The following electrophysiologic disturbances are seen on resting ECG, except:

P wave is negatively deflected in a normal sinus rhythm in the following leads, except:

A patient showing with tachycardia with ECG showing narrow QRS (<0.12), regular rhythm, not clear p waves, and tachycardia persists with AV block in  response to carotid sinus massage or adenosine. The patient’s condition is possibly, except:

ECG leads that view the lateral surface of the heart, except:

Which of the following is incorrectly paired?

Which of the following antiarrhythmic drugs inhibit phase 4 depolarization in SA and AV node and thus depress automaticity, prolong AV conduction and decrease heart rate and contractility?

 Drugs that do not reduce Vmax and shortens the action potential duration

   Drugs with an adverse effect of cinchonism

Most common supraventricular tachycardia

Causes of physiologic sinus tachycardia, except

 Most common form of  paroxysmal supraventricular tachycardia (PSVT)

 A 39-year-old man was brought by the HEMS to BRTTH ER due to loss of consciousness after collapsing in SM Legazpi City. His vital signs: 80/60 (palpatory), 250bpm, RR=10cpm. His ECG results: Rate: too rapid to count; Rhythm: grossly irregular; No identifiable P waves; PR interval: none; QRS complex: bizarre, varying in shape and direction. Which of the following is most likely the diagnosis?

 Which of the following best describe the underlying mechanism of paroxysmal supraventricular tachycardia?

Useful in evaluation of patients with syncope in whom there is a suspicion that exaggerated vagal tone or vasodepression may play a causal role