Concordance of end-tidal carbon dioxide and arterial carbon dioxide in severe traumatic brain injury.

Sung Woo Lee, Yun Sik Hong, Chul Han, Su Jin Kim, Sung Woo Moon, Jung Ho Shin, Kwang Je Baek

Research output: Contribution to journalArticle

Abstract

OBJECTIVE: It is important for preventing hyperventilation so as to improve the outcomes of patients with severe traumatic brain injuries. End-tidal CO2 (Petco2) reflects arterial CO2 (Paco2), noninvasively and continuously. The aim of this study is to examine the concordance between Paco2 and Petco2 among adults presenting to the emergency department with severe traumatic brain injury and to elucidate the patient groups who had discordance. METHODS: From July 1, 2006 to December 31, 2007, 77 patients who presented in the emergency department of the hospital after severe brain injury were enrolled. Glasgow Coma Scale, blood pressure, heart rate, respiration rate, body temperature, arterial blood gas variables, and serum lactate levels were measured under the mechanical ventilation support. Finally, Injury Severity Score and Abbreviated Injury Scale of head and chest were recorded. The concordance between Petco2 and Paco2 was analyzed using Bland-Altman plot. We defined that normal gap of Paco2 and Petco2 [P(a-et)co2] is -5 mm Hg to 5 mm Hg, and compared the normal and high P(a-et)co2 groups to find the factors affecting the P(a-et)co2. RESULTS: Sixty-six patients after exception of 11 patients with nontraumatic brain injury were analyzed. Ten patients (15.2%) were below 30 mm Hg of Paco2. Pearson's correlation coefficient between Paco2 and Petco2 was 0.666 (p < 0.001) and the concordance between Paco2 and Petco2 was 77.3%. The patients with high P(a-et)co2 showed significantly higher Injury Severity Score, lower systolic blood pressure, lower arterial pH, lower base deficit, and higher serum lactate levels than patients with normal P(a-et)co2. Patients with severe chest trauma, hypotension, and metabolic acidosis increased the risk of the discordance between Paco2 and Petco2. Twenty-eight patients who had no hypotension, no metabolic acidosis, and no severe chest trauma showed concordance rate of 100.0% between Paco2 and Petco2. CONCLUSIONS: Severe chest trauma and hemodynamic and tissue perfusion state should be considered when attempting to monitor the hyperventilation in severe brain injury patients using Petco2.

Original languageEnglish
Pages (from-to)526-530
Number of pages5
JournalThe Journal of trauma
Volume67
Issue number3
Publication statusPublished - 2009 Sep 1

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Carbon Dioxide
Thorax
Brain Injuries
Injury Severity Score
Hyperventilation
Blood Pressure
Acidosis
Hypotension
Hospital Emergency Service
Lactic Acid
Wounds and Injuries
Traumatic Brain Injury
Abbreviated Injury Scale
Glasgow Coma Scale
Respiratory Rate
Body Temperature
Serum
Artificial Respiration
Perfusion
Heart Rate

ASJC Scopus subject areas

  • Surgery
  • Critical Care and Intensive Care Medicine

Cite this

Concordance of end-tidal carbon dioxide and arterial carbon dioxide in severe traumatic brain injury. / Lee, Sung Woo; Hong, Yun Sik; Han, Chul; Kim, Su Jin; Moon, Sung Woo; Shin, Jung Ho; Baek, Kwang Je.

In: The Journal of trauma, Vol. 67, No. 3, 01.09.2009, p. 526-530.

Research output: Contribution to journalArticle

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abstract = "OBJECTIVE: It is important for preventing hyperventilation so as to improve the outcomes of patients with severe traumatic brain injuries. End-tidal CO2 (Petco2) reflects arterial CO2 (Paco2), noninvasively and continuously. The aim of this study is to examine the concordance between Paco2 and Petco2 among adults presenting to the emergency department with severe traumatic brain injury and to elucidate the patient groups who had discordance. METHODS: From July 1, 2006 to December 31, 2007, 77 patients who presented in the emergency department of the hospital after severe brain injury were enrolled. Glasgow Coma Scale, blood pressure, heart rate, respiration rate, body temperature, arterial blood gas variables, and serum lactate levels were measured under the mechanical ventilation support. Finally, Injury Severity Score and Abbreviated Injury Scale of head and chest were recorded. The concordance between Petco2 and Paco2 was analyzed using Bland-Altman plot. We defined that normal gap of Paco2 and Petco2 [P(a-et)co2] is -5 mm Hg to 5 mm Hg, and compared the normal and high P(a-et)co2 groups to find the factors affecting the P(a-et)co2. RESULTS: Sixty-six patients after exception of 11 patients with nontraumatic brain injury were analyzed. Ten patients (15.2{\%}) were below 30 mm Hg of Paco2. Pearson's correlation coefficient between Paco2 and Petco2 was 0.666 (p < 0.001) and the concordance between Paco2 and Petco2 was 77.3{\%}. The patients with high P(a-et)co2 showed significantly higher Injury Severity Score, lower systolic blood pressure, lower arterial pH, lower base deficit, and higher serum lactate levels than patients with normal P(a-et)co2. Patients with severe chest trauma, hypotension, and metabolic acidosis increased the risk of the discordance between Paco2 and Petco2. Twenty-eight patients who had no hypotension, no metabolic acidosis, and no severe chest trauma showed concordance rate of 100.0{\%} between Paco2 and Petco2. CONCLUSIONS: Severe chest trauma and hemodynamic and tissue perfusion state should be considered when attempting to monitor the hyperventilation in severe brain injury patients using Petco2.",
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AU - Lee, Sung Woo

