Cardiac Dysrhythmias Advanced Questions with Correct Answers 2025

Cardiac Dysrhythmias Advanced Questions with
Correct Answers 2025
1. WhatUisUtheUpacemakerUofUtheUheartUnormally? CorrectUans -

U SAUNode.UWhereUdoesUtheUSAUnodeUoriginate? CorrectUans -

U UpperUrightUatrium.UWhatUisUtheUpathwayUofUconductionUinUtheUheart?

CorrectUans -U SAUnode
➔ atriaU->UAVUnodeU->UbundleUofUhisU->UbundleUbranchesU-
>UpurkinjeUfibersU->Uventricles.

2. WhatUdoesUstimulationUofUtheUvagusUnerveUcause? CorrectUans -
UDecreasedUfiringUofUtheUSAUnodeUandUslowedUimpulseUconductionUofUtheUAVU

node.

3. WhatUdoesUstimulationUofUtheUsympatheticUnervesUcause?U U CorrectUansU -
UIncreased UfiringUofUtheUSAUnodeUandUincreasedUimpulseUthroughUtheUAVUnode, Ua

ndUcardiacUcontractility.

4. WhatUdoesUtheUPUwaveUrepresent? CorrectUans -
U TimeUforUtheUpassageUofUtheUelectricalUimpulseUthroughUtheUatriumUcausingUatri

alUdepolarizationU(contraction).

5. WhatUisUtheUnormalUPUwaveUduration?U U U U CorrectUansU U -U 0.06U-U0.12.

6. WhatUisUaUpossibleUvariationUcauseUofUaUPUwave? CorrectUans -
UDisturbanceUinUconductionUwithinUtheUatria.




7. WhatUdoesUtheUPRUintervalUrepresent? CorrectUans -
U TheUmeasureUfromUtheUbeginningUofUtheUPUwaveUtoUtheUbeginningUofUtheUQRSUco

mplex,UrepresentsUtimeUtakenUforUimpulseUtoUspreadUthroughUtheUatria,UAVUnode,Ua
ndUbundleUofUhis,UtheUbundleUbranchesUandUpurkinjeUfibers,UtoUaUpointUofUimmediat
elyUprecedingUventricularUcontraction.

8. WhatUisUtheUnormalUPRUinterval?U U U U CorrectUansU U -U 0.12U-U0.20.

9. WhatUisUaUpossibleUvariationUcauseUwithUPRUinterval? CorrectUans -
UDisturbanceUinUconductionUusuallyUinUtheUAVUnode,UbundleUofUhis,UorUbundleU

branchesUbutUcanUbeUatriaUasUwell.

10. WhatUdoesUtheUQRSUintervalUrepresent?U U CorrectUansU -
UMeasureUfrom UbeginningUtoUendUofUQRSUcomplex,UrepresentUtimeUtakenUforUd

epolarizationU(contraction)UofUbothUventriclesU(systole).

11. WhatUisUtheUnormalUQRSUinterval?U U U U CorrectUansU U -U <0.12.




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, 12. WhatUisUaUpossibleUvariationUcauseUwithUtheUQRSUinterval? CorrectUans -
UDisturbanceUinUconductionUinUtheUbundleUbranchesUorUinUtheUventricles.




13. WhatUdoesUtheUSTUSegmentUrepresent? CorrectUans -
U MeasureUfromUtheUSUwaveUofUtheUQRSUcomplexUtoUtheUbeginningUofUtheUTUwave; U

representsUtimeUbetweenUventricularUdepolarizationUandUrepolarizationU(Diastole);
UshouldUbeUisoelectricU(flat).




14. WhatUisUtheUnormalUSTUsegment? CorrectUans -U 0.12.

15. WhatUisUaUpossibleUvariationUcauseUwithUtheUSTUsegment? CorrectUans -
UDisturbanceUusuallyUcausedUbyUischemia,UinjuryUorUinfarction.




16. WhatUdoesUtheUTUwaveUrepresent? CorrectUans -
U RepresentsUtimeUforUventricularUrepolarization,UshouldUbeUupright.




17. WhatUisUtheUnormalUTUwave? CorrectUans -U 0.16.

18. WhatUisUaUpossibleUvariationUcauseUforUaUTUwave?U U CorrectUansU -
UDisturbanceUusuallyUcausedUbyUelectrolyteUdisturbances; UischemiaUorUi

nfarction.

19. WhatUdoesUtheUQTUintervalUrepresent? CorrectUans -
U Measured UfromUbeginningUofUtheUQRSUtoUendUofUtheUTUwave,UrepresentsUtimeUt

akenUforUentireUelectricalUdepolarizationUandUrepolarizationUofUtheUventricles.

20. WhatUisUtheUnormalUQTUinterval?U U U U CorrectUansU U -U 0.34U-U0.43.

21. WhatUisUtheUpossibleUvariationUcauseUforUaUQTUinterval? CorrectUans -
UDisturbanceUusuallyUaffectedUrepolarizationUmoreUthanUdepolarizationUandUca

useUbyUdrugs,UelectrolyteUimbalances,UandUchangeUinUhr.

22. WhatUisUtheUnormalUfiringUofUtheUSAUNode? CorrectUans -U 60U-
U100Utimes/min.




23. WhatUisUtheUnormalUfiringUofUtheUAVUNode? CorrectUans -U 40U-
U60Utimes/min.




24. WhatUisUtheUnormalUfiringUofUtheUBundleUofUHIS/PurkinjeUFibers?
CorrectU
ans -U 20U-
U40Utimes/min.




25. WhatUareUtheUcharacteristicsUofUNormalUSinusURhythm? CorrectUans -
U60U-U100Ubpm,Uregular, UnormalUPUwave/PR UandUQRS.




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