Left axis deviation: Difference between revisions

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'''Left Axis Deviation''' is a condition related to the electrical activity of the [[heart]]. It is often identified through an [[Electrocardiography|electrocardiogram]] (ECG), which measures the heart's electrical conduction system.  
'''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 ==


== Overview ==
Left axis deviation can be caused by a variety of conditions, including:


Left Axis Deviation (LAD) is a term used in the field of [[Cardiology|cardiology]] to describe the change in the electrical axis of the heart. This deviation is typically between -30 and -90 degrees. It is often associated with various cardiac conditions such as [[Left Ventricular Hypertrophy|left ventricular hypertrophy]], [[Inferior Myocardial Infarction|inferior myocardial infarction]], and [[Wolff-Parkinson-White Syndrome|Wolff-Parkinson-White syndrome]].
* [[Left ventricular hypertrophy]]
* [[Left bundle branch block]]
* [[Inferior myocardial infarction]]
* [[Wolff-Parkinson-White syndrome]]
* [[Congenital heart disease]]
 
== Diagnosis ==


== Causes ==
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.


The causes of Left Axis Deviation can be physiological or pathological. Physiological causes include [[Athletic Heart Syndrome|athletic heart syndrome]] and natural aging. Pathological causes include conditions such as [[Heart Block|heart block]], [[Cardiomyopathy|cardiomyopathy]], and [[Myocardial Infarction|myocardial infarction]].
== Clinical Significance ==


== Diagnosis ==
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.


Diagnosis of Left Axis Deviation is typically made through an [[Electrocardiogram|electrocardiogram]] (ECG). The ECG will show a deviation of the electrical axis to the left of the normal axis. Other diagnostic tests may include [[Echocardiography|echocardiography]] and [[Cardiac MRI|cardiac MRI]].
== Management ==


== Treatment ==
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.


Treatment for Left Axis Deviation depends on the underlying cause. If the deviation is due to a heart condition, treatment may include medication, lifestyle changes, or in some cases, surgery. It is important to consult with a [[Cardiologist|cardiologist]] for appropriate treatment options.
== Related Pages ==


== See Also ==
* [[Electrocardiogram]]
* [[Cardiac axis]]
* [[Left ventricular hypertrophy]]
* [[Bundle branch block]]


* [[Right Axis Deviation]]
{{Cardiology}}
* [[Electrocardiography]]
* [[Cardiology]]


[[Category:Cardiology]]
[[Category:Cardiology]]
[[Category:Medical Conditions]]
[[Category:Electrocardiography]]
{{stub}}

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.

Left axis dev (CardioNetworks ECGpedia)
RBBB with first degree AV block

Causes[edit]

Left axis deviation can be caused by a variety of conditions, including:

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

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