Which is the most common cause of ventricular fibrillation?

Which is the most common cause of ventricular fibrillation?

The cause of ventricular fibrillation is not always known but it can occur during certain medical conditions. V-fib most commonly occurs during an acute heart attack or shortly thereafter. When heart muscle does not get enough blood flow, it can become electrically unstable and cause dangerous heart rhythms.

Can stress cause ventricular fibrillation?

Chronic stress can lead to reduced heart rate variability, increased QT dispersion and reduced baroreceptor sensitivity. Patients with greatest changes in the cardiac neural regulation associated with increased sympathetic activity due to stress have the greatest risk for developing fatal ventricular arrhythmias [9].

What is the most common cause of ventricular tachycardia?

Sometimes it is not known what causes ventricular tachycardia, especially when it occurs in young people. But in most cases ventricular tachycardia is caused by heart disease, such as a previous heart attack, a congenital heart defect, hypertrophic or dilated cardiomyopathy, or myocarditis.

What is the best treatment for ventricular fibrillation?

External electrical defibrillation remains the most successful treatment for ventricular fibrillation (VF). A shock is delivered to the heart to uniformly and simultaneously depolarize a critical mass of the excitable myocardium.

What medications can cause ventricular fibrillation?

Other drugs that can cause acquired LQTS include the following:

• Tricyclic and tetracyclic antidepressants.
• Phenothiazines.
• Haloperidol.
• Antibiotics (eg, intravenous erythromycin, sulfamethoxazole/trimethoprim)
• Chemotherapeutics (eg, pentamidine, anthracycline)
• Serotonin antagonists (eg, ketanserin, zimeldine)

Can ventricular fibrillation correct itself?

Ventricular fibrillation seldom terminates spontaneously, since several re-entrant wavefronts, independent from each other, coexist, and the simultaneous extinction of all the circuits is unlikely.

How long can you live with ventricular fibrillation?

Survival: Overall survival to 1 month was only 1.6% for patients with non-shockable rhythms and 9.5% for patients found in VF. With increasing time to defibrillation, the survival rate fell rapidly from approximately 50% with a minimal delay to 5% at 15 min.

What electrolyte imbalances cause ventricular tachycardia?

Hypokalemia, hypomagnesemia, and hypocalcemia may predispose patients to either monomorphic VT or torsade de pointes.

Which is more serious atrial fibrillation or ventricular fibrillation?

Ventricular fibrillation is more serious than atrial fibrillation. Ventricular fibrillation frequently results in loss of consciousness and death, because ventricular arrhythmias are more likely to interrupt the pumping of blood, or undermine the heart’s ability to supply the body with oxygen-rich blood.

Can low potassium cause ventricular fibrillation?

Potassium levels below 3,0 mmol/l cause significant Q-T interval prolongation with subsequent risk of torsade des pointes, ventricular fibrillation and sudden cardiac death.

What is the prognosis for ventricular fibrillation?

The outlook for a person with untreated ventricular fibrillation is poor. The individual usually will die within a few minutes if untreated. Even if VFib is treated, survival rates at best range from about 20%-35%. Rates are higher if the person is taken to the hospital immediately and receives medical care.

How can ventricular fibrillation be prevented?

Treatments to prevent sudden cardiac death for those at risk of ventricular fibrillation include medications and implantable devices that can restore a normal heart rhythm.

What causes AFIB with RVR?

AFib is caused by abnormal electrical impulses in the atria (the upper chambers of the heart). In some cases, the fibrillation of the atria causes the ventricles to beat too fast. Thus the patient develops AFib with RVR. Patients having AFib with RVR experience symptoms, typically a rapid or fluttering heartbeat.

What causes V fib arrest?

Causes of ventricular fibrillation. V-fib can have several root causes, including: Insufficient blood flow to the heart muscle. Damage to the heart muscle (from a heart attack, for example) Cardiomyopathy . Problems with the aorta. Drug toxicity.

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