A 65-year-old male is experiencing sudden onset of weakness, dizziness, and a feeling of 'fluttering' in his chest. His radial pulse is rapid, irregular, and difficult to count, estimated at 140 bpm. His skin is warm and dry, and blood pressure is 110/70 mmHg. He denies chest pain or shortness of breath. What type of dysrhythmia is MOST likely based on this presentation?
- AVentricular tachycardia
- BSinus bradycardia
- CVentricular fibrillation
- DAtrial fibrillation with rapid ventricular response
Show answer & explanationAnswer & explanation
Correct answer: D. Atrial fibrillation with rapid ventricular response
The patient's symptoms of rapid, irregular pulse (estimated 140 bpm), and a 'fluttering' sensation in the chest, without signs of severe instability (like hypotension below 90 mmHg or altered mental status), are highly suggestive of atrial fibrillation with a rapid ventricular response (RVR). Ventricular fibrillation would present as cardiac arrest, and ventricular tachycardia would typically be regular, though it can be irregular. Sinus bradycardia is a slow regular rhythm.
Why the other options are wrong
- A. Ventricular tachycardia is typically a rapid, *regular* rhythm, though it can be irregular. The 'irregularly irregular' quality points more towards Afib RVR in this stable patient.
- B. Sinus bradycardia is a slow (less than 60 bpm) and regular rhythm, which contradicts the patient's rapid, irregular pulse.
- C. Ventricular fibrillation is a chaotic rhythm leading to cardiac arrest, presenting as unresponsive and pulseless.
Atrial Fibrillation (Afib) Recognition
Atrial fibrillation is a common cardiac dysrhythmia characterized by disorganized electrical activity in the atria, leading to an irregularly irregular ventricular response.
- Rapid, irregularly irregular pulse.
- Palpitations ('fluttering' sensation).
- Can lead to dizziness, weakness, fatigue.
- Risk of stroke due to clot formation in the atria.
Memory trick: Irregularly irregular, atrial flutter's a blur!