Three New Studies on the "Very Fast Breathing Machine" for Newborns: What They Show About Lungs, Hearts and Blood Gases

Li et al., El Amrousy et al. and Ali et al.: A Plain-Language Guide to Oscillation Ventilation Studies from 2026

Some sick newborns are helped to breathe by a machine that delivers tiny, very fast breaths, called high-frequency oscillation. Three new studies looked at it: one found a modest, uncertain hint of fewer lung problems in premature babies, one found both machine types improved circulation in full-term babies with high lung blood pressure, and one asked whether the machine's readings match blood tests. All are small, so they raise questions rather than settle them.

What the Breathing Machines Do and Why Doctors Debate Them

A ventilator is a machine that breathes for a baby through a soft tube in the windpipe. The usual kind, called conventional ventilation, gives a breath roughly every one to two seconds, like a slow, regular pump. High-frequency oscillation works more like a gentle, rapid vibration, delivering tiny puffs many times each second, which keeps the lungs held open while moving air in and out. Doctors have debated for decades whether this is better, because lungs of premature babies are fragile and a machine can itself cause damage.

The three studies described here come from different hospitals and are not a planned series. They do not contradict one another. They are best seen as three views of one technology: what it does to the lungs of premature babies, what it does to the heart and brain of full-term babies with a circulation problem, and whether the machine's own readings can be trusted. Because each study is small and from a single hospital, and the babies in them are very different, together they offer clues rather than a final answer.

A Short History of the Evidence

The story begins with two large studies published together in 2002. One of them followed 500 very small premature babies and reported a small benefit for their lungs, one that was statistically significant, from starting with the oscillator [1]. The other followed 797 babies born at 23 to 28 weeks and found almost no difference between the two machines: about 66 of every 100 babies on the oscillator and about 68 of every 100 on the usual ventilator died or had lasting lung disease at 36 weeks [2]. Later, researchers combined the individual results from 10 trials, covering 3,229 babies, and concluded the oscillator seems about as effective as conventional ventilation [3]. More recently, a 2025 combined analysis of 11 trials in premature babies who had received surfactant, a soap-like liquid that helps the lungs stay open, found fewer lung problems or deaths with the oscillator [4]. Evidence has therefore been mixed for a long time.

Two other developments matter here. Doctors agreed on an official definition of a severe, inflammatory lung problem in newborns, called neonatal acute respiratory distress syndrome (neonatal ARDS) [5], and a large Chinese study looked at how often it happens across 58 intensive care units, finding it in about 1.4 of every 100 admitted babies [6]. A study that compared babies on the two machines using existing records found no clear difference in deaths or lung scarring [7]. Separately, a lung blood-pressure problem in full-term newborns, called persistent pulmonary hypertension of the newborn (PPHN), has long been managed with gentle ventilation, inhaled nitric oxide and the medicine sildenafil [8]. Meanwhile, a setting called volume guarantee, which keeps each tiny breath at a chosen size, came into use, and early work suggested that the machine's carbon dioxide readings were only weakly linked to the baby's actual blood levels [9].

The First Study: Premature Babies with Severe Lung Inflammation

The first study was done at the Children's Hospital of Chongqing Medical University in China, which makes it a single-hospital study [10]. It enrolled 386 premature babies, born between about 25 and 35 weeks of pregnancy, who had neonatal ARDS and were already stable on a standard ventilator. By chance, 181 babies were assigned to the oscillator and 205 stayed on the standard ventilator. The main question was whether fewer babies would develop bronchopulmonary dysplasia, or BPD, a long-term lung scarring condition of prematurity.

The answer depended a little on how BPD was counted. Using an older definition from 2001, about 34 of every 100 babies on the oscillator developed BPD, compared with about 45 of every 100 on the standard ventilator. Using a newer definition from 2019 [11], the numbers were about 17 of every 100 versus about 25 of every 100 [10]. A later published correction fixed some figures in the original paper, and the numbers used here are the corrected ones [12].

