Steroids and Post-resuscitation Infectious (Septic) Complications

Cardiac Arrest Clinical Trial

Official title:

Effect of Stress-dose Steroids on Post-resuscitation Infectious (Septic) Complications After In-hospital Cardiac Arrest. Individual Patient Data-based Re-analysis of Synthesized Prior Randomized Clinical Trial Data

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02408939
• Other study ID #: 14/9/1/2015 IPDRA
• Status: Completed
• Start date: March 2015
• Est. completion date: August 2015

Study information

• Verified date: March 2017
• Source: University of Athens
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Postresuscitation disease is characterized by post-insult systemic inflammation, adrenal insufficiency, and circulatory failure. Such severe pathology may be associated with increased susceptibility to infectious complications and increased risk of death due to postresuscitation septic shock. The latter may be attenuated by stress-dose steroids. In this re-analysis of synthesized randomized clinical trial (RCT) data, the investigators will use individual patient data from two prior RCTs of in-hospital cardiac arrest (NCT00411879 & NCT00729794), in order to determine the effect of stress-dose steroids on the severity of postresuscitation infectious complications, and more specifically, on the risk of septic shock-associated death.

Description:

BACKGROUND AND RATIONALE Patients successfully resuscitated after cardiac arrest experience a "sepsis-like" syndrome characterized by cytokine storm, endotoxemia, coagulopathy, and various degrees of adrenal insufficiency. These pathophysiological mechanisms contribute to the development of circulatory failure, i.e. post-resuscitation shock. Post-resuscitation shock patients resuscitated from vasopressor-requiring cardiac arrest are frequently poorly responsive to high-rate vasopressor infusions (e.g. norepinephrine ≥0.5 μg/kg/min) and intravenous fluids.

The postresuscitation systemic inflammatory response syndrome (SIRS) may be partly caused and subsequently amplified by ischemia/reperfusion (I/R)-associated disruption of the intestinal mucosal barrier. Steroids may suppress key events of I/R injury propagation. Furthermore, in shock states, stress-dose steroids improve vascular responsiveness to vasopressors and preserve monocyte and neutrophil phagocytosis, and dendritic cell function. Low-dose steroids may reduce the mortality of severely ill patients with septic shock.

Nosocomial infections constitute an important cause of postresuscitation mortality. We hypothesized that exposure to stress-dose steroids during and/or after CPR may be associated with reduced risk of death due to postresuscitation infectious complications. To test this hypothesis, we combined data from two prior, prospective studies of in-hospital cardiac arrest. These studies compared the combination of vasopressin, steroids, and epinephrine (VSE) to epinephrine alone, with respect to survival to hospital discharge and good functional outcome. Patients with post-resuscitation shock of the VSE groups received stress dose hydrocortisone (300 mg/day for 7 days maximum, followed by gradual taper at a rate of 100 mg / day and discontinuation on day 10). Patients with post-resuscitation shock of the control groups received saline placebo. Follow-up rates were high in both studies and the reported incidence of post-resuscitation infectious complications was similar in the VSE and control groups.

METHODS Study Design Retrospective analysis of prospectively collected data from two randomized, clinical studies. Study participants were hospitalized in intensive or coronary care units (ICUs or CCUs) of three tertiary care centers: Evaggelismos General Hospital and 401 Greek Army Hospital (both in Athens, Greece), and University Hospital of Larissa, Larissa, Greece.

Ethics and Approval The present analysis is not associated with any clinical intervention, and therefore, the investigators have applied for a waiver of informed consent from either the patient or his/her next of kin. Moreover, the investigators have requested the permission to confirm previously recorded microbiological data through the hospitals' electronic databases The institutional review boards (IRBs) of the aforementioned hospitals have granted their approval for the current study. Evaggelismos Hospital approval No. 14/9/1/2015; 401 Greek Army Hospital approval No. 3/2015/5/2/2015; Larissa University Hospital approval No. 58905/2014/14/1/2015. Modifications of statistical terminology [from individual patient data (IPD) meta-analysis to IPD re-analysis] and of infections' classification in the definition of the primary outcome were also approved by the Evaggelismos IRB (respective Approval Nos. 30/25/2/2016 and 29/25/2/2016) and communicated to the other 2, aforementioned IRBs. These approvals were ratified by the IRBs of the other 2 participating centers (401 Greek Army Hospital, IRB Decision No.: 4-2016/6/4/2016; Larissa University Hospital, IRB Decision No.: 5/19-5-2016/Θ.18). Additional, significant amendments of the analysis protocol aimed at primarily evaluating the effect of stress-dose steroids on lethal septic shock were approved by the Evaggelismos IRB (Approval No. 9/26/1/2017) and appropriately communicated to the other 2, aforementioned IRBs.

