12.2 Congenital Anomalies Affecting Resuscitation

Special Anatomy, Same Priorities—With Modified Tactics

Most NRP scenarios assume a structurally normal airway and chest. A minority of newborns have congenital anomalies that make standard mask ventilation, positioning, or abdominal handling ineffective or harmful. You do not need to become a pediatric surgeon for Provider-level NRP, but you do need delivery-room implications for three high-yield groups:

1. Airway anomalies (especially micrognathia / Pierre Robin sequence)
2. Congenital diaphragmatic hernia (CDH)
3. Abdominal wall defects (gastroschisis, omphalocele)

The algorithm’s spirit stays the same—warm, open airway, breathe for the baby, support circulation—but the how changes. Antenatal diagnosis should trigger a pre-birth briefing: who intubates, what positioning will be tried first, what to avoid (for example prolonged bag-mask in known CDH), and where the infant goes after stabilization.

Airway Anomalies: Micrognathia and Pierre Robin Sequence

The problem

In Pierre Robin sequence (and related severe micrognathia), the mandible is small, the tongue is relatively large and posterior, and a cleft palate may be present. In the supine position the tongue falls back and obstructs the airway. Face-mask ventilation can be extremely difficult because you cannot create a seal or open the pharyngeal airway with usual head positioning alone.

Delivery-room tactics

Key teaching points:

• Do not waste prolonged minutes only in classic supine sniffing position if the anomaly is known or obvious and the chest is not moving.
• Positioning is a first-line airway intervention for Pierre Robin—not a comfort measure.
• Plan who will manage the difficult airway before birth when the diagnosis is known; have appropriately sized alternative airways ready.
• Once the airway is open and heart rate responds, maintain the position that works during transfer (prone/lateral as appropriate with monitoring).

Exam vignette pattern

“Newborn with small jaw and glossoptosis, poor chest rise with standard mask PPV supine.” Correct answers emphasize reposition prone/lateral, optimize airway, prepare advanced airway—not immediately starting compressions without fixing the airway, and not ignoring the anatomic clue.

Other airway anomalies (choanal atresia, severe neck masses, laryngeal webs) are less commonly detailed on basic items, but the unifying principle is the same: anticipate failure of routine mask ventilation, call for help early, and use the technique that opens this airway.

Congenital Diaphragmatic Hernia (CDH)

The problem

In CDH, abdominal organs herniate into the chest through a diaphragmatic defect (classically left-sided). The lungs are hypoplastic and pulmonary hypertension is common. Bag-mask ventilation forces gas into the stomach and intestines, which already occupy thoracic space; gastric distention further compresses the lungs and worsens ventilation. That is why NRP and neonatal teams teach a modified approach when CDH is known or strongly suspected.

Delivery-room implications (focus, not surgery)

1. Immediate priorities still apply: dry/stimulate as needed, assess tone/breathing/HR, and support temperature. Do not skip life-threatening bradycardia assessment because of the diagnosis label.
2. Avoid prolonged bag-mask ventilation when CDH is known. Prefer early endotracheal intubation so positive pressure goes into the lungs, not the gut.
3. Place an orogastric (or nasogastric) tube to decompress the stomach and free residual thoracic space; connect to intermittent or continuous suction per local practice once the airway is secured.
4. Provide gentle ventilation; these lungs are fragile—avoid excessive pressures when possible while still achieving chest movement and heart-rate response.
5. Expect possible need for higher-level respiratory support and rapid transfer to a center with CDH/NICU surgical capability.

Unknown CDH presenting as “difficult ventilation”

If CDH was not diagnosed antenatally, the first clue may be asymmetric breath sounds, scaphoid abdomen, and persistent difficulty ventilating. You still follow NRP logic (effective ventilation, MR SOPA, advanced airway). Once CDH is suspected after intubation, decompress the stomach and avoid further unnecessary mask ventilation. Do not invent a full surgical plan at the warmer—stabilize and transfer.

