Which complex corresponds to the depolarization of the left and right ventricles. It generally corresponds to the contraction of the ventricles. - The QRS, which wave corresponds to a repolarization of the ventricles. - The T wave, Wich wave corresponds to electrical impulse traveling through the atria. This is synonymous with atrial depolarization and usually corresponds with atrial contraction? - The P wave, is regular with normal P, Q-R-S, T deflections and intervals. Rate = 60-100 at rest. - Sinus Rhythm, is a sinus rhythm with a rate less than 60 per minute in an adult - Sinus Bradycardia, is a sinus rhythm with a rate greater than 100 per minute in an adult. Note that the p waves are still present. - Sinus Tachycardia, is a sinus rhythm with a prolonged PR interval > 0.20 seconds due to a delay in transmission from the atria to the ventricles. - First-Degree Heart Block, is usually classified as Mobitz Type I (Wenckebach) or Mobitz Type II. A Mobitz Type I heart block is characterized by progressive lengthening of the PR interval until a QRS complex is dropped. - Second-Degree AV Heart Block, is a rhythm in which there is no relationship between the P and QRS waves. In this case, the P to P intervals are regular but have no relationship to the QRS complexes on the ECG. - Third-Degree Heart Block, is an extremely fast atrial rhythm with narrow QRS complexes when the impulse originates above the bundle branches (above the ventricles). - Supraventricular Tachycardia, is characterized by no waves before the QRS complex and a very irregular heart rate. - Atrial Fibrillation, is characterized by a “saw-toothed” flutter appearance on the ECG that represents multiple P waves for each QRS complex. - Atrial Flutter, is also commonly known as a “flat line” where there is no electrical activity seen on the cardiac monitor. Not responsive to electrical defibrillation. - Asystole, Can be virtually any organized ECG rhythm in a patient who is unresponsive and lacks a palpable pulse. Thus, one cannot learn a PEA rhythm. It should not be confused, however, with specific pulseless scenarios listed previously. - Pulseless Electrical Activity, is characterized by bizarre widened QRS complexes, no P waves and usually a rate over 100 per minute. May quickly degenerate to Ventricular fibrillation and death. VT may be responsive to electrical defibrillation. - Ventricular Tachycardia, is characterized by a chaotic wave pattern and no pulse. VF may be responsive to electrical defibrillation. - Ventricular Fibrillation, Treatment atrial flutter - AHA recommends an initial shock dose 0f 50-100 J for cardioverting unstable atrial flutter., Which block is clinically significant because this rhythm can progress rapidly to complete heart block? - Second-degree AV block (Type 2), Which rhythm becomes a problem when fibrillation produces a rapid heart rate that reduces cardiac output and causes symptoms or an unstable condition? - Atrial Fibrillation, At what rhythm are complications of atrial flutter prevented with early cardioversion.? - Atrial Flutter,

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