Adenosine for cardioplegic induction: a comparison with St Thomas solution.

Area of Science:

• Cardiology
• Cardiac Surgery
• Cardiothoracic Anesthesia

Background:

• Myocardial preservation is critical during cardiac surgery.
• Potassium crystalloid cardioplegia is a standard method for inducing cardiac arrest.
• Adenosine's role in enhancing cardioplegia requires further investigation.

Purpose of the Study:

• To evaluate the impact of adding adenosine to potassium crystalloid cardioplegia on myocardial preservation and early postoperative cardiac function.
• To compare the efficacy of adenosine-supplemented cardioplegia versus standard cardioplegia in patients undergoing coronary artery bypass surgery.

Main Methods:

• A prospective study involving 60 patients with severe coronary artery disease undergoing coronary artery bypass surgery.
• Patients were divided into two groups: a control group receiving standard St. Thomas cardioplegia and an adenosine group receiving adenosine followed by the same cardioplegia.
• Cardiac standstill time, postoperative cardiac index, filling pressures, pulmonary artery pressure, and creatine phosphokinase (MB) levels were measured.

Main Results:

• The adenosine group achieved significantly faster cardiac standstill (3.4 ± 0.9 seconds) compared to the control group (18.7 ± 3.1 seconds).
• The adenosine group demonstrated improved early postoperative cardiac function, including higher cardiac index and lower filling and pulmonary artery pressures.
• Elevated creatine phosphokinase (MB) levels were significantly lower in the adenosine group (6.6%) compared to the control group (20%).

Conclusions:

• Pre-administration of adenosine with cold crystalloid St. Thomas cardioplegia significantly accelerates cardiac standstill.
• This approach leads to enhanced myocardial preservation and improved early postoperative cardiac function in patients with severe coronary artery disease.
• Adenosine is a valuable adjunct to cardioplegia for optimizing outcomes in cardiac surgery.