Document Detail

Optoelectronic plethysmography in intensive care patients.
MedLine Citation:
PMID:  10806152     Owner:  NLM     Status:  MEDLINE    
We used optoelectronic plethysmography to study 11 normal subjects during quiet and deep breathing, six sedated and paralyzed patients with acute lung injury and acute respiratory distress syndrome (ALI/ARDS) receiving continuous positive pressure ventilation (CPPV) (positive end-expiratory pressure [PEEP] = 10 cm H(2)O, tidal volume [VT] = 300, 600, 900 ml), and seven ALI/ARDS patients receiving pressure support ventilation (PSV) (PEEP 10 cm H(2)O, pressure support = 5, 10, 15, 25 cm H(2)O). The volumes measured using optoelectronic plethysmography were compared with measurements taken using spirometry and pneumotachography. The three methods were highly correlated. The discrepancies found were 1.7 +/- 5.9%, -1.6 +/- 5.4%, and 4.9 +/- 6.4% when comparing optoelectronic plethysmography with spirometry, optoelectronic plethysmography with pneumotachography, and spirometry with pneumotachography, respectively. Accuracy of the compartmentalization procedure (upper thorax, lower thorax, and abdomen) was assessed by calculating compartmental volume changes during isovolume maneuvers. The discrepancy from the ideal zero line was -2.1 +/- 48.3 ml. Abdominal contribution to inspired volume was greater for normal subjects than for PSV patients (63 +/- 11% versus 43 +/- 14%, p < 0.001). It decreased with VT for normal subjects (48.5 +/- 15%, p < 0.05), whereas it increased for CPPV patients (61 +/- 10%, p < 0.05). No significant distribution differences were found between 5 and 25 cm H(2)O PSV. We conclude that optoelectronic plethysmography is a feasible technique able to provide unique data on the distribution of chest wall volume changes in intensive care patients.
A Aliverti; R Dellacá; P Pelosi; D Chiumello; A Pedotti; L Gattinoni
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of respiratory and critical care medicine     Volume:  161     ISSN:  1073-449X     ISO Abbreviation:  Am. J. Respir. Crit. Care Med.     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-06-21     Completed Date:  2000-06-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9421642     Medline TA:  Am J Respir Crit Care Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1546-52     Citation Subset:  AIM; IM    
Dipartimento di Bioingegneria, Politecnico di Milano, Italy.
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MeSH Terms
Aged, 80 and over
Intensive Care Units
Lung Volume Measurements
Middle Aged
Plethysmography* / methods
Positive-Pressure Respiration
Respiration, Artificial
Respiratory Distress Syndrome, Adult / physiopathology*,  therapy
Thorax / physiopathology*

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