Left Axis Deviation: Causes & Reasons

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Possible Causes for Left Axis Deviation

Atrial Septal Defect

In primum defects left axis deviation is seen in most patients with an axis of > -30 degrees and very few patients have right axis deviation. [en.wikipedia.org]

When an ostium primum atrial defect is present, the ECG reveals left axis deviation. [healio.com]

Signs and symptoms[edit] On ECG a left axis deviation is generally found in ostium primum ASD, but an RSR pattern (M pattern) in V1 is characteristic. [en.wikipedia.org]

Ostium Primum Atrial Septal Defect

In primum defects left axis deviation is seen in most patients with an axis of > -30 degrees and very few patients have right axis deviation. [en.wikipedia.org]

Each ECG showed persisting left axis deviation with no new conduction abnormalities. [circ.ahajournals.org]

Left axis deviation (-20 to -60 deg) is always present. q in I & avL (counterclockwise loop). qRs in v5 & v6 due to LV volume overload. [heartpearls.com]

Left Ventricular Hypertrophy

Left axis deviation. [lifeinthefastlane.com]

[…] atrial involvement - terminal deflection of P wave in V1 is 1 box wide, and 1 box deep or more (3 points) Left axis deviation - QRS axis is -30 degrees or more negative [merckmanuals.com]

Left axis deviation. ST elevation in the right precordial leads V1-3 (“discordant” to the deep S waves). Prominent U waves (proportional to increased QRS amplitude). [lifeinthefastlane.com]

Endocardial Cushion Defect

Abstract Three groups of patients are identified in the series of secumdum atrial septal defect with left axis deviation in an analysis of 910 patients of secundum atrial [ncbi.nlm.nih.gov]

Left axis deviation Biventricular hypertrophy Chest X-ray Cardiomegaly with increased pulmonary vascular markings Treatment Close the atrial and/or ventricular septal defects [echocardiology.org]

Complete: ostium primum atrial septal defect, canal type ventricular septal defect, common atrioventricular valve Incomplete: two separate atrioventricular valve orifices, left [echocardiology.org]

Left Bundle Branch Block

Left bundle branch block is usually associated with normal or left axis deviation. [ncbi.nlm.nih.gov]

Abstract An electrocardiogram (ECG) of an 82-year-old woman (see Figure 1 ) showed complete left bundle branch block (LBBB: QRS duration 148ms), left axis deviation to -52o [radcliffecardiology.com]

Left bundle branch block is usually associated with normal or left axis deviation. Rarely the ECG shows a LBBB with changing QRS morphology and changing axis deviation. [ncbi.nlm.nih.gov]

Tricuspid Atresia

CXR : decreased pulmonary blood flow and oligemic lung field ECG : left axis deviation PGE1 to maintain patent ductus arteriosus modified Blalock-Taussig shunt to maintain [en.wikipedia.org]

Cardiomegaly and increased pulmonary vascular markings on the chest x-ray film and left axis deviation with left ventricular hypertrophy on the ECG are usually present. [ncbi.nlm.nih.gov]

ECG characteristically shows left axis deviation (between 0 ° and − 90 ° ) and left ventricular hypertrophy. [msdmanuals.com]

Left Anterior Fascicular Block

It is caused by only the anterior half of the left bundle branch being defective. It is manifested on the ECG by left axis deviation. [en.wikipedia.org]

Criteria Abnormal left axis deviation [3] (usually between –45° and –60°) [4] qR pattern (small q, tall R) in the lateral limb leads I and aVL rS pattern (small r, deep S) [ipfs.io]

left axis deviation; see image below. [healio.com]

Hypertrophic Cardiomyopathy

(B) Electrocardiogram on admission showing sinus rhythm, left axis deviation, right atrial enlargement, right bundle branch block, and positive R wave on lead aVR. [ekjm.org]

axis deviation, and deep, narrow so-called "needle-like" q waves, typically in leads I, L, V5 and V6. [radiopaedia.org]

Electrocardiography demonstrated sinus rhythm; left axis deviation; right atrial enlargement; right bundle branch block; T-wave inversions on leads I, aVL, and V1-V6; and [ekjm.org]

Ventricular Tachycardia

They all have an RBBB shape because of an origin in the left ventricle. The most common type is shown in panel A. The frontal QRS axis shows left axis deviation. [heart.bmj.com]

The QRS complexes display morphology similar to right bundle branch block and there is left axis deviation. [ecgwaves.com]

Axis shift of >40° between NSR and WCT- Right superior (northwest) axis (-90° to -180°)- Left axis deviation with RBBB morphology- Right axis deviation with LBBB morphology [clinicaladvisor.com]

