Download - ECG diagnosis of chamber enlargement
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ECG Criterias for Chamber Enlargement
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Left Ventricular Hypertrophy
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Pressure overload pattern
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Volume overload pattern
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• Sokolow-Lyon voltages
• SV1 + R V5,6 > 3.5 mVSensitivity 22%Specificity 100 %
• R aVL > 1.1 mV • R V5,6 > 2.6 mV
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• Romhilt-Estes point score system– Any limb lead R wave or S wave > 2.0 mV (3 points)
or SV1 or SV2 ≥ 3.0 mV (3 points)
or RV5 to RV6 ≥ 3.0 mV (3 points)– ST-T wave abnormality, no digitalis (3 points)
ST-T wave abnormality, digitalis therapy (1 point)– Left atrial abnormality (3 points)– Left axis deviation ≥ −30 degrees (2 points)– QRS duration ≥ 90 msec (1 point)– Intrinsicoid deflection in V5 or V6 ≥ 50 msec (1 point)
• Probable =4, Definite > = 5• Sn 35-55 %, Specificity 85-95 %
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• Cornel Voltage criteria
–SV3 + R aVL ≥ 2.8 mV (for men)
–SV3 + R aVL >2.0 mV ( women)–Sensitivity 42%–Specificity 96%
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• Cornell voltage duration measurement– QRS duration X Cornell voltage > 2,436 mm-sec
( + 8mm if female )– QRS duration X sum of voltages in all leads > 1,742
mm-sec– Sn 51 % and specificity of 95 %– Accurate in obese
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• Cornell Regression equation – Risk of LVH = 1/(1+ e−exp)– For subjects in sinus rhythm,– exp = 4.558 − 0.092 (SV3 + RaVL) − 0.306 TV1 −
0.212 QRS − 0.278 PTFV1 − 0.559 (gender)– PTF is the area under the P terminal force in lead
V1 (in mm-sec)– gender = 1 for men and 2 for women.– LVH is diagnosed present if exp < −1.55
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• LVH : total QRS voltage in all 12 leads > 175 mm
• LVH : R in V6 = > V5 • Gertsch index : S III + max ( R+S) in any
precardial lead > 3.0 mV . valid even if LAFB• Lewis score: R I + S III > 17 mm
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More sensitive : LVH in HTN : sum of the QRS voltage of 12 ECG leads >120 mm
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SOURCE: Hurst 12/e Kafka, Burggraf, Milliken
90 % of LBBB have LVHA left atrial P-wave abnormality QRS duration > 155 ms
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SOURCE : hurst 12/e Gertsch, Theler, Foglia
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RBBB and LVH • RBBB decreases sensitivity of precardial voltage criteria• LAA can be useful• Point score system can be useful 96 % specific
S n 5 2 %
S n 5 2 %
S p 9 6 %
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Right Ventricular hypertrophy
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R’ > 15 mm in RBBB
Cabrera index > 0.5R in V1/(R v1 + s v1)
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Sokolow Lyon criteria for RVH:– R V1 + S V5, V6 > 10.5 mm– R V1 > 7 mm– R in aVR > 5mm– S V1 < 2mm
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• Butler leggett formula :RVH : Anterior (R or R’ in v1 or v2) + Right (deepest S in I or v6) – Posterolateral ( S in V1) => 0.7mV ( Sn 34% and Sp 95%)
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RVH Morphology
1. Precardial Voltage changes2. ST T changes over RV 3. Delayed onset of intrinsicoid deflection4. normal QRS duration5. RAD
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CHOU Types of RVH• Type A: Typical RVH
tall R in V1 , Prominent S in V5, V6• Type B: Incomplete RBBB pattern( ASD, RHD )
R in V1 >0.5 mV with R/S >1, Normal QRS in V5, V6
• Type C: Chronic Lung Disease (rS V1, V2 and RS in V5, V6 precardial leads)– ECG changes due to both RVH + anatomical shift
of heart
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• RAD and Clockwise rotation is very common in Type A RVH compared to B & C
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The signs of acute RV overload :• Change in the ÂQRS (>30° to the right)• Transient negative T waves • SI, QIII TIII pattern (McGinn-White pattern) in
the frontal plane and an RS or rS pattern in V6 • Appearance of a complete right bundle-
branch block morphology often with ST-segment elevation
• S1Q3T3 pattern occurs in only about 10% PE PPV 23- 69%
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Chronic Obstructive Pulmonary Disease • reduced amplitude of the QRS complex• right axis deviation in the frontal plane• delayed transition in the precordial leads• Evidence of true RVH
– (1) RAD > 110 degrees– (2) deep S waves in the lateral precordial leads– (3) an S1Q3T3 pattern
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Biventricular hypertrophy • Diagnostic voltage criteria for both ventricles• Delayed intrinsicoid delection over both
ventricles• Repolarization changes over both• LVH with RAD of QRS• LVH with RAE• Deep S in LVH• LVH with clock wise rotation of precardial
morphology
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Biventricular hypertrophy
• LAD with counterclockwise rotation in RVH• Large equiphasic QRS in midprecardial leads
>6mm( Katz wachtel sign) • Tall R in Left precardial leads + small s in V1 or
inverted t waves in right precardial leads
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Atrial Enlargement
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RAA • Q waves (especially qR patterns) in the right
precordial leads (100 % specific)• low-amplitude QRS complexes (<0.6 mV) in
lead V1 with a threefold or greater increase in lead V2 (90 % specific)
• Severe RAE prominent terminal negativity in V1 ( Pseudo LAE pattern )
• Early terminal negativity of P V1 (< 0.03 s)
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AF – LAE present if f wave > 1mm in V1
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LAE Criteria Sensitivity specificity
Prolonged P wave duration > 120 msec in lead II 33 88
Prominent notching of P wave, usually most obvious in lead II, with interval between notches of 0.40 msec (P mitrale)
15 100
Ratio between the duration of the P wave in lead II and duration of the PR segment > 1.6 Macruz index
31 64
Increased duration and depth of terminal- negative portion of P wave in lead V1 (P terminal force) so that area subtended by it > 0.04 mm-sec Morris index
69 93
Terminal negative deflection in V1 > 0.1 mV 60 93
duration > 0.04 s 83 80
Leftward shift of mean P wave axis to between −30 and −45 degrees
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Biatrial Enlargement
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