Cardiopulmonary resuscitation in the mouse

Area of Science:

• Cardiology
• Physiology
• Animal Models

Background:

• Developing reliable animal models for cardiac arrest and resuscitation is essential for advancing research.
• Previous models in rats exist, but a murine model comparable to larger mammals is needed for fundamental investigations.

Purpose of the Study:

• To adapt a rat model of cardiopulmonary resuscitation for use in mice.
• To establish a murine model of cardiac arrest and resuscitation for in-depth research.

Main Methods:

• Anesthetized, mechanically ventilated mice underwent tracheal intubation and microcapnometry for end-tidal PCO2 (PETCO2) measurement.
• Aortic and right atrial catheters were inserted to compute coronary perfusion pressure (CPP).
• Ventricular fibrillation was induced via endocardial electrical stimulation, followed by chest compressions after 4 minutes.

Main Results:

• Ten studies were conducted, with five successful resuscitations and five failures.
• Successful resuscitation was linked to achieving threshold levels of CPP and PETCO2 during chest compressions.
• Thresholds for mean aortic pressure, CPP, and PETCO2 were critical determinants of resuscitability, consistent with findings in rats, swine, and humans.

Conclusions:

• A reproducible murine model for cardiac arrest and resuscitation has been established.
• This model allows for fundamental investigations into cardiopulmonary arrest and resuscitation mechanisms.
• Key physiological parameters like CPP and PETCO2 are critical for successful resuscitation in this mouse model.