Minute ventilation to carbon dioxide production ratio is a simple and non-invasive index of ventilatory inefficiency in mechanically ventilated patients: proof of concept

2017 ◽  
Vol 43 (10) ◽  
pp. 1542-1543
Author(s):  
René López ◽  
Iván Caviedes ◽  
Jerónimo Graf
Keyword(s):  
Carbon Dioxide ◽  
Minute Ventilation ◽  
Carbon Dioxide Production ◽  
Proof Of Concept ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Non Invasive ◽  
Production Ratio ◽  
Ventilated Patients

Relationship between Cr and breathing pattern in mechanically ventilated patients

1994 ◽  
Vol 77 (6) ◽  
pp. 2703-2708 ◽  
Author(s):  
H. Burnet ◽  
M. Bascou-Bussac ◽  
C. Martin ◽  
Y. Jammes
Keyword(s):  
Linear Regression ◽  
Tidal Volume ◽  
Multiple Linear Regression ◽  
Breathing Pattern ◽  
Minute Ventilation ◽  
Respiratory Frequency ◽  
Upper Airways ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Ventilated Patients

In mechanically ventilated patients the natural gas-conditioning process of the upper airways is bypassed by the use of an endotracheal tube or a tracheostomy. We hypothesized that under these conditions the breathing pattern may greatly influence the convective respiratory heat loss (Cr). Cr values were computed from minute ventilation (VE) and inspiratory and expiratory gas temperatures, which were measured in six patients under mechanical ventilation for the management of cranial trauma. In each patient the effects of 11–20 different breathing patterns were investigated. Relationships between Cr and VE and between combined tidal volume and respiratory frequency were obtained by simple and multiple linear regression methods, respectively. Comparison of the standard errors of estimate indicated that multiple linear regression gives the best fit. Thus, Cr was highly dependent on the breathing pattern and was not related only to VE. For the same VE value, Cr was higher when VE was achieved with high tidal volume and low respiratory frequency. These data are consistent with previous studies in which thermal exchanges through the upper airways were taxed by hyperventilation of frigid air.

Prognostic Comparison of the Minute Ventilation/Carbon Dioxide Production Ratio and Slope in Patients with Heart Failure

Heart Drug ◽  
2004 ◽  
Vol 4 (3) ◽  
pp. 133-139 ◽  
Author(s):  
Ross Arena ◽  
Jonathan Myers ◽  
Syed Salman Aslam ◽  
Elsa B. Varughese ◽  
Mary Ann Peberdy
Keyword(s):  
Heart Failure ◽  
Carbon Dioxide ◽  
Minute Ventilation ◽  
Carbon Dioxide Production ◽  
Production Ratio ◽  
Patients With Heart Failure
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