Document Detail

Assessment of a new piezoelectric transducer sensor for noninvasive cardiorespiratory monitoring of newborn infants in the NICU.
MedLine Citation:
PMID:  20234143     Owner:  NLM     Status:  In-Process    
BACKGROUND: Electrocardiogram (ECG) and impedance pneumography (IPG), the most widely used techniques for cardiorespiratory monitoring in the neonatal intensive care unit (NICU), have the disadvantage of causing skin damage when used for very premature newborn infants. To prevent skin damage, we designed a new piezoelectric transducer (PZT) sensor. OBJECTIVE: To assess the potential of the PZT sensor for cardiorespiratory monitoring in the NICU. METHODS: The PZT sensor was placed under a folded towel under a neonate to detect an acoustic cardiorespiratory signal, from which heart rate (HR) and breathing rate (BR) were calculated, together with simultaneous ECG/IPG recording for 1-9 days for long and brief (1-min) assessment. RESULTS: The brief assessment showed average correlation coefficients of 0.92 +/- 0.12 and 0.95 +/- 0.02 between instantaneous HRs/BRs detected by the PZT sensor and ECG/IPG in 27 and 11 neonates examined. During the long assessment, the HR detection rate by the PZT sensor was approximately 10% lower than that by ECG (82.6 +/- 12.9 vs. 91.8 +/- 4.1%; p = 0.001, n = 27), although comparable (90.3 +/- 4.1 vs. 92.5 +/- 3.4%, p = 0.081) in approximately 70% (18/27) of neonates examined; BR detection rate was comparable between the PZT sensor and IPG during relatively stable signal conditions (95.9 +/- 4.0 vs. 95.3 +/- 3.5%; p = 0.38, n = 11). The PZT sensor caused neither skin damage nor body movement increase in all neonates examined. CONCLUSION: The PZT sensor is noninvasive and does not cause skin irritation, and we believe it does provide a reliable, accurate cardiorespiratory monitoring tool for use in the NICU, although the issue of mechanical-ventilation noise remains to be solved.
Shinichi Sato; Wako Ishida-Nakajima; Akira Ishida; Masanari Kawamura; Shinobu Miura; Kyoichi Ono; Nobuya Inagaki; Goro Takada; Tsutomu Takahashi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-16
Journal Detail:
Title:  Neonatology     Volume:  98     ISSN:  1661-7819     ISO Abbreviation:  Neonatology     Publication Date:  2010  
Date Detail:
Created Date:  2010-08-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101286577     Medline TA:  Neonatology     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  179-90     Citation Subset:  IM    
Copyright Information:
Copyright 2010 S. Karger AG, Basel.
Department of Cell Physiology, Akita University Graduate School of Medicine, Akita, Japan.
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