5.5 Practice Drills and Readiness Markers
Key Takeaways
- Neonatal resuscitation follows the inverted pyramid: ~90% of newborns need only warm, dry, stimulate, and position; intubation, compressions, and drugs sit at the rare tip.
- Heart rate drives every neonatal decision: HR < 100/min after initial steps means start positive-pressure ventilation; HR < 60/min after 30 seconds of effective PPV means start chest compressions at 3:1.
- Neonatal chest compressions use a 3:1 compression-to-ventilation ratio (about 90 compressions and 30 breaths per minute); epinephrine is added if HR stays < 60/min after 60 seconds of compressions plus PPV.
- APGAR is scored at 1 and 5 minutes (0-2 each for appearance, pulse, grimace, activity, respirations) but never delays resuscitation.
- Warmth is a resuscitation step, not a comfort measure: hypothermia worsens neonatal acidosis and outcomes.
5.5 Practice Drills and Readiness Markers
Neonatal resuscitation is the capstone OB skill and a reliable source of exam items. The key mental model is the Neonatal Resuscitation Program (NRP) "inverted pyramid": the broad top represents the simple steps almost every newborn needs, and the narrow tip represents the rare advanced interventions.
The inverted pyramid
- Top (about 90% of newborns): warm, dry, stimulate, position the airway, and clear secretions only if needed.
- Middle: supplemental oxygen and positive-pressure ventilation (PPV).
- Lower: chest compressions.
- Tip (about 1%): medications (epinephrine) and volume.
The practical drill: at birth ask three questions — term? tone? breathing or crying? If yes to all, routine care with the mother (warm, dry, skin-to-skin). If not, move to the initial steps under a warmer. Warmth is itself a resuscitation step — neonatal hypothermia drives hypoglycemia and acidosis and worsens outcomes, so a wet, cold newborn must be dried and covered immediately (the large head is the main heat-loss surface).
Heart rate drives everything
After the 30 seconds of initial steps, reassess. Heart rate is the most important vital sign in the newborn and dictates each branch:
| Heart rate | Action |
|---|---|
| < 100/min (or apneic/gasping) | Start positive-pressure ventilation (PPV) — the single most important neonatal intervention |
| < 60/min after 30 sec of effective PPV | Add chest compressions at a 3:1 ratio (90 compressions + 30 breaths = 120 events/min), using the two-thumb encircling technique; increase oxygen to 100% |
| < 60/min after 60 sec of compressions + PPV | Give epinephrine (IV/IO preferred) and consider volume |
| > 100/min, breathing, pink | Routine/observational care |
Most neonatal "arrests" are respiratory in origin, which is why ventilation, not compressions or drugs, is the priority — the most common reason a newborn fails to improve is ineffective PPV (correct with the MR. SOPA steps: mask, reposition, suction, open mouth, pressure, alternate airway). Begin PPV in room air or blended oxygen titrated to preductal SpO2 targets (which start around 60% in the first minute and climb to 85-95% by 10 minutes — newborns are normally "blue" at birth), and escalate to 100% oxygen once compressions are needed.
The APGAR Score
The APGAR score is a standardized way to describe the newborn's condition and communicate it to the receiving team. It is assessed at 1 minute and 5 minutes after birth (and every 5 minutes up to 20 minutes if the score stays low). Critically, APGAR scoring never delays or directs resuscitation — you resuscitate based on the heart-rate algorithm and assign the score in parallel.
Each of five components scores 0, 1, or 2, for a maximum of 10:
| Sign | 0 | 1 | 2 |
|---|---|---|---|
| A – Appearance (color) | Blue/pale | Body pink, extremities blue (acrocyanosis) | Completely pink |
| P – Pulse (heart rate) | Absent | < 100/min | > 100/min |
| G – Grimace (reflex irritability) | No response | Grimace | Cry/cough/sneeze |
| A – Activity (muscle tone) | Limp | Some flexion | Active motion |
| R – Respirations | Absent | Slow/irregular | Strong cry |
General interpretation: 7-10 is reassuring, 4-6 is moderately depressed (needs stimulation/support), and 0-3 is severely depressed (active resuscitation). Acrocyanosis (blue hands and feet with a pink trunk) is normal in the first minutes and should not lose a color point on its own beyond the "1" for extremities.
Readiness drill
Run this rapid sequence aloud until automatic: term/tone/breathing? → warm-dry-stimulate-position → check HR → HR < 100 = PPV → HR < 60 after good PPV = 3:1 compressions + 100% O2 → HR < 60 after 60 sec = epinephrine. Then score APGAR at 1 and 5 minutes. If you can recite the heart-rate thresholds (100 and 60), the 3:1 ratio, and the five APGAR components without notes — and re-derive them after a day's break — you are ready for the neonatal items. Pair this with the OB-complication table from 5.4 so a precipitous field delivery flows seamlessly from maternal care into newborn care.
Readiness markers for the whole domain
You are ready for the Medical/OB-GYN block when you can hit five markers without notes. Dosing: epinephrine 0.3 mg IM for anaphylaxis, midazolam 10 mg IM for status epilepticus, magnesium 4 g for eclampsia, naloxone titrated to ventilation, and the neonatal heart-rate thresholds of 100 and 60. Recognition: spot the toxidrome, the DKA breathing pattern, or the hyperkalemic ECG inside a scenario stem that never names the diagnosis. Application: choose the next field action and name the rule behind it.
Distractor control: explain why fundal pressure, field insulin, or an aggressive blood-pressure drop in stroke is wrong. Retention: re-derive all of it after a day's break and keep your rationale quality stable. If your score collapses after time away, the knowledge is recognition-based and needs more active recall drilling. Because this is the largest exam domain and the CAT will keep probing your weak spots, the payoff for genuine mastery here is the highest of any chapter.
After 30 seconds of initial steps (warm, dry, stimulate, position), a newborn is apneic with a heart rate of 80/min. What is the single most important next intervention?
A newborn's heart rate remains 50/min after 30 seconds of effective positive-pressure ventilation. What is the correct next step and ratio?
At 1 minute of life a newborn has a heart rate of 120, a strong cry, active motion, a vigorous cough when suctioned, and a pink body with blue hands and feet. What is the APGAR score?