september 23, 2010 morning report. ecg rate rhythm what do you think? what do you want to do?
TRANSCRIPT
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September 23, 2010
Morning Report
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ECG
Rate
Rhythm
What do you think?
What do you want to do?
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SA nodeSA node
Cardiac pacemakerUpper wall of the RA
Sinus RhythmNormal heart rhythm controlled by SA nodep-wave before every QRSPR – 120-200 msec
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SA nodeSinus Arrhythmia
Healthy childrenDecrease in SA node firing due to activation
of the vagus nerve by exhalationHR varies with respirationNormal sinus rhythm with prolongation of RR
during exhalation
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The AtriaPremature Atrial Contractions (PACs)
Ectopic focus stimulates the atria without input from the SA node
CausesDrug use, caffeine, electrolyte imbalance, mostly
unknownSymptoms (Usually asymptomatic)
Skipped beat, pause followed by strong beatECG
Premature, inverted or oddly shaped P waves, sharp inflections in T waves
May have narrow, wide or no QRS depending on focusTreatment
Reassurance, avoidance
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The Atria
Atrial Flutter250-400 bpmNewborns or children with
structural heart diseaseReentrant circuit confined to RASymptoms
CHF (infants), dizziness, syncope, CP, SOBECG
Inverted “saw-tooth”Ventricular conduction - 1:1 (300bpm), 1:2 (150-200bpm)
TreatmentUrgent cardiac eval and treatment
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The AtriaAtrial fibrillation
Uncommon in young childrenRapid fibrillation of the atrial muscle without
coordinated contractionCauses
Structural heart diseaseStretching of atria
SymptomsPalpitations, CP, syncope
ECG Irregularly irregular rhythmAbsent or low voltage p-waves
TreatmentUrgent referral to cardsClot formation >24h
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The AV nodeSupraventricular Tachycardia
Rapid tachycardia originating above the bundle of His
1/250 children
3 categoriesReentrant tachycardia with accessory pathway
WPWReentrant AV nodal tachycardiaAtrial ectopic tachycardia
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SVTHeart rates 220-270bpmSymptoms
Infants prolongedPoor feeding, pallor, irritability, lethargy, HD compromise
24-48hSchool age
“beeping in chest”, heart pounding, CP, SOB, sweating, exercise intolerance
HR may be 180ECG
Narrow complex tachycardiaP waves difficult to seeFinding vary with cause
TreatmentCardiac referralEP study and ablation
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The VentriclesPremature Ventricular Contractions (PVCs)
Ectopic firings within the ventricle25% of healthy childrenSymptoms
Asymptomatic, chest fullness, dizziness, “heart skips”ECG
Premature, bizarre, wide QRS complex not preceded by a p-wave
Often followed by a compensatory pauseTreatment
Benign if single, suppressed by exercise and no family history of death
Referral to cardiology if history is suspicious
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The VentriclesLong QTc Syndrome
Associated with a potentially dangerous arrhythmia, torsades de pointes
QTc = QT/√previous RR QTc >450 msec is suggestive
FH of sudden death, deafnessSymptoms
Syncope, seizures, palpitations, cardiac arrest (10%)Fainting while swimming, playing sports or
exercisingTreatment
Refer if symptoms or if ECG is abnormal
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Ventricular Tachycardia Tachycardia of at least 3 successive ventricular
beats<30 sec – nonsustained>30 sec – sustained
CausesDrugs, caffeine, decongestants, electrolyte
imbalances
SymptomsAbnormal hearts, asymptomatic, pallor, fatigue,
palpitations, feeding intolerance
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Ventricular TachycardiaECG
Bizarre, wide QRS complex (>120 msec), tachycardia
May or may not see p-wavesT waves are opposite polarization to QRS
TreatmentABCsCardiac Evaluation
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Ventricular FibrillationRare cardiac emergencyUncoordinated activity of the cardiac muscle
fibersOften results in cardiac arrest
Nonpalpable pulsesECG
Bizarre, random waveform without clearly identifiable P waves or QRS complexes and a roaming baseline
TreatmentABCsDefibrillation