Trauma is one of the leading causes of death in patients under 40 years of age. The Advanced Trauma Life Support (ATLS) Guidelines are widely accepted as the standardized approach to trauma and classify hemorrhagic shock according to heart rate (HR), blood pressure (BP), urinary output, and mental status. Paradoxical bradycardia (defined as HR <60 bpm) in hemorrhagic shock is an uncommon presenting feature and presents a diagnostic challenge to the physician; its true incidence is unknown.

A case of paradoxical bradycardia was examined as a presenting feature in hemorrhagic shock.

A 17-year-old male patient presented to our Emergency Department (ED) with collapse and abdominal pain following a collision with another player during a sports match.

The patient was hypotensive (BP 92/42) and bradycardic at triage, with a heart rate of 50. He was pale and diaphoretic with a Glasgow Coma Scale of 13/15, thready pulses, and localized peritonitis in the left upper quadrant of his abdomen.

An increase in blood pressure was observed following initial fluid resuscitation; however, this was transient and preceded the onset of profound hypotension (BP 64/30). Bradycardia with a heart rate between 50-60bpm was persistent despite resuscitative efforts.

Abdominal ultrasound demonstrated intraperitoneal free-fluid, and Computerized Tomography confirmed the presence of a grade V splenic laceration. He was taken to the operating theater for emergency laparotomy and underwent splenectomy. A 2.3 liter hemoperitoneum was found intraoperatively. There were no further complications post-operatively, and he made a full recovery.

Tachycardia is a potentially unreliable marker of blood loss, especially in young, healthy patients. A high index of suspicion is necessary to prevent this uncommon but life-threatening feature of hemorrhagic shock from being overlooked.