9.1 When to Start Chest Compressions

Why Compressions Come Late in the Algorithm

In adult ACLS, chest compressions often start early because primary cardiac arrest is common. Neonatal resuscitation is the opposite. Almost every newborn who is bradycardic is bradycardic because the lungs have not yet delivered oxygen—not because a coronary plaque closed or a primary arrhythmia struck. That physiology drives a non-negotiable sequence: ventilate first, compress only if the heart rate stays critically low despite effective ventilation.

Roughly 10% of newborns need some help to begin breathing; only about 1% need extensive resuscitation that includes chest compressions or medications. If your mental model reaches for compressions the moment heart rate falls below 100, you will fail NRP scenarios and—more importantly—delay the intervention that actually saves most babies: effective positive-pressure ventilation (PPV).

This section locks the indication for compressions so you never start them too early, too late, or for the wrong reason.

The Exact Indication (Memorize Verbatim)

Begin chest compressions when the heart rate remains below 60 beats per minute after at least 30 seconds of effective PPV.

Unpack every word:

Contrast this with earlier thresholds you already know:

• Apnea, gasping, or HR <100 after initial steps → start PPV (not compressions).
• HR <60 after ≥30 s of effective PPV → add chest compressions (and increase oxygen to 100%; next section covers coordination).

Collapsing “HR <100” and “HR <60” into one response is a classic trap. Heart rate of 70 with a non-moving chest needs better ventilation, not thumbs on the sternum.

“Effective” PPV: The Gate You Must Pass

NRP is explicit: do not start compressions for low heart rate while ventilation is still ineffective. Compressions circulate blood; they do not open alveoli or clear a blocked airway. Circulating deoxygenated blood through an unventilated lung does not reverse hypoxic bradycardia.

Signs that PPV is (or is not) effective

Effective enough to start the 30-second clock (and to trust the decision later):

• Visible chest rise with each breath
• Preferably a rising heart rate (best overall indicator that gas exchange is improving)
• Improving color/tone as secondary signs once HR climbs

Ineffective—fix ventilation, do not escalate to compressions yet:

• No or minimal chest movement despite bagging
• Heart rate stuck low or falling while the bag is being squeezed
• Mask leak, wrong head position, secretions, closed mouth, inadequate pressure, or need for alternative airway (MR SOPA pathway)

If the chest is not moving, your next moves are MR SOPA corrective steps and, when needed, an advanced airway (endotracheal tube or laryngeal mask)—not the start of coordinated CPR. The exam loves vignettes where HR is 50–55, the team never checked for chest rise, and the correct answer is still “improve ventilation / secure airway,” not “begin compressions immediately.”

Advanced airway when compressions are starting

When the indication for compressions is truly met, NRP recommends intubation or placement of a laryngeal mask if an advanced airway is not already in place. Why?

1. Face-mask ventilation is hard to coordinate with compressions and often becomes intermittent or ineffective under stress.
2. A secured airway lets one team member deliver reliable breaths during the ventilation pause of the 3:1 cycle.
3. An advanced airway is already part of optimizing ventilation when bradycardia is this severe.

You do not wait forever for a perfect tube if someone is struggling and the baby is profoundly bradycardic—but the recommended path is clear: secure ETT or LMA as you enter the compression phase so the 3:1 sequence has a reliable ventilation partner.

How the Decision Looks in Real Time

A practical loop for the delivery room:

1. Identify need for PPV (apnea/gasping or HR <100 after initial steps).
2. Start PPV at 30–60 breaths/min; place ECG leads and pulse oximeter early when intervening.
3. Assess effectiveness within ~15–30 seconds—chest rise? HR starting to climb?
4. If ineffective → MR SOPA, escalate pressure or alternative airway as indicated; reassess after short series of corrective breaths.
5. If effective PPV has been ongoing for at least ~30 seconds and HR is still <60 → begin chest compressions, increase FiO₂ to 100%, ensure advanced airway if possible, assign roles, and start the 3:1 cadence.
6. If HR rises above 60 with ventilation alone → do not start compressions; continue high-quality PPV and titrate oxygen as the infant recovers.

Call-outs that sound NRP-correct: “Chest is rising, heart rate still 50 after thirty seconds of effective PPV—starting compressions and going to 100% oxygen.” Call-outs that sound wrong: “Heart rate 55, no chest movement—start compressions now.”

Scenarios That Test the Indication

Scenario A — Too early. Term infant, HR 80 after drying and stimulation. Team member reaches for the chest. Correct action: begin PPV (HR <100), not compressions. Compressions wait for HR <60 after effective ventilation.

Scenario B — Ineffective ventilation. Preterm infant, face-mask PPV for 45 seconds, no chest rise, HR 48. Correct priority: MR SOPA / alternative airway, not automatic compressions on a non-moving chest. Once ventilation is effective and HR remains <60 for the required interval, add compressions.

Scenario C — Correct start. After intubation and effective PPV with bilateral breath sounds and chest movement for ≥30 seconds, ECG shows HR 40–50. Correct action: start chest compressions, 100% oxygen, coordinate 3:1, reassess in about 60 seconds.

Scenario D — Wrong trigger. Cyanosis with HR 110 and labored breathing. Correct path: oximetry, free-flow O₂/CPAP considerations—not compressions. Color and saturation problems with adequate heart rate are not compression indications.

Scenario E — Apgar distraction. One-minute Apgar is 2. Someone says, “Apgar is low—start compressions.” Correct thinking: Apgar scores do not drive the algorithm. Use heart rate, breathing, and tone with the algorithm thresholds. A low Apgar may correlate with need for help, but the compression decision is still HR <60 after effective PPV.

Why “Fix Ventilation First” Is Not Optional Philosophy

Secondary apnea and progressive bradycardia reflect asphyxia. The myocardium is hypoxic; coronary perfusion during compressions only helps if oxygenated blood can be generated. Without alveolar ventilation:

• Pulmonary vascular resistance stays high
• Oxygen content of blood remains critically low
• Compressions may produce a pulse on the monitor without meaningful recovery
• Teams burn cognitive bandwidth on technique while the real problem—air entry—is unsolved

NRP therefore treats the compression box as a conditional branch, not a default next step after any bad number. Mastering the indication protects both the infant and your exam performance.

Team Roles at the Moment of Decision

When HR is trending toward the compression threshold, the leader should already be:

• Confirming chest movement and advanced-airway status
• Calling for ECG confirmation of rate (preferred when intervening)
• Pre-assigning who will compress, who will ventilate, who will prepare umbilical access/epinephrine if needed
• Stating the decision out loud: “Heart rate still less than 60 after effective ventilation—start compressions.”

Closed-loop communication prevents two people bagging while nobody compresses, or thumbs starting before the airway is optimized.

Key Distinctions for Quick Review

If you remember only one sentence: Compressions treat persistent HR <60 after the lungs are actually being ventilated—not before.