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Titolo:
PARTIAL CARBON-DIOXIDE REBREATHING - A RELIABLE TECHNIQUE FOR NONINVASIVE MEASUREMENT OF NONSHUNTED PULMONARY CAPILLARY BLOOD-FLOW
Autore:
DEABREU MG; QUINTEL M; RAGALLER M; ALBRECHT DM;
Indirizzi:
TECH UNIV DRESDEN,CLIN CARL GUSTAV CARUS,CLIN ANESTHESIOL & INTENS CARE MED,FETSCHERSTASSE 74 D-01307 DRESDEN GERMANY UNIV HEIDELBERG,FAC CLIN MED MANNHEIM,INST ANESTHESIOL & INTENS CARE MED HEIDELBERG GERMANY
Titolo Testata:
Critical care medicine
fascicolo: 4, volume: 25, anno: 1997,
pagine: 675 - 683
SICI:
0090-3493(1997)25:4<675:PCR-AR>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SERIOUSLY ILL PATIENTS; CARDIAC-OUTPUT; ARTERY CATHETERIZATION; GAS-EXCHANGE; COMPLICATION;
Keywords:
CARDIAC OUTPUT; PULMONARY CAPILLARY BLOOD FLOW; NONINVASIVE MEASUREMENT; GAS COLLECTION; BREATH-BY-BREATH ANALYSIS; PARTIAL CO2 REBREATHING; THERMODILUTION; PULMONARY ARTERY CATHETER; LUNG ATELECTASIS; ADULT RESPIRATORY DISTRESS SYNDROME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M.G. Deabreu et al., "PARTIAL CARBON-DIOXIDE REBREATHING - A RELIABLE TECHNIQUE FOR NONINVASIVE MEASUREMENT OF NONSHUNTED PULMONARY CAPILLARY BLOOD-FLOW", Critical care medicine, 25(4), 1997, pp. 675-683

Abstract

Objective: To determine the validity and clinical utility of the partial CO2 rebreathing technique for measurement of nonshunted pulmonary capillary blood flow and cardiac output. Design: Prospective, controlled animal laboratory investigation and clinical trial. Settings: Animal research facility and intensive care unit of a university hospital. Subjects: Fifteen adult sheep, weighing 58 to 78 kg. Patients: Mechanically ventilated patients with different underlying diseases (n = 12) and with adult respiratory distress syndrome (ARDS) (n = 8). Interventions: CO2 elimination rate ((V)over dot co(2)) was measured breath-by breath with a system developed for the study and also by gas collection (validation procedure in patients with different underlying diseases). partial CO2 rebreathing maneuvers, cardiac output by thermodilution, and blood gas analysis were performed in sheep with lung atelectasisand in patients with ARDS. Measurements and Main Results: The degree of correlation between (V)over dot co(2), measured with the system developed and gas collection was very good (r(2) = .95, p < .0001), and bias and precision calculations (1 +/- 9 mL/min) showed close agreementbetween methods. The overall degree of correlation between partial CO2 rebreathing measurements and cardiac output was moderate (r(2) = .54, p < .0001), the noninvasive method tending to underestimate cardiac output, as shown by bias and precision calculations (-1.69 +/- 1.90 L/min). In contrast, the overall degree of correlation between partial CO2 rebreathing measurements and nonshunted pulmonary capillary blood flow was good (r(2) = .73, p < .0001). Bias and precision calculations (0.25 +/- 0.83 L/min) showed a tendency for the partial CO2 rebreathing technique to slightly overestimate pulmonary capillary blood flow. Variance differences between partial CO2 rebreathing measurements and cardiac output could be mostly explained by intrapulmonary right-to-left shunt fraction (r(2) = .51, p < .0001). Conclusions: Our results support the use of the system developed for breath-by-breath (V)over dot co(2), measurements. The tack of agreement between partial CO2 rebreathing measurements and cardiac output was mostly explained by intrapulmonary right-to-left shunt, suggesting that this technique may not be appropriate for monitoring cardiac output in patients with increased venous admixture. In contrast, our results demonstrate that the partial CO2 rebreathing technique is reliable for measurement of the effectivenonshunted pulmonary capillary brood flow. This technique may prove useful to guide ventilatory therapy adjustments in an attempt to optimize nonshunted pulmonary capillary blood flow.

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Documento generato il 09/08/20 alle ore 17:25:18