Once you start CPR in Calgary, the rule is simple: keep going until one of seven specific conditions is met. Stopping prematurely can turn a survivable arrest into a fatality. This guide walks through each of the 7 recognised reasons to stop, in the order Canadian first aid programs teach them, and explains what they mean in a real Calgary emergency.
Reason 1: EMS or a Trained Responder Arrives and Takes Over
The most common reason to stop is that Calgary EMS, a firefighter, or another trained responder arrives, assesses the situation, and takes over compressions. Do not stop until they physically take over or explicitly tell you to stop. When they take over:
- Move aside efficiently — do not remove your hands until theirs are in position
- Tell them how long CPR has been in progress, any AED shocks delivered, and any known patient information
- Follow further instructions from the incident commander
Calgary EMS response times in urban areas typically run 6–12 minutes for cardiac arrest calls. In outlying suburbs and rural municipalities, response can be longer — keep compressing until they arrive.
Reason 2: The Patient Shows Signs of Life
If the patient starts breathing normally, moves purposefully, coughs, or otherwise shows unmistakable signs of life, stop compressions and reassess. Signs of life:
- Normal breathing (not agonal gasping, which sounds like snoring or gulping and is NOT effective breathing)
- Purposeful movement
- Coughing or gagging
- Eye opening in response to touch or voice
- Speaking
After stopping, place the patient in the recovery position if they are breathing normally, monitor closely, and be ready to resume CPR if they arrest again. Do not leave them alone. Stay on the phone with Calgary 911 dispatch.
Reason 3: You Are Physically Exhausted and No Rescuer Is Available to Take Over
Effective CPR is physically demanding. Fatigue significantly reduces compression quality after 2–3 minutes. If a second trained rescuer is present, rotate every 2 minutes to maintain quality. If you are alone and physically cannot continue effective compressions:
- Continue if at all possible — even reduced-quality compressions are better than none
- Take brief pauses only if necessary — interruptions reduce survival
- Ask any nearby bystanders to help — anyone can perform hands-only CPR under 911 dispatcher guidance
Physical exhaustion of a solo untrained bystander is a recognised reason to stop, but stop reluctantly. Once you stop and cannot resume, the patient’s survival odds fall sharply.
Reason 4: The Scene Becomes Unsafe
Your safety comes first. If the scene becomes actively dangerous, retreat to safety — a rescuer who becomes a second casualty helps no one. Scene dangers that require you to stop:
- Fire, smoke, or explosion risk near the patient
- Structural collapse hazard
- Aggressive person or ongoing violence
- Toxic gas atmosphere (H2S, carbon monoxide, chlorine) without appropriate PPE
- Traffic on a roadside
- Electrical hazard including downed lines
Once the scene is secured — either by first responders or removal of the hazard — resume CPR if the patient is still in arrest.
Reason 5: A Valid Do Not Resuscitate (DNR) Order Is Presented
In Alberta, a valid Personal Directive or Goals of Care Designation (GCD) may include a DNR (Do Not Resuscitate) instruction. If a legitimate DNR document is presented at the scene — typically by family, a caregiver, or found in the patient’s personal documents — and it clearly indicates no resuscitation, you may stop CPR.
- The DNR must be a valid written document. Verbal statements alone from family, without documentation, are not sufficient for a lay rescuer to stop.
- Alberta Health Services provides Green Sleeves — a green plastic envelope containing a patient’s Personal Directive and GCD. If you see one at the scene, alert EMS.
- If in doubt, continue CPR. Alberta EMS medics will make the DNR determination on arrival.
Reason 6: Obvious Signs of Irreversible Death
Very rarely, a lay rescuer will encounter obvious signs of death that make CPR futile:
- Decapitation or massive traumatic injuries incompatible with life
- Decomposition
- Rigor mortis (stiffening)
- Dependent lividity (pooling of blood in the lowest body parts, showing as purple/red patches)
These signs indicate the patient has been dead for a significant period and CPR cannot restore life. In these cases, do not begin or continue CPR. Call 911 and stay at the scene until Calgary EMS or police arrive.
Reason 7: A Physician or Higher Medical Authority Pronounces Death or Terminates Resuscitation
On scene, a physician (MD), Alberta paramedic in consultation with a medical control physician, or hospital emergency staff may formally terminate resuscitation. This is a medical decision based on:
- Time in arrest without return of spontaneous circulation (ROSC)
- Underlying medical conditions
- Response to advanced interventions (medications, defibrillation)
- Patient’s wishes documented in valid directives
Once formal termination is called, no further CPR is required. Follow the physician’s or paramedic’s instructions.
What NOT to Do — Common Mistakes
- Stopping to check for pulse repeatedly. Modern CPR guidelines minimise pulse checks — interruptions reduce survival. Continue compressions unless signs of life are obvious.
- Stopping because “it’s been too long.” Only a physician or paramedic can make this determination. Bystanders continue until EMS takes over.
- Stopping because of exhaustion when help is available. Any adult bystander can be coached to continue compressions by 911 dispatch. Ask for help.
- Stopping because family says to stop without a written DNR. Verbal statements from family alone are not sufficient for a lay rescuer to stop. Continue and let EMS make the determination.
- Refusing to hand over to arriving EMS. Yield efficiently — do not obstruct the professional response.
Calgary EMS Response Context
Alberta Health Services EMS provides ground ambulance service in Calgary. Response times vary by call location, time of day, and system load. Urban Calgary median cardiac-arrest response is typically 6–12 minutes; suburban response can be 12–20 minutes; rural municipalities within the Calgary catchment can be 20+ minutes. STARS Air Ambulance provides critical-care transport for major trauma and rural incidents.
Every minute of continued bystander CPR before EMS arrival improves survival — keep going.
Frequently Asked Questions
When is it OK to stop CPR in Calgary?
There are 7 recognised reasons: EMS or trained responder takes over; signs of life return; you are physically exhausted with no one to take over; the scene becomes unsafe; a valid DNR is presented; obvious signs of irreversible death; a physician or paramedic terminates resuscitation.
Can I stop CPR if I’m tired?
Only as a last resort, and only if you are physically incapable of continuing effective compressions and no one else is available to take over. Ask nearby bystanders to help — anyone can be coached by 911 dispatch.
Do I have to keep doing CPR until the ambulance arrives?
Yes, unless one of the 7 recognised reasons to stop applies. Every minute of continued CPR improves survival odds.
Is a family member telling me to stop CPR enough reason to stop?
No, not without a valid written DNR document. Verbal statements from family alone are not sufficient for a lay rescuer to stop. Continue and let EMS make the determination on arrival.
What is a DNR in Alberta and how do I recognise it?
In Alberta, DNR instructions typically appear in a Personal Directive or Goals of Care Designation (GCD). Alberta Health Services provides Green Sleeves — green plastic envelopes containing these documents — often kept on the fridge or bedside.
How long does Calgary EMS take to respond to a cardiac arrest?
Urban Calgary median response is typically 6–12 minutes; suburban 12–20 minutes; rural 20+ minutes. Keep performing CPR until they arrive.
Am I legally protected if the patient dies during my CPR?
Yes. Alberta’s Emergency Medical Aid Act protects bystanders acting in good faith from civil liability, regardless of outcome, provided they were not grossly negligent.
