The Cardiovascular System We’ve talked some about the heart before – in case you’ve missed the videos on EKGs – those are below, also review the links from these pages that page can help you if you’re having trouble with the electrical system of the heart. http://www.nclexreviewonline.com/nclex-topics-ekg-part-1-general-ekg-bradycardia-sinus-tach/ http://www.nclexreviewonline.com/ekg-part-2-atrial-fib-atrial-flutter-v-tach-v-fib/ Next time we’ll go into depth about other heart related topics.