Local Anaesthetic Risks: Cardiac Arrest Causes

The local anaesthetic that poses a significant risk of irreversible cardiac arrest upon intravenous administration is Bupivacaine.

Bupivacaine Cardiotoxicity Explained

• High Cardiotoxicity: Bupivacaine is particularly associated with severe cardiotoxicity.
• Mechanism: It binds strongly and dissociates slowly from cardiac sodium channels. This prolonged blockade leads to rapid onset of life-threatening ventricular arrhythmias, such as ventricular tachycardia and fibrillation.
• Intravenous Risk: Accidental intravenous injection or rapid systemic absorption dramatically increases the risk of cardiac arrest. The effects are often profound and difficult to manage.
• Comparison: While other local anaesthetics like Lignocaine and Prilocaine can also cause toxicity, Bupivacaine is notorious for causing sudden, irreversible cardiac arrest due to its specific electrophysiological effects. Cocaine has stimulant and vasospastic effects, but Bupivacaine's risk profile for IV-induced cardiac arrest is distinct.

Therefore, careful administration and vigilance against accidental IV injection are crucial when using Bupivacaine.