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Transient reperfusion with acidic solution affects postischemic functional recovery: studies in the isolated working
T Ohashi1, F Yamamoto, H Yamamoto
1Department of Cardiovascular Surgery, National Cardiovascular Center, Osaka, Japan.
The Journal of Thoracic and Cardiovascular Surgery
|March 1, 1996
Summary
Mildly acidic reperfusate (pH 6.8) improved myocardial protection in working rat hearts. Short reperfusion durations (under 3 minutes) were optimal, as longer exposure exacerbated injury.
Area of Science:
- Cardiology
- Physiology
- Biochemistry
Background:
- Myocardial protection during cardiac surgery is critical.
- Reperfusion injury can occur after ischemia.
- Optimizing reperfusate composition and duration is key for cardiac recovery.
Purpose of the Study:
- To investigate the impact of reperfusate acidity and duration on myocardial protection.
- To determine the optimal pH and time for reperfusion in an isolated working rat heart model.
Main Methods:
- Isolated working rat heart model subjected to global ischemia.
- Reperfusion with varying pH levels (5.6, 6.8, 7.5) of Krebs-Henseleit buffer.
- Assessment of myocardial recovery based on different reperfusion durations (0.5 to 15 minutes).
Main Results:
- Reperfusion with a pH of 6.8 demonstrated superior recovery compared to pH 5.8 or 7.5.
- Optimal recovery was observed with reperfusion durations less than 3 minutes at pH 6.8.
- Prolonged reperfusion (>3 minutes) at pH 6.8 led to increased reperfusion injury.
Conclusions:
- Reperfusate acidity and duration significantly influence myocardial protection.
- A mildly acidic reperfusate (pH 6.8) for a short duration (<3 minutes) offers optimal myocardial recovery.
- The study highlights a biphasic response to acidic reperfusion, emphasizing the importance of precise control over both pH and duration.