Why This Result Is Encouraging but Not Final

The study leaves real uncertainty. With the newer definition, the statistical range of possible effects just reaches the point of "no difference", which means the finding is borderline. The study was also a little smaller than ideal for detecting some outcomes. Forty-four babies were switched to the other machine during the study under pre-set rules, which makes comparisons trickier [10].

Importantly, deaths were not lower with the oscillator. About 19 of every 100 babies on the oscillator died, compared with about 17 of every 100 on the standard ventilator, which is slightly higher but not clearly different. When deaths and BPD were counted together, there was no clear difference either. Other complications, such as bleeding in the brain, air leaks around the lungs, bowel problems and eye problems of prematurity, were also similar [10]. So the authors' conclusion, that early oscillation might be a promising way to prevent BPD, is a fair summary of what they found, but it is a conclusion drawn from one hospital, and larger studies across many hospitals are needed.

The Second Study: Full-Term Babies with High Lung Blood Pressure

Some full-term babies are born with PPHN, in which the small blood vessels in the lungs stay tight after birth, so blood cannot pick up oxygen easily and the right side of the heart works harder. It happens in about 2 of every 1,000 births [8]. The second study took place at Tanta University Hospitals, as a single-hospital study, and included 64 full-term babies with PPHN. All of them received a medicine called sildenafil to relax the lung blood vessels, and inhaled nitric oxide, another treatment for this condition, was not routinely available [13]. Half were placed on the oscillator and half on the standard ventilator, and doctors then performed heart ultrasounds on days 1, 3 and 7, along with head ultrasounds.

On both machines, babies improved in similar ways. The pressure in the lung blood vessels fell, the strained right side of the heart shrank back, and both sides of the heart pumped better. The amount of blood pumped by the heart each minute rose more in babies on the standard ventilator. A measure of resistance to blood flow in an artery of the brain fell only in babies on the oscillator. Bleeding in the brain was mild and similar in both groups [13].

These results need careful reading. The study was small, it tested many different measurements, and the report contains some internal inconsistencies, such as different numbers of deaths in the standard-ventilator group in different places. The finding that the standard ventilator raised the heart's output more, and that the oscillator lowered brain-artery resistance, should be seen as interesting clues. More blood pumped is not automatically better for a baby, and nobody measured long-term outcomes [13].

The Third Study: Can We Trust the Machine's Own Numbers?

The third study was done at King Abdulaziz Medical City in Riyadh, Saudi Arabia, and looked back at records of 60 very premature babies, born before 30 weeks, who were on an oscillator with volume guarantee [14]. The oscillator calculates how much carbon dioxide it thinks it is clearing. Carbon dioxide is the waste gas the baby breathes out, and doctors check how much builds up in the blood. The researchers compared nearly 600 machine readings with blood samples taken at the same time.

The machine's number swung widely, while the baby's blood level stayed close to the same value, about 50 on the standard measuring scale (mmHg). In other words, the screen did not track the blood test closely, which is a reminder of why blood tests remain important. The researchers then created a ratio dividing the machine's number by the blood level, which they called ventilatory efficiency. Babies were sorted into three equal groups. Among those with the lowest efficiency, 85 of every 100 died or had moderate-to-severe BPD, compared with 70 of every 100 in the middle group and 45 of every 100 in the highest group [14].

This sounds striking, but there are important cautions. The study looked back at records rather than following babies forward, it involved only one hospital, and the measure is a calculated one that has not been tested elsewhere. The babies with the lowest efficiency were also smaller and more premature, which can by itself raise the risk of lung problems. Interestingly, all six deaths were in the middle group, so the pattern across groups owes more to BPD than to deaths. Overall, the measure was only a modest predictor, so it is an idea worth testing and not a tool for decisions about individual babies [14].

What This Means for Families and What Remains to Be Answered

If your baby needs a ventilator, these studies do not mean one machine is right or wrong. The care team chooses the type of breathing support based on the baby's age, lungs, heart and response, and they watch blood tests, X-rays or ultrasounds closely. It is always reasonable to ask the team why a particular type of support was chosen, how they will know it is working, and what they will watch for. Our related articles on breathing support after the tube is removed and on lung blood pressure treatment may also be helpful.