AU - Hong, Yun Sik

AU - Han, Chul

AU - Kim, Su Jin

AU - Moon, Sung Woo

AU - Shin, Jung Ho

AU - Baek, Kwang Je

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N2 - OBJECTIVE: It is important for preventing hyperventilation so as to improve the outcomes of patients with severe traumatic brain injuries. End-tidal CO2 (Petco2) reflects arterial CO2 (Paco2), noninvasively and continuously. The aim of this study is to examine the concordance between Paco2 and Petco2 among adults presenting to the emergency department with severe traumatic brain injury and to elucidate the patient groups who had discordance. METHODS: From July 1, 2006 to December 31, 2007, 77 patients who presented in the emergency department of the hospital after severe brain injury were enrolled. Glasgow Coma Scale, blood pressure, heart rate, respiration rate, body temperature, arterial blood gas variables, and serum lactate levels were measured under the mechanical ventilation support. Finally, Injury Severity Score and Abbreviated Injury Scale of head and chest were recorded. The concordance between Petco2 and Paco2 was analyzed using Bland-Altman plot. We defined that normal gap of Paco2 and Petco2 [P(a-et)co2] is -5 mm Hg to 5 mm Hg, and compared the normal and high P(a-et)co2 groups to find the factors affecting the P(a-et)co2. RESULTS: Sixty-six patients after exception of 11 patients with nontraumatic brain injury were analyzed. Ten patients (15.2%) were below 30 mm Hg of Paco2. Pearson's correlation coefficient between Paco2 and Petco2 was 0.666 (p < 0.001) and the concordance between Paco2 and Petco2 was 77.3%. The patients with high P(a-et)co2 showed significantly higher Injury Severity Score, lower systolic blood pressure, lower arterial pH, lower base deficit, and higher serum lactate levels than patients with normal P(a-et)co2. Patients with severe chest trauma, hypotension, and metabolic acidosis increased the risk of the discordance between Paco2 and Petco2. Twenty-eight patients who had no hypotension, no metabolic acidosis, and no severe chest trauma showed concordance rate of 100.0% between Paco2 and Petco2. CONCLUSIONS: Severe chest trauma and hemodynamic and tissue perfusion state should be considered when attempting to monitor the hyperventilation in severe brain injury patients using Petco2.

AB - OBJECTIVE: It is important for preventing hyperventilation so as to improve the outcomes of patients with severe traumatic brain injuries. End-tidal CO2 (Petco2) reflects arterial CO2 (Paco2), noninvasively and continuously. The aim of this study is to examine the concordance between Paco2 and Petco2 among adults presenting to the emergency department with severe traumatic brain injury and to elucidate the patient groups who had discordance. METHODS: From July 1, 2006 to December 31, 2007, 77 patients who presented in the emergency department of the hospital after severe brain injury were enrolled. Glasgow Coma Scale, blood pressure, heart rate, respiration rate, body temperature, arterial blood gas variables, and serum lactate levels were measured under the mechanical ventilation support. Finally, Injury Severity Score and Abbreviated Injury Scale of head and chest were recorded. The concordance between Petco2 and Paco2 was analyzed using Bland-Altman plot. We defined that normal gap of Paco2 and Petco2 [P(a-et)co2] is -5 mm Hg to 5 mm Hg, and compared the normal and high P(a-et)co2 groups to find the factors affecting the P(a-et)co2. RESULTS: Sixty-six patients after exception of 11 patients with nontraumatic brain injury were analyzed. Ten patients (15.2%) were below 30 mm Hg of Paco2. Pearson's correlation coefficient between Paco2 and Petco2 was 0.666 (p < 0.001) and the concordance between Paco2 and Petco2 was 77.3%. The patients with high P(a-et)co2 showed significantly higher Injury Severity Score, lower systolic blood pressure, lower arterial pH, lower base deficit, and higher serum lactate levels than patients with normal P(a-et)co2. Patients with severe chest trauma, hypotension, and metabolic acidosis increased the risk of the discordance between Paco2 and Petco2. Twenty-eight patients who had no hypotension, no metabolic acidosis, and no severe chest trauma showed concordance rate of 100.0% between Paco2 and Petco2. CONCLUSIONS: Severe chest trauma and hemodynamic and tissue perfusion state should be considered when attempting to monitor the hyperventilation in severe brain injury patients using Petco2.

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