What causes electromechanical dissociation?
Factors such as internal hemorrhage, acute cardiac tamponade, tension pneumothorax, acute pulmonary embolism, and inflow or outflow obstructions of the heart may be responsible for changes in loading. Myocardial ischemia, myocardial depressant overdose, and other conditions may also contribute to secondary EMD.
What is electromechanical dissociation?
Electromechanical dissociation (EMD) implies organized electrical depolarization of the heart without synchronous myocardial fiber shortening and, therefore, without cardiac output.
What are the possible causes of Pulselessness?
Various causes of pulseless electrical activity include significant hypoxia, profound acidosis, severe hypovolemia, tension pneumothorax, electrolyte imbalance, drug overdose, sepsis, large myocardial infarction, massive pulmonary embolism, cardiac tamponade, hypoglycemia, hypothermia, and trauma.
What causes pulseless ventricular tachycardia?
Pulseless ventricular tachycardia (VT) can result from a multitude of causes and predisposing conditions, including but not limited to, structural heart disease, electrolyte disturbances, drugs/medications, and congenital/inherited channelopathies.
How does hypoxia cause PEA?
PEA is always caused by a profound cardiovascular insult (eg, severe prolonged hypoxia or acidosis or extreme hypovolemia or flow-restricting pulmonary embolus). The initial insult weakens cardiac contraction, and this situation is exacerbated by worsening acidosis, hypoxia, and increasing vagal tone.
What is PEA arrhythmia?
Cardiology. Pulseless electrical activity (PEA) refers to cardiac arrest in which the electrocardiogram shows a heart rhythm that should produce a pulse, but does not. Pulseless electrical activity is found initially in about 55% of people in cardiac arrest.
What is a PEA arrhythmia?
What electrolyte imbalance causes ventricular tachycardia?
Hypokalemia, hypomagnesemia, and hypocalcemia may predispose patients to either monomorphic VT or torsade de pointes.