1. although many arrhythmias are not life threating,and can occur at any age.
2. A doctor can detect an irregular heartbeat during a physical exam by taking your pulse or through investigations like: EKG, Holter Monitoring,stress
EKG, echo cardiogram to rule out any coronary artery
3. stop smoking
,limit alcohol intake, and caffeine intake [such as tea, coffee, soft drinks, and some over-the-counter medications), stay away from stimulants used in cough and cold medications.
PS: According to recent European society of Cardiology study: potential effect of H1N1 influenza
infection [flu like symptoms] can trigger ventricular arrhythmia
, so also check with the same.