Table 34-4
- Characteristics of the Local Anesthetic Solution
- Baricity relative to patient position (most important of all factors)
- Local anesthetic dose (little effect with isobaric solutions)
- Local anesthetic concentration
- Volume injected
- Patient Characteristics
- Age, weight, and height (poor predictors of extent of sensory blockade)
- Gender
- Pregnancy
- Technique
- Site of injection
- Speed of injection
- Barbotage
- Direction of needle bevel
- Addition of vasoconstrictors
- Diffusion