1.0All About Heart And Blood Vesselshttps://johnsonfrancis.org/generalJohnson Francishttps://johnsonfrancis.org/general/author/jf/rich600338<blockquote class="wp-embedded-content" data-secret="ocgJl89rNb"><a href="https://johnsonfrancis.org/general/what-is-atrial-fibrillation-with-rvr/">What is atrial fibrillation with RVR?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://johnsonfrancis.org/general/what-is-atrial-fibrillation-with-rvr/embed/#?secret=ocgJl89rNb" width="600" height="338" title="“What is atrial fibrillation with RVR?” — All About Heart And Blood Vessels" data-secret="ocgJl89rNb" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://johnsonfrancis.org/general/wp-includes/js/wp-embed.min.js </script> https://johnsonfrancis.org/general/wp-content/uploads/2013/04/What-is-atrial-fibrillation-with-RVR.jpg1200895What is atrial fibrillation with RVR? Atrial fibrillation is an abnormal heart rhythm originating from the upper chambers of the heart or atria. Usually the atria do not contract well in atrial fibrillation as the rate of electrical activation in atrial fibrillation is very fast, of the order of 450 to 600 times a minute. […]