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Only Holter or Event Monitor could explain...It could be an exacerbation of normal respiratory variation?
Anaemia / Anxiety / Alcohol / Tobacco (smoking) / Caffeine (too much tea, coffee, cola) / Fever / Pain / Stress / Thyroid
/ Vitamin D, calcium, magnesium
/ Medicines like Phenylephrine
used for ‘cold’; Salbutamol
used for asthma and so on / may be responsible.... / Illicit ‘drugs’ like Amphetamine
are notorious to cause abnormal beats / At times, abnormal nerve paths in the heart (bypass tracts) or disease of the conduction system may be responsible!
The treating doctor may suggest them depending on need, based on his assessment of the situation. You may even need Electro Physiological Studies (EPS)
Wishing speedy recovery