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NCT04697693
In the Investigator's ongoing studies of Posttraumatic Stress Disorder (PTSD) in older adults, it has been found that older adults with PTSD frequently meet the criteria for comorbid Major Depressive Disorder (MDD). Moreover, relative to trauma-exposed healthy controls (TEHCs), elders with PTSD manifest executive function deficits, fatigability, and mobility and physical function deficits that are consistent with what the investigator has observed in depressed older adults. Yet, the investigator has found that very few older adults with combined PTSD/MDD have received appropriate antidepressant treatment for their condition. These findings give rise to the questions of (1) how effective is antidepressant treatment for depressive symptoms in the context of PTSD/MDD and (2) are cognitive and physical function deficits in PTSD/MDD patients reversible with effective antidepressant treatment?
NCT01333943
Currently, the regional anesthetic standard of care for total knee replacement surgery is combined spinal/epidural, with or without a femoral nerve block, or FNB. Lasting approximately 18 hours, the FNB works by numbing the femoral nerve (and its branches), which is the major nerve controlling the knee joint. The femoral nerve also provides movement and sensation. While this regional anesthetic technique offers significant postoperative pain relief, it is possible that it may cause muscle weakness and increase patients' recovery time. Hence there is a need for an alternative technique, one that may help minimize postoperative pain as effectively as the FNB, while not causing weakness of the quadriceps muscle. The saphenous nerve, a branch of the femoral nerve, provides sensation to the knee. Thus it is hypothesized that by "blocking" or anesthetizing the saphenous nerve with local anesthetic closer to where it branches off, the area around and below the knee will feel numb. Yet unlike with the FNB, the quadriceps muscle itself will still be able to function. Patients will be randomized to receive FNB or saphenous nerve block. Quadriceps strength will be tested using a dynamometer before surgery (baseline), 6-8 hours following anesthesia administration, and on postoperative days 1 and 2. It is hypothesized that patients who receive FNB will experience a 50% decrease in quadriceps strength compared to baseline.