AED Non-Shockable Rhythm Identification
An Automatic External Defibrillator (AED) analyzes the patient's heart rhythm to determine if a shock is advised. Only specific life-threatening rhythms require defibrillation.
Understanding Shockable vs. Non-Shockable Rhythms
- Shockable Rhythms: These are chaotic or excessively fast rhythms where the heart quivers or beats too rapidly to effectively pump blood. AEDs are programmed to detect and advise shocks for these rhythms. Examples include Ventricular Fibrillation (VF) and pulseless Ventricular Tachycardia (VT).
- Non-Shockable Rhythms: These are rhythms where defibrillation is not effective or indicated. The heart may have no electrical activity (asystole) or have organized electrical activity but no resulting mechanical contraction or pulse.
Analyzing the Options
- Monomorphic Ventricular Tachycardia (VT): If pulseless, this is generally considered a shockable rhythm.
- Polymorphic Ventricular Tachycardia (PVT): This rhythm is unstable and often degenerates into VF. It is considered a shockable rhythm.
- Ventricular Fibrillation (VF): This is the most common cause of sudden cardiac arrest and is a primary target for defibrillation; it is a shockable rhythm.
- Pulseless Electrical Activity (PEA): This is characterized by organized ECG electrical activity without a detectable pulse or mechanical contraction. PEA is NOT responsive to defibrillation and is therefore a non-shockable rhythm. Treatment involves immediate CPR and addressing the underlying reversible causes.
Conclusion on AED Use
Based on the analysis, Pulseless electrical activity (PEA) is the non-shockable rhythm from the given choices, meaning an AED will not advise a shock for this condition.
Important Questions from General Clinical Conditions
- The height of the Jugular Venous Pulse is determined by :
- The SA node is situated at the junction of:
- Reverse splitting of second heart sound is most commonly seen in :
- A 70-year-old man with dyspnoea on exertion has been found to have a single second heart sound and a loud diamond-shaped, rough quality systolic murmur best heard at the right $2^{nd}$ intercostal space, radiating to the right carotid artery. Which one of the following is the likely diagnosis ?
Consider the following statements with regard to pulmonary embolism :
1. Unexplained breathlessness is the most common symptom.
2. When congestive heart failure or pneumonia fail to improve despite standard medical treatment, occult pulmonary embolism should be considered.
3. Patients with high clinical likelihood of venous thromboembolism should first undergo D-dimer testing alone without obligatory imaging tests.
Which of the statements given above are correct?
