In this case, the patient s blood is normally diverted to an artificial heart-lung machine to maintain the body s blood supply and gas exchange until the surgery is complete, and sinus rhythm can be restored.
32.
The M 2 muscarinic receptors are located in the heart, where they act to slow the heart rate down to normal sinus rhythm after positive stimulatory actions of the parasympathetic nervous system, by slowing the speed of depolarization.
33.
More than a decade of research went into the development of an implantable defibrillator that would automatically sense the onset of ventricular fibrillation and deliver an electric countershock within 15 20 seconds, converting the rhythm to sinus rhythm.
34.
Under normal conditions, the heart's sinoatrial node determines the rate by which the organ beats-in other words, it is the heart's " pacemaker . " The electrical activity of sinus rhythm originates in the sinoatrial node and depolarizes the atria.
35.
The normal treatments for episodes due to the pathological look-alikes are the same mainstays for any other episode of cardiac arrest : Cardiopulmonary resuscitation, defibrillation to restore normal sinus rhythm, and if initial defibrillation fails, administration of intravenous epinephrine or amiodarone.
36.
A common example would be an " interpolated PVC " ( a type of premature ventricular contraction ) during normal sinus rhythm; the PVC does not cause an atrial contraction, because the retrograde impulse from the PVC does not completely penetrate the AV node.
37.
Antiarrhythmic agents that exhibit reverse use-dependence are more efficacious at preventing a tachyarrhythmia than converting someone into normal sinus rhythm . " Because of the reverse use-dependence of class III agents, at low heart rates class III antiarrhythmic agents may paradoxically be more arrhythmogenic ."
38.
Abnormalities in the normal sinus rhythm of the heart can prevent the heart from effectively pumping blood, and are generally identified by ECG . These cardiac arrhythmias can cause an abnormal but regular heart rhythm, such as a rapid heart rate ( tachycardia, classified as Wolff-Parkinson-White syndrome.
39.
The term "'normal sinus rhythm "'( "'NSR "') is sometimes used to denote a specific type of sinus rhythm where all other measurements on the ECG also fall within designated normal limits, giving rise to the characteristic appearance of the ECG when the electrical conduction system of the heart is functioning normally.
40.
The term "'normal sinus rhythm "'( "'NSR "') is sometimes used to denote a specific type of sinus rhythm where all other measurements on the ECG also fall within designated normal limits, giving rise to the characteristic appearance of the ECG when the electrical conduction system of the heart is functioning normally.
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