CPR Refresher: The Steps People Forget, and How to Keep Them

Resuscitation skills decay faster than almost anything else clinicians learn. Objective performance measures — compression depth, rate, chest recoil, and hands-off time — deteriorate measurably within months of a training course, often well before the next scheduled refresher. The failures are rarely conceptual. Almost everyone knows to push hard and fast. What erodes is the execution detail, and the detail is what determines coronary and cerebral perfusion.

Key points

• High-quality compressions with full recoil and minimal interruption matter more than any drug or adjunct.
• Perishoc, peri-shock pauses and cumulative hands-off time are the most common and most correctable quality failures.
• Rescuer fatigue degrades depth long before the rescuer notices; rotate at short fixed intervals.
• Leaning on the chest between compressions is common, invisible without feedback, and reduces venous return.
• Brief, frequent, low-stakes practice retains skill far better than an annual full-day course.

The fundamentals, restated precisely

Recognition first: an unresponsive person who is not breathing normally is in cardiac arrest until proven otherwise. Agonal gasping is the single most consequential misread in the sequence — it is present in a substantial minority of arrests and is routinely mistaken for breathing, delaying compressions by minutes. Occasional gasping is not breathing. Start.

Compressions go on the lower half of the sternum, with the heel of one hand and the other on top, elbows locked, shoulders directly over the hands so force comes from the trunk rather than the arms. Depth for an adult is at least 5 cm and not more than 6 cm; rate is 100 to 120 per minute. Complete recoil between each compression is non-negotiable, and it is the element most often lost when the rescuer tires.

Ventilation at a 30:2 ratio for the untrained-adjacent single rescuer without an advanced airway; once an advanced airway is in place, compressions become continuous with asynchronous ventilation. Over-ventilation is a persistent problem in real resuscitations: it raises intrathoracic pressure, reduces venous return, and reduces coronary perfusion pressure. Deliver just enough volume to see the chest rise.

The steps people actually forget

Full chest recoil

Leaning is the quiet failure. Rescuers unconsciously rest weight on the chest between compressions, particularly as fatigue accumulates, which prevents the chest from fully re-expanding and blunts the negative intrathoracic pressure that fills the right heart. It cannot be felt reliably by the person doing it. The fixes are mechanical: lift the heel of the hand slightly off the sternum at the top of each compression, and use real-time feedback devices when available.

Peri-shock pauses

Every second between stopping compressions and delivering a shock costs perfusion pressure that takes many compressions to rebuild. The disciplined pattern is to continue compressions while the defibrillator charges, clear only at the moment of discharge, and resume immediately after the shock without waiting to assess rhythm or pulse. Announce the plan out loud before charging so the team moves as one.

Rhythm and pulse check discipline

Rhythm checks should be brief and time-limited. Prolonged pulse-seeking at the carotid is unreliable even among experienced clinicians and consumes hands-off time. Decide, resume, and use the intervening cycle to prepare the next intervention.

Rescuer rotation

Compression depth degrades within a couple of minutes, well before the rescuer reports fatigue. Rotate at the rhythm check every two minutes, and make the rotation itself fast — the incoming rescuer should be kneeling in position, hands hovering, before the outgoing one lifts off.

Hand position drift

Over successive cycles, hands migrate cephalad or laterally. A brief visual reset at each rotation costs nothing.

Surface and access

A soft mattress absorbs a meaningful fraction of compression depth. Use a backboard or move the patient to the floor when feasible, and remember that a bed's CPR-release lever exists for exactly this reason. Ensure the chest is exposed before pads are needed rather than fumbling with clothing mid-arrest.

Defibrillation details worth rehearsing

Pad placement is anterolateral by default: one below the right clavicle, one at the left mid-axillary line at the level of the fifth or sixth intercostal space, well below the axilla rather than on it. Anteroposterior is an acceptable alternative. Shave dense chest hair only if it prevents adhesion, and do so in seconds, not minutes. Move pads away from an implanted device by a hand's breadth. Remove transdermal patches from the pad site and wipe the skin. In a wet patient, dry the chest before applying pads.

The interval from arrest recognition to first shock in a shockable rhythm is one of the few variables with a large and well-established relationship to survival. Everything in the workflow should be arranged to shorten it: know where the nearest defibrillator is on every unit you work in, and have someone fetch it while compressions start.

Reversible causes, without the recitation

The standard mnemonic lists are useful only if they prompt action. In practice, the causes worth actively excluding during a resuscitation are hypoxia, hypovolaemia including haemorrhage, hypo- and hyperkalaemia, hypothermia, tension pneumothorax, tamponade, toxins, and thrombosis — coronary or pulmonary. Assign one team member to work through them aloud while compressions continue. Point-of-care ultrasound can help identify tamponade, gross right heart strain, and severe hypovolaemia, but it must be done during a rhythm check in a strictly limited window, with the probe on the chest before compressions stop and off before they resume. Ultrasound that lengthens hands-off time causes net harm.

Why skills decay, and what to do about it

The evidence on retention is consistent: performance measured objectively falls off within months of certification, and self-assessed confidence does not track actual skill. Long refresher intervals are a poor match for that decay curve. What works better is distributed low-dose practice — short, frequent sessions on a feedback-enabled manikin, integrated into normal working time rather than scheduled as an event.

Three habits pay disproportionate returns. First, practise on a manikin that reports depth, rate, and recoil, because unaided self-assessment is unreliable. Second, rehearse the team choreography — who compresses, who runs the defibrillator, who tracks time and causes — since most real-world delay is coordination failure rather than individual skill failure. Third, debrief real arrests using defibrillator-recorded quality data; teams that review their own numbers improve them.

Mental rehearsal is a legitimate adjunct. Walking through the first ninety seconds of an arrest on your own unit — where the trolley is, who you would call, how you would get the backboard under the patient — shortens real response time at no cost.

You can practise this topic with cited sources and a virtual patient at app.medicaltraining.ai.

Educational content for healthcare professionals. It is not medical advice and does not replace clinical judgement or local protocols.