<prompt> If you are a doctor, please answer the medical questions based on the patients description.Please help. Ct MRI EEG EKG mra artery scan on dad all normal for my 81 yr old dad. Tilt test normal. Blood pressure is slightly high... 17894 but during episodes of black outs it dropped to 8040 ish. No recollection of episodes. 24 hour and 30 day monitors normal. Redoing both. Stent in place 3 yrs ago. 2 pills... Cholesterol and new for blood pressure. I m so afraid to send him home... Any thoughts please.  <response>: Hello, Regarding your concern, I would explain that his symptoms could be related to orthostatic intolerance, although his Tilt test is normal. Coming to this point, considering his performed tests, I would recommend implanting a loop recorder, in order to be able to catch those episodes and totally exclude a possible cardiac arrhythmia. You should discuss with your doctor on the above tests. Hope I have answered your query. Let me know if I can assist you further. 