Combined effects of buffer and adrenergic agents on postresuscitation myocardial function

Area of Science:

• Cardiology
• Emergency Medicine
• Pharmacology

Background:

• Alkaline buffer agents alone have not improved resuscitation success.
• The combined effect of buffers and adrenergic agents is thought to improve outcomes.

Purpose of the Study:

• To investigate the effects of buffer agents (CO(2)-consuming and CO(2)-generating) combined with vasopressors on cardiopulmonary resuscitation outcomes.
• To determine the impact of administration sequence on these effects.

Main Methods:

• Ventricular fibrillation was induced in rats.
• Cardiopulmonary resuscitation (CPR) was initiated after 8 minutes.
• Animals received sodium bicarbonate, tromethamine, or saline placebo, followed by epinephrine (vasopressor) or vice versa.
• Coronary perfusion pressure, myocardial function, and survival rates were assessed.

Main Results:

• Both bicarbonate and tromethamine decreased coronary perfusion pressure and reduced vasopressor effectiveness.
• Administering vasopressors before buffers prevented declines in coronary perfusion pressure.
• However, buffer agent treatment impaired postresuscitation myocardial function and decreased survival rates regardless of sequence.

Conclusions:

• The combination of buffer agents with vasopressors does not improve resuscitation outcomes.
• Buffer agents can impair myocardial function and reduce survival post-resuscitation.
• The sequence of administration does not negate the negative effects of buffer agents.