Reoxygenation After Cardiac Arrest II (REOX II Study) (REOX II)

The broad objective of this study is to test the association between hyperoxia exposure after resuscitation from cardiac arrest and outcome. After obtaining written informed consent subjects enrolled in REOX II will undergo a rapid faction of inspired oxygen (FiO2) optimization protocol to prevent exposure to hyperoxia. We will compare outcomes between subjects enrolled in REOX I (observational study only) and REOX II (intervention: rapid FiO2 optimization protocol). Our overarching hypothesis is that exposure to hyperoxia after return of spontaneous circulation (ROSC) is associated with increased oxidative stress and worsened neurological and cognitive outcomes.

Study Overview

• Status: Completed
• Conditions: Cardiac Arrest
• Intervention / Treatment: Other: Protocol for rapid FiO2 optimization

Detailed Description

Specific Aim 1: Test if initiation of the rapid FiO2 optimization protocol following ROSC from cardiac arrest is associated with the degree of in vivo oxidative stress during the post-resuscitation phase of therapy.

Approach: We will conduct a multicenter interventional study (FiO2 optimization protocol) of adult patients resuscitated from cardiac arrest. We will record data pertaining to oxygenation parameters and other factors and measure biomarkers of oxidative stress [isoprostanes (IsoPs) and isofurans (IsoFs)] in the plasma at 0 and 6 hours after ROSC using gas chromatography negative ion chemical ionization mass spectrometry. We will compare plasma IsoPs/IsoFs at each time point between subjects enrolled in REOX II (i.e. receive the study intervention, rapid FiO2 optimization) and REOX I (i.e. do not receive the study intervention) using t-test or Mann-Whitney U as appropriate with corrections for multiple comparisons.

Specific Aim 2: Test if initiation of the rapid FiO2 optimization protocol following ROSC from cardiac arrest is associated with a decrease in neurological disability at hospital discharge.

Approach: In the study described above, we will determine the Modified Rankin Scale (mRS) at hospital discharge. We will compare proportions of good neurological outcome [defined as a mRS ≤ 3] between subjects enrolled in REOX II (i.e. receive the study intervention, rapid FiO2 optimization) vs. those enrolled in REOX I (i.e. do not receive the study intervention), using binomial test.

Specific Aim 3: Test if initiation of the rapid FiO2 optimization protocol following ROSC from cardiac arrest is associated with neuropsychological outcomes among survivors at 180 days.

Approach: In the study described above, we will assess neuropsychological outcome among survivors at 180 days. Neuropsychological testing will use validated instruments across five cognitive domains (attention, Wechsler Adult Intelligence Scale-IV-digit span; (2) reasoning, Wechsler Adult Intelligence Scale-IV-similarities; (3) immediate and delayed memory, Wechsler Memory Scale-III-logical memory I and II; (4) verbal fluency, Controlled Oral Word Association Test; and (5) executive functioning, Hayling Sentence Completion Test). Among survivors, we will compare the 180-day neuropsychological measures (composite z-scores for each cognitive domain) between the same two groups using t-test or Mann-Whitney U as appropriate with corrections for multiple comparisons. We will also compare the proportions of patients able to return to work between the two groups using binomial test

• Study Type: Interventional
• Enrollment (Actual): 16
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Indiana
    • Indianapolis, Indiana, United States, 46202
      • Indiana University/ Methodist Hospital
  • Massachusetts
    • Boston, Massachusetts, United States, 02215
      • Beth Israel Deaconess Medical Center
  • Mississippi
    • Jackson, Mississippi, United States, 39216
      • University of Mississippi Medical Center
  • New Jersey
    • Camden, New Jersey, United States, 08103
      • Cooper University Hospital
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • Hospital of the University of Pennsylvania and Penn Presbyterian Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Age >17 years
• Cardiac arrest
• Return of spontaneous circulation
• Not following commands immediately after ROSC
• Endotracheal intubation
• Clinician intent to treat with therapeutic hypothermia (or absence of clinician intent to withhold therapeutic hypothermia)

