TCRN Practice Exam 2025 – Complete Prep for Your Test

Question: 1 / 400

Which of the following does not affect the efficacy of a neurolytic block?

Concentration of the neurolytic agent

Nerve type

Nerve thickness

Needle size

The efficacy of a neurolytic block refers to how effectively the block prevents nerve conduction and thereby alleviates pain. Among the provided options, the size of the needle used for the procedure does not significantly influence this efficacy.

Neurolytic agents, such as phenol or alcohol, work through specific chemical properties and their interactions with nerve tissues, which are essential for blocking signals. The concentration of the neurolytic agent is crucial as it determines the potency of the block; higher concentrations typically lead to more significant and longer-lasting effects. Similarly, the type of nerve being targeted can affect the outcome because different nerves have varying tolerances and responses to neurolytic agents. Nerve thickness also plays a role in how well the agent penetrates and affects the nerve, with thicker nerves possibly requiring more vigorous intervention for effective block.

In contrast, the size of the needle is more related to the practical aspects of delivering the agent, such as ease of access to the target site or minimizing discomfort during the procedure. While a larger or smaller needle may influence things like the injection technique or the patient's experience, it does not directly alter the chemical efficacy of the neurolytic agent itself on the nerve. Thus, it stands out as the factor that does

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