Hypothermia After Cardiac Arrest - Effects on Myocardial Function and Inflammatory Response.
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 26
- 试验地点
- 2
- 主要终点
- Plasma concentration of inflammatory markers
研究概览
简要总结
The on-going randomized clinical trial TTM2 (Target Hypothermia Versus Targeted Normothermia After Out-of-hospital Cardiac Arrest, NCT02908308) investigates if there is a difference in mortality, neurological function or quality of life in comatose survivors after out-of-hospital cardiac arrest if treated (Group A) at target temperature of 33 oC or (Group B) by avoiding fever during the first 24 h.
In this sub study, the effect of different target temperatures on cardiac and circulatory physiology is evaluated by echocardiography and pulmonary artery catheter. Tissue damage after cardiac arrest in part is caused by an activation of different parts of the inflammatory system (reperfusion injury). This study investigates the effect of temperature management on inflammation and the link to the circulatory effects.
详细描述
Hypothermia (HT) is used as an adjunctive treatment to improve outcome in comatose survivors of out-of-hospital cardiac arrest (OHCA). Optimal temperature is debated and in the TTM-trial (Target Temperature Management study), which randomized to management at either 33 degrees C or 36 degrees C for 24h after return of spontaneous circulation (ROSC), no difference in mortality or neurological outcome was shown. The TTM-2-trial (Target Hypothermia Versus Targeted Normothermia After Out-of-hospital Cardiac Arrest, NCT02908308) was initiated to investigate if there is a difference in mortality, neurological function or quality of life between target temperature of 33 degrees C or avoiding fever in comatose patients after out-of-hospital cardiac arrest and meet some of the critique that was raised against the TTM-trial regarding the speed of induction of hypothermia, that both groups were treated at different degrees of hypothermia and that both groups could have benefitted from this intervention.
This study is a prospective sub-study to the TTM-2 trial investigating the cardiac and hemodynamic effects of different target temperatures using echocardiography and pulmonary artery catheter (PAC). Data will be harvested and echocardiographic registration will be made during the target temperature phase, upon rewarming and after 48-72 hours. There will be a follow-up echocardiographic examination at 6 months from randomization.
Ischemia/reperfusion (I/R) injury is a key challenge in myocardial infarction and cardiac arrest. In this study most patients will experience myocardial infarction affecting the heart only, while all patients will experience cardiac arrest affecting the whole body. A major determinant of long-term outcome is the degree of cell death due to stop of blood supply during ischemia and aggravation of organ damage during reperfusion caused by innate immune activation. In this study we will address the importance of the innate immune system in determining outcome and the interplay and dependency with cardiac function.
Blood samples will be collected at the same time points as echocardiography registrations and collection of hemodynamic data and analyzed post study cessation.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Triple (Participant, Investigator, Outcomes Assessor)
盲法说明
The clinical team responsible for the participant (physicians, nurses and others) and involved with direct patient care will not be blinded to allocation group due to the inherent difficulty in blinding the intervention and as temperature is a vital sign required for clinical care. Measures will be taken to ensure that the information about allocation will not disseminate beyond the immediate group of caregivers responsible for patient care. A blinded physician will evaluate the patient for Cardiac function at pre-specified time-Points after randomisation and make a statement on Cardiac function.
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Included in the TTM2-trial and treated at the Intensive Care Unit at Rikshospitalet, Oslo
- •Out-of-hospital cardiac arrest of a presumed cardiac or unknown cause
- •Sustained ROSC - defined as 20 minutes with signs of circulation without the need for chest compressions.
- •Unconsciousness defined as not being able to obey verbal commands (FOUR-score motor response of <4) and no verbal response to pain after sustained ROSC.
- •Eligible for intensive care without restrictions or limitations
- •Inclusion within 180 minutes of ROSC
排除标准
- •Not included in the TTM2-trial
- •Unwitnessed cardiac arrest with an initial rhythm of asystole
- •Temperature on admission <30°C.
- •On ECMO prior to ROSC
- •Obvious or suspected pregnancy
- •Intracranial bleeding
- •Severe chronic obstructive pulmonary disorder (COPD) with long-term home oxygen therapy"
结局指标
主要结局
Plasma concentration of inflammatory markers
时间窗: 48 hours , 72 hours, 6 months
inflammatory markers to be specified (e.g. Complement system activation, pro-inflammatory cytokines like IL-6 expressed as nanogram/milliliter)
Change in wall motion score
时间窗: 48 hours , 72 hours, 6 months
Cardiac output
次要结局
- Association between inflammatory response and cardiac function(48 hours , 72 hours, 6 months)
研究者
Søren Erik Pischke
Principal Investigator, MD, PhD. Senior consultant
Oslo University Hospital