ECG Ch 3

Question 1

Sinus Rhythm

Answer 1

Rhythm: intervals are regular
Rate: 60-100 b/m
P waves: upright and uniform in lead II, look alike
PR interval: 0.12 - 0.20 sec, constant from beat to beat
QRS duration: 0.11 sec or less

Question 2

Which of the following are possible causes of sinus tachycardia?

Answer 2

beverages; dehydration, hypovolemia; drugs such as cocaine, amphetamines, ecstasy, cannabis; exercise; fear and anxiety; fever; heart failure; hyperthyroidism; hypoxia; infection; medications such as epinephrine, atropine, and dopamine; nicotine; pain; pulmonary embolism

Question 3

Sinus Bradycardia

Answer 3

Rhythm: regular intervals
Rate: less than 59 b/m
P waves: positive and uniform in lead II, look alike
PR interval: 0.12 - 0.20 sec, constant
QRS duration: 0.11 sec or less

Question 4

Sinus Tachycardia

Answer 4

Rhythm: regular
Rate: ventricular ate is faster than 101 b/m max is 220 b/m minus the patients age in years
P wave: positive and uniform in lead II
PR interval: 0.12 - 0.20 sec, constant
QRS duration: 0.11 sec or less

Question 5

Management of a patient with a sinus tachycardia might include _____.

Answer 5

Treatment for sinus tachycardia is directed at correcting the underlying cause (i.e., fluid replacement, relief of pain, removal of offending medications or substances, reducing fever or anxiety).

Question 6

Sinus arrythmias

Answer 6

Rhythm: Irregular, phasic with breath, increase HR with inhale
Rate: usually 60-100 b/m
P wave: positive and uniform in lead II
PR interval: 0.12 - -0.20 se, constant
QRS duration: 0.11 sec or less

Question 7

True or False, Chest pain, Shortness of breath, and a fall in urine output are three significant signs and/or symptoms that, if observed with a sinus bradycardia, would require management of this dysrhythmia.

Answer 7

True

Question 8

Which of the following are possible causes of sinus bradycardia?

Answer 8

Causes of sinus bradycardia include disease of the SA node; hyperkalemia; hypokalemia; hypothermia; hypothyroidism; hypoxia; increased intracranial pressure; inferior myocardial infarction (MI); medications such as calcium channel blockers, digitalis, beta-blockers, amiodarone, and sotalol

Question 9

Sinus Arrest

Answer 9

Rhythm: irregular
Rate: normal but varies because of pause
P wave: when present, upright and uniform
PR interval: when present, 0.12 - 0.20 sec, constant
QRS duration: 0.11 sec or less