When a child is diagnosed with hypoxic-ischemic encephalopathy (HIE) or another serious birth injury, families are often left without clear answers about what actually happened during labor.

Medical records may use reassuring or vague language, or describe the outcome as an “unavoidable complication.” But those summaries don’t always tell the full story.

To better understand what occurred, it is often necessary to look more closely at the underlying data, especially the fetal heart monitoring strips. These records show how a baby responded to labor in real time. In many cases, they can reveal whether warning signs were present and how they were handled.

When these strips are carefully reviewed, a pattern sometimes emerges involving three important factors: Pitocin use, uterine tachysystole, and changes in a baby’s ability to tolerate labor, sometimes referred to as “fetal reserve.” 

Pitocin and Tachysystole: When Contractions Become Too Frequent

Pitocin is a commonly used medication that stimulates uterine contractions to induce or speed up labor. When used appropriately, it can be safe and effective. 

However, Pitocin must be carefully monitored and adjusted. In some situations, contractions can become too frequent, a condition known as uterine tachysystole, defined as more than five contractions in ten minutes, averaged over a 30-minute period.

During any contraction, blood flow through the placenta temporarily decreases. In a typical labor, there is enough time between contractions for oxygen levels to recover.

With tachysystole, that recovery window shortens.

One way to think about it is this: instead of having time to take steady breaths between contractions, the baby has less and less opportunity to recover.

Importantly, tachysystole alone does not mean an injury has occurred. What matters most is how the baby responds and how the medical team reacts to those changes.

Fetal Reserve: How Babies Tolerate the Stress of Labor

Many babies enter labor with what clinicians often describe as “fetal reserve” , their ability to tolerate the temporary drops in oxygen that occur during normal contractions.

But that reserve is not unlimited.

If contractions happen too frequently, or if a baby is already vulnerable, that reserve can begin to diminish over time. When this happens, the baby may no longer recover as effectively between contractions.

These changes are often visible on the fetal heart monitor, including:

• Reduced variability (less beat-to-beat fluctuation)
• Late decelerations (heart rate drops occurring after contractions)
• Prolonged or worsening decelerations
• Unusual baseline changes (sustained increases or decreases in heart rate)

Research has shown that frequent contractions are associated with a higher likelihood of concerning fetal heart rate patterns. Clinically, the key question is not just whether contractions are frequent, but whether the tracing shows signs that the baby is struggling to recover.

What Should Happen When Warning Signs Appear

When tachysystole occurs, especially alongside concerning changes in the fetal heart tracing, medical teams are expected to take steps to reduce stress on the baby. These may include:

• Reducing or stopping Pitocin
• Repositioning the mother
• Administering IV fluids
• Providing supplemental oxygen when appropriate
• Using medication to decrease contraction frequency if needed
• Considering whether delivery should be expedited

These are often referred to as intrauterine resuscitative measures.

In many birth injury cases, the central question is not whether a complication occurred, but whether these warning signs were recognized and addressed in a timely and appropriate way.

Looking at the Full Picture in HIE Cases

Tachysystole alone does not prove that an injury occurred, or that care was inappropriate.

However, when frequent contractions are combined with worsening fetal heart rate patterns and there is a delay in recognizing or responding to those changes, those details become critically important.

Understanding what happened in these cases requires looking closely at:

• The timing of events during labor
• The patterns in the fetal heart tracing
• The actions taken in response to those patterns

For families searching for answers, these records can help clarify whether labor followed an expected course, or whether earlier intervention might have made a difference.

Have Questions About Your Baby’s Birth?

If your child was diagnosed with HIE or another birth injury and you are unsure what happened during labor, you are not alone.

A careful review of the fetal monitoring strips and medical records, often with the help of independent medical experts, can provide important answers.

If you have questions about what your baby’s monitoring showed, our team can help review those records and walk you through what they may mean.

Reference

Zullo, F., Licitra, B., Raghuraman, N., Cahill, A. G., Roberts, A. W., Roth, S., Di Mascio, D., Giancotti, A., Rizzo, G., Cagino, A. K., Mendez-Figueroa, H., Sciscione, A. C., & Chauhan, S. P. (2026). Uterine Tachysystole and Associated Outcomes: A Systematic Review and Meta-analysis. O&G Open, 3(1), 1-10. https://digitalcommons.library.tmc.edu/uthmed_docs/3868

Disclaimer

The information provided in this article is for educational and informational purposes only and does not constitute legal or medical advice. Reading this blog post or submitting an inquiry to Liro Willer Law does not establish an attorney-client relationship. Medical standards, protocols, and legal strategies vary based on the unique facts of each case and specific state jurisdictions. If you suspect your child suffered a birth injury, you should consult with a qualified medical professional immediately regarding clinical care, and contact an experienced birth injury attorney to evaluate your potential legal options.