Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services for:
Severe or rapidly worsening difficulty breathing
Chest pressure or pain, especially if it spreads to the arm, back, neck, or jaw
Fainting, severe confusion, or difficulty waking
Blue or grey lips or skin
A fast heartbeat accompanied by collapse or severe weakness
These symptoms can have several causes and should not be assumed to be MAT.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice for a new, sustained racing or irregular heartbeat, particularly with breathlessness, dizziness, or worsening exercise tolerance.
The rhythm may need an ECG, and any underlying breathing or heart problem may need treatment.
3
Does any of this apply?
Book an appointment
Arrange routine follow-up if symptoms are stable but episodes keep returning, medicines are causing concerns, or recovery from the triggering illness is slower than expected.
Routine visits can also review oxygen levels, blood minerals, and control of existing heart or lung conditions.
Every sign above is quoted from the sofidex article on Multifocal atrial tachycardia. If you are not sure, err upward — it is always reasonable to be checked.