Please select the eligibility criteria that correspond to the clinical trial below.
Title: Timing of PDA Closure and Respiratory Outcome in Premature Infants
Brief Summary: The investigators propose the present study with the following aims:

* to determine whether early patent ductus arteriosus (PDA) treatment with ibuprofen treatment at the onset of clinical symptoms is superior to late ibuprofen treatment only when symptoms of a hemodynamically significant PDA are present in the evolution of bronchopulmonary dysplasia (BPD) defined as duration of supplemental oxygen exposure during the first 28 days
* to determine whether early PDA treatment with ibuprofen will be superior to late treatment with ibuprofen in efficacy of PDA closure, need for rescue therapy, need for PDA ligation and incidence of major complications of prematurity.

Hypothesis: Early pharmacologic closure of PDA with ibuprofen will improve respiratory course and reduce BPD as reflected by a reduction in duration of supplemental oxygen during the first 28 days of age vs. late pharmacologic treatment with ibuprofen.

Outcome variables: The primary outcome of this study is the number of days spent on supplemental oxygen by each infant during the first 28 days.

Other outcomes to be determined between groups include:

* Mortality
* Other respiratory variables: total days on supplemental oxygen, days on mechanical ventilation, oxygen dependence at 36 weeks post menstrual age, age at final extubation.
* Other respiratory complications: pneumothorax, pulmonary interstitial emphysema, need for high frequency ventilation, pulmonary hypertension
* Efficacy of PDA closure: number of courses of medication required, need for ligation
* Other neonatal complications: intraventricular hemorrhage (IVH), periventricular leukomalacia (PVL), retinopathy of prematurity (ROP), necrotizing enterocolitis (NEC), intestinal perforation, sepsis, renal dysfunction (oliguria, elevated creatinine)
* Time to achieving full enteral feedings, time to regain birth weight, weight at discharge.
* Length of hospital stay


Options:
A: Inclusion Criteria:

This will be a prospective randomized, multi-center, controlled trial that will enroll infants delivered between 23 \& 0/7 - 27 \& 6/7 weeks gestation:

1. infants must be between 5-14 days old (if delivered between 23 and 0/7 - 25 and 6/7 weeks) or 7-14 days old (if delivered between 26 \& 0/7 - 27 \& 6/7 weeks) and
2. have a "moderate size PDA" (defined as a PDA on echocardiogram that has at least one of the following criteria: internal ductus diameter ≥1.5 mm/kg (or PDA:LPA ratio ≥0.5), ductus flow velocity ≤2.5 m/s or mean pressure gradient across the ductus \<8 mm, LA/Ao ratio ≥1.5, left pulmonary artery diastolic (or mean) flow velocity \>0.2 (or \>0.42) m/sec, respectively, and/or reversed diastolic flow in the descending aorta)(13, 68, 69) and
3. are receiving respiratory support consisting of either mechanical ventilation, nasal CPAP, SiPAP, or nasal cannula flow ≥2 L/min.

   -

   Exclusion Criteria:

   prior treatment with indomethacin, ibuprofen, or acetaminophen, contraindications for the use of indomethacin, ibuprofen, or acetaminophen (these include: hydrocortisone administration within 24 hrs, urine output \< 1 ml/kg/h during the preceding 8 h, serum creatinine level \>1.6 mg/dl, platelet count \<50, 000/mm3, abnormal coagulation studies, or total bilirubin concentration (in mg/dL) \> 8 x weight (in kg)), chromosomal anomalies, congenital or acquired gastrointestinal anomalies, prior episode of necrotizing enterocolitis or intestinal perforation.

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B: Inclusion Criteria:

* Inborn patients at JHS hospitals (admitted to the NICU at JMH within the first 72 hrs of age
* BW 500-1250 grams
* 23-32 wks gestational age
* \> 1d but \< 14d of age.

Exclusion Criteria:

* Major congenital malformations
* Proven sepsis (positive blood culture)
* Contraindications to the use of Ibuprofen or Indomethacin
* Terminal condition, not expected to survive beyond 48 h
* Infants born excessively SGA(3 S.D. below the mean for GA)
* Infants with initial PDA presentation that is hemodynamically significant
C: Inclusion Criteria:

1. gestational age of 30 weeks or less or birth weight of 1250 g or less
2. born in Samsung Medical Center
3. confirmed to have hemodynamically significant patent ductus arteriosus (PDA) during day of life (DOL) 5 to 14
4. Definition of hemodynamically significant PDA: ductal size ≥ 1.5 mm with left-to-right shunt (or bidirectional shunt with dominant left-to-right blood flow) on the initial echocardiography plus at least one of clinical criteria.

   * Clinical criteria

     * Respiratory signs, including tachypnea, chest retraction, increased respiratory support, unable to wean respiratory support
     * Physical signs, including a murmur, hyperdynamic precordium or bounding pulses
     * Blood pressure problems, including decreased mean or diastolic pressure or increased pulse pressure
     * Signs of congestive heart failure, including cardiomegaly, hepatomegaly or pulmonary congestion

Exclusion Criteria:

* Mortality within the first 48 hours of life
* Ductal size \< 1.5 mm on the initial echocardiography
* Right-to-left shunt or bidirectional shunting with dominant right-to-left shunt through PDA
* congenital anomaly
* bilateral intraventricular hemorrhage of grade 4
* contraindication of ibuprofen (bleeding diasthesis, platelet count 10,000/mm3 or less, serum creatinine 2.0 mg/dL or greater, necrotizing enterocolitis stage 2 or greater
D: Inclusion Criteria:

* Gestational less than 28 weeks
* Postnatal age less than 12 hours

Answer: B