Distal Pulse
A pulse felt below (distal to) a wound or intervention site, used to confirm tourniquet effectiveness, assess limb perfusion, and identify vascular injury.
In the Field
Checking the distal pulse is what confirms a tourniquet is actually doing its job. If you place a CAT and the distal pulse remains, the tourniquet is not tight enough and the patient is still bleeding internally even if the external bleeding has slowed. Cranking the windlass until the distal pulse disappears is the field standard. The same principle applies to fracture and dislocation assessment, where loss of a distal pulse can indicate vascular injury that requires urgent intervention. The distal pulse check is one of the few quick objective measurements available in the field, and it answers questions that mental status and skin color cannot.
Common Mistake
Stopping tourniquet tightening when external bleeding slows or stops, when the distal pulse must be absent to confirm full arterial occlusion and complete bleeding control.
Technical Detail
The distal pulse is the pulse palpated at a location distal to (further from the heart than) a wound, intervention, or assessment point. It is one of the most useful objective field assessments in trauma care, providing immediate information about perfusion, vascular continuity, and intervention effectiveness.
Common distal pulse locations:
Radial pulse (wrist, thumb side). Distal to the elbow, used to assess upper extremity perfusion below an elbow injury or upper arm tourniquet.
Ulnar pulse (wrist, pinky side). Less commonly assessed but available distal to elbow.
Brachial pulse (inner arm). Used to assess upper extremity perfusion below a shoulder injury, but proximal to most upper extremity tourniquet positions.
Popliteal pulse (behind the knee). Used to assess lower extremity perfusion below a thigh injury.
Posterior tibial pulse (inner ankle). Distal to the knee, used to assess lower extremity perfusion below knee or thigh injury.
Dorsalis pedis pulse (top of foot). Most distal lower extremity pulse, assessed for ankle and foot perfusion.
Pulse assessment after tourniquet application. The single most operationally important use of distal pulse assessment is verifying tourniquet effectiveness. A properly applied tourniquet should occlude arterial flow completely, eliminating the distal pulse on the affected limb. The procedure is:
Apply the tourniquet proximal to the wound on the affected limb.
Tighten the windlass progressively while checking for a distal pulse on the same limb.
Continue tightening until the distal pulse is absent on palpation.
If the distal pulse remains palpable, the tourniquet is inadequately tightened. Continue tightening, or apply a second tourniquet just proximal to the first if maximum tightening of the first does not eliminate the pulse.
Document the time of application.
A patient with a tourniquet in place but a palpable distal pulse on the affected limb is still bleeding internally. The external bleeding may have slowed because venous flow is occluded faster than arterial flow, but blood is still being pumped past the tourniquet and out through the wound. This is a common and serious error that can be detected only by checking the distal pulse.
Pulse assessment in fracture and dislocation. Distal pulse assessment is also a routine part of fracture and dislocation evaluation:
A patient with a long bone fracture (femur, tibia, humerus) or major joint dislocation (knee, elbow, shoulder) is at risk of vascular injury from the bone fragments or displaced anatomy.
Loss or significant reduction of the distal pulse compared to the uninjured limb suggests vascular compromise.
Vascular compromise from a fracture or dislocation is a time-sensitive problem. Reduction of the dislocation or alignment of the fracture may restore distal pulse, and rapid orthopedic and vascular evaluation is required to prevent limb loss.
Pulse assessment in compartment syndrome. Compartment syndrome is increased pressure within a muscle compartment, often after crush injury or vascular reperfusion. Distal pulses are typically preserved in compartment syndrome (the pressure is on small vessels, not the major arteries), so loss of distal pulse is a late and ominous sign rather than an early diagnostic indicator.
Pulse oximetry as adjunct. In settings where pulse oximetry is available, the pulse oximeter can provide both pulse rate and an indication of perfusion (the oximeter requires a palpable pulse to function). Pulse oximetry can supplement but does not replace manual distal pulse assessment.
Field application principles:
Always compare the affected limb to the uninjured limb. The patient's normal pulse strength is the baseline.
Document pulse findings, including presence/absence, strength, and rate.
Reassess after any intervention or movement. A distal pulse that was present can become absent during transport.
