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Which is more painful, IV or IM?

Published in Injection Pain 2 mins read

Based on the provided reference, IM (intramuscular) injections were reported as more painful than IV (intravenous) injections by a higher number of patients.

Comparing Pain Levels of Injections

A study involving 41 patients showed varying pain experiences with different types of injections. The key findings are summarized below:

Injection Type Number of Patients Reporting as Most Painful Percentage of Patients
IM Injection 23 50%
IV Injection 18 39%
Spinal Injection 5 11%

Analysis

  • IM Injection: 23 out of 41 patients (50%) found IM injections to be the most painful. This shows a significant proportion of patients experiencing more pain with this method.

  • IV Injection: 18 out of 41 patients (39%) reported IV injections as their most painful experience. While also a substantial number, it is less than those who found IM injections more painful.

  • Spinal Injection: Only 5 patients (11%) found spinal injections to be the most painful, with multiple attempts contributing to increased pain.

Why Might IM Injections Be More Painful?

Several factors can contribute to the perception of increased pain with IM injections:

  • Muscle Tissue: IM injections are delivered into muscle tissue, which has more nerve endings compared to veins. This can result in higher levels of pain sensations.
  • Volume of Medication: IM injections often involve larger volumes of medication compared to IV injections, which can further contribute to discomfort.
  • Injection Technique: Factors like the angle and speed of injection, as well as the needle gauge, can influence the level of pain experienced.

Practical Insights

  • Patient Variability: It's crucial to note that pain perception is subjective and can vary greatly from person to person.
  • Communication: Open communication between patients and healthcare providers regarding concerns about injection-related pain is essential.
  • Pain Management: Healthcare professionals should employ strategies to minimize pain during injections, such as using the smallest needle possible, applying topical anesthetic, and distracting the patient.

Conclusion

Although both IV and IM injections can cause pain, the study indicates that a higher percentage of patients reported IM injections as more painful than IV injections.

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