University:
Michigan State University
Course:
MED 611 | Cardiology Clerkship
Academic year:

2022
Views:

57

Pages:

16
Author:

Accinkiquicpqw

Bradycardia, Cardiac Pacing and Drugs Learning outcomes At the end of this workshop you should: • Be able to recognise bradycardia and differentiate • • • • between the different degrees of heart block Understand the principles of treating bradycardia Understand the indications for cardiac pacing Be aware of the different methods available for cardiac pacing Know how to apply non-invasive, transcutaneous electrical pacing safely and effectively Conducting system QRS Complex How to read a rhythm strip 1. Is there any electrical activity? How to read a rhythm strip 1. Is there any electrical activity? 2. What is the ventricular (QRS) rate? 3. Is the QRS rhythm regular or irregular? 4. Is the QRS width normal (narrow) or broad? How to read a rhythm strip 1. Is there any electrical activity? 2. What is the ventricular (QRS) rate? 3. Is the QRS rhythm regular or irregular? 4. Is the QRS width normal (narrow) or broad? 5. Is atrial activity present? (If so, what is it: P waves? Other atrial activity?) 6. How is atrial activity related to ventricular activity? Bradycardia algorithm Includes rates inappropriately slow for haemodynamic state Case study Clinical setting and history • 60-year-old man referred to admissions unit by GP • Long-term history of heart disease • Feeling light-headed and breathless Clinical course • ABCDE - A : Clear - B : Spontaneous breathing, rate 18 min-1 - C : Looks pale, P 45 min-1, BP 90/50 mmHg, CRT 3 s Initial rhythm? - D : Alert, glucose 4.5 mmol l-1 - E : Nil of note What action will you take? Case study (continued) Clinical course • No response to atropine • Patient becomes more breathless, cold, clammy and mildly confused • Change in rhythm • ABCDE - A : Clear - B : Spontaneous breathing, rate 24 min-1 widespread crackles on auscultation - C : Looks pale, HR 35 min-1, BP 80/50 mmHg, CRT 4 s - D : Responding to verbal stimulation - E : Nil of note What will you do now? Case study (continued) • Consider need for expert help • Prepare for transcutaneous pacing • Consider percussion pacing as interim measure • Confirm electrical capture and mechanical response once transcutaneous pacing has started Case study (continued) Atropine Indication • Symptomatic bradycardia Contraindication • Do not give to patients who have had a cardiac transplant Dose • 500 mcg IV, repeated every 3 - 5 min to maximum of 3 mg Actions • Blocks vagus nerve • Increases sinus rate • Increases atrioventricular conduction Side effects • Blurred vision, dry mouth, urinary retention • Confusion Case study (continued) Adrenaline Infusion of 2-10 mcg min-1 titrated to response OR Isoprenaline infusion 5 mcg min-1 as starting dose OR Dopamine infusion 2-5 mcg kg-1 min-1 Any questions? Summary You should now: • Be able to recognise bradycardia and differentiate • • • • between the different degrees of heart block Understand the principles of treating bradycardia Understand the indications for cardiac pacing Be aware of the different methods available for cardiac pacing Know how to apply non-invasive, transcutaneous electrical pacing safely and effectively

Bradycardia, Cardiac Pacing and Drugs

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