1.0All About Heart And Blood Vesselshttps://johnsonfrancis.org/generalJohnson Francishttps://johnsonfrancis.org/general/author/jf/rich600338<blockquote class="wp-embedded-content" data-secret="B8LHrNGnm1"><a href="https://johnsonfrancis.org/general/is-first-degree-heart-block-dangerous/">Is first degree heart block dangerous?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://johnsonfrancis.org/general/is-first-degree-heart-block-dangerous/embed/#?secret=B8LHrNGnm1" width="600" height="338" title="“Is first degree heart block dangerous?” — All About Heart And Blood Vessels" data-secret="B8LHrNGnm1" 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/2022/02/Is-first-degree-heart-block-dangerous1.jpg1200677Is first degree heart block dangerous? First degree heart block is an abnormality in the electrical conduction of the heart noted on the ECG, the recording of the electrical activity of the heart. It is not a block in the blood vessels of the heart which we are more familiar with. The waves on an […]