Exam trap: Choosing “continue bag-mask only for 10 more minutes” for a known CDH infant with respiratory failure. Correct direction: intubate early, decompress stomach, support circulation as needed.

Abdominal Wall Defects: Gastroschisis and Omphalocele

The problem

• Gastroschisis: bowel (and sometimes other viscera) protrudes through a defect usually to the right of the umbilicus without a covering membrane.
• Omphalocele: abdominal contents herniate into the umbilical cord base and are covered by a membrane (unless ruptured).

These defects are dramatic but usually not primary airway problems. Delivery-room risk is heat loss, fluid loss, trauma to bowel, infection risk, and circulatory compromise if the defect is mishandled—plus any associated conditions (especially with omphalocele, which can co-occur with other anomalies).

Delivery-room management principles

1. Airway, breathing, circulation first if the infant is depressed—do not ignore resuscitation because viscera are exposed.
2. Handle gently. Support the bowel; avoid twisting the mesentery or letting the weight of the bowel hang unsupported in a way that kinks vessels.
3. Cover and protect exposed viscera with sterile technique as available—commonly warm sterile saline-soaked gauze and a covering (or a bowel bag / transparent dressing per unit protocol) to reduce evaporative heat and fluid loss and to protect tissue.
4. Thermoregulation is critical—large surface area of wet bowel accelerates hypothermia.
5. Place the infant in a position that does not stretch or kink the bowel (often right side slightly down for gastroschisis, following local practice).
6. Insert gastric decompression as indicated to reduce bowel distention.
7. Establish vascular access and fluid plans per neonatal protocol; transfer to a surgical NICU.
8. Do not attempt to force viscera back into the abdomen in the delivery room.

Antenatal Planning Changes Everything

When anomalies are known before birth:

• Pre-birth questions and briefing should name the anomaly and the modified plan (prone positioning ready; intubation-first CDH plan; sterile covers for wall defects).
• Ensure correct equipment: appropriate ETTs, OG tubes, difficult-airway adjuncts, sterile wraps, radiant warmer ready.
• Assign roles: who intubates, who manages the defect covering, who documents and updates parents.
• Decide location of delivery when possible (center with NICU/surgery) and immediate postnatal destination.

Unknown anomalies still appear. Use the general rule: if standard PPV fails, think anatomy—position, obstruction, CDH, pneumothorax—while running MR SOPA and calling for help.

Scenario Drill

Scenario A — Pierre Robin. Small jaw, supine mask PPV with no chest rise. Correct: prone or lateral positioning, airway optimization, advanced airway readiness—not endless ineffective supine bagging.

Scenario B — Known CDH. Antenatal left CDH, infant cyanotic and bradycardic. Correct path after immediate assessment: early intubation rather than prolonged bag-mask, orogastric decompression, careful ventilation, NICU pathway.

Scenario C — Gastroschisis. Vigorous cry, HR 150, large amount of exposed bowel. Correct: minimal resuscitation needed for ABCs, focus on cover, warmth, support bowel, gastric tube, transfer—not emergency laparotomy in L&D.

Scenario D — Distraction. Team stares at omphalocele while infant is apneic and HR 50. Correct: resuscitate the baby first (PPV/airway), protect the defect concurrently, not instead of ventilation.

What NRP Expects You to Master (and Not Invent)

Master delivery-room implications. You are not required to list every surgical staging system for CDH or every chromosomal association of omphalocele. You are required to:

• Modify airway strategy for micrognathia/Pierre Robin
• Avoid prolonged bag-mask and prefer early intubation + gastric decompression in known CDH
• Cover and support abdominal wall defects while preventing hypothermia
• Keep ABCs ahead of cosmetic or surgical curiosity
• Use antenatal information to brief the team

Bottom line: Anomalies change technique and precautions, not the need for oxygenated blood flow. Position the difficult airway, protect hypoplastic lungs from gut gas in CDH, and protect exposed bowel—then move the infant to the team that can provide definitive care.