<s>[INST] 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... 178/94 but during episodes of black outs it dropped to 80/40 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. [/INST] 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.  </s>