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2. Left axis deviation - Wikipedia

   en.wikipedia.org/wiki/Left_axis_deviation

   The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. 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°.

3. Lown–Ganong–Levine syndrome - Wikipedia

   en.wikipedia.org/wiki/Lown–Ganong–Levine...

   Individuals with LGL syndrome do not carry an increased risk of sudden death. The only morbidity associated with the syndrome is the occurrence of paroxysmal episodes of tachycardia which may be of several types, including sinus tachycardia, atrioventricular nodal re-entrant tachycardia, atrial fibrillation, or atrial flutter. [4]

4. Complication (medicine) - Wikipedia

   en.wikipedia.org/wiki/Complication_(medicine)

   A patient with atrial fibrillation may experience symptoms of fatigue, dizziness or lightheadedness, heart palpitations, chest pain, and shortness of breath. [7] [8] The heart does not effectively pump blood into the pulmonary or systemic vasculature, and causes the blood to remain within the chambers of the heart.

5. Supraventricular tachycardia - Wikipedia

   en.wikipedia.org/wiki/Supraventricular_tachycardia

   There are four main types of SVT: atrial fibrillation, atrial flutter, paroxysmal supraventricular tachycardia (PSVT), and Wolff–Parkinson–White syndrome. [2] The symptoms of SVT include palpitations, feeling of faintness, sweating, shortness of breath, and/or chest pain. [1]

6. Atrial septal defect - Wikipedia

   en.wikipedia.org/wiki/Atrial_septal_defect

   Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart.Some flow is a normal condition both pre-birth and immediately post-birth via the foramen ovale; however, when this does not naturally close after birth it is referred to as a patent (open) foramen ovale (PFO).

7. Mitral regurgitation - Wikipedia

   en.wikipedia.org/wiki/Mitral_regurgitation

   Mitral regurgitation, also known as mitral insufficiency or mitral incompetence, is the backward flow of blood from the left ventricle, through the mitral valve, and into the left atrium, when the left ventricle contracts, resulting in a systolic murmur radiating to the left armpit.