Anomalies of Coronary Artery Origin

His electrocardiogram revealed normal sinus rhythm at a rate of 80 beats/min, left axis deviation, left atrial abnormality, and T-wave inversion in lead V 6. [read.nxtbook.com]

Left Ventricular Dilatation

Biatrial enlargement Left ventricular hypertrophy or biventricular enlargement Left bundle branch block ( RBBB can also occur). Left axis deviation. [lifeinthefastlane.com]

There are some signs of left atrial enlargement — leftward deviation of the P wave axis (positive P waves in I and aVL, inverted in III and aVF) and prolongation of the terminal [lifeinthefastlane.com]

Right axis deviation suggests associated right ventricular hypertrophy (i.e. biventricular enlargement ). [lifeinthefastlane.com]

Left Ventricular Outflow Obstruction

ECG: Findings also may include right or left axis deviation, conduction abnormalities, sinus bradycardia with ectopic atrial rhythm and atrial enlargement. [patient.info]

[…] ventricular systolic impulse ( Table ). 10 The ECG may demonstrate evidence of left ventricular hypertrophy and QRS left axis deviation that is indistinguishable from the [circ.ahajournals.org]

[…] stenosis and are usually evidenced on physical examination by a harsh late-peaking systolic murmur, delayed and diminished peripheral pulses, and a displaced and sustained left [circ.ahajournals.org]

Congenital Aortic Valve Stenosis

References: [3] [7] [4] Diagnostics ECG Nonspecific for AS Signs of left ventricular hypertrophy (e.g., left axis deviation, positive Sokolow-Lyon index ) Chest x-ray Findings [amboss.com]

[…] of left ventricular hypertrophy, such as left ventricular enlargement and rounded heart apex, usually only in decompensated aortic stenosis, and possibly left atrial enlargement [amboss.com]

Aortic Valve Stenosis

References:[3][8][4] Diagnostics ECG Nonspecific for AS Signs of left ventricular hypertrophy (e.g., left axis deviation, positive Sokolow-Lyon index) Chest x-ray Findings [amboss.com]

deviation Left axis deviation QT Short QT syndrome T T wave alternans ST Osborn wave ST elevation ST depression Strain pattern 心肥大 Ventricular hypertrophy Left Right / Cor [zh.wikipedia.org]

[…] of left ventricular hypertrophy, such as left ventricular enlargement and rounded heart apex, usually only in decompensated aortic stenosis, and possibly left atrial enlargement [amboss.com]

Aortic Valve Insufficiency

deviation（英语：Right axis deviation） Left axis deviation（英语：Left axis deviation） QT（英语：QT interval） Short QT syndrome（英语：Short QT syndrome） T T wave alternans（英语：T wave alternans [zh.wikipedia.org]

Pulseless electrical activity（英语：Pulseless electrical activity） Sinoatrial arrest（英语：Sinoatrial arrest）其他 / 未分类 hexaxial reference system（英语：hexaxial reference system） Right axis [zh.wikipedia.org]

Progressive Familial Heart Block Type 1B

No other cause for left axis deviation is identified. Left posterior fascicular (or hemi) block Right axis deviation (mean frontal plane axis clockwise to 90°). [patient.info]

There was a left bundle branch block in both and a left axis duration in 3M and right axis deviation in NM. [jpma.org.pk]

Secondary R waves in the left ventricular leads, causing an M-shaped pattern in leads I and V4, V5 or V6. Left axis deviation may be seen. [patient.info]

Hyperkalemia

Left axis deviation. Absent P waves. Example 6 Hyperkalaemia: Sine wave appearance with severe hyperkalaemia (K+ 9.9 mEq/L). [lifeinthefastlane.com]

Obesity

axis deviation Flattening of the T wave (inferolateral leads) Left atrial abnormalities False positive criteria for inferior myocardial infarction Echocardiography In times [dx.doi.org]

Occur in Obese Individuals ↑Heart rate ↑PR interval ↑QRS interval ↑or ↓QRS voltage ↑QT c interval ↑QT dispersion ↑SAECG (late potentials) ST-T abnormalities ST depression Left [dx.doi.org]

Heart Failure

Electrocardiography demonstrated poor R-wave progression in leads V1-V3 with right axis deviation and low voltage criteria. [ncbi.nlm.nih.gov]

Echocardiography revealed diffuse left ventricular hypertrophy with normal ventricular cavity size, severe diastolic dysfunction, and sparkling and granular texture of the [ncbi.nlm.nih.gov]

