Which of the following are rules for atrial fibrillation? Select all that apply
Rhythm: Irregularly irregular
P waves: No identifiable P waves
PR interval: Measurable
Heart rate: Atrial rate not measurable
QRS interval: <0.10 seconds
Correct Answer : A,B,D
A. Irregularly irregular: Atrial fibrillation is characterized by an irregularly irregular rhythm.
B. No identifiable P waves: P waves are typically absent in atrial fibrillation or may be difficult to identify.
C. PR interval is not typically measured in atrial fibrillation as it is not relevant to the rhythm.
D. Atrial rate not measurable: The atrial rate in atrial fibrillation is not measurable due to the rapid and irregular nature of the rhythm.
E. QRS interval is typically normal in atrial fibrillation and does not exceed 0.10 seconds.
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Related Questions
Correct Answer is A
Explanation
A. The P wave on an ECG represents atrial depolarization, which occurs as the electrical impulse originates in the sinoatrial (SA) node and spreads through the atria, initiating atrial contraction.
B. Atrial repolarization typically occurs during the QRS complex and is not represented by the P wave. Atrial repolarization is masked by the larger QRS complex.
C. Ventricular depolarization is represented by the QRS complex on an ECG, as the electrical impulse spreads through the ventricles, leading to ventricular contraction.
D. Ventricular repolarization typically occurs during the T wave and is not represented by the P wave. Ventricular repolarization involves the recovery of ventricular muscle cells after contraction.
Correct Answer is D
Explanation
A. Energy drinks containing caffeine can exacerbate palpitations and should be avoided.
B. Alcohol, including red wine, can trigger or worsen palpitations and should be limited or avoided.
C. Potassium-rich foods are not typically associated with palpitations. In fact, maintaining normal potassium levels is important for heart health.
D. Caffeine can trigger palpitations in susceptible individuals, so switching to decaffeinated coffee may help reduce symptoms.
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