Sensor Monitors Post-Operative Aortic Pressure

Much closer on the spot than usual
techniques: implantable pressure
sensors; © Picture Disk

In a new study, Dr. Sharif H. Ellozy and colleagues at Mount Sinai School of Medicine published their successful breakthrough showing their “continuing clinical experience with the use of a permanently implantable, ultrasound-activated remote pressure transducer.” This development of remote pressure sensing technology and the successful implantation and testing of the device raises the promise of eliminating the need for an invasive measurement technique.

Over a 22 month period, 21 patients underwent EVAR of a ballooning of the abdominal aorta (AAA) with implantation of a sensor exposed to the excluded aortic sac. At follow-up sac “pressures could be obtained at all visits for 15 of the 21 patients” by remote sensor. Other results included aneurysm shrinkage greater than 5mm in 50 percent of the patients and “no aneurysm enlargement was observed in any patient. Endovascular aneurysm repair results marked reduction of sac pressure in most patients. Patients with aneurysm shrinkage after EVAR have significantly lower mean pressure index: however, the absence of sac shrinkage does not imply persistent pressurization of the sac,” the surgeons at Mount Sinai reported.

The build up of pressure is a major concern following the EVAR surgery. Post-operative monitoring is crucial for patients, according to background information in the article. Between 40-50% of patients who undergo the procedure develop a serious complication in which the aneurysmal sac is not entirely isolated, leading to recurrent pressurization of the sac called endotension or endoleaks. In the past, the only way to measure pressure was with direct puncture of the aneurysm sac and most recently CT angiography scans.; Source: Mount Sinai Medical Center