When using bipolar energy for hemostasis, which description is accurate?

• A. Small vessels, dry field, high energy
• B. Larger vessels, works in wet field, less lateral thermal spread, lower energy requirement
• C. Bipolar energy is never used in laparoscopy
• D. Bipolar energy causes more lateral thermal spread than monopolar

Answer: (B)

Bipolar energy works by delivering current between two closely spaced tips on the instrument, so the tissue between and immediately around the jaws is the only path for the current. That creates a concentrated, localized effect with less heat spreading to surrounding tissue. Because the energy stays confined to the tissue between the tips, it can be used reliably in a wet field and does not depend on a distant return pad, which makes it safer in laparoscopic settings where fluids are present.

This setup also supports sealing larger vessels more effectively than monopolar energy, while using lower overall energy to achieve coagulation. The result is less lateral thermal spread than with monopolar energy, which explains why this description—larger vessels, works in a wet field, less lateral thermal spread, and lower energy requirement—is the most accurate.

The other statements don’t fit as well: bipolar devices are not limited to dry-field or small-vessel use, they are indeed used in laparoscopy, and they typically cause less, not more, lateral thermal spread compared with monopolar energy.