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letters S through U

Septum Myocardial muscle fiber separating the right and left chambers of the heart
Sink sinus syndrome In the broadest sense, any abnormality in sinus node impulse formation or conduction
Sinoatrial node( SA node) Spread liked conductive myocardial cells located in the upper right atrium at the base of the superior vena cava, hearts natural pacemaker, 60-100 pm, establishes normal sinus cadence of the heart
Sinus arrest Prolonged failure of the SA node to initiate impulses.
Sinus Arrhythmia Increasing and decreasing heart rate affected by respiration so. Rates remain within normal limits but increase with inspiration and decrease with expiration
Sinus block Momentary cessation of sinus impulse formation. When P-P intervals are mapped out one complete cycle will have been dropped, with spontaneous resumption of cadence
Sinus bradycardia Slowing of the sinus node impulse firing causing the heart rate to fall below 60 bpm
Sinus pause Momentary cessation of sinus impulse formation. The pause occurs for less than one complete complex. Followed by spontaneous resumption of cadence
Sinus rhythm Any rhythm in which impulse formation originates within the SA node
Sinus tachycardia Rapid firing of the SA node impulse formation, causing the heart rate to increase to 100-159 bpm
Supraventricular Sites of impulse formation above the ventricles(sinus,Antrim,and AV node). The term is often used to refer to tachyarrhythmias when the exact origin of impulse formation is not distinguishable
S wave Negative deflection following R wave, component of ventricular depolarization
Threshold The minimal amount of stimulus required to prod us a. Response. In cardiac monitoring, the amount of electrical activity required to produced myocardial devil. May be from hearts own pacemaker or artifical pacemaker
Titrate Gradual reduction in administration of medication according to type and frequency of arrhythmias and condition of patient
Trigeminy Reoccurring pattern of cardiac contraction usually premature contractions in which every third complex in the pattern is abnormal
T wave Portion of the ECG that represents ventricular repolarization. Usually of the same deflection as the R wave
Unifocal Ectopic impulses that all originate from the same place within the myocardium. The resultant complexes will look all alike
U wave Low-voltage positive deflection immediately following ventricular repolarization T-wave. It's exact significance is still under investigation, but it is thought to have some relationship to the after potential of the ventricles



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