CARDIAC ARRHYTHMIAS

Clk. Alexander L. Gonzales IIDecember 14, 2010

SINUS RHYTHM

>60bpm and <100bpm

P-wave in front of QRS

QRS is narrow Rhythm is regular

CARDIAC ARRHYTMIAS

BRADYARRHYTHMIAS

SINUS BRADYCARDIA

Slow heart beat (<60bpm)

Normal rhythm, but slow

P wave is present QRS is narrow

SINUS PAUSE

SA node stops working

Pause in heart beat for 6-8s

CARDIAC ARRHYTHMIAS

PREMATURE BEATS

ATRIAL PREMATURE CONTRACTION QRS is normal P-wave is present

but looks different on the premature beat

AV NODAL PREMATURE CONTRACTION = JUNCTIONAL

No P-wave before premature beat b/c originates in AV node, not atria

QRS is normal

PREMATURE VENTRICULAR CONTRACTION

Every other beat is abnormal (ventricular bigemini)

One QRS complex and P-wave are normal

Next QRS is wide and T-wave is inverted (-) repolarization is abnormal

CARDIAC ARRHYTMIAS

SUPRAVENTRICULAR TACHYCARDIAS

SINUS TACHYCARDIA

>100bpm Normal P-wave Narrow QRS

ATRIAL TACHYCARDIA

P-wave is inverted (-)

2 P-waves per every QRS complex

AV NODAL REENTRANT TACHYCARDIA

No P-wave b/c it’s within QRS complex

QRS is narrow, looks normal but is faster

Regular rhythm

PREEXCITATION: WOLFE PARKINSON WHITE SYNDROME

Slurred upslope on QRS and wider complex

PR is shorter -wave (pts. prone to

SVTs) Tachycardia pathway:

AV node accessory pathway atrium (-wave disappears, but will return once HR)

SVT WITH SHORT RP (REFRACTORY PERIOD)

QRS is narrow 1:1 relationship

b/w P-wave and QRS

Can see P-wave before QRS

ATRIAL FLUTTER

Regular and reproducible

QRS is narrow See (-) complexes Saw tooth pattern

ATRIAL FIBRILLATION

Disorganized rhythm

Pulse is irregularly irregular/irregular rhythm

QRS is narrow No P-wave

VENTRICULAR TACHYARRHYTHMIA

Occur in bottom chambers

>3 PVC in a row V-tach Nonsustained stops

after a certain time period

No P-waves Repolarization is

abnormal QRS complexes are wider More QRS than P-waves

TORSADES DE POINTES

Long QT interval QRS complexes

are all over the place look abnormal

VENTRICULAR FIBRILLATION

Complete disorganization

No P-waves No QRS complexes