Diagnosis. 1  Sinus tachycardia is physiologic or appropriate when a reasonable stimulus, such as the catecholamine surge associated with fright, stress, or physical activity, provokes the tachycardia. It is identical to a normal sinus rhythm except for its faster rate (>100 beats per minute in adults). Sinus tachycardia is considered by most sources to be an SVT. Sinoatrial node reentrant tachycardia (SANRT) is caused by a reentry circuit localised to the SA node, resulting in a P-wave of normal shape and size that falls before a regular, narrow QRS complex.
card verification value (CVV) Card verification value (CVV) is a combination of features used in credit, debit and automated teller machine (ATM) cards for the purpose of establishing the owner's identity and minimizing the risk of fraud. The CVV is also known as the card verification code (CVC) or card security code (CSC). Download this free guide.
The CVV code adds assurance that the consumer placing the order has access or physical possession of the credit card itself in order to use the CVV code. The CVV is a 3 or 4 digit code embossed or imprinted on the reverse side of Visa, MasterCard and Discover cards and on the front of American Express cards. Visa, MasterCard, American Express and Discover have been using the CVV since the late 1990's. The CVV is an important layer of security to help you reduce your risks in accepting card-Not-Present transactions and may be required or recommended by your payment processor or merchant bank.