Can anyone tell me what this dip os and why its doing it?

[Card616]

I was told it was sinus tachycardia but the doctors couldnt see this dip in my readings at the hospital. What is going on? My heart will stop or feel like its squeezing for a second or two and then jolt back up to a fast beat. It was going at 130bpm when I did this screenshot. I know it's on an app and not an official reading but it shows this when I feel it. It happens approximately 5 to 10 times every 2 minutes and my heart rate wont slow down. Im already on beta blockers.

[2k2d]

So, you’re on beta blockers and your heart rate is constantly in the 130s? Has the doctor mentioned you might have IST (inappropriate sinus tachycardia)? And, are you being seen by an electrophysiologist?

Pauses could be start and stop of an SVT or just PACs or PVCs. Hard to say from looking at your images. Kardia makes a good handheld ecg device that records to a phone app if you need more data. Drs seem to like and trust it so will maybe they will listen then.

Hope you get it figured out soon!