Tachycardia

fast heart rateincreased heart raterapid heart ratetachyarrhythmiareflex tachycardiarapid heartbeathigh heart ratea fast heart rateElevated heart ratefast heartbeat
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate.wikipedia
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Heart rate

heartbeatresting heart ratemaximum heart rate
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate.
Tachycardia is a fast heart rate, defined as above 100 bpm at rest.

Adrenergic storm

Sympathomimetic toxidromeadrenergic crisis
It is a life-threatening condition because of extreme tachycardia and hypertension, and is especially dire for those with prior heart problems.

AV nodal reentrant tachycardia

AV nodal re-entrant tachycardiaatrioventricular nodal re-entrant tachycardiaAVNRT
AV nodal reentrant tachycardia (AVNRT) is the most common reentrant tachycardia.
AV-nodal reentrant tachycardia (AVNRT) is a type of abnormal fast heart rhythm.

Atrial flutter

flutteratrial flutter (AFl)
When it first occurs, it is usually associated with a fast heart rate and is classified as a type of supraventricular tachycardia.

Shock (circulatory)

shockcirculatory shocktraumatic shock
Initial symptoms of shock may include weakness, fast heart rate, fast breathing, sweating, anxiety, and increased thirst.

Cocaine

cokecocaine traffickingcrack
This is the basis for the so-called fight-or-flight response, but such stimulation can also be induced by stimulants such as ephedrine, amphetamines or cocaine.
Physical symptoms may include a fast heart rate, sweating, and large pupils.

Anemia

anaemiaanemicanaemic
In severe anemia, there may be signs of a hyperdynamic circulation: tachycardia (a fast heart rate), bounding pulse, flow murmurs, and cardiac ventricular hypertrophy (enlargement).

Amphetamine

Benzedrinespeedamphetamines
Cardiovascular side effects can include hypertension or hypotension from a vasovagal response, Raynaud's phenomenon (reduced blood flow to the hands and feet), and tachycardia (increased heart rate).

Atrial fibrillation

atrial fibrilationparoxysmal atrial fibrillationAtrial fibrillation with rapid ventricular response
Atrial fibrillation is one of the most common cardiac arrhythmias.
Presentation is similar to other forms of rapid heart rate and may be asymptomatic.

Hyperthyroidism

thyrotoxicosishyperthyroidoveractive thyroid
Hyperthyroidism can also cause tachycardia.
Signs and symptoms vary between people and may include irritability, muscle weakness, sleeping problems, a fast heartbeat, heat intolerance, diarrhea, enlargement of the thyroid, hand tremor, and weight loss.

Anxiety

anxiousnervousnessanxieties
These feelings may cause physical symptoms, such as a fast heart rate and shakiness.

Hypovolemia

hemorrhagic shockhypovolemic shockvolume depletion
These include oliguria, cyanosis, abdominal and chest pain, hypotension, tachycardia, cold hands and feet, and progressively altering mental status.

Sinus tachycardia

High heart ratetachycardia, sinus
Sinus tachycardia (also colloquially known as sinus tach or sinus tachy) is an elevated sinus rhythm characterized by an increase in the rate of electrical impulses arising from the sinoatrial node.

Supraventricular tachycardia

tachycardia, supraventricularAV re-entrant arrhythmiacatecholamine surge
It is a regular narrow complex tachycardia that usually responds well to the Valsalva maneuver or the drug adenosine.
Supraventricular tachycardia (SVT) is an abnormally fast heart rhythm arising from improper electrical activity in the upper part of the heart.

Ventricular tachycardia

polymorphic ventricular tachycardiapulseless ventricular tachycardiamonomorphic ventricular tachycardia
Orthodromic conduction usually results in a narrow complex tachycardia, and antidromic conduction usually results in a wide complex tachycardia that often mimics ventricular tachycardia.
Ventricular tachycardia (V-tach or VT) is a type of regular, fast heart rate that arises from improper electrical activity in the ventricles of the heart.

Sepsis

septicaemiablood poisoningseptic
For example in sepsis >90 bpm is considered tachycardia.
Common signs and symptoms include fever, increased heart rate, increased breathing rate, and confusion.

Pheochromocytoma

phaeochromocytomapheochromocytomasadrenal cancers
Certain endocrine disorders such as pheochromocytoma can also cause epinephrine release and can result in tachycardia independent of nervous system stimulation.

Methamphetamine

crystal methmethcrystal methamphetamine
The physical effects of methamphetamine can include loss of appetite, hyperactivity, dilated pupils, flushed skin, excessive sweating, increased movement, dry mouth and teeth grinding (leading to "meth mouth"), headache, irregular heartbeat (usually as accelerated heartbeat or slowed heartbeat), rapid breathing, high blood pressure, low blood pressure, high body temperature, diarrhea, constipation, blurred vision, dizziness, twitching, numbness, tremors, dry skin, acne, and pale appearance.

Atrial tachycardia

Paroxysmal atrial tachycardiaEctopic atrial tachycardiafocal atrial tachycardia
As with any other form of tachycardia (rapid heart beat), the underlying mechanism can be either the rapid discharge of an abnormal focus, the presence of a ring of cardiac tissue that gives rise to a circle movement (reentry), or a triggered rapid rhythm due to other pathological circumstances (as would be the case with some drug toxicities, such as digoxin toxicity).

Multifocal atrial tachycardia

When a number of different clusters of cells outside the SA node take over control of the heart rate, and the rate exceeds 100 beats per minute, this is called multifocal atrial tachycardia (if the heart rate is ≤100, this is technically not a tachycardia and it is then termed multifocal atrial rhythm).

Wolff–Parkinson–White syndrome

Wolff-Parkinson-White syndromeBundle of KentWPW syndrome
Depending on the patient's health and other variables such as medications taken for rate control, atrial fibrillation may cause heart rates that span from 50 to 250 beats per minute (or even higher if an accessory pathway is present).
Symptoms can include an abnormally fast heartbeat, palpitations, shortness of breath, lightheadedness, or syncope.

Pulse

pulse ratepulsationheartbeat
In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults.

Nicotine

nicotine addictionnicotine sulfateaddicted to nicotine
The initial symptoms of a nicotine overdose typically include nausea, vomiting, diarrhea, hypersalivation, abdominal pain, tachycardia (rapid heart rate), hypertension (high blood pressure), tachypnea (rapid breathing), headache, dizziness, pallor (pale skin), auditory or visual disturbances, and perspiration, followed shortly after by marked bradycardia (slow heart rate), bradypnea (slow breathing), and hypotension (low blood pressure).

Methylphenidate

RitalinConcertaMethylin
Cardiac adverse effects may include palpitations, changes in blood pressure and heart rate (typically mild), tachycardia (rapid resting heart rate), and Raynaud's phenomenon (reduced blood flow to the hands and feet).