Reciprocating Reentry

Focus, reentry, or "focal" reentry?

THE QUESTION WHETHER tachyarrhythmias are caused by enhanced impulse formation (“focus”) or by reentrant excitation (“reentry”) has been the subject of debate for more than a century. In 1887 McWilliam (12) was the first to suggest that disturbances in impulse propagation could be responsible for fibrillation, and he clearly envisaged the possibility that myocardial fibers could be reexcited as...

Mapping Reentry

• Small-circuit reentry (microreentry) in which extremely slow conduction in a focal area sustains the reentry also presents with centrifugal activation. Unlike automaticity, however, the local bipolar electrograms at the site of the apparent focal source are fragmented and abnormal with microreentry. • When mapping 1 chamber, say the right atrium, but a macroreentry circuit is located within t...

Prisoner Reentry

Several large evaluations of correctional programs across the United States have found that offender assessment is one of the most poorly implemented principles of effective offender intervention. Correctional programs have relied too much on subjective, clinical assessments of offenders’ likelihood of re-offending or risk, and specific risk factors. Corrections programs have neglected one of t...

Object Substitution Without Reentry?

G. Francis and F. Hermens (2002) used computer simulations to claim that many current models of metacontrast masking can account for the findings of V. Di Lollo, J. T. Enns, and R. A. Rensink (2000). They also claimed that notions of reentrant processing are not necessary because all of V. Di Lollo et al.’s data can be explained by feed-forward models. The authors show that G. Francis and F. He...

Bundles branch reentry.