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Vasopressors During Cardiopulmonary Resuscitation. a Network Meta-Analysis of Randomized Trials

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Vasopressors During Cardiopulmonary Resuscitation. a Network Meta-Analysis of Randomized Trials Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2018 Vasopressors During Cardiopulmonary Resuscitation. A Network Meta-Analysis of Randomized Trials Belletti, Alessandro ; Benedetto, Umberto ; Putzu, Alessandro ; Martino, Enrico A ; Biondi-Zoccai, Giuseppe ; Angelini, Gianni D ; Zangrillo, Alberto ; Landoni, Giovanni Abstract: OBJECTIVES Several randomized controlled trials have compared adrenaline (epinephrine) with alternative therapies in patients with cardiac arrest with conflicting results. Recent observational studies suggest that adrenaline might increase return of spontaneous circulation but worsen neurologic outcome. We systematically compared all the vasopressors tested in randomized controlled trials in adult cardiac arrest patients in order to identify the treatment associated with the highest rate of return of spontaneous circulation, survival, and good neurologic outcome. DESIGN Network meta-analysis. PATIENTS Adult patients undergoing cardiopulmonary resuscitation. INTERVENTIONS PubMed, Embase, BioMed Central, and the Cochrane Central register were searched (up to April 1, 2017). We included all the randomized controlled trials comparing a vasopressor with any other therapy. A network meta-analysis with a frequentist approach was performed to identify the treatment associated with the highest likelihood of survival. MEASUREMENTS AND MAIN RESULTS Twenty-eight studies random- izing 14,848 patients in 12 treatment groups were included. Only a combined treatment with adrenaline, vasopressin, and methylprednisolone was associated with increased likelihood of return of spontaneous circulation and survival with a good neurologic outcome compared with several other comparators, in- cluding adrenaline. Adrenaline alone was not associated with any significant difference in mortality and good neurologic outcome compared with any other comparator. CONCLUSIONS In randomized controlled trials assessing vasopressors in adults with cardiac arrest, only a combination of adrenaline, vasopressin, and methylprednisolone was associated with improved survival with a good neurologic out- come compared with any other drug or placebo, particularly in in-hospital cardiac arrest. There was no significant randomized evidence to support neither discourage the use of adrenaline during cardiac arrest. DOI: https://doi.org/10.1097/CCM.0000000000003049 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-162689 Journal Article Published Version Originally published at: Belletti, Alessandro; Benedetto, Umberto; Putzu, Alessandro; Martino, Enrico A; Biondi-Zoccai, Giuseppe; Angelini, Gianni D; Zangrillo, Alberto; Landoni, Giovanni (2018). Vasopressors During Cardiopulmonary Resuscitation. A Network Meta-Analysis of Randomized Trials. Critical Care Medicine, 46(5):e443-e451. DOI: https://doi.org/10.1097/CCM.0000000000003049 Online Review Articles Vasopressors During Cardiopulmonary Resuscitation. A Network Meta-Analysis of Randomized Trials Alessandro Belletti, MD1; Umberto Benedetto, MD, PhD2; Alessandro Putzu, MD3; Enrico A. Martino, MD1; Giuseppe Biondi-Zoccai, MD, MSc4,5; Gianni D. Angelini, MD2; Alberto Zangrillo, MD1,6; Giovanni Landoni, MD1,6 Objectives: Several randomized controlled trials have compared Measurements and Main Results: Twenty-eight studies randomizing adrenaline (epinephrine) with alternative therapies in patients with 14,848 patients in 12 treatment groups were included. Only a com- cardiac arrest with conflicting results. Recent observational stud- bined treatment with adrenaline, vasopressin, and methylprednisolone ies suggest that adrenaline might increase return of spontaneous was associated with increased likelihood of return of spontaneous cir- circulation but worsen neurologic outcome. We systematically culation and survival with a good neurologic outcome compared with compared all the vasopressors tested in randomized controlled several other comparators, including adrenaline. Adrenaline alone was trials in adult cardiac arrest patients in order to identify the treat- not associated with any significant difference in mortality and good ment associated with the highest rate of return of spontaneous neurologic outcome compared with any other comparator. circulation, survival, and good neurologic outcome. Conclusions: In randomized controlled trials assessing vasopressors in Design: Network meta-analysis. adults with cardiac arrest, only a combination of adrenaline, vasopres- Patients: Adult patients undergoing cardiopulmonary resuscitation. sin, and methylprednisolone was