Tachycardia comes from the Greek words tachys (rapid or accelerated) and kardia (of the heart). Tachycardia typically refers to a heart rate that exceeds the normal range for a resting heartrate (heartrate in an inactive or sleeping individual). In humans, the upper threshold of a normal heart rate is usually based upon age, sometimes it can be very dangerous depending on how hard the heart is working and the activity:
When the heart beats rapid...
more
Read article at Wikipedia
Tachycardia
Similar topics in Freebase
-
Anxiety
Anxiety is a psychological and physiological state characterized by cognitive, somatic, emotional, and behavioral components. These components combine to create an unpleasant feeling that is typically associated with uneasiness, fear, or worry. Anxiety is a generalized mood condition that occurs... -
Panic attack
Panic attacks are very sudden, discrete periods of intense anxiety, mounting physiological arousal, fear, stomach problems and discomfort that are associated with a variety of somatic and cognitive symptoms. The onset of these episodes is typically abrupt, and may have no obvious triggers. Although... -
Cardiac arrhythmia
Dysrhythmia is a cause of certain cardiac diseases -
Fatigue
Fatigue is a major safety concern in many fields, but especially in transportation, because fatigue can result in disastrous accidents. Fatigue is considered an internal precondition for unsafe acts because it negatively affects the human operator's internal state. Research has generally focused on... -
Koilonychia
Koilonychia (also known as spoon nails) is a nail disease that can be a sign of hypochromic anemia, especially iron-deficiency anemia. Koilonychia literally means "spoon nails." It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave... -
Malaise
Malaise (pronounced /məˈleɪz/, mal-aze) is a feeling of general discomfort or uneasiness, an "out of sorts" feeling, often the first indication of an infection or other disease. Malaise is often defined in medicinal research as a "general feeling of being unwell". The term is also often used... -
Palpitation
A palpitation is an abnormality of heartbeat that causes a conscious awareness of its beating, whether it is too slow, too fast, irregular, or at its normal frequency. The word may also refer to this sensation itself. It can be caused by (but should not be confused with) ectopic beat, which is a... -
Chest pain
In medicine, chest pain is a number of serious conditions and is generally considered a medical emergency. Even though it may be determined that the chest pain is non-cardiac in origin, this is often a diagnosis of exclusion made after ruling out more serious causes of the pain. As in all medicine,... -
Dizziness
Dizziness refers to an impairment in spatial perception and stability. It is considered imprecise. It can be used to mean vertigo, presyncope, disequilibrium, or for a non-specific feeling such as giddiness or foolishness. -
Dyspnea
Dyspnea or dyspnoea (pronounced disp-nee-ah, IPA /dɪsp'niə/), from Latin dyspnoea, from Greek dyspnoia from dyspnoos, shortness of breath) or shortness of breath (SOB) is a debilitating symptom that is the experience of unpleasant or uncomfortable respiratory sensations. It is a common symptom of...