Effects of ω-3 PUFA and ascorbic acid combination on post-resuscitation myocardial function.

Area of Science:

• Cardiovascular Research
• Emergency Medicine
• Biochemistry

Background:

• Cardiac arrest (CA) and subsequent cardiopulmonary resuscitation (CPR) often lead to myocardial dysfunction and organ damage.
• Administration of ω-3 polyunsaturated fatty acid (ω-3 PUFA) or ascorbic acid (AA) has shown promise in improving outcomes after CA.
• The combined effects of ω-3 PUFA and AA on myocardial function and microcirculation following CA/CPR are not well understood.

Purpose of the Study:

• To investigate the effects of ω-3 PUFA combined with AA on myocardial function after CA and CPR in a rat model.
• To evaluate the impact of these treatments on sublingual microcirculation, lipid peroxidation, and systemic inflammation.

Main Methods:

• Thirty male rats were randomized into five groups: sham, control, ω-3 PUFA, AA, and ω-3 PUFA + AA.
• Ventricular fibrillation was induced, followed by 8 minutes of CPR, with drug or vehicle infusion at the start of CPR.
• Myocardial function, sublingual microcirculation, and biochemical markers were assessed after return of spontaneous circulation (ROSC).

Main Results:

• Both ω-3 PUFA and AA significantly improved myocardial function and sublingual microcirculation compared to the control group post-ROSC.
• The combination of ω-3 PUFA + AA demonstrated superior improvement in myocardial function compared to either agent alone.
• ω-3 PUFA or AA reduced pro-inflammatory cytokines, cardiac troponin I (cTnI), and markers of lipid peroxidation (MDA, 4-HNE). The combination therapy showed a greater reduction in MDA and 4-HNE.

Conclusions:

• ω-3 PUFA and AA treatment mitigate post-resuscitation myocardial dysfunction, enhance microcirculation, and reduce oxidative stress and inflammation.
• Combined ω-3 PUFA and AA administration provides an additive benefit in suppressing lipid peroxidation and improving myocardial recovery.
• This combination therapy represents a promising strategy for improving outcomes following cardiac arrest and resuscitation.