associated with improved survival Interventions: PubMed, Embase, BioMed Central, and the with a good neurologic outcome compared with any other drug or pla- Cochrane Central register were searched (up to April 1, 2017). cebo, particularly in in-hospital cardiac arrest. There was no significant We included all the randomized controlled trials comparing a randomized evidence to support neither discourage the use of adrena- vasopressor with any other therapy. A network meta-analysis with line during cardiac arrest. (Crit Care Med 2018; 46:e443–e451) a frequentist approach was performed to identify the treatment Key Words: adrenaline; cardiac arrest; resuscitation; return of associated with the highest likelihood of survival. spontaneous circulation; survival; vasopressin 1Department of Anesthesia and Intensive Care, IRCCS San Raffaele ardiac arrest is the most severe medical emergency; Scientific Institute, Milan, Italy. despite wide efforts to improve outcome, only a minor- 2University of Bristol, School of Clinical Sciences, Bristol Heart Institute, ity of resuscitated patients is discharged in good neuro- Bristol, United Kingdom. C logic condition. 3Department of Cardiovascular Anesthesia and Intensive Care, Fondazi- Out-of-hospital cardiac arrest (OHCA) has an estimated one Cardiocentro Ticino, Lugano, Switzerland. occurrence rate of 55–113 cases yearly per 100,000 inhabit- 4Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Latina, Italy. ants with crude survival rates ranging from 6% to 22% (1–5). 5Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy. In-hospital cardiac arrest (IHCA) has a reported occurrence 6Vita-Salute San Raffaele University, Milan, Italy. rate of one to five cases every 1,000 patients (6–8), with sur- Drs. Belletti and Benedetto equally contributed to the article. vival rates of approximately 24% (9). Supplemental digital content is available for this article. Direct URL citations Current guidelines on cardiopulmonary resuscitation appear in the printed text and are provided in the HTML and PDF versions (CPR) and advanced life support (ALS) recommend the of this article on the journal’s website (http://journals.lww.com/ccmjournal). administration of 1 mg of adrenaline (epinephrine) via IV or Drs. Benedetto and Angelini have been supported by The National Insti- intraosseous route every 3–5 minutes during resuscitation; tute for Health Research Bristol Biomedical Research Centre. however, this recommendation is based on expert opinion, and The authors have disclosed that they do not have any potential conflicts of interest. there is no direct evidence that adrenaline increases survival to For information regarding this article, E-mail: [email protected] hospital discharge (10). In addition, recent observational stud- Copyright © 2018 by the Society of Critical Care Medicine and Wolters ies suggest that administration of adrenaline may increase the Kluwer Health, Inc. All Rights Reserved. rate of return of spontaneous circulation (ROSC) but at the DOI: 10.1097/CCM.0000000000003049 cost of a worse neurologic outcome in survivors (11). Critical Care Medicine www.ccmjournal.org e443 Copyright © 2018 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved. Belletti et al Several randomized controlled trials (RCTs) have compared high-dose adrenaline was greater than or equal to 2 mg or standard adrenaline with higher doses of adrenaline, alternative 0.1 mg/kg. This definition is consistent with results of animal vasopressors (e.g., vasopressin), combinations of vasopressors, trials performed in the late 80s and early 90s suggesting that or placebo (12–17), with conflicting results. However, results adrenaline doses higher than 1 mg might results in improved of these trials have not been compared with each other in order outcome (35–40). Two independent investigators assessed the to detect which pharmacologic strategy is the best (18). internal validity and risk of bias (at a study level) of included A network meta-analysis (NMA) is a statistical technique trials according to the “Risk of bias assessment tool” devel- that allows performing an indirect comparison between treat- oped by The Cochrane collaboration (41), with divergences ments that have never been directly compared in randomized resolved by consensus. clinical trials (19–21). Therefore, we performed a NMA to indirectly compare and Data Synthesis and Analysis grade all the vasopressor drugs tested in RCTs in adult patients Primary outcome was survival at the longest follow-up avail- with cardiac arrest in order to identify the treatment associated able, whereas secondary outcomes were ROSC rate and sur- with the highest survival rate, the highest likelihood of ROSC, vival with a good neurologic outcome at the longest follow-up and the best
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