between direct arterial and Infrasonde pressures was r=.900, n=113 diastolic and r=.940, n=113 systolic.
These data indicate that Infrasonde correlates well with direct arterial pressures and could be especially useful when there is no indwelling catheter present.
Article PDF
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fox, L., Phelps, D. 960 EVALUATION OF A NEW INDIRECT BLOOD PRESSURE SYSTEM FOR NEONATES. Pediatr Res 12 (Suppl 4), 524 (1978). https://doi.org/10.1203/00006450-197804001-00966
Issue Date:
DOI: https://doi.org/10.1203/00006450-197804001-00966