Atrial Action Potential

In electrocardiography, the atrial action potential are action potentials that occur in the heart atrium. They are similar to ventricular action potential with the exception of having a more narrow phase 2 (plateau phase) due to a smaller calcium influx. Also, in comparison to the ventricular action potential, atrial action potentials have a more gradual repolarization period. This indicates that the atria's repolarization currents are not very large and they do not undergo a large repolarization peak.

See cardiac action potential for more information.

Cardiovascular system, physiology: cardiovascular physiology
Heart
Volumes
  • Stroke volume = End-diastolic volume – End-systolic volume
  • Cardiac output = Heart rate × Stroke volume
  • Afterload
  • Preload
  • Frank–Starling law of the heart
  • Cardiac function curve
  • Venous return curve
  • Aortic valve area calculation
  • Ejection fraction
  • Cardiac index
Dimensions
  • Fractional shortening = (End-diastolic dimension – End-systolic dimension) / End-diastolic dimension
Interaction diagrams
  • Cardiac cycle
  • Wiggers diagram
  • Pressure volume diagram
Tropism
  • Chronotropic (Heart rate)
  • Dromotropic (Conduction velocity)
  • Inotropic (Contractility)
  • Bathmotropic (Excitability)
  • Lusitropic (Relaxation)
Conduction system /
Cardiac electrophysiology
  • Cardiac action potential
    • Atrial action potential
    • Ventricular action potential
  • Effective refractory period
  • Pacemaker potential
  • EKG
    • P wave
    • PR interval
    • QRS complex
    • QT interval
    • ST segment
    • T wave
    • U wave
  • Hexaxial reference system
Chamber pressure Central venous pressure/right atrial pressure → Right ventricular pressure → Pulmonary artery pressure → Pulmonary wedge pressure/left atrial pressure → Left ventricular pressure → Aortic pressure
Other
  • Ventricular remodeling
Vascular system/
Hemodynamics
Blood flow
  • Compliance
  • Vascular resistance
    • Total peripheral resistance
  • Pulse
  • Perfusion
Blood pressure
  • Pulse pressure
    • Systolic
    • Diastolic
  • Mean arterial pressure
  • Jugular venous pressure
  • Portal venous pressure
Regulation of BP
  • Baroreflex
  • Kinin–kallikrein system
  • Renin–angiotensin system
  • Vasoconstrictors/Vasodilators
  • Autoregulation
    • Myogenic mechanism
    • Tubuloglomerular feedback
    • Cerebral autoregulation
  • Paraganglia
    • Aortic body
    • Carotid body
    • Glomus cell

M: HRT

anat/phys/devp

noco/cong/tumr, sysi/epon, injr

proc, drug (C1A/1B/1C/1D), blte

M: VAS

anat(a:h/u/t/a/l,v:h/u/t/a/l)/phys/devp/cell/prot

noco/syva/cong/lyvd/tumr, sysi/epon, injr

proc, drug(C2s+n/3/4/5/7/8/9)

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