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.
Preterm labor: Risks to the baby There is a simple reason why itâs always good to prolong a pregnancy until it reaches 37 weeks at least. This is because the fetus needs the time to develop properly, and they might be exposed to more dangers and complications should they be delivered any sooner than that.