Reassess after any reduction or alignment in fracture or dislocation management. Restoration of pulse confirms successful intervention.
Procurement and training implications. Distal pulse assessment is taught in:
Stop the Bleed and basic civilian first responder courses (in the context of tourniquet application).
EMT and paramedic curricula (full clinical assessment).
TCCC and TECC training at all tiers.
Equipment requirements are minimal. The skill is the primary investment, and ongoing skill maintenance through training is essential. Pulse assessment is simple to teach and difficult to master under stress, particularly through tactical gloves or in low-light conditions.
Common distal pulse locations:
Radial pulse (wrist, thumb side). Distal to the elbow, used to assess upper extremity perfusion below an elbow injury or upper arm tourniquet.
Ulnar pulse (wrist, pinky side). Less commonly assessed but available distal to elbow.
Brachial pulse (inner arm). Used to assess upper extremity perfusion below a shoulder injury, but proximal to most upper extremity tourniquet positions.
Popliteal pulse (behind the knee). Used to assess lower extremity perfusion below a thigh injury.
Posterior tibial pulse (inner ankle). Distal to the knee, used to assess lower extremity perfusion below knee or thigh injury.
Dorsalis pedis pulse (top of foot). Most distal lower extremity pulse, assessed for ankle and foot perfusion.
Pulse assessment after tourniquet application. The single most operationally important use of distal pulse assessment is verifying tourniquet effectiveness. A properly applied tourniquet should occlude arterial flow completely, eliminating the distal pulse on the affected limb. The procedure is:
Apply the tourniquet proximal to the wound on the affected limb.
Tighten the windlass progressively while checking for a distal pulse on the same limb.
Continue tightening until the distal pulse is absent on palpation.
If the distal pulse remains palpable, the tourniquet is inadequately tightened. Continue tightening, or apply a second tourniquet just proximal to the first if maximum tightening of the first does not eliminate the pulse.
Document the time of application.
A patient with a tourniquet in place but a palpable distal pulse on the affected limb is still bleeding internally. The external bleeding may have slowed because venous flow is occluded faster than arterial flow, but blood is still being pumped past the tourniquet and out through the wound. This is a common and serious error that can be detected only by checking the distal pulse.
Pulse assessment in fracture and dislocation. Distal pulse assessment is also a routine part of fracture and dislocation evaluation:
A patient with a long bone fracture (femur, tibia, humerus) or major joint dislocation (knee, elbow, shoulder) is at risk of vascular injury from the bone fragments or displaced anatomy.
Loss or significant reduction of the distal pulse compared to the uninjured limb suggests vascular compromise.
Vascular compromise from a fracture or dislocation is a time-sensitive problem. Reduction of the dislocation or alignment of the fracture may restore distal pulse, and rapid orthopedic and vascular evaluation is required to prevent limb loss.
Pulse assessment in compartment syndrome. Compartment syndrome is increased pressure within a muscle compartment, often after crush injury or vascular reperfusion. Distal pulses are typically preserved in compartment syndrome (the pressure is on small vessels, not the major arteries), so loss of distal pulse is a late and ominous sign rather than an early diagnostic indicator.
Pulse oximetry as adjunct. In settings where pulse oximetry is available, the pulse oximeter can provide both pulse rate and an indication of perfusion (the oximeter requires a palpable pulse to function). Pulse oximetry can supplement but does not replace manual distal pulse assessment.
Field application principles:
Always compare the affected limb to the uninjured limb. The patient's normal pulse strength is the baseline.
Document pulse findings, including presence/absence, strength, and rate.
Reassess after any intervention or movement. A distal pulse that was present can become absent during transport.
Reassess after any reduction or alignment in fracture or dislocation management. Restoration of pulse confirms successful intervention.
Procurement and training implications. Distal pulse assessment is taught in:
Stop the Bleed and basic civilian first responder courses (in the context of tourniquet application).
EMT and paramedic curricula (full clinical assessment).
TCCC and TECC training at all tiers.
Equipment requirements are minimal. The skill is the primary investment, and ongoing skill maintenance through training is essential. Pulse assessment is simple to teach and difficult to master under stress, particularly through tactical gloves or in low-light conditions.