Inferior Myocardial Infarction

Note pathologic Q-waves in V1-4, late R wave in V1, wide S waves in lead I, and left axis deviation (-80 degrees). [ecg.utah.edu]

deviation) Left anterior fascicular block (may see small q-waves in anterior chest leads) Acute pericarditis (the ST segment elevation may mimic acute transmural injury) [ecg.utah.edu]

[…] progression in leads V1-3) Pneumothorax (loss of right precordial R waves) Pulmonary emphysema and cor pulmonale (loss of R waves V1-3 and/or inferior Q waves with right axis [ecg.utah.edu]

Morbid Obesity

Morbid obesity is associated with liver pathology, most commonly non-alcoholic steatohepatitis (NASH) leading to cirrhosis. However, the morbid obesity impedes qualification for organ transplantation. We present a case report of a 56-year-old woman who underwent bariatric procedure followed by liver transplantation[…] [ncbi.nlm.nih.gov]

Chronic Obstructive Pulmonary Disease

Summary COPD (chronic obstructive pulmonary disease) makes it hard for you to breathe. The two main types are chronic bronchitis and emphysema. The main cause of COPD is long-term exposure to substances that irritate and damage the lungs. This is usually cigarette smoke. Air pollution, chemical fumes, or dust can[…] [medlineplus.gov]

Lenegre Disease

axis deviation (= left anterior fascicular block) First degree AV block Example 2 Incomplete Trifascicular Block: Right bundle branch block Left axis deviation (= left anterior [lifeinthefastlane.com]

axis deviation o The right ventricle depolarizes first, and this eliminates the normal septal Q waves in the lateral leads INCOMPLETE Left Bundle Branch Block - Normal QRS [derangedphysiology.com]

Natural history of marked left axis deviation (left anterior hemiblock). [ahajournals.org]

Supraventricular Tachycardia with Aberrant Conduction

The cardinal features of fascicular VT are a right bundle branch block pattern with left axis deviation and a QRS duration of 0.11 0.14 seconds. [rcemlearning.co.uk]

There is also extreme left axis deviation with small r-waves in inferior leads followed by a large S-wave, and a small q-wave in aVL with a large R-wave; this is a left anterior [epmonthly.com]

[…] aberrancy will produce either a right or left axis deviation. [emsworld.com]

Ostium Secundum Atrial Septal Defect

The 12-lead ECG will show an incomplete right bundle branch block with right axis deviation (in contrast to the priumum ASD which has a left axis deviation). [healio.com]

Sinus venosus ASD - Individuals with a sinus venosus ASD exhibit a left axis deviation of the P wave (not the QRS complex). [wikidoc.org]

axis deviation characteristic of ostium primum defects and anatomical distortion of the left bundle branch fascicles associated first degree AV block right axis deviation [radiopaedia.org]

Kidney Failure

Kidney perfusion can be acutely compromised by many factors including reduced systemic blood pressure and elevated intra-abdominal pressure. We present a case of near complete absence of kidney perfusion in a 57-year-old man with heart failure and new onset ascites. The renal perfusion defect was directly[…] [ncbi.nlm.nih.gov]

Amyloidosis

Amyloidosis refers to a group of diseases resulting from abnormal deposition of amyloids in various tissues. In patients with amyloidosis, symptoms presented are as a result of the abnormality in the function of the particular organs involved. Some of the organs that can be affected include the heart, kidney, liver,[…] [symptoma.com]

Right Atrial Hypertrophy

LAE & Left axis deviation (common but not needed to call LVH) [unm.edu]

deviation Left axis deviation QT Short QT syndrome T T wave alternans ST Osborn wave ST elevation ST depression Strain pattern Cardiomegaly Ventricular hypertrophy Left Right [en.wikipedia.org]

R wave in avl is greater then 11mm 4. left atrial enlargement 5. left axis deviation criteria for left ventricle hypertrophy 1. 1 finding (excluding number 4 or 5)= possible [quizlet.com]

Biventricular Hypertrophy

Atrial Enlargement in V1 3 points Left axis deviation 2 points QRS duration 0.09 sec 1 point Delayed intrinsicoid deflection in V5 or V6 (>0.05 sec) 1 point CORNELL Voltage [ecg.utah.edu]

Left axis deviation. [litfl.com]

anterior fascicle resulting in left-anterior hemi-block and thus results in left axis deviation. [yourarticlelibrary.com]

Diffuse Intraventricular Block

Left axis deviation is noted with left posterior fascicular tachycardia and right axis deviation with left anterior fascicular tachycardia. [rjmatthewsmd.com]

Left or right axis deviations was detected in 18 (6.8%) and 13 (4.9%) patients, respectively. [journals.plos.org]

Ostium primum atrial septal defects cause an incomplete right bundle branch block with left axis deviation. [healio.com]