Throat exhalation noise

Patient: Hi, I am a 40 yr old male. Non smoker. fit. slim. swim a km or more a day. eat organic. drink v little alcohol.for last 6 years have a squeak from deep in throat on exhalation. Almost inaudible, but there, and slightly more so now. Just noticed this year that the squeak accompanies heart beat, especially pronounced with elevated heart beat. I am VERY heavy snorer (small jaw/narrow throat) btw but cleared of apnea etc with a sleep test several years back.Wonder what this may be?Thanks much!C

Symptoms: Whistle from throat on exhalation