Sinus Rhythms

What is the heart rate in a normal sinus rhythm based on the small box method?

• 60 beats per minute

• 115 beats per minute

• 60 beats per hour

• 33 beats per minute

What characterizes a sinus bradycardia rhythm?

• Heart rate exactly 60 beats per minute

• Irregular heart rhythm

• Heart rate under 60 beats per minute

• Heart rate over 100 beats per minute

Which method is used to calculate the heart rate in sinus arrhythmia?

• Small box method

• Caliper method

• 1500 method

• 6-second strip method

What is the heart rate for sinus tachycardia?

• 60 beats per minute

• 33 beats per minute

• 115 beats per minute

• 100 beats per minute

What is a common cause for sinus tachycardia?

• Cardiac arrest

• Fever

• Normal breathing

• Sleeping

What is the characteristic feature of P waves in normal sinus rhythm?

• Upright and varied

• Inverted and varied

• Upright and uniform

• Inverted and uniform

What intervention is suggested for symptomatic sinus bradycardia?

• Immediate surgery

• Atropine or pacemaker

• No intervention required

• Exercise

How is the heart rhythm in sinus arrhythmia described?

• Fast

• Irregular

• Consistently irregular

• Regular

What is the width of the QRS complex in normal sinus rhythm?

• Under 3 boxes wide

• Over 5 boxes wide

• Exactly 5 boxes wide

• Over 3 boxes wide

What causes the irregularity in sinus arrhythmia?

• Medication

• Heart rate increases with inspiration and decreases with expiration

• Heart disease

• Physical activity