Understanding your customers and being able to reach them are two different things. Your segments' characteristics and behavior should help you identify the best way to meet them. For example, you may find that a key segment is resistant to technology and relies on newspaper or radio ads to hear about store promotions, while another segment is best reached on your mobile app. One of your segments might be a male retiree who is less likely to use a mobile app or read email, but responds well to printed ads.

21 How can a complete the atrioventricular (AV) block be diagnosed on an electrocardiogram (ECG)?

22 Usually, we look for an RSR pattern for bundle branch block in the chest leads. What does it mean if there is an RSR pattern in the limb leads?

23 What is Wolff-Parkinson-White syndrome?

24 In management of atrial fibrillation (AF), is the priority to control ventricular rate or to restore cardiac rhythm?

25 Can digoxin be given in paroxysmal atrial fibrillation?

26 In a patient with atrial fibrillation and bronchial asthma, what is the recommended treatment and do beta-blockers make the condition worse?

27 What is the difference between atrial flutter and atrial tachycardia?

28 What are the possible causes of atrial extrasystoles, in a patient with a normal echo, which last for several days and then disappear spontaneously? Is treatment with anxiolytics recommended?

29 In the treatment of ventricular tachycardia, could lidocaine be used in the absence of any other drug? How effective is lidocaine?

30 Why is an extremely low level of potassium in the blood sometimes a cause of ventricular fibrillation?