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Lactic acidosis during closed-chest CPR in dogs.
D L Carden1, G B Martin, R M Nowak
1Department of Emergency Medicine, Henry Ford Hospital, Detroit, Michigan 48202.
Annals of Emergency Medicine
|December 1, 1987
Summary
Conventional closed-chest CPR in dogs led to continuous lactic acid buildup, indicating inadequate tissue oxygenation during cardiac arrest resuscitation. Open-chest CPR, however, showed stable lactate levels post-resuscitation.
Area of Science:
- Cardiovascular Research
- Emergency Medicine
- Animal Models
Background:
- Survival from out-of-hospital cardiac arrest is critically dependent on minimizing downtime.
- Reperfusion strategies may be influenced by the duration of cardiac arrest.
- Previous studies in dogs showed stable peak lactate levels with open-chest resuscitation.
Purpose of the Study:
- To investigate the arterial lactate level changes during conventional closed-chest CPR (CCPR) in dogs.
- To compare lactate dynamics between CCPR and open-chest resuscitation after cardiac arrest.
Main Methods:
- Fourteen dogs underwent 5 minutes of cardiac arrest followed by 30 minutes of CCPR.
- Arterial lactate samples were collected at timed intervals throughout the procedure.
- Resuscitation followed a standardized protocol.
Main Results:
- Mean arterial lactate levels significantly increased throughout the 30 minutes of CCPR (P < .05).
- No significant lactate differences were observed after return of spontaneous circulation (ROSC) in successfully resuscitated dogs.
- In contrast to open-chest CPR, CCPR did not prevent continuous lactate accumulation.
Conclusions:
- CCPR in dogs with cardiac arrest appears to provide inadequate tissue oxygenation and perfusion.
- Continuous lactic acid accumulation during CCPR suggests compromised metabolic status.
- Open-chest resuscitation demonstrated better lactate level stabilization compared to CCPR.