In a London hospital, researchers have quietly redrawn the boundary between intervention and harm, using focused sound waves to treat a dangerous twin pregnancy condition without ever entering the womb. Twin-to-twin transfusion syndrome, which threatens hundreds of UK pregnancies each year through dangerously uneven blood flow between identical twins sharing a placenta, has long demanded invasive surgery as its answer. This world-first trial suggests that medicine may be approaching a gentler reckoning with risk — one where the body is healed not by being opened, but by being listened to, at f
Ultrasound breakthrough offers hope for rare twin pregnancy condition
Twin-to-twin transfusion syndrome endangers both babies through unbalanced blood flow; the procedure prevented potential loss of life and serious complications for the treated twins.
Every day I still count my blessings
Mark
Why does this condition happen in the first place? Is it something the mother did, or is it just random?
Mimi
It's purely random—a consequence of how identical twins develop when they share a placenta. The blood vessels in the placenta connect the two babies' circulations, and sometimes the connections are unbalanced. One twin ends up as a net receiver, the other a net giver. It's not preventable, not the mother's fault.
Mark
And the old treatment—inserting a needle into the womb—how risky is that?
Mimi
It works, and doctors have refined it over years, but it's still surgery. There's infection risk, miscarriage risk, the physical trauma of the procedure itself. For a pregnant woman already terrified about her babies, the idea of a needle going through her abdomen into the womb is understandably frightening.
Mark
So this ultrasound method—it's just sound waves. How does heat from sound actually seal a blood vessel?
Mimi
The focused ultrasound generates intense heat at a very precise point. When that heat reaches a blood vessel, it essentially cauterizes it—seals it shut without cutting. It's like using a laser, but from outside the body, without needing to insert anything.
Mark
The trial results show half the women needed further treatment. That sounds like it didn't fully work.
Mimi
It's more nuanced than that. The procedure itself worked—it sealed the vessels. But pregnancy is long and complex. Some women developed other complications that required additional intervention. The key is that the ultrasound treatment addressed the core problem without surgery, and the babies survived and were born healthy.
Mark
What happens now? Can women get this treatment?
Mimi
Not yet, not widely. This was a first trial—proof of concept. Before hospitals can offer it as standard care, researchers need to run larger studies with more women, to confirm the results hold up and to understand the full range of outcomes. It's promising, but medicine doesn't move fast on hope alone.
Il Polso
- Two lives hang in the balance each time TTTS strikes: one twin drowning in excess blood, the other starving, both in danger before they have drawn a single breath outside the womb.
- For decades, the only recourse was a needle or laser passed through the mother's abdomen — effective, but carrying the full weight and risk of surgical intrusion into pregnancy.
- Researchers at Queen Charlotte's and Chelsea Hospital in London tested a focused high-powered ultrasound beam capable of sealing placental blood vessels as narrow as two millimeters — no incision, no entry, no reported side effects.
- The trial achieved a 90% vessel-blocking success rate across ten women, and twelve of twenty twin babies were born alive, with results published in a leading obstetrics journal.
- Experts call the findings very promising, but caution that larger studies must confirm the results before this non-invasive approach can be offered beyond the trial setting.
In a London hospital, researchers have quietly redrawn the boundary between intervention and harm, using focused sound waves to treat a dangerous twin pregnancy condition without ever entering the womb. Twin-to-twin transfusion syndrome, which threatens hundreds of UK pregnancies each year through dangerously uneven blood flow between identical twins sharing a placenta, has long demanded invasive surgery as its answer. This world-first trial suggests that medicine may be approaching a gentler reckoning with risk — one where the body is healed not by being opened, but by being listened to, at frequency.
Nancy and Margo were four years old when their mother Brioney first spoke about what had nearly taken them before they were born. In a few weeks they would start primary school — healthy, energetic, unremarkable in the best possible way. That ordinariness had been far from guaranteed.
The condition that threatened them, twin-to-twin transfusion syndrome, occurs when identical twins share a placenta and blood flow between them becomes dangerously uneven. One twin receives too much, the other too little. Both are at risk. In the UK, the syndrome affects three to four hundred pregnancies each year.
For decades, treatment has meant surgery — a needle through the mother's abdomen to drain fluid or a laser to seal the offending vessels. It works, but it carries the full burden of invasive procedure. What Brioney underwent was something else entirely. Researchers at Queen Charlotte's and Chelsea Hospital in London had developed a method using high-powered focused ultrasound — not the gentle imaging kind, but a concentrated beam of sound waves that generates enough heat to seal blood vessels without cutting, without entering the womb at all.
