A person has lost his hand at work in a factory and is not able to wear his clothes
**Core Concept**
The person in this scenario is experiencing a condition known as complex regional pain syndrome (CRPS), previously referred to as reflex sympathetic dystrophy syndrome. CRPS is characterized by intense burning pain, swelling, and limited range of motion in the affected limb, following a traumatic injury or surgery.
**Why the Correct Answer is Right**
In CRPS, the sympathetic nervous system is thought to play a significant role, with the release of neurotransmitters such as substance P and calcitonin gene-related peptide (CGRP) contributing to the development of pain and inflammation. The loss of motor function, including the inability to wear clothes, is a common symptom due to the development of contractures and decreased mobility in the affected limb.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the scenario described, as it does not address the symptoms or pathophysiology of CRPS.
**Option B:** While nerve damage may occur in CRPS, it is not the primary cause of the symptoms described, which are more related to the sympathetic nervous system and inflammation.
**Option C:** This option is incorrect as it does not accurately describe the condition or its symptoms.
**Clinical Pearl / High-Yield Fact**
CRPS can be diagnosed based on the presence of four cardinal features: pain, swelling, limited range of motion, and temperature changes in the affected limb. Early recognition and treatment are crucial to prevent the progression of the condition and improve patient outcomes.
**Correct Answer:** B. Nerve damage