Mass Spectrometer Monitoring of Patients with Regional Anesthesia

Ibarra, Eduardo; Lees, David Eric

doi:10.1097/00000542-198511000-00035

Cited by 15 publications

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“…Continuous noninvasive capnometric monitoring of alveolar ventilation in mechanically ventilated patients is a widely accepted clinical practice [11] and has also been described for monitoring of spontaneous respiration in intubated intensive care patients [10]. However, few data are available on capnometric monitoring in nonintubated, spontaneously breathing patients, although several methods of expiratory CO2 measurement have been described [12][13][14][15][16][17].…”

Section: Discussionmentioning

confidence: 99%

Capnometry for continuous postoperative monitoring of nonintubated, spontaneously breathing patients

Lenz

Heipertz

Epple

1991

J Clin Monitor Comput

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We continuously monitored spontaneous respiration after extubation by end-tidal CO2 tension (PETCO2) in 19 patients aged 20 to 72 years who had undergone major operations. The respiratory gas was sampled from the nasopharynx via a special nasal catheter and analyzed by a side-stream analyzer. In each case, optimal placement of the nasal catheter was determined by CO2 waveform and the capnograms were recorded for waveform analysis and trend monitoring. PETCO2 was compared with arterial CO2 tension (PaCO2) two to four times during the 2- to 19-hour observation periods by simultaneous measurements. For 65 simultaneous measurements, mean PETCO2 was 38.9 +/- 5.7 mm Hg (range, 26.3 to 48.3 mm Hg) and mean PaCO2 was 38.9 +/- 5.7 mm Hg (range, 26.8 to 46.0 mm Hg; r = 0.82; p less than 0.01). While the mean values for PETCO2 and PaCO2 were similar, several patients had large differences for PaCO2 to PETCO2. The differences of the individual patients did not differ significantly between the various times of measurement. We conclude that this form of capnometry is well suited for continuous, noninvasive monitoring of respiration in nonintubated, spontaneously breathing patients.

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Section: Discussionmentioning

confidence: 99%

Capnometry for continuous postoperative monitoring of nonintubated, spontaneously breathing patients

Lenz

Heipertz

Epple

1991

J Clin Monitor Comput

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Monitoring der Respiration

Pasch¹

1992

Der Kardiale Risikopatient in Der Operativen Medizin

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Accurate determination of end-tidal carbon dioxide during administration of oxygen by nasal cannulae

Bowe

Boysen

Broome

et al. 1989

J Clin Monitor Comput

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Measurement of end-tidal carbon dioxide tension (PETCO2) by mass spectrometry or infrared capnometry provides a clinically useful approximation of arterial carbon dioxide tension (PaCO2) in intubated patients. Although several devices have been proposed to sample PETCO2 during spontaneous breathing (i.e., unintubated patients receiving supplemental oxygen), thus far no reports have documented their efficacy. This article reports the use of an easily constructed modification of simple nasal cannulae that permits accurate sampling of PETCO2 during oxygen administration to unintubated patients. After amputation of the closed tip, a cap from a syringe was inserted via a slit made at the base into one prong of a pair of nasal cannulae. A capnometer was connected to the syringe cap, and PETCO2 and PaCO2 were determined simultaneously during the administration of 3 L/min oxygen via nasal cannulae to 21 normocapnic patients. The PaCO2 - PETCO2 gradients were calculated and compared with values obtained in the same patients after intubation and mechanical ventilation. No significant difference was found between the calculated gradients with nasal cannulae (2.09 +/- 2.18 mm Hg) versus intubation (2.87 +/- 2.82 mm Hg). Simultaneous oxygen administration and accurate sampling of PETCO2 may be achieved in unintubated patients by using this easily constructed modification of nasal cannulae.

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Mass Spectrometer Monitoring of Patients with Regional Anesthesia

Cited by 15 publications

References 0 publications

Capnometry for continuous postoperative monitoring of nonintubated, spontaneously breathing patients

Capnometry for continuous postoperative monitoring of nonintubated, spontaneously breathing patients

Monitoring der Respiration

Accurate determination of end-tidal carbon dioxide during administration of oxygen by nasal cannulae

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