Please select the eligibility criteria that correspond to the clinical trial below.
Title: High Flow Nasal Cannula Versus Nasal Intermittent Mandatory Ventilation for Respiratory Distress Syndrome: a Randomized, Controlled, Prospective Study
Brief Summary: The investigators hypothesize that while the extremely low birthweight (ELBW) infants (\<1000 g) may need NIMV for the treatment of RDS, larger infants or the smaller ones post extubation may enjoy the comfort benefits associated with HFNC while getting coparable respiratory support to NIMV.


Options:
A: Inclusion Criteria:

* All inborn VLBW infants (birthweight less than 1500 g and Gestational Age \< 32 wks) with signs of RDS, spontaneously breathing and only supported by N-CPAP, will be randomized within the first 2 hours of life to receive two different Non Invasive Ventilation (NIV) strategies.

Exclusion Criteria:

* Apneic or severely depressed newborns requiring invasive ventilation, within two hours from birth
* Newborns with genetic disease and/or with major congenital malformations
* Newborns for whom it was not obtained informed consent within two hours from birth
B: Inclusion Criteria:

1. Newborn infants with birth weight \>500 gm.
2. Gestational age \>24 completed weeks.
3. Intention to manage the infant with non-invasive respiratory support (i.e. no endotracheal tube), where either: 1) the infant is within the first 7 days of life and has never been intubated or has received less than 24 hours of total cumulative intubated respiratory support; 2)the infant is within the first 28 days of life, has been managed with intubated respiratory support for 24 hours or more and is a candidate for extubation followed by non-invasive respiratory support.
4. No known lethal congenital anomaly or genetic syndromes.
5. Signed parental informed consent.

Exclusion Criteria:

1. Considered non-viable by clinician (decision not to administer effective therapies)
2. Life-threatening congenital abnormalities including congenital heart disease (excluding patent ductus arteriosis)
3. Infants known to require surgical treatment
4. Abnormalities of the upper and lower airways
5. Neuromuscular disorders
6. Infants who are \>28 days old and continue to require mechanical ventilation with an endotracheal tube
C: Inclusion Criteria:

* preterm infants with RDS
* assigned to non invasive ventilation

Exclusion Criteria:

* preterm on endotracheal ventilation
* severe congenital pulmonary or cardiovascular malformation
D: Inclusion Criteria:

1. Gestational age between 24 to 34 and 6/7 weeks assessed by the obstetrical team from dating of last menstural period or ultrasound and weight \>1000 g for the initial treatment of RDS or \<35 weeks post extubation or for apnea of prematurity
2. Infants with RDS who will need NRS as initial therapy or after extubation and for apnea of prematurity, 3. written informed consent.

Exclusion Criteria:

1. Significant morbidity apart from RDS including: cardiac disease (not including patent ductus arteriosus \[PDA\]), congenital malformation, or if they had cardiovascular or respiratory instability because of sepsis, anemia or severe intraventricular hemorrhage (IVH),
2. Parents refuse consent.
3. Unavailability of suitable ventilator.

Answer: D