Chronotropic

Chronotropic effects (from chrono-, meaning time, and tropos, "a turn") are those that change the heart rate.

Chronotropic drugs may change the heart rate by affecting the nerves controlling the heart, or by changing the rhythm produced by the sinoatrial node. Positive chronotropes increase heart rate; negative chronotropes decrease heart rate.

A dromotrope affects atrioventricular node (AV node) conduction. A positive dromotrope increases AV nodal conduction, and a negative dromotrope decreases AV nodal conduction. A lusitrope is an agent that affects diastolic relaxation.

Many positive inotropes affect preload and afterload.

Read more about ChronotropicNegative Chronotropes, Positive Chronotropes

Other articles related to "chronotropic":

Dromotropic
... are often (but not always) inotropic and chronotropic ... stimulation is usually negatively dromotropic, inotropic, and chronotropic ... calcium current in cardiac tissues, thereby having a negatively dromotropic, chronotropic and inotropic effect ...
Calcium Channel Blocker - Mechanism of Action - Cardiac Action
... This results in a negative chronotropic effect, or a lowering of heart rate ... The negative chronotropic effects of calcium channel blockers make them a commonly used class of agents in individuals with atrial fibrillation or flutter in whom control of the heart rate is generally a goal ... Only the non-dihydropyridine CCBs are considered to have negative inotropic and chronotropic effects ...
Beta Blocker - β-Receptor Antagonism
... by epinephrine and norepinephrine induces a positive chronotropic and inotropic effect on the heart and increases cardiac conduction velocity and automaticity ... beta blockers is unclear, but may involve reduction in cardiac output (due to negative chronotropic and inotropic effects) ... Antianginal effects result from negative chronotropic and inotropic effects, which decrease cardiac workload and oxygen demand ...
Chronotropic - Positive Chronotropes
... Cardiac cycle Wiggers diagram Pressure volume diagram Tropism Chronotropic (Heart rate) Dromotropic (Conduction velocity) Inotropic (Contractility) Bathmotropic (Excitability) Lusitropic (Relaxation ...