MARCH Protocol Part 1: Massive Hemorrhage and the Science of Arterial Occlusion

Traumatic exsanguination remains the single leading cause of preventable death on the modern battlefield, in tactical law enforcement encounters, and across civilian mass casualty incidents. Within the MARCH algorithm (Massive Hemorrhage, Airway, Respiration, Circulation, Hypothermia/Head), massive hemorrhage occupies the first position not by convention, but by physiological necessity.

1. Clinical Abstract & Hemodynamics: Why "M" Precedes "A"

In conventional civilian resuscitation protocols (such as BLS and ACLS), practitioners are trained to prioritize Airway, Breathing, and Circulation (ABC). While appropriate for medical cardiac arrest, applying the ABC hierarchy to penetrating trauma and blast trauma results in catastrophic mortality. The MARCH framework reorders priorities based on the timeline of preventable death.

The Hemodynamics of Rapid Exsanguination

The average adult human body contains approximately 5.0 liters of circulating blood volume, corresponding to roughly 70 mL per kilogram of body weight. The cardiovascular system depends on a closed, pressurized circuit to maintain Mean Arterial Pressure (MAP) and drive oxygen delivery ($DO_2$) across capillary beds.

When a major high-pressure conduit is breached, such as the common femoral artery (luminal diameter 8–10 mm, resting flow rate 350–500 mL/min, exceeding 1,500 mL/min under adrenergic surge) or the brachial artery, hemodynamic collapse occurs with devastating speed:

• 60 to 90 Seconds: A complete femoral or brachial transection can discharge 1.5 to 2.0 liters of blood, exhausting the body's compensatory reserve.
• 120 Seconds: Uncontrolled arterial hemorrhage drops central venous pressure and cardiac preload to zero, precipitating pulseless electrical activity (PEA) arrest.
• The Airway Contrast: Complete hypoxic brain injury from an occluded airway requires 4 to 6 minutes to cause irreversible cortical death. Arterial exsanguination causes brain death in under 2 minutes. Therefore, stopping the leak must happen first.

Hemorrhagic Shock Progression

The Lethal Triad of Trauma

Rapid hemorrhage initiates a vicious, self-reinforcing pathophysiology known in critical care as the Lethal Triad:

• 1. Hypothermia: Blood carries the body's thermal energy. As circulating volume is lost, core temperature plummets. Human clotting factor enzymes lose approximately 10% of their enzymatic efficiency for every 1°C drop below 37°C. Below 35°C (95°F), standard clotting cascades cease functioning effectively.
• 2. Acidosis: Inadequate cellular perfusion forces tissues to switch from aerobic metabolism to anaerobic glycolysis, producing massive amounts of lactic acid. When serum pH falls below 7.35, thrombin generation is severely impaired. Below pH 7.20, coagulation kinetics collapse regardless of clotting factor levels.
• 3. Coagulopathy: The consumption and dilution of platelets and fibrinogen, compounded by cold and acidosis, destroys the body's ability to form or maintain stable fibrin clots.

2. Anatomical Zones & Occlusion Physics

Field hemorrhage control requires categorizing the wound by anatomical zone. The physical geometry of the injured region dictates which mechanical intervention can achieve arterial occlusion.

The Physics of Arterial Occlusion Pressure (AOP)

Arterial Occlusion Pressure (AOP) is defined as the minimum mechanical pressure required to completely stop arterial blood flow distal to the application point. Achieving AOP is governed by the Law of Laplace:

This physical principle reveals why strap width is critical in device design:

• Narrow Straps (< 1.0 inch): Concentrate force over a tiny surface area. While intuitively this might seem to cut deeper, it actually requires excessive total circumferential tension (> 400 mmHg) to compress deep-seated vessels through muscle mass, risking localized cutaneous necrosis, permanent nerve transection, and band cutting.
• Broad Straps (1.5 to 2.0 inches): Distribute radial compression evenly across soft tissue envelopes. This broad distribution achieves full arterial collapse at substantially lower mechanical pressure thresholds, preserving neurovascular integrity and preventing device slippage under casualty movement.

3. Extremity Hemorrhage Hardware & Application Protocol

For Zone 1 extremity hemorrhage, medical, public safety, and military professionals rely on two complementary categories of equipment: rigid mechanical windlass tourniquets for rapid radial occlusion, and high-modulus elastic wraps for continuous tension, pediatric limbs, and wound packing retention.

Primary Extremity Standard

Combat Application Tourniquet (C-A-T®) Gen 7

Manufactured by North American Rescue, the genuine C-A-T® Gen 7 utilizes a single-routing buckle, 1.5-inch internal band, rigid reinforced windlass rod, and dual-directional clip. It is clinically evaluated based on extensive field experience as the gold standard for rapid extremity arterial occlusion.

