Early coronary revascularization improves 24h survival and neurological function after ischemic cardiac arrest. A
Georgios Sideris1, Nikolaos Magkoutis1, Alok Sharma2
1Lariboisiere Hospital, AP-HP-Paris Diderot University, INSERM U942, Paris, France.
Insights
Early reperfusion after cardiac arrest significantly improves survival and neurological outcomes. Prompt restoration of blood flow is crucial, especially in cases of refractory ventricular fibrillation, to achieve return of spontaneous circulation.
Area of Science:
- Cardiovascular Research
- Emergency Medicine
- Translational Science
Background:
- Out-of-hospital cardiac arrest (OHCA) survival rates are critically low.
- Acute coronary obstruction is a primary cause of OHCA.
- Early coronary reperfusion is hypothesized to enhance survival and neurological function.
Purpose of the Study:
- To investigate the impact of early versus late coronary reperfusion on 24-hour survival and neurological outcomes in a porcine model of cardiac arrest.
- To determine the necessity of reperfusion for achieving return of spontaneous circulation (ROSC) in refractory ventricular fibrillation (VF).
Main Methods:
- Induction of LAD occlusion and ventricular fibrillation (VF) in 27 pigs.
- Randomization into early (45min) or late (4h) reperfusion groups post-ROSC.
- Management of refractory VF group with continued CPR and reperfusion at 45min.
- Assessment of 24-hour survival, cerebral performance category (CPC), and cardiac biomarkers.
Main Results:
- Early reperfusion significantly improved 24-hour survival (10/11 vs. 4/10) and neurological function (CPC: 1.4 vs. 2.5) compared to late reperfusion.
- Early reperfusion led to better left ventricular ejection fraction (LVEF) and reduced cardiac biomarkers (troponin I, CK-MB).
- Reperfusion was essential for achieving ROSC in 4 out of 6 animals with refractory VF.
Conclusions:
- Early coronary reperfusion following ischemic cardiac arrest enhances 24-hour survival and neurological recovery.
- Reperfusion is a critical intervention for achieving ROSC in patients experiencing refractory VF.
- These findings support prompt reperfusion strategies in managing cardiac arrest due to acute coronary occlusion.
Background:
Survival after out-of-hospital cardiac arrest (OHCA) remains poor. Acute coronary obstruction is a major cause of OHCA. We hypothesize that early coronary reperfusion will improve 24h-survival and neurological outcomes.
Methods:
Total occlusion of the mid LAD was induced by balloon inflation in 27 pigs. After 5min, VF was induced and left untreated for 8min. If return of spontaneous circulation (ROSC) was achieved within 15min (21/27 animals) of cardiopulmonary resuscitation (CPR), animals were randomized to a total of either 45min (group A) or 4h (group B) of LAD occlusion. Animals without ROSC after 15min of CPR were classified as refractory VF (group C). In those pigs, CPR was continued up to 45min of total LAD occlusion at which point reperfusion was achieved. CPR was continued until ROSC or another 10min of CPR had been performed. Primary endpoints for groups A and B were 24-h survival and cerebral performance category (CPC). Primary endpoint for group C was ROSC before or after reperfusion.
Results:
Early compared to late reperfusion improved survival (10/11 versus 4/10, p=0.02), mean CPC (1.4±0.7 versus 2.5±0.6, p=0.017), LVEF (43±13 versus 32±9%, p=0.01), troponin I (37±28 versus 99±12, p=0.005) and CK-MB (11±4 versus 20.1±5, p=0.031) at 24-h after ROSC. ROSC was achieved in 4/6 animals only after reperfusion in group C.
Conclusions:
Early reperfusion after ischemic cardiac arrest improved 24h survival rate and neurological function. In animals with refractory VF, reperfusion was necessary to achieve ROSC.
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