# A newborn delivered via cesarean section at 38 weeks gestation is experiencing respiratory distress. Which assessment finding would be most characteristic of transient tachypnea of the newborn (TTN)?

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=543256  
> language: ko  
> subject: Maternal Newborn Health

## 문제

A newborn delivered via cesarean section at 38 weeks gestation is experiencing respiratory distress. Which assessment finding would be most characteristic of transient tachypnea of the newborn (TTN)?

## 보기

1. Expiratory grunting and nasal flaring with cyanosis
2. Asymmetrical chest movement with diminished breath sounds
3. Tachypnea with mild retractions and good air exchange **✔ 정답**
4. Apneic episodes alternating with rapid breathing

**정답: 3**

## 해설

TTN is characterized by tachypnea with mild retractions but good air exchange, distinguishing it from more severe respiratory conditions like RDS or pneumothorax.

## 심화 해설

Clinical Judgment
This question requires diagnostic reasoning. The given scenario (cesarean delivery without labor, full-term infant, respiratory distress) shows typical risk factors for TTN (Transient Tachypnea of the Newborn). The key is knowing the characteristic clinical presentation of TTN and differentiating it from other more serious respiratory conditions (e.g., respiratory distress syndrome, pneumothorax, sepsis). TTN is a self-limiting disease, and while tachypnea is the main symptom due to delayed lung fluid absorption, the mechanical function of the lungs (air exchange) is relatively well preserved. Therefore, "tachypnea and mild retractions, **good air exchange**" is the key cue.

Memory Tip:
A mnemonic to remember TTN: "**T**ransient **T**achypnea = **T**emporary **T**rouble, **N**ot **N**eeded aggressive support". It means that because it is temporary tachypnea, air exchange is fine, and aggressive respiratory support is not needed.

KR vs US:
In Korea, the diagnosis 'transient tachypnea of the newborn' is widely used, and management principles are similar. However, in the US NGN, questions often focus on the 'Recognize Cues' and 'Analyze Cues' stages of the CJMM (Clinical Judgment Measurement Model), asking which of the given cues is most characteristic of a specific condition. The 'good air exchange' cue in TTN is a key point that clearly contrasts with the 'poor air exchange' of RDS (respiratory distress syndrome).

## 임상 시나리오

Clinical Practice Guide
Nursing care for newborns with suspected TTN: 1) Continuously monitor vital signs, especially respiratory rate and oxygen saturation (target 90-95%). 2) Provide supplemental oxygen (nasal cannula or head hood) if needed. 3) Start or maintain intravenous fluid therapy to maintain glucose and electrolyte balance. 4) Maintain a minimal stimulation environment to reduce work of breathing. 5) Start feeding slowly while observing respiratory status (aspiration risk).
Caution:
In SATA (Select All That Apply) questions, it is easy to confuse TTN and RDS. TTN is usually associated with full-term or late preterm infants, cesarean section (especially without labor), and symptoms appear immediately after birth or within a few hours. RDS mainly occurs in preterm infants, and due to surfactant deficiency, respiratory distress worsens over time. "Expiratory grunting" is a more typical sign of RDS.

## 핵심 개념

- **Transient Tachypnea of the Newborn** — Transient tachypnea of the newborn. A self-limiting respiratory distress that occurs due to delayed absorption of fetal lung fluid, often from cesarean section delivery without labor, and usually improves within 72 hours.
- **Respiratory Distress Syndrome** — Respiratory distress syndrome. Primarily occurs in premature infants due to a deficiency of pulmonary surfactant, presenting with progressive respiratory failure characterized by grunting, retractions, and cyanosis during expiration.
- **Cesarean Section (C-section)** — Cesarean section. A surgical procedure to deliver a fetus through incisions in the abdomen and uterus. 'Elective' cesarean section is a major risk factor for TTN.
- **Retractions** — Retraction. A symptom that appears when using accessory muscles during breathing difficulty, where the skin sinks in at areas such as intercostal, subcostal, and suprasternal regions. In TTN, mild retraction is usually seen.
- **Air Exchange** — Air exchange. It refers to the efficiency of gas exchange in the lungs, and can be assessed by the quality and loudness of breath sounds during auscultation, as well as oxygen saturation. In TTN, air exchange is relatively well maintained (good air exchange) even if tachypnea is present.

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