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ECG Made Easy, Ch. 3

Sinus Mechanisms

QuestionAnswer
The normal duration of the PR interval 0.12 to 0.20
Commonly associated with an inferior or posterior myocardial infarction Sinus bradycardia
The portion of the ECG tracing between the QRS complex and the T wave ST-segment
On an ECG, what is the first negative deflection seen after the P wave? Q wave
The period during the cardiac cycle when cells cannot respond to a stimulus, no matter how strong absolute refractory
In the heart’s conduction system, the ____________ receive(s) an electrical impulse from the bundle of His and relays it to the Purkinje fibers in ventricular myocardium. right and left bundle branches
Lead II, III, and aVF view the _________ surface of the heart. inferior
Normal QRS duration in an adult 0.06 to 0.10
Sinus arrest is a disorder of __________. automaticity
Dysrhythmia with a pause of undetermined length that is not the same distance as other P-P intervals. Sinus arrest
Rate associated with a sinus bradycardia Less than 60 beats/min
SA block is a disorder of ___________. conductivity
Dysrhythmia that originates from the SA node and has a ventricular rate of 101 to 180 beats/min. Sinus tachycardia
Appearance of P waves that originate from the SA node. Smooth, rounded, upright
Cardiac output Stroke volume x heart rate
Pacemaker with an intrinsic rate of 20 to 40 beats/min Purkinje fibers/ventricles
Normal rate for a sinus rhythm 60 to 100 beats/min
This medication may be used to increase heart rate if the QRS is narrow and the patient is symptomatic because the rate is slow. Atropine
Dysrhythmia with a pause that is the same as (or an. exact multiple of) the distance between two other P-P intervals. SA block
Medications that may be administered to slow the heart rate and decrease myocardial oxygen demand. Beta blockers
Common Dysrhythmia associated with respiratory rate. Sinus arrhythmia
If the SA node fails to generate an impulse, the next (escape) pacemaker that should generate an impulse. AV junction
Any disturbance or abnormality in a normal rhythmic pattern Dysrhythmia
sinus rhythm - rate? 60 to 100 beats/min
sinus rhythm - Rhythm? regular
sinus rhythm - P waves? appearance, upright or positive in lead II, one p wave before each QRS
Sinus rhythm - PR interval (PRI) 0.12 to 0.20 seconds and constant
sinus rhythm - QRS? 0.10 seconds or less
What is the most important difference between sinus rhythm and sinus bradycardia? The rate of sinus bradycardia has a rate of less than 60 beats/min, whereas sinus rhythm has a rate of 60 to 100 beats/min.
What is the most important difference between sinus rhythm and sinus tachycardia? Sinus rhythm has a rate of 60 to 100 beats/min. Sinus tach has a rate of 101 to 180 beats per minute.
What is the most important difference between sinus rhythm and sinus arrhythmia? Sinus rhythm has a regular atrial and ventricular rhythm. With a sinus arrhythmia, the SA node fires irregularly, causing an irregular atrial and ventricular rhythm.
List five (5) signs or symptoms of hemodynamic compromise. 1. Changes in mental status (restlessness, confusion, possible loss of consciousness). 2. Low bp 3. Chest pain 4. Shortness of breath 5. Signs of shock 6. CHF 7. Pulmonary congestion 8. Fall in urine output 9. Cold, clammy skin
List five (5) causes of sinus tachycardia. 1. Exercise 2. Fever 3. Pain 4. Fear 5. Hypoxia 6. CHF 7. Acute MI 8. Infection 9. Sympathetic stimulation 10. Shock 11. Dehydration 12. Pulmonary embolism 13. Hyperthyroidism 14. Meds: epi, atropine, dopamine 15. Caffeine 16.Nicotine/drugs
Created by: djoyo14
 

 



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