Blood ammonia and lactate levels on hospital arrival as a predictive biomarker in patients with out-of-hospital cardiac arrest

Koichiro Shinozaki, Shigeto Oda, Tomohito Sadahiro, Masataka Nakamura, Yo Hirayama, Eizo Watanabe, Yoshihisa Tateishi, Kazuya Nakanishi, Nobuya Kitamura, Yasunori Sato, Hiroyuki Hirasawa

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Introduction: No reliable predictor for the prognosis of out-of-hospital cardiac arrest (OHCA) on arrival at hospital has been identified so far. We speculate that ammonia and lactate may predict patient outcome. Methods: This is a prospective observational study. Non-traumatic OHCA patients who gained sustained return of spontaneous circulation and were admitted to acute care unit were included. Blood ammonia and lactate levels were measured on arrival at hospital. The patients were classified into two groups: 'favourable outcome' group (Cerebral Performance Category CPC1-2 at 6-months' follow-up) and 'poor outcome' group (CPC3-5). Basal characteristics obtained from the Utstein template and biomarker levels were compared between these two outcome groups. Independent predictors were selected from all candidates using logistic regression analysis. Results: A total of 98 patients were included. Ammonia and lactate levels in the favourable outcome group (n=10) were significantly lower than those in poor outcome group (n=88) (p<0.05, respectively). On receiver operating characteristic analysis, the optimal cut-off value for predicting favourable outcome was determined as 170μgdl -1 of ammonia and 12.0mmoll -1 of lactate (area under the curve; 0.714 and 0.735, respectively). Logistic regression analysis identified ammonia (≤170μgdl -1 ), therapeutic hypothermia and witnessed by emergency medical service personnel as independent predictors of favourable outcome. When both these biomarker levels were over threshold, positive predictive value (PPV) for poor outcome was calculated as 100%. Conclusions: Blood ammonia and lactate levels on arrival are independent prognostic factors for OHCA. PPV with the combination of these biomarkers predicting poor outcome is high enough to be useful in clinical settings.

Original languageEnglish
Pages (from-to)404-409
Number of pages6
JournalResuscitation
Volume82
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1
Externally publishedYes

Fingerprint

Out-of-Hospital Cardiac Arrest
Ammonia
Lactic Acid
Biomarkers
Logistic Models
Regression Analysis
Induced Hypothermia
Emergency Medical Services
ROC Curve
Area Under Curve
Observational Studies
Prospective Studies

Keywords

  • Ammonia
  • Biomarker
  • Cardiac arrest
  • Cardiopulmonary resuscitation
  • Lactate
  • Outcome

ASJC Scopus subject areas

  • Emergency Medicine
  • Emergency
  • Cardiology and Cardiovascular Medicine

Cite this

Blood ammonia and lactate levels on hospital arrival as a predictive biomarker in patients with out-of-hospital cardiac arrest. / Shinozaki, Koichiro; Oda, Shigeto; Sadahiro, Tomohito; Nakamura, Masataka; Hirayama, Yo; Watanabe, Eizo; Tateishi, Yoshihisa; Nakanishi, Kazuya; Kitamura, Nobuya; Sato, Yasunori; Hirasawa, Hiroyuki.

In: Resuscitation, Vol. 82, No. 4, 01.04.2011, p. 404-409.

Research output: Contribution to journalArticle

Shinozaki, K, Oda, S, Sadahiro, T, Nakamura, M, Hirayama, Y, Watanabe, E, Tateishi, Y, Nakanishi, K, Kitamura, N, Sato, Y & Hirasawa, H 2011, 'Blood ammonia and lactate levels on hospital arrival as a predictive biomarker in patients with out-of-hospital cardiac arrest', Resuscitation, vol. 82, no. 4, pp. 404-409. https://doi.org/10.1016/j.resuscitation.2010.10.026
Shinozaki, Koichiro ; Oda, Shigeto ; Sadahiro, Tomohito ; Nakamura, Masataka ; Hirayama, Yo ; Watanabe, Eizo ; Tateishi, Yoshihisa ; Nakanishi, Kazuya ; Kitamura, Nobuya ; Sato, Yasunori ; Hirasawa, Hiroyuki. / Blood ammonia and lactate levels on hospital arrival as a predictive biomarker in patients with out-of-hospital cardiac arrest. In: Resuscitation. 2011 ; Vol. 82, No. 4. pp. 404-409.
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AU - Nakamura, Masataka

AU - Hirayama, Yo

AU - Watanabe, Eizo

AU - Tateishi, Yoshihisa

AU - Nakanishi, Kazuya

AU - Kitamura, Nobuya

AU - Sato, Yasunori

AU - Hirasawa, Hiroyuki

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