Question 71

The needle will go completely through the vein.

Inserting the needle at a 45-degree angle can cause it to penetrate the vein entirely, resulting in a failed venipuncture. This angle may lead to improper engagement with the vein, making it difficult to draw blood.

A) The needle will collapse the vein.

While a needle at an inappropriate angle can cause complications, collapsing the vein is more commonly associated with excessive negative pressure or an overly large gauge needle rather than the angle of insertion itself. Therefore, this option does not accurately describe the result of a 45-degree angle insertion.

B) The needle will go completely through the vein.

This option correctly identifies the risk associated with a 45-degree insertion angle. If the needle is inserted too steeply, it can pass through the entire vein, missing the target for blood collection and resulting in a failed venipuncture.

C) The needle will miss the vein superficially.

While it is possible for a needle to miss the vein, this typically occurs when the angle is too shallow or the insertion point is incorrect. A 45-degree angle is generally deep enough to engage the vein rather than merely skim over it, making this option incorrect in this context.

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

Contacting the upper wall of the vein may occur at various angles, including a 45-degree angle; however, it does not inherently indicate a failed venipuncture. The needle may still access the lumen of the vein if the angle is adjusted appropriately thereafter, which does not align with the question's focus on failure.

Conclusion

The correct answer, indicating that the needle will go completely through the vein, highlights the risks associated with improper insertion angles during venipuncture. Other options either misrepresent the outcomes of a 45-degree angle insertion or are not directly related to a failure in drawing blood. Understanding proper techniques is crucial to successful venipuncture practices.