The current that can cause ventricular fibrillation is within which range?

• A. 0.5-2 mA
• B. 1000-4300 milliamperes
• C. 10-50 mA
• D. 100-200 mA

Answer: (B)

The main idea here is that ventricular fibrillation is caused by a current strong enough to disrupt the heart’s electrical activity as it passes through the chest. When current is in the high-ampere range, especially with alternating current, it can overwhelm the heart’s normal rhythm and trigger a chaotic, life-threatening rhythm like ventricular fibrillation. Currents around 1 to 4.3 amperes (1000–4300 milliamperes) are in the range capable of causing this dangerous effect, which is why that option is the best choice. The smaller ranges listed are generally associated with sensation, muscle contractions, or other less severe responses and do not reliably produce ventricular fibrillation.