Brioney was among ten women enrolled in a world-first trial. The procedure took about twenty minutes. She lay flat. It was quick and painless. Within weeks, scans showed the blood flow between her twins had rebalanced. Margo, who had been starved of fluid, was recovering. Nancy's strained heart had eased. Both girls were born at nearly thirty-four weeks, small but healthy and thriving.
The trial, published in the American Journal of Obstetrics & Gynecology, reported a 90% success rate in blocking problematic vessels, with no unwanted side effects. Half the women required further treatment, and twelve of the twenty twin babies were born alive. Professor Christoph Lees of Imperial College Healthcare NHS Trust called the approach very promising, noting that confirmed results in larger studies could spare many women from invasive surgery.
"We were in a very dire situation and I don't forget that," Brioney said. "Every day I still count my blessings." Before this method can be offered widely, larger clinical trials must follow. But for families facing this diagnosis, the possibility of a non-invasive path now exists where it did not before.
Nancy and Margo were four years old when their mother Brioney Garrett first told their story. In a few weeks, they would start primary school—two energetic, healthy girls who might not have survived their time in the womb. Their lives were saved by a procedure that did not yet have a name in common use, one that their mother described as quick and painless, lasting about twenty minutes while she lay flat on an examination table.
The condition that threatened them is called twin-to-twin transfusion syndrome, or TTTS. It occurs in identical twins who share a placenta, and it happens because blood flow between them becomes dangerously uneven. One twin receives too much blood and swells with excess fluid around the heart and organs. The other twin receives too little, starving in amniotic fluid, their organs stressed and undersized. Both are at risk. In the United Kingdom, the condition affects between three hundred and four hundred pregnancies each year—roughly one in every ten or fifteen cases of identical twins sharing a placenta.
For decades, the standard treatment has been invasive. Doctors insert a needle through the mother's abdomen into the womb, either to drain fluid from around the larger twin or to use a laser to seal the blood vessels causing the imbalance. It works, but it carries the weight of surgery: risk, recovery, the knowledge of a needle passing through the body to reach the babies inside.
The procedure Brioney underwent was different. Researchers at Queen Charlotte's and Chelsea Hospital in London had developed a method using high-powered ultrasound—not the gentle imaging ultrasound used in routine pregnancy scans, but a focused beam of sound waves capable of generating heat. That heat, concentrated on blood vessels no wider than two millimeters, could seal them without cutting, without entering the womb. The machine fired these waves at the problematic vessels in the placenta. The procedure blocked blood flow in ninety percent of the vessels treated. There were no unwanted side effects.
Brioney was part of a world-first trial involving ten pregnant women from across the United Kingdom and Europe. Within weeks of her treatment, scans showed the blood flow between Nancy and Margo had rebalanced. Margo, the smaller twin who had been starved of fluid, was in a much better position. Nancy's heart, which had been straining under the burden of excess blood, had eased. When the twins were born at nearly thirty-four weeks, both were healthy. Nancy weighed three pounds seven ounces. Margo weighed three pounds three ounces—smaller than Brioney had feared, but viable, thriving.
The trial results, published in the American Journal of Obstetrics & Gynecology, showed that half of the ten women required further treatment during their pregnancies, and twelve of the twenty twin babies survived the procedure and were born alive. Researchers called the findings extremely exciting. Professor Christoph Lees, head of fetal medicine at Imperial College Healthcare NHS Trust, said the work was very promising. If larger studies confirmed the results, he noted, it could offer hope to women who might otherwise face invasive surgery.
Brioney spoke of her daughters as miracle twins. "We were in a very dire situation and I don't forget that," she said. "It stays with me always how things could have been. Every day I still count my blessings." She described her girls as funny, smart, energetic—children who fit right in with their age group, unremarkable in the best possible way. The procedure had given them that ordinariness, that chance.
Before this ultrasound method can be offered widely to pregnant women carrying twins with TTTS, larger clinical studies will be needed. The evidence from this first trial is compelling, but medicine moves carefully. Still, for families facing this diagnosis, the possibility of a non-invasive alternative to needle and laser represents something that did not exist before: a gentler path through a life-threatening condition.
Citazioni salienti
If this could work in a fully-fledged study, it could give hope to a lot of women who otherwise might have to have quite invasive treatment— Professor Christoph Lees, head of fetal medicine at Imperial College Healthcare NHS Trust
Any procedure that is non-invasive and can potentially identify TTTS earlier and improve outcomes for our families with this life-threatening condition could be a turning point— Helen Peck, head of healthcare engagement and research at Twins Trust
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