What does this research mean for the field?

Postconditioning applied during the first minute of reperfusion significantly reduces myocardial ischemia-reperfusion injury by inhibiting early oxidant generation, but this cardioprotective effect is lost if the intervention is delayed. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine whether brief intermittent ischemia applied during the earliest minutes of reperfusion is critical for postconditioning-mediated cardioprotection.

February 17, 2004Cardiovascular ResearchOpen Access

Postconditioning attenuates myocardial ischemia–reperfusion injury by inhibiting events in the early minutes of reperfusion

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Why the study?

Does postconditioning at the onset of reperfusion reduce infarct size in a rat model of myocardial ischemia-reperfusion?

Population

46 anesthetized open-chest rats subjected to 30 min left coronary artery (LCA) occlusion and 3 h reperfusion

Comparison

Postconditioning vs Control and Sham

Design

Preclinical, randomly divided into six groups

Follow-up

3 hours

Authors

HKHajime KinIwate Medical University

Discussion

Member takes

Implication

Highlights critical reperfusion timing in rat models; leaves open clinical translation of postconditioning.

Key Points

To determine whether brief intermittent ischemia applied during the earliest minutes of reperfusion is critical for postconditioning-mediated cardioprotection.
Anesthetized open-chest rats underwent 30 minutes of left coronary artery occlusion followed by 3 hours of reperfusion.
Rats were randomly divided into six groups: Control, ischemic preconditioning, Post-con 1 (3 cycles of 10 s reflow/re-occlusion in the first minute), Post-con 2 (6 cycles over 2 minutes), delayed postconditioning (initiated after 1 minute of full reflow), and sham (n=8 per intervention group, n=6 for sham; total N=46).
Immediate postconditioning (Post-con 1) reduced myocardial infarct size by 23% compared to control (40 ± 2% vs. 52 ± 3%, p < 0.05) and decreased plasma creatine kinase activity (18 ± 2 vs. 46 ± 6 IU/g protein, p < 0.05), with no additional benefit from 6 cycles (40 ± 2.9%).
Both ischemic preconditioning and Post-con 1 reduced plasma malondialdehyde levels (0.8 ± 0.07 and 0.8 ± 0.06 vs. 1.21 ± 0.08 µM/ml, p < 0.05) and myeloperoxidase activity (1.4 ± 0.3 and 2.5 ± 0.3 vs. 5.5 ± 0.6 U/100 g tissue, p < 0.05) relative to control.
Delayed postconditioning abolished reductions in infarct size, creatine kinase release, and malondialdehyde, while tissue myeloperoxidase activity remained lower than control (3.2 ± 0.4 U/100 g tissue, p < 0.05).

Structured PICO

Does postconditioning at the onset of reperfusion reduce infarct size in a rat model of myocardial ischemia-reperfusion?

Population

46 anesthetized open-chest rats subjected to 30 min left coronary artery (LCA) occlusion and 3 h reperfusion

Intervention

Postconditioning (brief intermittent ischemia applied during the onset of reperfusion, e.g., 3 cycles of 10 s reperfusion followed by 10 s re-occlusion during the first minute)

Comparator

Control (no intervention at reperfusion) and Sham (surgical procedure without LCA ligation)

Outcome

Infarct size measured by TTC stainingsurrogate

Postconditioning applied within the first minute of reperfusion significantly reduces myocardial infarct size and oxidative stress in a rat model of ischemia-reperfusion injury.

Cite This Study

Hajime Kin (2004) studied this question.

synapsesocial.com/papers/6a1e85508a8a69122355fca1 https://doi.org/10.1016/j.cardiores.2004.01.006

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Postconditioning attenuates myocardial ischemia–reperfusion injury by inhibiting events in the early minutes of reperfusion

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Postconditioning attenuates myocardial ischemia–reperfusion injury by inhibiting events in the early minutes of reperfusion

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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