1. A speech sound, such as (Ä) or (Ä­), created by the relatively free passage of breath through the larynx and oral cavity, usually forming the most prominent and central sound of a syllable. 2. A letter, such as a, e, i, o, u, and sometimes y in the English alphabet, that represents a vowel.
Tachycardia is a heart rate of greater than 100 beats per minute. A normal heart rate is 60 to 100 beats per minute at rest. Ventricular tachycardia is a regular, faster-than-normal heart rate that begins in the heart's lower chambers.In most patients with ventricular tachycardia the rate is in the range of 170 beats per minute or more. normal heart rate is 60 to 100 beats per minute at rest. Ventricular tachycardia is a regular, faster-than-normal heart rate that begins in the heart's lower chambers.
About tachycardia, the fast beat. Tachycardia is a rapid heart rate that is faster than 100 beats per minute, and it causes the heart to work too hard. This means that the heart does not have enough time to fill and that not enough blood is being pumped forward. This results in symptoms including palpitations, chest pain, dizziness and fainting.