Exclusion Criteria:

• Presumed etiology of arrest is trauma
• Presumed etiology of arrest is hemorrhage
• Presumed etiology of arrest is sepsis
• Permanent resident of nursing home or other long-term care facility
• Any other condition, that in the opinion of the investigator, would preclude the subject from being a suitable candidate, e.g. end stage chronic illness with no reasonable expectation of survival to hospital discharge

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Adult patients resuscitated from cardiac arrest; Rapid FiO2 optimization protocol

Other: Protocol for rapid FiO2 optimization; We plan to test a protocol for FiO2 optimization for mechanically ventilated post-cardiac arrest subjects, with a therapeutic goal of partial pressure of arterial oxygen (PaO2) of 60-99 mmHg, based on the PaO2 range that was associated with the lowest risk of poor outcome in our previously published work. We also use PaO2 (measured by arterial blood gas [ABG] analysis) as the ultimate goal rather than arterial oxygen saturation (SaO2) measured by pulse oximetry because an SaO2 value <100% on pulse oximetry monitoring does not always exclude supranormal PaO2. The protocol in this application begins with very rapid reduction of FiO2 as much as possible according to SaO2 values, and when FiO2 is maximally reduced by SaO2 an ABG is measured, followed by finer adjustment of FiO2 to achieve a PaO2 60-99 mmHg. The protocol not only prescribes each downward titration of FiO2 but it also includes detailed limbs for upward titration of FiO2 to account for potential "overshoot" in FiO2 reduction.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Plasma Isofurans (pg/mL)/Isoprostanes (pg/mL) Ratio	Change in the isofurans/isoprostanes ratio between 0 and 6 hours post-ROSC

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Modified Rankin Scale (mRS) (Primary Neurological Outcome)	0: No symptoms at all; No significant disability despite symptoms; able to carry out all usual duties and activities; Slight disability; unable to carry out all previous activities, but able to look after own affairs without assistance; Moderate disability; requiring some help, but able to walk without assistance; Moderately severe disability; unable to walk without assistance and unable to attend to own bodily needs without assistance; Severe disability; bedridden, incontinent and requiring constant nursing care and attention; Dead	Upon hospital discharge, on average two weeks

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Composite Neuropsychological Testing Score	The neuropsychological testing uses validated instruments across five cognitive domains: (1) attention, Wechsler Adult Intelligence Scale-IV-digit span; (2) reasoning, Wechsler Adult Intelligence Scale-IV-similarities; (3) immediate and delayed memory, Wechsler Memory Scale-III-logical memory I and II; (4) verbal fluency, Controlled Oral Word Association Test; and (5) executive functioning, Hayling Sentence Completion Test.	180 days

Collaborators and Investigators

• Sponsor: The Cooper Health System
• Collaborators: National Heart, Lung, and Blood Institute (NHLBI)
• Investigators: Study Director: Stephen Trzeciak, MD, MPH, The Cooper Health System

Study record dates

Study Major Dates

• Study Start: April 1, 2016
• Primary Completion (Actual): October 1, 2018
• Study Completion (Actual): October 1, 2018

Study Registration Dates

• First Submitted: February 25, 2016
• First Submitted That Met QC Criteria: February 29, 2016
• First Posted (Estimate): March 4, 2016

Study Record Updates

• Last Update Posted (Actual): March 29, 2022
• Last Update Submitted That Met QC Criteria: March 7, 2022
• Last Verified: January 1, 2022

More Information

Terms related to this study

• Keywords: Cardiac Arrest, Hyperoxia, Ischemia-reperfusion Injury, Reactive Oxygen Species, Oxidative Stress, Neuropsychological Tests
• Additional Relevant MeSH Terms: Heart Diseases; Cardiovascular Diseases; Heart Arrest
• Other Study ID Numbers: REOX II; R01HL112815 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No