Questions that remain open include three things. First, whether the small lung benefit from the first study holds up in larger studies across many hospitals [10]. Second, it would help to study full-term babies with PPHN in hospitals where nitric oxide is available, with longer follow-up [13]. Third, whether the ventilatory efficiency measure can really guide care, which needs forward-looking testing [14]. For now, the most honest summary is that oscillation remains one useful tool among several. Please talk with your baby's care team about anything in these studies that concerns you.

References

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  2. Johnson AH, Peacock JL, Greenough A, et al. High-frequency oscillatory ventilation for the prevention of chronic lung disease of prematurity. N Engl J Med. 2002;347(9):633-642. doi:10.1056/NEJMoa020432 ↩
  3. Cools F, Askie LM, Offringa M, et al. Elective high-frequency oscillatory versus conventional ventilation in preterm infants: a systematic review and meta-analysis of individual patients' data. Lancet. 2010;375(9731):2082-2091. doi:10.1016/S0140-6736(10)60278-460278-4) ↩
  4. Yu X, Tan Q, Li J, et al. Elective high frequency oscillatory ventilation versus conventional mechanical ventilation on the chronic lung disease or death in preterm infants administered surfactant: a systematic review and meta-analysis. J Perinatol. 2025;45(1):77-84. doi:10.1038/s41372-024-02185-x ↩
  5. De Luca D, van Kaam AH, Tingay DG, et al. The Montreux definition of neonatal ARDS: biological and clinical background behind the description of a new entity. Lancet Respir Med. 2017;5(8):657-666. doi:10.1016/S2213-2600(17)30214-X30214-X) ↩
  6. Chen L, Li J, Shi Y, et al. Clinical characteristics and outcomes in neonates with perinatal acute respiratory distress syndrome in China: a national, multicentre, cross-sectional study. eClinicalMedicine. 2023;55:101739. doi:10.1016/j.eclinm.2022.101739 ↩
  7. Liu K, Chen L, Xiong J, et al. HFOV vs CMV for neonates with moderate-to-severe perinatal onset acute respiratory distress syndrome (NARDS): a propensity score analysis. Eur J Pediatr. 2021;180(7):2155-2164. doi:10.1007/s00431-021-03953-z ↩
  8. Nair J, Lakshminrusimha S. Update on PPHN: mechanisms and treatment. Semin Perinatol. 2014;38(2):78-91. doi:10.1053/j.semperi.2013.11.004 ↩
  9. Belteki G, Morley CJ. High-frequency oscillatory ventilation with volume guarantee: a single-centre experience. Arch Dis Child Fetal Neonatal Ed. 2019;104(4):F384-F389. doi:10.1136/archdischild-2018-315490 ↩
  10. Li J, Liu K, Yang Q, et al. High-frequency oscillation vs mechanical ventilation for neonatal acute respiratory distress syndrome: a randomized clinical trial. JAMA Netw Open. 2026;9(3):e260268. doi:10.1001/jamanetworkopen.2026.0268 ↩
  11. Jensen EA, Dysart K, Gantz MG, et al. The diagnosis of bronchopulmonary dysplasia in very preterm infants: an evidence-based approach. Am J Respir Crit Care Med. 2019;200(6):751-759. doi:10.1164/rccm.201812-2348OC ↩
  12. Errors in Abstract, Results, Table 1, Table 2, Table 3, Discussion, and Visual Abstract. JAMA Netw Open. 2026;9(6):e2622801. doi:10.1001/jamanetworkopen.2026.22801 ↩
  13. El Amrousy D, Koura H, Abdou N, et al. Hemodynamic effects of high frequency oscillatory ventilation versus conventional mechanical ventilation in term neonates with persistent pulmonary hypertension: a single-center randomized trial. Ital J Pediatr. 2026;52(1):84. doi:10.1186/s13052-026-02272-z ↩
  14. Ali K, Alsenani M, Alshareedah S, et al. Ventilatory efficiency during high-frequency oscillatory ventilation with volume guarantee in preterm infants. Eur J Pediatr. 2026;185(7):527. doi:10.1007/s00431-026-07188-8 ↩