Analysis Endpoints are presented in the dedicated subsection. Patients The reference study population consists of 368 patients (Evaggelismos Hospital, n=288/368=78.2%) with in-hospital cardiac arrest, who required epinephrine during cardiopulmonary resuscitation (CPR) according to the 2005 Guidelines for Resuscitation. During CPR, VSE group patients (n=178) also received vasopressin and methylprednisolone and controls (n=190) the respective saline placebos. At 4 hours after CPR, there were 211 surviving patients (VSE group, n=115), who were evaluated for postresuscitation shock. One hundred three VSE group patients were then assigned to stress-dose hydrocortisone and 88 controls to saline placebo. One hundred two VSE group patients and 15 controls were actually treated with stress-dose hydrocortisone (n=117). One VSE group patient did not receive stress dose hydrocortisone due to pharmacist error; however, the patient did receive 40 mg of methylprednisolone during CPR.

Definitions Essential prerequisites for the applicability of the below-provided definitions of infections to determine their (prior) occurence in the participants of the included studies will include the presence of confirmatory investigator recordings (for the prior diagnoses of these infections) and also the retrieval of confirmatory microbiological data from hospital records.

Ventilator-associated pneumonia (VAP) will be defined as new (or worsening if already present) chest x-ray infiltrate and at least 2 of the following 3 findings: worsening of respiratory secretions (to purulent or muco-purulent), leucocytosis or leucopenia (>11000/μL or <4000/μL respectively), and fever or hypothermia (>38 degrees Celcius or <36 degrees Celcius respectively). VAP diagnosis will require at least 48 hours of postresuscitation endotracheal intubation and mechanical ventilation. VAP will be confirmed by a positive tracheobronchial aspirate sample with ≥1000000 Colony Forming Units (CFUs)/μL] and / or a concurrent blood culture positive for the same pathogen.

Ventilator-associated tracheobronchitis (VAT) will be defined as fever (>38 degrees Celcius) not attributable to another infectious complication and positive tracheobronchial aspirate culture (with ≥1000000 CFUs/μL) yielding a new bacteria (not present at intubation), and no radiographic signs of new pneumonia.

Bacteremia (or Fungemia) will be defined as isolation of a pathogen from at least one blood culture set (in cases of coagulase negative Staphylococcus species, or Corynebacterium species, 2 positive blood culture sets will be required). Septic shock will be defined as bacteremia / fungemia plus circulatory failure with at least 30% increase in norepinephrine infusion requirements after day 3 postarrest.

Urinary tract infection will be defined as fever or hypothermia and presence of at least one pathogen in a urine sample culture at a concentration of ≥100000 CFUs/μL.

Post-resuscitation shock, organ / system failures, acute respiratory distress syndrome, hyperglycemia, and survival to hospital discharge with good functional outcome will be defined as in the 2 included VSE studies. Organ failure free days and ventilator free days will be determined as in the 2 included VSE studies.

Statistical Analysis Plan All analyses will be performed with the Statistical Package for Social Sciences version 22.0 (IBM, Armonk, NY, USA). As this is not a randomized study, patient baseline characteristics will be compared between the Steroids and No Steroids groups. Distribution normality will be tested by Kolmogorov-Smirnov test. Dichotomous and categorical variables will be compared by a two-sided chi-square or Fisher's exact test. Continuous variables will be compared by a two-tailed, independent samples t test or Mann-Whitney exact U test.

We will conduct a cumulative incidence competing risks analysis (CICR) to determine cause-specific hazard ratios (CSHRs) and their 95% confidence intervals (CIs) for death due to a postresuscitation infection, i.e., lethal septic shock, death due to a noninfectious cause, and poor inhospital outcome (as defined in the outcome measures subsection).

Prespecified risk factors for physical death or poor inhospital outcome will be group (Intervention vs. Control); cardiac arrest cause (cardiac vs. non-cardiac); cardiac arrest area (monitored vs. non-monitored), initial cardiac arrest rhythm (shockable vs. non-shockable); cardiac arrest time (i.e. weekday vs. holiday and nighttime vs. morning-to-late evening), advanced life support (ALS)-related bicarbonate dose; time from resuscitation team call to ALS initiation plus ALS duration; and therapeutic hypothermia (yes vs. no).

