The researchers from San Donato General Hospital in Milan faced the challenge of restoring adequate blood flow in a 73-year-old woman who presented with shortness of breath and pulmonary hypertension. The patient's medical history included endometrioid ovarian cancer, prior stroke, and class III heart disease. Cardiac ultrasound scans of the patient revealed a sinus venosus ASD that required surgical intervention.
Due to the complexity of the patient's cardiovascular anatomy and pathology, it was critical for the surgical team to understand the precise 3D spatial relationships among all relevant anatomical structures before beginning surgery, first author Dr. Gianfranco Butera, PhD, told AuntMinnieEurope.com.
To meet this need, Butera and colleagues generated a virtual 3D model of the patient's heart using computer software. Next, they used an AR headset (HoloLens, Microsoft) to evaluate the hologram and plan their surgical approach (JACC: Cardiovasc Interv, 15 May 2019).
After studying the individually tailored AR model, the group created a translucent, flexible 3D-printed model of the heart based on conebeam CT scans of the patient. The researchers used the 3D-printed model to test the feasibility of their surgical plan -- in particular, to confirm that the procedure would restore healthy venous blood flow -- after which they performed the operation on the patient. Postoperative ultrasound scans, as well as 3D AR models based on postoperative CT scans, showed significant improvement in patient health.
"Colleagues willing to develop a program about transcatheter treatment of sinus venosus ASD could take advantage of our 3D approach in order to plan successful procedures," Butera said. "The possibility to avoid open heart surgery, cardiac arrest, and extracorporeal circulation is a great advantage for the patients in terms of morbidity, length of hospital stay, [and] pain and discomfort."
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