Which suture is "heavier" 4-0 or 10-0 nylon?

The correct answer is that 4-0 nylon is considered "heavier" than 10-0 nylon. This classification is based on the sizing system used for surgical sutures, where the size of the suture is inversely related to its thickness. In surgical terms, a lower number indicates a thicker suture. Therefore, 4-0 nylon is thicker and has a higher tensile strength compared to 10-0 nylon, which is much finer and used in delicate surgeries, such as ophthalmic procedures involving the eye.

Diving deeper, sutures are used in various surgical procedures depending on the tissue type and the required strength for wound closure. Thicker sutures, like 4-0, provide more holding power and are ideal for situations where stronger closure is necessary or where tissue will undergo more stress during healing. On the other hand, finer sutures like 10-0 are preferable when less tissue trauma is desired and high precision is required, especially in delicate areas like the cornea or retina. The choice of a heavier or lighter suture is therefore crucial for the success of the surgery and the healing process.