The local anesthetic solution should be injected intrathecally at a rate of approximately ...2 ml/s10 ml/s5 ml/s20 ml/s0.2 ml/s

To determine the appropriate injection rate for the local anesthetic solution to be injected intrathecally, we can analyze typical practices and safety guidelines related to intrathecal injections.

1. Break Down the Problem

We need to identify the safe and effective rate at which local anesthetics can be administered intrathecally, given the options provided.

2. Relevant Concepts

Intrathecal injections require careful consideration of the volume and rate of administration to avoid complications such as neurological damage or inadequate anesthesia. Common practice suggests:

• The volume of injection should be relatively small (generally between 1-10 mL) to prevent complications.
• The rate of injection can vary but should ideally be slow to reduce the risk of adverse reactions.

3. Analysis and Detail

Typical injection rates for intrathecal administration usually range from about 0.1 mL/s to 1 mL/s. Rates significantly higher than this can increase the risk for adverse effects and complications.

4. Verify and Summarize

Out of the options provided:

• 2 ml/s: faster than typical practice
• 10 ml/s: excessively fast and unsafe
• 5 ml/s: also considered too fast
• 20 ml/s: dangerously high
• 0.2 ml/s: aligns well with safe practices

Final Answer

The safest and most appropriate injection rate from the options given is 0.2 ml/s.