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Ventricular fibrillation (V-fib or VF) is an abnormal heart rhythm in which the ventricles of the heart quiver. [2] It is due to disorganized electrical activity. [2] Ventricular fibrillation results in cardiac arrest with loss of consciousness and no pulse. [1] This is followed by sudden cardiac death in the absence of treatment. [2]
Contraction band necrosis is a type of uncontrolled cell death unique to cardiac myocytes and thought to arise in reperfusion from hypercontraction, which results in sarcolemmal rupture. [ 1 ] It is a characteristic histologic finding of a recent myocardial infarction (heart attack) that was partially reperfused.
This hemodynamic collapse results in poor blood flow to the brain and other organs, which if prolonged causes persistent damage. There are many different types of arrhythmias, but the ones most frequently recorded in sudden cardiac arrest are ventricular tachycardia and ventricular fibrillation .
Defibrillation is a treatment for life-threatening cardiac arrhythmias, specifically ventricular fibrillation (V-Fib) and non-perfusing ventricular tachycardia (V-Tach). [1] [2] A defibrillator delivers a dose of electric current (often called a counter-shock) to the heart.
Hypertension, or abnormally high blood pressure, often signifies an elevated level of both psychological and physiological stress. Often, hypertension goes hand in hand with various atrial fibrillations including PACs. [8] Additional factors that may contribute to spontaneous premature atrial contractions could be: [4] Increased age; Abnormal ...
These signals are generated rhythmically, which results in the coordinated rhythmic contraction and relaxation of the heart. On the microscopic level, the wave of depolarization propagates to adjacent cells via gap junctions located on the intercalated disc. The heart is a functional syncytium as opposed to a skeletal muscle syncytium. In a ...
It is hemodynamically unstable and causes a sudden drop in arterial blood pressure, leading to dizziness and fainting. Depending on their cause, most individual episodes of torsades de pointes revert to normal sinus rhythm within a few seconds; however, episodes may also persist and possibly degenerate into ventricular fibrillation , leading to ...
[1] [4] An irregular rhythm indicates atrial fibrillation or atrial flutter. [1] Evidence of cardiomegaly and peripheral edema may indicate heart failure and ischemia or a valvular abnormality. [1] [4] Blood tests, especially thyroid function tests, are key baseline tests. An overactive thyroid can cause palpitations.