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VOLUME 21 , ISSUE 9 ( 2017 ) > List of Articles

BRIEF COMMUNICATION

Prognostic value of venous to arterial carbon dioxide difference during early resuscitation in critically ill patients with septic shock

Tamer Helmy, Ehab El-reweny, Farahat Ghazy

Keywords : Acute Physiology and Chronic Health Evaluation II score, lactate, partial pressure carbon dioxide gap

Citation Information : Helmy T, El-reweny E, Ghazy F. Prognostic value of venous to arterial carbon dioxide difference during early resuscitation in critically ill patients with septic shock. Indian J Crit Care Med 2017; 21 (9):589-593.

DOI: 10.4103/ijccm.IJCCM_64_16

License: CC BY-ND 3.0

Published Online: 01-12-2015

Copyright Statement:  Copyright © 2017; The Author(s).


Abstract

Context: The partial pressure of venous to arterial carbon dioxide gradient (PCO2gap) is considered as an alternative marker of tissue hypoperfusion and has been used to guide treatment for shock. Aims: The aim of this study was to investigate the prognostic value of venous-to-arterial carbon dioxide difference during early resuscitation of patients with septic shock and compared it with that of lactate clearance and Acute Physiology and Chronic Health Evaluation II (APACHE-II) score. Settings and Design: Forty patients admitted to one Intensive Care Unit were enrolled. Subjects and Methods: APACHE-II score was calculated on admission. An arterial blood gas, central venous, and lactate samples were obtained on admission and after 6 h, and lactate clearance was calculated. Patients were classified retrospectively into Group I (survivors) and Group II (nonsurvivors). Pv-aCO2difference in the two groups was evaluated. Statistical Analysis Used: Data were fed to the computer and analyzed using IBM SPSS software package version 20.0. Results: At T0, Group II showed high PCO2gap (8.37 ± 1.36 mmHg) than Group I (7.55 ± 0.95 mmHg) with statistically significant difference (P = 0.030). While at T6, Group II showed higher PCO2gap (9.48 ± 1.47 mmHg) with statistically significant difference (P < 0.001) and higher mean lactate values (62.71 ± 23.66 mg/dl) with statistically significant difference (P < 0.001) than Group I where PCO2gap and mean lactate values became much lower, 5.91 ± 1.12 mmHg and 33.61 ± 5.80 mg mg/dl, respectively. Group I showed higher lactate clearance (25.42 ± 6.79%) with statistically significant difference (P < 0.001) than Group II (−69.40–15.46%). Conclusions: High PCO2gap >7.8 mmHg after 6 h from resuscitation of septic shock patients is associated with high mortality.

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