What is the clinical evidence from this study?

Population: Myocardial Ischemia-reperfusion Injury (n=6). Intervention: Left anterior descending artery (LAD) ligation vs. Sham surgery. Primary outcome: Cardiac troponin I (cTnI) levels (p=<0.0001).

What question did this study set out to answer?

This research aims to establish a reliable mouse model for simulating myocardial infarction and understanding its underlying mechanisms.

April 10, 2014Journal of Visualized Experiments

A Murine Model of Myocardial Ischemia-reperfusion Injury through Ligation of the Left Anterior Descending Artery

Q: What are the key findings of this study?

Ligation of the left anterior descending artery followed by reperfusion significantly elevated cardiac troponin I levels compared to sham surgery in a murine model.

Q: What question did this study set out to answer?

This research aims to establish a reliable mouse model for simulating myocardial infarction and understanding its underlying mechanisms.

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Key result

Ligation of the left anterior descending artery followed by reperfusion significantly elevated cardiac troponin I levels compared to sham surgery in a murine model.

Population

Wild type mice

Comparison

Surgical ligation of the left anterior… vs Sham surgery

Design

Preclinical

Follow-up

24 hours

Authors

ZXZhaobin XuChangchun University of Science and Technology JAJenna AlloushUniversity of Maryland, Baltimore EBEric X BeckSUNY Upstate Medical University

Discussion

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Implication

Validates reproducible murine MI models for preclinical testing; leaves open clinical translation pending human studies.

Key Points

This research aims to establish a reliable mouse model for simulating myocardial infarction and understanding its underlying mechanisms.
Surgical ligation of the left anterior descending artery in mice to induce myocardial ischemia
Development of procedures for both short-term ischemia-reperfusion and permanent ligation
Evaluation of ligature placement precision to enhance reproducibility of infarct size
Accurate ligation of the LAD significantly improved reproducibility of myocardial infarction size
This model facilitates more reliable preclinical testing of therapeutic interventions for myocardial damage
Reduction in the number of animals required for statistically valid studies due to improved surgical techniques

Structured PICO

Population

6 mice subjected to a surgical method for inducing myocardial ischemia-reperfusion injury via left anterior descending artery ligation to demonstrate the model's efficacy.

Intervention

Surgical ligation of the left anterior descending artery (LAD) using a modified method to lift the left atrium for accurate placement, inducing 45 minutes of ischemia followed by reperfusion

Comparator

Sham surgery (all surgical procedures performed except tightening of the ligature around the LAD)

Outcome

Cardiac troponin I (cTnI) levels and infarct size (area at risk and infarct area) at 24 hours post-reperfusionsurrogate

Main Result

Absolute Event Rate: 9.195% vs 1.195%

p-value: p=<0.0001

This refined surgical method for LAD ligation in mice improves the reproducibility of infarct size and provides a reliable preclinical model for studying myocardial ischemia-reperfusion injury.

Limitations

Does not provide a perfect simulation of pathology associated with human MI, as mice lack common human co-morbidities like coronary vascular disease, diabetes, and hypertension.
Major surgical incisions into the chest cavity cause tissue disruptions and inflammation that can influence the heart's response.
Requires a high degree of surgical skill due to the small size of the mouse heart.
Surgical tissue disruptions and associated inflammation can influence the response of the heart
Anesthetics and analgesics used for pain management can have cardioprotective effects
Does not perfectly simulate human MI pathology due to lack of co-morbidities like coronary vascular disease, diabetes, and hypertension

Cite This Study

Xu et al. (2014) studied Myocardial Ischemia-reperfusion Injury (n=6). Left anterior descending artery (LAD) ligation vs. Sham surgery was evaluated on Cardiac troponin I (cTnI) levels (p=<0.0001). Ligation of the left anterior descending artery followed by reperfusion significantly elevated cardiac troponin I levels compared to sham surgery in a murine model.

synapsesocial.com/papers/6a278b6a2152eedf3561aca2 https://doi.org/10.3791/51329

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A Murine Model of Myocardial Ischemia-reperfusion Injury through Ligation of the Left Anterior Descending Artery

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Limitations

Cite This Study

A Murine Model of Myocardial Ischemia-reperfusion Injury through Ligation of the Left Anterior Descending Artery

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Limitations

Cite This Study

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