MED-TAC International's circulatory support collection includes blood pressure monitors, stethoscopes, pulse oximeters, IV supplies, and circulation assessment tools for tactical medics, EMS, combat lifesavers, and prehospital providers. These are the essential instruments for evaluating and managing circulatory status — the "C" in MARCH — during field care, transport, and prolonged scenarios. Clinician-founded and SDVOSB-certified, Pembroke Pines, FL.
What Is Circulatory Assessment in Tactical and Prehospital Medicine?
In the MARCH algorithm, Circulation refers to the assessment and management of shock beyond hemorrhage control — evaluating pulse quality, blood pressure, skin perfusion, and capillary refill to detect hemorrhagic shock, tension pneumothorax decompensation, and obstructive shock. The Joint Trauma System Clinical Practice Guidelines for Shock define Tactical Field Care goals including a target systolic BP of 80–90 mmHg for patients with TBI, and 80–100 mmHg for isolated hemorrhagic shock — making blood pressure measurement a critical field skill. Pulse oximetry monitors SpO2 as a proxy for oxygenation and perfusion adequacy, particularly during respiratory compromise or high-altitude operations.
What Circulatory Monitoring Equipment Should a Tactical Medic Carry?
A complete circulatory assessment kit should include: a manual sphygmomanometer with stethoscope for blood pressure measurement, a pulse oximeter (finger clip or wrap-style) for continuous SpO2 monitoring, and a tourniquet time marker for tracking ischemia duration. For prolonged field care lasting more than one hour, an IV start kit enables fluid resuscitation in patients with hemorrhagic shock unresponsive to hemorrhage control alone. Whole blood or blood products are increasingly available to advanced tactical practitioners, making IV/IO access skills and supplies critical. Explore IV and infusion supplies in our IV/IO Blood Transfusion collection.
| Device |
What It Measures |
Clinical Application |
Provider Level |
| Blood Pressure Cuff |
Systolic/diastolic BP |
Shock classification, fluid resuscitation guidance |
CLS, 18D, Paramedic, EMT |
| Stethoscope |
Heart/breath sounds, BP auscultation |
Hemorrhagic shock, tension pneumothorax confirmation |
EMT, Paramedic, PA, MD |
| Pulse Oximeter |
SpO2, pulse rate |
Oxygenation monitoring, shock index assessment |
CLS and above |
| IV Start Kit |
Vascular access |
Fluid resuscitation, medication delivery |
Advanced EMT, Paramedic, 18D |
How Is Hemorrhagic Shock Classified in the Field?
The Advanced Trauma Life Support (ATLS) classification system defines four classes of hemorrhagic shock based on estimated blood loss, heart rate, blood pressure, respiratory rate, and mental status. Class I (up to 750 mL loss) shows no significant vital sign changes. Class II (750–1500 mL) presents with increased heart rate and narrowing pulse pressure. Class III (1500–2000 mL) shows marked tachycardia, decreased BP, and altered mental status. Class IV (over 2000 mL) is immediately life-threatening. Field tools in this collection — pulse oximeters and blood pressure cuffs — allow tactical medics to classify shock severity and guide treatment decisions, including whether TXA (tranexamic acid) administration and fluid resuscitation are indicated per Joint Trauma System protocols.
What Should Be in a Prolonged Field Care Circulatory Kit?
For prolonged field care (PFC) — typically defined as care extending beyond one hour before CASEVAC — a circulatory monitoring kit should include: a manual BP cuff and stethoscope for trend tracking, a portable pulse oximeter with a wrist or forehead sensor option for continuous monitoring, IV catheter sets (18G and 16G), IV start supplies (alcohol preps, tourniquets, tape, extension sets), and 500–1000 mL of crystalloid solution (Lactated Ringer's preferred over NS for trauma patients). Access the complete PFC kit context in our Prolonged Field Care Kits collection.
Equip Your Circulatory Assessment Kit
BP monitors, pulse oximeters, stethoscopes, and IV supplies for field circulation management.
