One Hospital’s New Plan to Catch Questionable Cases of Child Abuse
Follow @GretchenMargFebruary 21, 2012, 12:11 pm ET
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Last year, as part of our ongoing investigation into the troubled state of death investigation in America, FRONTLINE, ProPublica and NPR took a closer look at what can be the most troubling and the most difficult cases — the suspicious deaths of young children.
We discovered a growing awareness in the medical community of a variety of diseases that can mimic abuse, including hereditary blood disorders, leukemia and vitamin K deficiency.
Nearly a year later, one doctor we spoke to — Dr. Michael Laposata, a pathologist and blood-clotting expert at Vanderbilt University who co-published a 2005 landmark study on diseases that can mimic abuse — is pioneering a new blood testing regimen to thoroughly rule out these types of disorders.
“If you’re lucky, most places … do the three routine tests: PT, PTT [both blood-clotting tests] and a platelet count, and that’s it,” Dr. Laposata told FRONTLINE in a phone interview. “It turns out most of the kids that have a bleeding problem have something other than that.”
“The problem is, you have to actually think about what [test] to order next,” he explains.
So Laposata and colleagues devised a system to make blood testing as foolproof as possible for doctors in cases of potential abuse: They created a tiered series of blood tests, known as a “Non-Accidental Injury Coagulation Panel,” which can identify underlying disorders that are more common in children. And they’ve learned how to do these tests with a small amount of blood, which is key when the patient is a baby.
“I think it’s the most comprehensive evaluation for a bleeding disorder that anybody has put forth to date,” Laposata said. The panel is expected to be introduced soon at Vanderbilt, and Dr. Laposata hopes to study its efficacy and to follow cases through the system over the years.
Because blood tests like these can only be performed on living patients whose blood is still flowing, a gap remains in diagnosing underlying conditions in cases where a child has died. But Dr. Laposata hopes that advances in genome testing could someday allow for hereditary disorders to be better identified.
He also told FRONTLINE that he hopes his coagulation panel “will spur more panels to evaluate bone injuries and skin changes that are also misdiagnosed as child abuse.”
Dr. Laposata was one of a number of doctors and other experts to offer testimony during the appeals process of Ernie Lopez, a Texas man convicted in 2003 of sexually assaulting 6-month-old Isis Vas. Isis, who had bruising and bleeding in both the brain and vagina, later died. Lopez was sentenced to 60 years in prison. After reviewing lab tests performed on Isis before hear death, Dr. Laposata concluded that they contained “clear abnormalities” and suggested that Vas suffered from a bleeding disorder known as disseminated intravascular coagulation (DIC). He gave an affidavit in the case in 2010.
Last month, the Texas Criminal Court of Appeals voided Ernie Lopez’s conviction, saying Lopez received ineffective counsel because his attorneys did not adequately challenge the prosecution’s medical evidence. Potter County District Attorney Randall Sims says he will retry Lopez.
“What’s very clear is that the major misdiagnosis out there with child abuse is missing it,” Dr. Laposata maintains, but he makes clear that there are serious consequences to misdiagnosing abuse. “Overdiagnosis may be even worse than underdiagnosis, because not only are we affecting the child, we are now affecting another person.”
Dig Deeper: Take a look at Dr. Laposata’s PowerPoint presentation that highlights the difficulty in diagnosing abuse cases. On one side is a photo of a child with bruises from a bleeding disorder; on the other, a photo of a child who was abused.
“I’ve been looking at patients with bleeding problems for years, more than two decades,” he said. “And if you show me the two children with the bruises on their legs, I couldn’t tell you that that one is the bleeding disorder. I’d have to do the blood test to find out.”
Photo: A photograph from Dr. Laposata's PowerPoint presentation: The child on the right has bruising from abuse, while the child on the left suffers from an underlying disorder.
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