$31.99 $34.99 MSRP

View C-A-T® Gen 7 Tourniquet

C-A-T® Gen 7 Application Protocol

1. High & Tight vs. Deliberate Placement: During the active threat or Care Under Fire phase, apply the tourniquet high and tight on the affected limb directly over clothing. In Tactical Field Care, expose the limb, evaluate the exact bleeding site, and position the device 2 to 3 inches proximal to the injury. Never place a tourniquet directly over a joint (knee or elbow).
2. Aggressive Slack Removal: Pull the self-adhering band completely tight before turning the windlass. Slack left in the initial strap routing is the number-one cause of windlass failure and incomplete occlusion.
3. Windlass Rotation to Pulse Cessation: Twist the windlass rod until active arterial bleeding stops and the distal pulse (radial or dorsalis pedis) is completely eliminated.
4. Lock & Secure: Lock the windlass in the clip, route the remaining strap through the bilateral clip horns, and seal the windlass safety strap.
5. Secondary Tourniquet Rule: If active bleeding persists or a distal pulse remains palpable after three windlass turns, immediately apply a second C-A-T Gen 7 directly proximal and touching the first device.
6. Time Documentation: Record the exact application time (e.g., T=1422) on the white writeable safety tab using a permanent marker.

Multi-Mission Elastic Standard

READY WRAP™ (by 6:8 Medical Solutions)

Engineered by 6:8 Medical Solutions, READY WRAP™ is the permanent operational standard across all MED-TAC International loadouts, replacing legacy SWAT-T wraps. It delivers high-modulus medical-grade elastic compression for low-profile EDC carry, pediatric patients, working canine (K-9) trauma, and wound packing retention.

$12.95 Flat EDC Profile

View READY WRAP™ Standard

Clinical Roles for READY WRAP™

• Pediatric Bleeding Control: Toddlers and small children have limb circumferences smaller than the minimum locking threshold of standard adult windlass tourniquets. READY WRAP provides continuous circumferential elastomeric tension on limbs of any diameter.
• Working Dog / K-9 Tactical Medicine: Canine anatomy features tapered muscular limbs that cause rigid windlass bands to slide off. READY WRAP grips fur and contoured anatomy securely.
• Wound Cavity Retention: Once a deep wound is packed with hemostatic gauze, READY WRAP provides sustained, flexible pressure wrapping that does not loosen during casualty extrication.

4. The Junctional Gap & Targeted Mechanical Pressure

Junctional hemorrhage, occurring at the groin (femoral triangle), axilla, and base of the neck, represents a critical vulnerability in prehospital trauma care. Standard extremity tourniquets fail in these regions because there is no distal limb to anchor circumferential strap tension. When applied to junctional wounds, standard bands slip into the wound tract or roll away from the bleeding artery.

Dual-Mode Extremity & Junctional

LST Tourniquet: "The Israeli Tourniquet"

The Life Saving Tourniquet (LST) is a dual-mode device bridging standard limb occlusion and targeted junctional hemorrhage. Featuring a reinforced mechanical base plate and threaded pressure-pin vector mechanism, it provides focused compression over pelvic and clavicular skeletal landmarks.

$34.95 Extremity + Inguinal + Axillary

View LST Dual-Mode Tourniquet

Shaare Zedek Human Clinical Data

Unlike conventional improvised or unverified junctional solutions, the LST Tourniquet's mechanical pressure-pin mechanism was evaluated in rigorous human clinical trials conducted at the Shaare Zedek Medical Center Department of Surgery and Trauma:

• 96.8% Supraclavicular Occlusion Success: Documented complete cessation of distal Doppler pulse in the subclavian/axillary arterial tree by anchoring downward mechanical vector force against the first rib.
• 96.7% Femoral Arterial Occlusion Success: Documented complete occlusion of the common femoral artery at the inguinal ligament by driving the pressure pin directly into the femoral triangle backstopped by the superior pubic ramus.

The LST gives solo rescuers and tactical medics three distinct deployment modes: standard extremity mode, inguinal junctional mode, and clavicular/axillary mode, without carrying bulky multi-pound pneumatic frames.

5. Hemostatic Gauze Mechanisms: Kaolin vs. Chitosan

When hemorrhage occurs in junctional zones or deep muscular wounds where tourniquets cannot be placed, wound packing with procoagulant hemostatic dressings is the primary life-saving intervention. Modern tactical medicine relies on two distinct biochemical mechanisms: inorganic mineral activation (Kaolin) and marine biopolymer aggregation (Chitosan).

QuikClot Combat Gauze®

Active Agent: Kaolin Mineral

Kaolin is an inert, naturally occurring aluminosilicate mineral. Upon blood contact, kaolin activates Factor XII of the intrinsic coagulation cascade, triggering the rapid enzymatic conversion of prothrombin to thrombin. It produces zero heat (non-exothermic) and accelerates natural fibrin polymerization.

$39.99

View QuikClot Combat Gauze

Celox™ Rapid Gauze

Active Agent: High-Density Chitosan

Chitosan is a positively charged marine polysaccharide. It works through electrostatic cross-linking, binding directly to negatively charged red blood cell membranes to form a robust mechanical plug. Celox operates completely independently of the body's clotting factors, functioning in hypothermic and anticoagulated blood.

$37.95

View Celox™ Rapid Gauze

Head-to-Head Comparison: Kaolin vs. Chitosan

6. Advanced Wound Packing & Pressure Wrapping Protocol

Wound packing is not simply stuffing gauze into a hole; it is the deliberate application of internal mechanical tamponade directly against a ruptured arterial wall backstopped by bone. Follow this 4-step clinical protocol:

7. MED-TAC 3-Tier Product Ladder Integration

Medical readiness requires matching equipment loadouts to operational echelon, transit times, and expected casualty counts. MED-TAC International standardizes trauma procurement across three distinct tiers:

8. Clinical Frequently Asked Questions