May 3, 2012
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May 3, 2012
Hopkins researchers have recently published a study confirming their hypothesis that levels of blood loss vary in children undergoing corrective spine surgery based on the type of underlying spine deformity condition. The results of this study are helpful to pediatric surgeons and open up more opportunities for spine surgery research. Years ago, Paul Sponseller, chief of pediatric orthopedics at Hopkins Children's Center and Dolores Njoku, a pediatric anesthesiologist, created a spine database. Despite a small sample of patients, they were able to deduce a connection between patient diagnosis and blood loss during surgery. The new study, published online in Spine, is part of an expansion of these older findings into a new database. Through analysis by Amit Jain, a medical student, the researchers found the same underlying link as with the prior database. The study is unique for its "multidisciplinary approach utilizing expertise in surgery and anesthesiology," Dr. Njoku wrote in an email to The News-Letter. The study included data from 617 corrective spine surgeries of 37 different diagnoses performed on children between 2001 and 2011 at Hopkins. In order to sort the data, diagnosis types were classified into five groups: idiopathic scoliosis (the most common scoliosis without a known cause), Scheuermann's kyphosis (an elevated roundback in upper spine), cerebral palsy (a set of brain and nervous system disorders), additional neuromuscular disorders (including dystrophies, atrophies or trauma injuries), and genetic or syndromic disorders. There were a number of variable elements to the procedures that required normalization during analysis. To calculate the normalized blood loss (NBL), Sponseller and Njoku divided the amount of blood lost by the number of spine levels fused during surgery and the patient's weight. These calculations indicated that patients with cerebral palsy suffered an average blood loss of 3.2 millimeters per kilogram body weight, the highest amount among all of the diagnosis groups. The amount for patients with neuromuscular conditions and genetic syndromes stood at the middle while children with Scheuermann's disease or idiopathic scoliosis ranked at the lowest loss overall. According to the researchers, the heightened risk for those with neuromuscular or genetic conditions is related to the patients' changed blood-clotting capabilities and their low platelet count, among other reasons. Children with idiopathic scoliosis face the lowest risk of blood loss during surgery. "They are the healthiest, best nourished (best chance of optimal clotting mechanics)" Sponseller wrote in an email to The News-Letter. "However, interestingly, the standard preop lab measurements of clotting function are normal in all of the conditions studied. The reason behind the greatest loss in patients with cerebral palsy is still a mystery, but invites further research. Blood loss during surgery is best avoided for a number of reasons. "The negative effects of blood loss are increased stress on the heart, changes in blood chemistry and drug levels, and exposure to infectious risk from infusions," Dr. Sponseller said. This study is targeted at helping surgeons and anesthesiologists better anticipate any surgical complications that could lead to longer hospital stays or poor recovery. "The biggest benefit is that the anesthesiologists and surgeons that care for these patients can be more prepared," Njoku wrote. "The Anesthesiologist gives blood and fluids to the patient in addition to anesthesia to keep the patient asleep. The surgeons may then develop innovative instruments or techniques that may decrease blood loss." Sponseller adds that blood loss may be reduced by anti-fibrinolytics, inhibitors to fibrin breakdown in blood clots, and an earlier provision of clotting factors. This study is an entry into discovering what benefits may be reaped from understanding the link between blood loss and diagnosis in spine surgery. "It documents the problem to serve as an impetus for research into the reasons why the difference exists," Sponseller wrote. "We hope to ignite a spark of interest, which stimulates others with knowledge of coagulation to find the reason . . . For a fairly uniform surgery, hemostatic function differs by disease in ways which would not have been predicted. This is a topic for further study and an opportunity for improvement."
As an increasing number of women choose to delay motherhood until a more advanced age, the perception that assisted reproductive technologies will always be successful has also become more popular. Researchers at Yale University have studied this issue, concluding that education about these technologies as well as about actions that can be taken earlier on in a woman’s life is crucial in the modern medical world.
When a patient suffering from an acute lung injury enters the intensive care unit, the intensity of the injury is not the only factor that may affect their mortality. Researchers at Hopkins School of Medicine have discovered that using the optimal breath size and pressure settings on mechanical ventilators is essential to the long-term health of these patients.
Almost a decade has passed since a new blood group protein has been identified, but an international team of researchers has recently discovered two transport proteins on red blood cells. Labeled as ABCB6 and ABCG2, they are responsible for the rare Langereis and Junior blood types, respectively, and bring the total number of identified blood type proteins to 32.
One of the harshest realities of global warming is its potential to feed into itself. A recent study by researchers at the Lawrence Berkeley National Laboratory in California suggests that melting permafrost may affect the atmospheric greenhouse gas concentration.
Who would have thought that the same video games played in the common room at college could have positive effects on the health of patients battling critical illnesses? A recent study conducted by Hopkins researchers suggests that these interactive video games may favorably complement physical therapy for patients in intensive care units (ICU).
A study conducted by cardiologists at Hopkins shows that patients with implanted cardiac devices are able to undergo magnetic resonance image (MRI) examination under the proper precautions and monitoring.
Scientists at the University of California, Los Angeles (UCLA) have engineered a mouse model for autism that has pointed to a new understanding of the disorder and possible ways to evaluate new treatments.
Researchers at the University of California, Los Angeles, have located the H1N1 virus in animals by conducting nasal swab tests and taking blood samples from domestic pigs in the Cameroon region of Africa.