Additional analyses will include addition of early postresuscitation mean arterial pressure as covariate to the multivariable CICR Cox models

Recruitment information / eligibility

• Status: Completed
• Enrollment: 191
• Est. completion date: August 2015
• Est. primary completion date: August 2015
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Adult patients with refractory inhospital cardiac arrest, defined as epinephrine requirement for ventricular fibrillation/tachycardia or asystole/pulseless electrical activity according to guidelines for resuscitation 2005

Exclusion Criteria:

• Age < 18 years

• Terminal illness or do-not resuscitate status

• Cardiac arrest due to exsanguination

• Cardiac arrest before hospital admission

• Pre-arrest treatment with intravenous corticosteroids

• Previous enrollment in or exclusion from the 2 studies included in the re-analysis

Related Conditions & MeSH terms

• Cardiac Arrest
• Heart Arrest
• Infections

Intervention

Drug:
• Stress-dose hydrocortisone
Patients with postresuscitation shock received stress-dose (300 mg) of hydrocortisone for 7 days maximum followed by gradual taper and discontinuation over 48 hours after either the resolution of their hemodynamic instability or day 7 of treatment.

Locations

Country	Name	City	State
France	Service d'anesthésie et des réanimations chirurgicales, ôHôpitaux Universitaires Henri Mondor, Assistance Publique des Hôpitaux de Paris, Université Paris Est, Faculté de Médecine	Créteil
Greece	401 General Military Hospital of Athens	Athens	Attica
Greece	Department of Intensive Care Medicine, Evaggelismos Hospital	Athens	Attica
Greece	President Hellenic Society of Cardiopulmonary Resuscitation	Athens
Greece	University General Hospital of Larissa	Larissa	Thessaly

Sponsors (2)

Lead Sponsor	Collaborator
University of Athens	University of Thessaly

Countries where clinical trial is conducted

France,  Greece, 

References & Publications (24)

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Hekimian G, Baugnon T, Thuong M, Monchi M, Dabbane H, Jaby D, Rhaoui A, Laurent I, Moret G, Fraisse F, Adrie C. Cortisol levels and adrenal reserve after successful cardiac arrest resuscitation. Shock. 2004 Aug;22(2):116-9. doi: 10.1097/01.shk.0000132489.79498.c7. — View Citation

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Kim JJ, Lim YS, Shin JH, Yang HJ, Kim JK, Hyun SY, Rhoo I, Hwang SY, Lee G. Relative adrenal insufficiency after cardiac arrest: impact on postresuscitation disease outcome. Am J Emerg Med. 2006 Oct;24(6):684-8. doi: 10.1016/j.ajem.2006.02.017. — View Citation

Mentzelopoulos SD, Malachias S, Chamos C, Konstantopoulos D, Ntaidou T, Papastylianou A, Kolliantzaki I, Theodoridi M, Ischaki H, Makris D, Zakynthinos E, Zintzaras E, Sourlas S, Aloizos S, Zakynthinos SG. Vasopressin, steroids, and epinephrine and neurol — View Citation

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* Note: There are 24 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Lethal septic shock due to a postresuscitation infection.	Septic shock associated with microbiologically confirmed ventilator-associated pneumonia (VAP), ventilator-associated tracheobronchitis (VAT), central venous catheter-related bloodstream infection, bacteremia/fungemia of presumed extrapulmonary origin, urinary tract infection, and "other" infections (e.g. endocarditis, soft tissue infection, viral infection).	Post-resuscitation length of ICU / CCU stay [60 days].
Secondary	Organ failure-free days	Organ failure-free days: Numbers of days without circulatory, respiratory, renal, hepatic, coagulation, or neurologic failure.	Post-resuscitation length of ICU / CCU stay [60 days].
Secondary	Ventilator-free days	Number of days with sustained spontaneous breathing	Post-resuscitation length of ICU / CCU stay [60 days].
Secondary	Non-infectious complications of stress-dose corticosteroid treatment	Hyperglycemia, peptic ulcer bleeding, and neuromuscular weakness	Post-resuscitation length of ICU / CCU stay [60 days].
Secondary	Death due to noninfectious causes	Death of any cause besides a postresuscitation infectious complicaiton	Post-resuscitation length of ICU / CCU stay [60 days].
Secondary	Poor inhospital outcome	Physical death during patient follow-up or postresuscitation neurologic failure [i.e. Glasgow Coma Score (GCS) =9 while being circulatory failure-free and =24 h sedation-free] that was associated with a Cerebral Performance Category score of =3 at the end of the follow-up.	Post-resuscitation length of ICU / CCU stay [60 days].