1.0SozoCardiology - Dr Ooi Yau Wei Interventional Cardiologisthttps://www.sozocardiology.com/zhRealismahttps://www.sozocardiology.com/zh/author/adrian/rich600338<blockquote class="wp-embedded-content" data-secret="Hiw7bZttWz"><a href="https://www.sozocardiology.com/zh/heart-investigations/12-lead-electrocardiogram-ecg/">12导联心电图 (ECG)</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.sozocardiology.com/zh/heart-investigations/12-lead-electrocardiogram-ecg/embed/#?secret=Hiw7bZttWz" width="600" height="338" title="“12-Lead Electrocardiogram (ECG)” — SozoCardiology - Dr Ooi Yau Wei Interventional Cardiologist" data-secret="Hiw7bZttWz" 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://www.sozocardiology.com/wp-includes/js/wp-embed.min.js </script>If you are viewing this page in Chinese, translations are coming soon Conduction system of the Heart Your heart has an electrical system that controls the speed and pattern of your heart beat. A normal “sinus rhythm” starts from the Sinoatrial (SA) node and spreads down to the Atrioventricular (AV) node as the atria contract […]