What does Kehr's sign indicate?

Kehr's sign is specifically recognized as referred pain to the shoulder, typically associated with splenic or liver trauma. This phenomenon occurs due to the irritation of the diaphragm, which shares an innervation pathway with the shoulder area, particularly the C3-C5 spinal nerves. When the spleen is damaged or there is blood in the peritoneal cavity (often following splenic rupture), this irritation can signal pain that manifests in the shoulder region, particularly on the left side.

This clinical sign is important in emergency medicine as it helps healthcare providers identify possible internal injuries that can lead to significant complications, guiding further assessments and interventions. Understanding Kehr's sign is crucial for paramedics, as it aids in the recognition of life-threatening conditions that demand prompt medical attention.