Question 26

The needle will go completely through the vein.

Inserting the needle at a 45° angle can cause it to penetrate entirely through the vein, leading to a failed venipuncture. This angle increases the risk of the needle exiting the backside of the vein rather than properly entering the lumen.

A) The needle will collapse the vein.

Collapsing the vein typically occurs when negative pressure is applied or if the needle is inserted incorrectly; however, a 45° angle does not inherently lead to this outcome. Therefore, this option is incorrect as it does not accurately describe the consequence of the angle on the vein's integrity.

B) The needle will go completely through the vein.

This option accurately reflects the consequence of inserting the needle at a 45° angle. Such an angle can lead to the needle passing through the vein entirely, which results in a failed venipuncture as the needle fails to access the venous lumen.

C) The needle will miss the vein superficially.

Missing the vein superficially would typically occur if the angle is too shallow or if the needle is not correctly aligned. While a 45° angle could result in a missed puncture, it is more likely that the needle would penetrate through the vein instead, making this option less relevant in this context.

D) The needle will contact the upper wall of the vein.

Contacting the upper wall of the vein could happen if the angle is not optimal; however, at a 45° angle, the more significant risk is that the needle will penetrate too deeply. Thus, this option is not the best explanation for the consequences of using the specified angle during venipuncture.

Conclusion

The correct answer is that the needle will go completely through the vein, as this reflects the primary risk associated with using a 45° insertion angle. The other options do not accurately describe the outcomes of such an angle, highlighting the importance of proper technique in venipuncture to ensure successful access to the vein.