Left axis deviation: Difference between revisions
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'''Left axis deviation''' (LAD) is a condition in which the electrical axis of the heart is deviated to the left. This is typically identified on an [[electrocardiogram]] (ECG) and is characterized by an axis that is more negative than -30 degrees. | '''Left axis deviation''' (LAD) is a condition in which the electrical axis of the heart is deviated to the left. This is typically identified on an [[electrocardiogram]] (ECG) and is characterized by an axis that is more negative than -30 degrees. | ||
[[File:Left axis dev (CardioNetworks ECGpedia).jpg|thumb|Left axis dev (CardioNetworks ECGpedia)]] [[File:RBBB with first degree AV block.jpg|thumb|RBBB with first degree AV block]] | |||
== Causes == | == Causes == | ||
Latest revision as of 19:13, 16 February 2025
Left axis deviation (LAD) is a condition in which the electrical axis of the heart is deviated to the left. This is typically identified on an electrocardiogram (ECG) and is characterized by an axis that is more negative than -30 degrees.
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Causes[edit]
Left axis deviation can be caused by a variety of conditions, including:
- Left ventricular hypertrophy
- Left bundle branch block
- Inferior myocardial infarction
- Wolff-Parkinson-White syndrome
- Congenital heart disease
Diagnosis[edit]
The diagnosis of left axis deviation is made using an electrocardiogram. The electrical axis is determined by analyzing the QRS complex in the limb leads. In left axis deviation, the QRS complex is predominantly negative in lead II and positive in lead I.
Clinical Significance[edit]
Left axis deviation itself is not a disease but rather a sign that may indicate underlying cardiac pathology. It is important for clinicians to evaluate the patient for potential causes of LAD and to assess the overall clinical context.
Management[edit]
Management of left axis deviation involves addressing the underlying cause. For example, if LAD is due to left ventricular hypertrophy, treatment may focus on managing hypertension or other contributing factors.
Related Pages[edit]
Cardiovascular disease A-Z
Most common cardiac diseases
- Cardiac arrhythmia
- Cardiogenetic disorders
- Cardiomegaly
- Cardiomyopathy
- Cardiopulmonary resuscitation
- Chronic rheumatic heart diseases
- Congenital heart defects
- Heart neoplasia
- Ischemic heart diseases
- Pericardial disorders
- Syndromes affecting the heart
- Valvular heart disease
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
A[edit]
- Accelerated idioventricular rhythm
- Acute decompensated heart failure
- Arteriosclerotic heart disease
- Athletic heart syndrome
- Atrial flutter
- Atrioventricular fistula
- Cardiovascular disease in Australia
- Autoimmune heart disease
B[edit]
C[edit]
- Ebb Cade
- Cardiac allograft vasculopathy
- Cardiac amyloidosis
- Cardiac asthma
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- Cardiogenic shock
- Cardiogeriatrics
- Cardiorenal syndrome
- Cardiotoxicity
- Carditis
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- Coronary artery anomaly
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- Cœur en sabot
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D[edit]
E[edit]
H[edit]
- Heart attack
- Heart failure
- Heart failure with preserved ejection fraction
- Heart to Heart (1949 film)
- High-output heart failure
- Hyperdynamic precordium
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
I[edit]
- Idiopathic giant-cell myocarditis
- Interventricular dyssynchrony
- Intraventricular dyssynchrony
- Isolated atrial amyloidosis
K[edit]
L[edit]
M[edit]
- Mydicar
- Myocardial bridge
- Myocardial disarray
- Myocardial rupture
- Myocardial scarring
- Myocardial stunning
- Myocarditis
N[edit]
O[edit]
P[edit]
- Papillary fibroelastoma
- Pathophysiology of heart failure
- Postpericardiotomy syndrome
- Pulmonary vein stenosis
R[edit]
S[edit]
- Saturated fat and cardiovascular disease
- SCAR-Fc
- Shone's syndrome
- Strain pattern
- Subacute bacterial endocarditis
- Sudden cardiac death of athletes
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
