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Brugada R, Hong K, Cordeiro JM, Dumaine R, Short QT syndrome, CMAJ, 2005;173(11):134954. Vijay Kunadian Kardia showed normal sinus rhythm with wide QRS. However, all three waves may not be visible and there is always variation between the leads. A wide QRS complex tachycardia in a patient older than 35 years is more likely to be VT.4 A known history of coronary artery disease, previous myocardial infarction or cardiomyopathy makes VT a probable diagnosis. Conclusion: The nonsustained VT was actually a paced rhythm due to inappropriate and intermittent tracking of atrial fibrillation by the dual-chamber pacemaker. Interestingly enough, no statistically significant difference in sensitivity and specificity was found between the Brugada, Griffith and Bayesian algorithm approaches.25. Answer (1 of 2): If, as you say, the heart rate is normal, then you have a bundle branch block that comes and goes, and the cause could be ischemia, that is a partly blocked vessel, or multiple vessels. Sick sinus syndrome - Symptoms and causes - Mayo Clinic AIVR is a wide QRS ventricular rhythm with rate of 40-120 bpm, often with variability during the episode. The term narrow QRS tachycardia indicates individuals with a QRS duration 120 ms, while wide QRS tachycardia refers to tachycardia with a QRS duration >120 ms. 1 Narrow QRS complexes are due to rapid activation of the ventricles via the His-Purkinje system, suggesting that the origin of the arrhythmia is above or within the His bundle. Wide Complex Tachycardia - Diagnosis - Cardio Guide Respiratory sinus arrhythmia doesnt cause chest pain. Normal sinus rhythm typically results in a heart rate of 60 to 100 beats per minute. When it's not, you could have an irregular heartbeat called AFib . Thick black lines are printed every 3 seconds, so the distance between 3 black lines is equal to 6 seconds. QRS complex: 0.06 to 0.08 second (basic rhythm and PJC) Comment: ST segment depression is present. The prognostic value of a wide QRS >120 ms among patients in sinus rhythm is well established. An abnormally slow heart rate can cause symptoms, especially with exercise.