EASY WAY TO REMEMBER: SUPRAVENTRICULAR TACHYCARDIA [ATRIAL TACHYCARDIA]

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 SVT (ATRIAL TACHYCARDIA) BASICS

[ABNORMAL FOCUS IN THE ATRIUM] ATRIA DEPOLARIZE FASTER THAN 150/MIN.

THE AV NODE CANNOT CONDUCT ATRAIL RATES OF DISCHARGE GREATER THAN 200/MIN, IF THE ATRIAL  RATE IS FASTER THAN THIS, " ATRIVENTRICULAR BLOCK "OCCURS, WITH SOME P WAVES NOT FOLLOWED BY QRS COMPLEXES. 

THE DIFFERENCE BETWEEN THIS SORT OF ATRIOVENTICULAR BLOCK AND SECOND DEGREE HEART BLOCK IS THAT ATRIOVENTRICULAR BLOCK ASSOCIATED WITH TACHYCARDIA THE AV NODE IS FUNCTIONING PROPERLY - IT IS PREVENTING THE VENTRICLES FROM BEING ACTIVATED AT A FAST RATE.

IN FIRST, SECOND (OR) THIRD DEGREE HEART BLOCK ASSOCIATED WITH SINUS RHYTHM, THE AV NODE ( OR ) THE HIS BUNDLE ARE NOT CONDUCTING NORMALLY.





NOTE: AFTER 3 SINUS BEATS, ATRIAL TACHYCARDIA DEVELOPS AT A RATE OF 150/MIN.

            P WAVES CAN BE SEEN SUPER IMPOSED ON THE T WAVES OF THE PRECEDING BEATS.

            THE QRS COMPLEXES HAVE THE SAME SHAPE  AS THOSE OF THE SINUS BEATS.

SIMPLE CONCEPT: ABSENT P WAVE - REGULAR  - SVT

                                    ABSENT P WAVE - IRREGULAR - A. FIB 

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