How Can You Tell if You Have White Mold or Efflorescence? First, look at the type of material on which you see the white substance. If you see it on anything other than concrete or masonry, itâs mold. Second, spray the substance with a little water in a spray bottle and simply wipe it with a rag.
Thus, as shown in electrophysiologic studies, PR interval prolongation (ie, first-degree AV block) may be due to conduction delay within the right atrium, the AVN, the His-Purkinje system, or a combination of these. Overall, dysfunction at the AVN is much more common than dysfunction at the His-Purkinje system.
Prescribers are advised to consider the possibility of drug-induced QT prolongation or Torsades de Pointes (TdP) in patients presenting with new onset syncope, palpitations, seizures or resuscitated cardiac arrest.n up-to-date database of medicines with the potential to cause QT prolongation/TdP, including a separate list of medicines to be avoided by patients with congenital long QT syndrome, is available on-line at www.qtdrugs.org.