Ecg diagnosis
Looking at this ECG strip from the ACLS Precourse Self-Assessment, here is my analysis:
ECG Findings:
- Rate: Approximately 60-75 bpm (complexes appear regularly spaced)
- Rhythm: The R-R intervals look irregular - they vary in spacing across the strip
- P waves: No clearly identifiable, organized P waves before each QRS complex. The baseline between complexes appears chaotic/fibrillatory rather than flat
- QRS complexes: Narrow, appearing normal in morphology
- Key feature: Irregularly irregular rhythm with no discernible P waves
Diagnosis: Atrial Fibrillation (AFib)
The classic hallmarks visible here are:
| Feature | Finding |
|---|---|
| Rhythm | Irregularly irregular |
| P waves | Absent - replaced by fibrillatory baseline |
| QRS | Narrow (normal ventricular conduction) |
| Rate | Controlled ventricular response (~60-80 bpm) |
Why not the other options?
- Agonal rhythm/asystole - Agonal rhythm shows very slow, wide, bizarre complexes with near-flatline. This strip has regular-looking narrow QRS complexes at a normal rate, ruling that out.
Answer: Atrial Fibrillation
The irregularly irregular spacing of the QRS complexes combined with the absence of organized P waves and fibrillatory baseline is the textbook presentation of AFib - one of the most commonly tested rhythms on ACLS assessments.
This is a shared conversation. Sign in to Orris to start your own chat.