Frequently Asked Questions
What blood pressure reading indicates hemorrhagic shock in the field?+
In a trauma patient with suspected hemorrhagic shock, a systolic BP below 90 mmHg is the traditional threshold for Class III shock requiring aggressive intervention. The Joint Trauma System targets a permissive hypotension approach for isolated hemorrhage: maintain systolic BP of 80–90 mmHg until surgical hemorrhage control is achieved. For patients with traumatic brain injury, the target rises to ≥90 mmHg (some guidelines recommend ≥110 mmHg) to maintain cerebral perfusion pressure. Trending sequential readings is more informative than a single value.
What does a pulse oximeter measure and what are normal values?+
A pulse oximeter measures SpO2 — the percentage of hemoglobin in arterial blood that is saturated with oxygen — using photoplethysmography (light absorption differential between oxyhemoglobin and deoxyhemoglobin). Normal SpO2 is 95–100%. Values below 94% suggest hypoxemia requiring intervention; below 90% is a medical emergency. In trauma patients, low SpO2 may indicate tension pneumothorax, hemothorax, or airway obstruction alongside circulatory compromise. Peripheral vasoconstriction from hypothermia or shock can produce artificially low readings — forehead or ear sensors are more reliable in these conditions.
Can combat lifesavers (CLS) use IV supplies?+
CLS-trained personnel are authorized to establish peripheral IV access and administer approved fluids (Hextend, Lactated Ringer's) under TCCC protocols in the U.S. military context. Civilian scope-of-practice rules vary by state EMT certification level — EMT-Basic typically does not perform IV starts, while AEMT and Paramedic levels include IV access. Always verify scope of practice against your jurisdiction and certifying medical director's protocols. Pulse oximetry and blood pressure monitoring are within the scope of practice for all provider levels, including trained laypersons.
What type of stethoscope is best for tactical use?+
For tactical and field use, a durable, compact acoustic stethoscope is preferred over electronic models — eliminating battery dependency in the field. The Littmann Classic and Littmann Lightweight series are widely used by military and law enforcement medics for their balance of acoustic performance and portability. Tactical environments make auscultation difficult due to ambient noise; in these cases, blood pressure measurement by palpation (feeling for the radial pulse return during cuff deflation, indicating systolic BP) is a reliable alternative to auscultatory technique in high-noise situations.
How does hypothermia affect circulatory readings?+
Hypothermia causes progressive cardiovascular effects: initial tachycardia and peripheral vasoconstriction (directing blood to the core), followed by bradycardia, decreased cardiac output, and hypotension as core temperature drops below 32°C (90°F). Severe hypothermia below 30°C can cause ventricular fibrillation. Peripheral pulse oximetry will read artificially low due to peripheral vasoconstriction — use a forehead or ear sensor. BP readings may be difficult to obtain by auscultation as Korotkoff sounds diminish. Treat hypothermia alongside hemorrhagic shock management as part of the integrated MARCH approach.
When is IV fluid resuscitation indicated in the field?+
Per TCCC and JTS guidelines, IV fluid resuscitation is indicated when a casualty remains in shock (altered mental status, absent radial pulse, systolic BP below target thresholds) after hemorrhage control is achieved. Administer Hextend (500 mL) as the first-line colloid in military protocols, or Lactated Ringer's in civilian EMS settings. Avoid excessive crystalloid infusion — the "damage control resuscitation" approach prioritizes blood product ratios (plasma:red cells:platelets = 1:1:1) over large-volume crystalloids. For casualties who are ambulatory, talking, and with palpable radial pulses, withhold IV fluids and focus on hemorrhage control and monitoring.
Related Collections
All products sourced from the actual brand manufacturer or authorized master distributors. CoTCCC recommendation status verified where applicable. Ships from MED-TAC International, Pembroke Pines, FL — clinician-founded, veteran-led, SDVOSB-certified.
