Your teenager's health depends on timely, uninterrupted medical care. A sobering finding from the US Centers for Disease Control has just surfaced: after two decades of steady improvement, deaths from hypoplastic left heart syndrome (HLHS)—a serious congenital heart condition—began rising again after 2021.
HLHS is a rare but life-threatening condition where the left side of the heart doesn't develop properly. It affects about 3 in every 100 babies born with heart defects. Without staged surgical repairs (called the Norwood, Glenn, and Fontan procedures), it's incompatible with life. The good news: medical advances have been saving more lives. The concerning news: that progress may be reversing.
What the Research Shows
Researchers analysed 25 years of US death records—10,138 deaths from 1999 to 2024. From 1999 to 2021, mortality rates dropped steadily by about 2% each year. This reflected real progress: better surgical techniques, improved intensive care, and better management of these complex cases.
Then something changed. In 2020 and beyond, deaths stopped declining and began climbing. By 2024, deaths had risen to 358 cases—the highest in recent years. The researchers found another troubling pattern: boys and men consistently had higher mortality rates than girls and women throughout the entire study period, even though both sexes benefited from surgical advances.
What This Means for Singapore Families
Singapore's healthcare system is world-class, but this research carries three important messages for parents here.
First, continuity of care is critical. The post-pandemic rise in deaths suggests that disruptions to scheduled surgeries and follow-up appointments can have fatal consequences. If your child has been diagnosed with HLHS, protecting their surgical timeline is non-negotiable. Don't delay staged procedures, and maintain regular cardiology check-ups without gaps.
Second, sex differences matter. The study's finding that boys had persistently higher mortality rates deserves attention from parents and doctors alike. This doesn't mean boys can't do well—they absolutely can—but it suggests they may need more vigilant monitoring or tailored care strategies. If you have a son with HLHS, discuss with your cardiologist whether any sex-specific risk factors apply to his case.
Third, pandemic-era lessons apply beyond COVID-19. Any future disruption—whether health system strain, lockdowns, or travel restrictions—could again interrupt essential care. Build relationships with your medical team now, understand your child's surgical schedule clearly, and have contingency plans in place.
Three Things You Can Do Now
- Know your child's surgical roadmap. If your teen has HLHS, ask your cardiologist for a clear written timeline of any remaining procedures. Understand which surgeries are most urgent and what warning signs should prompt immediate hospital visits. Write it down and share it with teachers, relatives, and anyone involved in your child's care.
- Protect your appointment schedule fiercely. Don't reschedule routine cardiology visits unless absolutely necessary. These check-ups detect problems early. Set phone reminders well in advance and treat cardiology appointments with the same priority as school exams.
- Build a strong medical-family partnership. Meet regularly with your cardiologist to discuss your child's individual risks. Ask about sex-specific health considerations if you have a son. Create an open communication channel so concerns can be raised quickly without waiting for the next scheduled visit.
Medical advances have transformed HLHS from a death sentence into a manageable condition. But as this research shows, those gains are fragile—they depend on uninterrupted, high-quality care. Your role as a parent is to be the guardian of that continuity.