Cardiac syncope is due to reduction in the cardiac output
Presyncope / Near syncope –Here the patient feels dizzy, weak and tends to lose postural tone, without loss of consciousness
Reduction of cerebral blood supply for 5 sec - presyncope
Reduction of cerebral blood supply for 10 sec – loss of consciousness
Reduction of cerebral blood supply for 15 sec -seizure.
Causes of cardiac syncope are
1.Electrical abnormalities
Presyncope / Near syncope –Here the patient feels dizzy, weak and tends to lose postural tone, without loss of consciousness
Reduction of cerebral blood supply for 5 sec - presyncope
Reduction of cerebral blood supply for 10 sec – loss of consciousness
Reduction of cerebral blood supply for 15 sec -seizure.
Causes of cardiac syncope are
1.Electrical abnormalities
- Extreme bradycardia
- Heart block
- Supraventricular or ventricular tachyarrhythmia
- Aortic stenosis
- Hypertrophic obstructive cardiomyopathy
- Left atrial tumours and thrombus
- Pulmonary stenosis
- Pulmonary hypertension
- Pulmonary embolism
- Tetralogy of Fallot.
