In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II. Common causes...
Most common diseases
Obesity
axis deviation Flattening of the T wave (inferolateral leads) Left atrial abnormalities False positive criteria for inferior myocardial infarction Echocardiography In times [doi.org]
That May 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 [doi.org]
Hyperkalemia
Left axis deviation. Absent P waves. Example 6 Hyperkalaemia: Sine wave appearance with severe hyperkalaemia (K 9.9 mEq/L). Example 7 Hyperkalaemia: Huge peaked T waves. [lifeinthefastlane.com]
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]
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]
Hypertrophic Cardiomyopathy
ECG: Findings also may include right or left axis deviation, conduction abnormalities, sinus bradycardia with ectopic atrial rhythm and atrial enlargement. [patient.info]
axis deviation, and deep, narrow so-called "needle-like" q waves, typically in leads I, L, V5 and V6. [radiopaedia.org]
[…] over 95% of cases; the most common abnormalities include high precordial QRS voltages, secondary repolarization abnormalities (ST segment depression, T wave inversion), left [radiopaedia.org]
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]
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]
In ostium primum ASD, it shows left axis deviation and right bundle branch block. In sinus venosus ASD, it shows left axis deviation and a negative P wave in lead III. [symptoma.com]
When an ostium primum atrial defect is present, the ECG reveals left axis deviation. [healio.com]
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]
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. [ipfs.io]
Each ECG showed persisting left axis deviation with no new conduction abnormalities. [circ.ahajournals.org]
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]
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]