Transcutaneous monitoring of partial pressure of carbon dioxide in the elderly patient: a prospective, clinical comparison with end-tidal monitoring

2007 ◽  
Vol 2007 ◽  
pp. 280-281
Author(s):  
H.T. Lee
Keyword(s):  
Carbon Dioxide ◽  
Elderly Patient ◽  
Partial Pressure ◽  
The Elderly ◽  
Clinical Comparison ◽  
Transcutaneous Monitoring ◽  
End Tidal

Transcutaneous monitoring of partial pressure of carbon dioxide in the elderly patient: a prospective, clinical comparison with end-tidal monitoring

2006 ◽  
Vol 18 (6) ◽  
pp. 436-440 ◽  
Author(s):  
Andrea Casati ◽  
Grazia Squicciarini ◽  
Giulia Malagutti ◽  
Marco Baciarello ◽  
Marta Putzu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Elderly Patient ◽  
Partial Pressure ◽  
The Elderly ◽  
Clinical Comparison ◽  
Transcutaneous Monitoring ◽  
End Tidal

The Ventilatory Response to Hypoxia Below the Carbon Dioxide Threshold

1997 ◽  
Vol 22 (1) ◽  
pp. 23-36 ◽  
Author(s):  
Theodore Rapanos ◽  
James Duffin
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Ventilatory Response ◽  
Pressure Threshold ◽  
Partial Pressures ◽  
Progressive Hypoxia ◽  
End Tidal ◽  
Peripheral Chemoreflex ◽  
Ventilatory Response To Hypoxia ◽  
Lower Carbon

The ventilatory response to acute progressive hypoxia below the carbon dioxide threshold using rebreathing was investigated. Nine subjects rebreathed after 5 min of hyperventilation to lower carbon dioxide stores. The rebreathing bag initially contained enough carbon dioxide to equilibrate alveolar and arterial partial pressures of carbon dioxide to the lowered mixed venous partial pressure (≈ 30 mmHg), and enough oxygen to establish a chosen end-tidal partial pressure (50-70 mmHg), within one circulation time. During rebreathing, end-tidal partial pressure of carbon dioxide increased while end-tidal partial pressure of oxygen fell. Ventilation increased linearly with end-tidal carbon dioxide above a mean end-tidal partial pressure threshold of 39 ± 2.7 mmHg. Below this peripheral-chemoreflex threshold, ventilation did not increase, despite a progressive fall in end-tidal oxygen partial pressure to a mean of 37 ± 4.1 mmHg. In Conclusion, hypoxia does not stimulate ventilation when carbon dioxide is below its peripheral-chemoreflex threshold. Key words: peripheral chemoreflex, rebreathing technique, hyperventilation

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