Hypovolemic shock, defined as a decrease in circulating blood volume, is the most common type of shock (
1) and a life-threatening condition (
2) if not promptly treated. It is categorized into two forms: Hemorrhagic and non-hemorrhagic shock (
3). Hemorrhagic hypovolemic shock is characterized by an acute reduction in intravascular volume due to bleeding, whereas non-hemorrhagic hypovolemic shock results from a reduction in effective intravascular fluid due to fluid loss from sources such as the gastrointestinal tract, kidneys, skin, or third-space sequestration (
4,
5). Hemorrhagic hypovolemia is the predominant form of shock, with traumatic events being the most frequent cause of hemorrhage (
6). The pathophysiology of hypovolemic shock involves the depletion of intravascular volume (
7). Hemorrhagic shock is classified into four categories based on signs and symptoms:
(1) Class I hemorrhage (less than 15% of total blood volume): In this phase, compensation is adequate to maintain central blood volume and preserve blood flow to vital organs, along with systemic metabolic acidosis and activation of humoral and cellular elements in major under-perfused organs. Signs and symptoms include normal urine output, alert consciousness, a normal respiratory rate, mild increase in pulse rate, relatively cold and pale extremities, and normal blood pressure. Blood and fluid replacement are generally unnecessary.
(2) Class II hemorrhage (15% - 30% of total blood volume loss): Characterized by tachycardia, tachypnea, reduced urine output, an anxious level of consciousness, decreased pulse pressure, cold and sweaty peripheries, and delayed capillary refill. Diastolic blood pressure may rise slightly with minimal changes in systolic pressure. Most cases require stabilization with crystalloid solutions.
(3) Class III hemorrhage (31% - 40% of total blood volume loss): Typically presents with marked tachycardia, tachypnea, a drowsy level of consciousness, reduced urine output, and marked hypotension. Immediate intervention with packed RBCs, blood products, and fluids is necessary to reverse shock.
(4) Severe shock or class IV hemorrhage (more than 40% of blood volume loss): This is an immediate life-threatening event characterized by significant tachycardia, a marked reduction in systolic blood pressure, unmeasurable diastolic blood pressure resulting in narrow pulse pressure, negligible urine output, and a depressed mental state. Patients in this class require rapid transfusion and immediate surgical intervention (
8-
11).
The prognosis of hemorrhagic shock depends on factors like injury severity, time to receive treatment, and injury location (
11). Head injuries are commonly encountered in emergency departments and can vary in presentation, including scalp lacerations, skull fractures, and other forms of intracranial hemorrhage (
12). Although these types of head injuries are unlikely to cause hemorrhagic shock due to the limited space within the skull, scalp lacerations are an exception due to the scalp’s rich blood supply and superficial location. Uncontrolled scalp bleeding may lead to hemorrhagic shock if not properly managed (
13).
There is a correlation between crowded events and trauma with hemorrhage; as crowd density increases, so does the risk of trauma (
14). One of the most significant and crowded events is the 10th of Muharram (Ashura) in Iraq, a day of religious rituals commemorating the martyrdom of Al-Hussain bin Ali (peace be upon him), his family, companions, and near relatives. One ritual, Tatbir, involves creating a superficial laceration on the scalp using a sword or cleaver (
15,
16). Proper management of Tatbir-associated head injuries includes assessing airways, breathing, and circulation, controlling bleeding, and resuscitating with fluids and blood according to hemorrhage classification. Other essential measures include wound sterilization, suturing, and administering anti-tetanus serum and antibiotics.
The Ashura gathering has been growing annually, with increasing numbers participating in Tatbir, which raises health-related issues and the need for logistical planning, including adequately stocked blood banks. This study aims to assess any association between Tatbir-related head injuries and hemorrhagic shock or blood transfusion. To the author’s knowledge, Tatbir-related head injuries have minimal representation in the literature except for one article examining their neurosurgical aspects, which reported two main injury categories: Scalp wounds (84%) and skull fractures (14%). Patients were treated in the emergency department, and a few were admitted, primarily due to skull fractures. Follow-up data is limited (
17).