Nerve injury following an intramuscular (IM) injection can manifest with a range of symptoms, primarily involving pain, altered sensation, and motor function deficits.
Symptoms of Nerve Injury After IM Injection
According to research, these are the symptoms:
- Delayed Onset of Pain and Paresthesia: In about 10% of cases, individuals may experience a delayed onset of pain and paresthesia (abnormal sensations like tingling or prickling) minutes to hours after the injection. This occurs because the injection may have been placed adjacent to the nerve or into the epineurium (the sheath surrounding the nerve).
- Progressive Loss of Motor Function: Alongside pain and paresthesia, a progressive loss of motor function can also occur. This means difficulty in moving or controlling muscles in the affected area.
Here's a breakdown in table format:
| Symptom | Description | Onset | Possible Cause |
|---|---|---|---|
| Pain | Discomfort or aching in the area of injection and along the nerve pathway. | Delayed | Needle proximity to or penetration of the nerve. |
| Paresthesia | Tingling, prickling, numbness, or burning sensations. | Delayed | Nerve irritation or compression. |
| Loss of Motor Function | Weakness, difficulty moving a limb, or complete paralysis of affected muscles. | Progressive | Nerve damage affecting motor signals to the muscles. |
Understanding the Symptoms
The appearance of these symptoms suggests potential nerve involvement during the IM injection. Prompt medical evaluation is essential to determine the extent of the injury and initiate appropriate management strategies.
