You’ve stopped the massive bleeding with a tourniquet. You’ve cleared the airway. You’ve patched the holes in the chest to keep the lungs inflating. In the high-stress world of tactical first aid, it feels like you’ve done the heavy lifting. But the MARCH algorithm isn't finished with you yet. Welcome to Part 4: C - Circulation.

If "M" was about stopping the leak and "R" was about the bellows, "C" is about the pump and the pipes. In a trauma scenario, a casualty can have a clear airway and be breathing fine, but still bleed out internally or slip into fatal shock because their circulatory system is failing. As a Citizen First Responder, your job during the Circulation phase is to ensure the "plumbing" is still working, find the "slow leaks" you might have missed, and treat the silent killer: shock.

Reassessing the "M": Don't Set It and Forget It

The most common mistake people make in a crisis is assuming a problem stays fixed. You applied a tourniquet ten minutes ago, and it looked good then. But what about now?

As you transition into the Circulation phase, the very first thing you must do is reassess your previous interventions. Casualty movement, clothing shifts, or even the body’s own physiological changes can cause a tourniquet to loosen or wound packing to shift.

• Check the Tourniquet: Is it still "high and tight"? Is there any new bright red blood soaking through the proximal side?
• Check the Packing: If you packed a junctional wound (like the groin or armpit), is the pressure dressing still firm?
• Check the Seal: Is that HyFin chest seal you just applied still adhering, or has sweat and blood caused it to slide?

If you find that a previous "fix" is failing, you stop and fix it again. In tactical medicine, we call this "re-evaluating the life-threats." You cannot move forward if the foundation is crumbling.

The "Blood Sweep": Why Clean Gloves Save Lives

Once you’re sure your primary interventions are holding, it’s time to look for what we call "secondary bleeds." These are the wounds that weren't immediately life-threatening but will become a problem if left untreated for the next thirty minutes.

This is where you perform a blood sweep or a finger rake. You are going to systematically run your hands under the casualty’s neck, back, armpits, and legs: everywhere you couldn't see during your initial "M" assessment.

The Common Pitfall: Bloody Hands Lie

Here is a crucial tip we emphasize in our Citizen First Responder course: Never perform a blood sweep with bloody gloves.

If your gloves are already covered in blood from the "M" phase, every time you touch the patient, you’ll see red. You won't know if that's new blood from a fresh wound or old blood from your hands. Before you start your sweep:

1. Change your nitrile gloves if you have spares.
2. If you don't have spares, wipe your hands thoroughly on the casualty’s clean clothing or a rag.
3. Start from the head and work down, checking your palms after every "rake" of a body area.

If you find blood on your clean hands after sweeping the lower back, you know exactly where to start looking for the hole. This systematic approach eliminates the guesswork and keeps you focused under pressure.

Caption: Tactical first aid training focused on circulatory checks and patient assessment (no firearms visible).

Assessing Perfusion: Checking the Pump

In a tactical first aid scenario, you probably won't have a blood pressure cuff or a heart monitor. You have to rely on your senses. We assess "perfusion": how well the blood is actually reaching the tissues: using three primary indicators.

1. The Pulse Check

You are looking for two specific pulses: the Radial (wrist) and the Carotid (neck).

• Radial Pulse: If you can feel a radial pulse, their systolic blood pressure is generally at least 80 mmHg. That’s a good sign.

Carotid Pulse: If you can’t find a pulse at the wrist but you can* find it at the neck, their blood pressure is dangerously low (roughly 60 mmHg). They are in profound shock.

• No Pulse: If there is no carotid pulse and they aren't breathing, you are moving into a different type of protocol.

  2. Capillary Refill

Press down on the casualty’s fingernail or nail bed until it turns white, then let go. In a healthy person, the pink color should return in under two seconds. If it takes longer, the body is shunting blood away from the extremities to protect the core organs. This is a classic red flag for circulatory collapse.

3. Skin Color, Temperature, and Condition (CTC)

The skin tells a story.

• Pale/Cyanotic: If the skin is turning white or blue-ish, they aren't getting enough oxygenated blood.
• Cool/Clammy: "Cold and sweaty" is almost always a sign of shock.
• Flush/Hot: Could indicate heat stroke or infection, but in a trauma context, we are mostly worried about that cold, clammy "death grip" feel.

  Treating for Shock: The Silent Killer

Hemorrhagic shock is what happens when the body's cells don't get enough oxygen because there isn't enough blood left to carry it. By the time you see the classic signs of shock: confusion, rapid breathing, and a weak pulse: the casualty is already in deep trouble.

Treating for shock is one of the most important responsibilities of a Citizen First Responder. It’s not just about "being nice"; it's about preventing the "Lethal Triad" (hypothermia, acidosis, and coagulopathy).

Keep Them Warm

Even on a 90-degree day in Oceanside, NY, a trauma patient can become hypothermic. When you lose blood, you lose the ability to regulate body temperature. If the blood gets too cold, it stops clotting. If it stops clotting, they bleed more. It’s a deadly cycle.

• Get them off the cold ground if possible (use a mat or even extra clothing).
• Cover them with a space blanket, a regular blanket, or your own jacket.
• Wrap their head: you lose a massive amount of heat through the scalp.

  Position for Success

If the injury allows, keep the casualty lying flat on their back (supine). This makes it easier for the heart to pump blood to the brain. However, if they are unconscious or vomiting, remember your "A" and "R" training: keep that airway clear by using the recovery position.

Mental Status

Is the casualty confused? Are they combative or unusually sleepy? A change in mental status is often the first sign that the brain isn't getting enough blood. Talk to them. Keep them calm. Tell them what you are doing. A calm patient has a lower heart rate, which means they bleed slower.

Why "Citizen First Responder" Training Matters

Navigating the complexities of the MARCH assessment can feel like an uphill battle when the adrenaline is pumping. Most people think they can just "wing it" with a basic first aid kit, but tactical medicine requires a different level of discipline. You need to know the difference between a superficial scratch and a circulatory emergency.

At C\&G Solutions, we don't just teach you where the tourniquet goes; we teach you how to manage the entire scene. From the initial "M" to the reassessment of "C," our goal is to give you the skills to act when others freeze. Whether you are a local business owner or a concerned parent, these skills are the clear, reliable path to ensuring the safety of those around you.

Caption: Citizen First Responder training focused on pulse checks, patient assessment, and shock management fundamentals.

Next Steps: Completing the MARCH Assessment

Circulation is the bridge between the immediate life-saving interventions and the long-term stabilization of the patient. Once you’ve secured the "plumbing," you’re ready to move on to Head/Hypothermia, where we address neurological issues and finalize our heat-retention strategies.

If you haven't yet, take a look at our upcoming course schedule. Nothing replaces the value of hands-on training under the guidance of experienced instructors. We provide a judgment-free zone where your confidence can soar, ensuring that if the worst happens, you are ready to lead.

Defend with skill, Act with confidence.*

C&G Solutions is located at Mariners Cove, 3615 Oceanside Road, Oceanside, NY. We specialize in Firearms Training and Safety Education, including our signature Citizen First Responder course.Find this series helpful? Share it with your community: you never know who might need this knowledge tomorrow.