Cardiopulmonary arrest (Canine) — NAVLE Prep

Quick anchor

Trigger

Unresponsive, apneic, pulseless patient

First step

Start CPR immediately

Rhythm branch

Shockable versus non-shockable rhythm

Trap

Do not waste time on prolonged pulse checks

Exam core — read this first

Recognition → no effective pulse, no breathing, unresponsive patient

Immediate action → begin high-quality chest compressions and ventilation without delay

Rhythm logic → VF/pulseless VT differ from PEA/asystole in next steps

After ROSC → the case becomes post-arrest critical care, not “finished”

Pattern recognition

Core pattern

UnresponsiveNo normal breathingNo effective pulse

Supporting clues

Sudden collapseSevere bradycardia may precede arrestKnown anesthesia riskMajor traumaTerminal heart disease or shock state

NAVLE trigger: NAVLE usually rewards immediate recognition and CPR sequence, not delay for elaborate diagnostics.

Decision core — what NAVLE actually asks

Confirmed arrest

→ Start chest compressions and basic life support immediately

Shockable rhythm present

→ Defibrillation becomes part of the algorithm while CPR continues

ROSC achieved

→ Stabilize perfusion, oxygenation, temperature, and investigate cause

Key interpretation

Pulse check

< 10 seconds

Long checks lose the case

ECG rhythm

Guides ALS

VF/pVT versus PEA/asystole matters

ETCO2

Useful monitor

Helps judge CPR effectiveness and ROSC

VF / pulseless VT

Shockable

Defibrillation logic

PEA / asystole

Non-shockable

CPR + reversible-cause search

Post-ROSC

Still critical

Reperfusion and recurrence risk remain

⚠ A monitor rhythm without a pulse can still be arrest. Pulseless electrical activity is not “good enough circulation.”

Treatment

Step 1

Immediate high-quality CPR with airway and ventilation support

Start before you get lost in details.

Step 2

Advanced life support based on rhythm and reversible causes

Shockable and non-shockable rhythms diverge here.

Step 3

Post-ROSC critical care

Recurrence, hypoperfusion, and the underlying cause still have to be managed.

NAVLE traps — where students lose marks

Do not spend a long time “making sure” there is no pulse

Pulse checks should be brief; compressions are time-critical.

PEA is still arrest

Electrical activity without perfusion does not count as circulation.

Airway procedures should not cause prolonged compression interruptions

Compression quality matters.

ROSC does not end the emergency

Post-arrest care is a second high-yield phase.

Differentials — how to separate these on NAVLE

Fast separator: Differentiate true arrest from severe syncope or shock, then sort shockable from non-shockable rhythms once CPR begins.

Problem	Pulse	Breathing	Key separator
Cardiopulmonary arrest	Absent	Absent / agonal	Immediate CPR
Syncope	Usually returns	Present after episode	Not persistently pulseless
Profound shock	Weak but present	Present	Still perfusing somewhat
Seizure	Present	Present	Convulsive activity, not pulseless arrest
Respiratory arrest only	Present initially	Absent	Can progress to CPA if missed

30-second revision

RecognizePulseless + apneic + unresponsive

First actionStart CPR

Rhythm splitShockable vs non-shockable

Do not waste timePulse checks and interruptions

After ROSCStill critical-care patient

Practice questions

Pre-built NAVLE-style · Cardiopulmonary arrest

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Q1Recognition

Which finding best defines canine cardiopulmonary arrest?

Q2Immediate action

What is the most appropriate immediate response to confirmed cardiopulmonary arrest?

Q3Rhythm reasoning

Why does ECG rhythm classification matter during arrest management?

Q4Trap question

Which statement about pulseless electrical activity is most accurate?

Q5Post-ROSC

What is the best statement about return of spontaneous circulation (ROSC)?