Medical Definition of Entrance block

1. An incompletely understood mechanism whereby a pacemaker is protected from being discharged by the impulse from another centre; the mechanism, usually conceived as an encircling zone of unidirectionally refractory tissue permitting egress of impulses from the centre but preventing access to the centre, is seen in operation in ventricular parasystole where the parasystolic centre is protected from discharge by the sinus pacemaker and so is able to maintain its intrinsic rhythm undisturbed. Synonym: entrance block, protection. (05 Mar 2000)



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Lexicographical Neighbors of Entrance Block

entrainer
entrainers
entraining
entrainment
entrainments
entrains
entrall
entralles
entrammel
entrammeled
entrammeling
entrammelled
entrammelling
entrammels
entrance
entrance block (current term)
entrance exam
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entrance examinations
entrance fee
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entrance money
entrance pupil
entranced
entranceless
entrancement
entrancements
entrances
entranceway
entranceways

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