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IMPORTANT DISCLAIMER: This is a preliminary AI-assisted analysis for educational reference only. ECG interpretation must always be done by a qualified physician. Do not make clinical decisions based on this analysis.
ECG Analysis - Full 12-Lead
Date/Time: 2026-07-09 at 01:39 | Hospital: SMhospital
Settings: 20 mm/mV gain (DOUBLE standard), 25 mm/s paper speed, 0.05-25 Hz filter, AC 60 Hz
Critical note on gain: The machine is set at 20 mm/mV (double the standard 10 mm/mV). This means all waveform amplitudes appear twice as tall as they would on a standard ECG. All voltage measurements must be halved when comparing to normal criteria.
Rhythm - The Most Important Finding
The ECG shows two different rhythms across the strips, suggesting these may be from different time points or the initial strips were recorded during a different rhythm:
| Strip | Rhythm | Rate |
|---|---|---|
| Limb leads (aVR, aVL, aVF) | Irregularly irregular, no distinct P waves - consistent with Atrial Fibrillation | ~80-100 bpm |
| Precordial leads V1-V3 | Irregularly irregular - consistent with Atrial Fibrillation | Variable |
| Precordial leads V4-V6 | Appears more regular with P waves visible | ~80 bpm |
| Rhythm strip (last image) | Regular narrow-complex tachycardia at 150 bpm | 150 bpm |
The 150 bpm regular narrow-complex tachycardia is the most clinically significant finding. At exactly 150 bpm with narrow QRS, the top differential is:
- Atrial Flutter with 2:1 block - the classic presentation is exactly 150 bpm (flutter rate ~300 bpm, with 2:1 AV block). Look for "sawtooth" flutter waves (F waves) between QRS complexes, best seen in leads II, III, aVF and V1.
- Sinus tachycardia - less likely to be exactly 150 bpm
- Paroxysmal SVT (AVNRT/AVRT) - possible
Systematic Lead-by-Lead Analysis
Limb Leads:
- aVR: Predominantly negative QRS (rS/QS pattern) - normal for aVR. Inverted T wave - normal.
- aVL: Low amplitude, biphasic/slightly negative QRS. Flat to mildly inverted T waves.
- aVF: Predominantly positive R waves with upright T waves. No ST elevation or depression.
Precordial Leads (V1-V3):
- V1: rS pattern (small r, deep S) - normal. T wave flat to shallow inversion - normal variant.
- V2: rS pattern with slightly larger r wave. Upright T waves.
- V3: Transitional RS morphology with increasing R wave - normal R-wave progression.
- ST segments V1-V3: No diagnostic elevation or depression.
Precordial Leads (V4-V6):
- V4: Tall R wave, minimal S wave (Rs or qR morphology). Isoelectric ST segment. Upright asymmetric T waves.
- V5: Tall R wave with small septal q-wave. Normal.
- V6: Slightly lower R amplitude than V5 (normal drop-off).
- No ST elevation or depression in lateral leads.
Key Findings Summary
| Parameter | Finding |
|---|---|
| Primary rhythm | Atrial Fibrillation vs. Atrial Flutter with 2:1 block (rate 150 bpm) |
| QRS width | Narrow (<120 ms) - normal intraventricular conduction |
| R-wave progression | Normal (V1 to V6) |
| ST changes | No acute ST elevation or depression in any lead |
| T waves | No hyperacute T waves, no deep symmetric inversions |
| Voltage | Appears tall but machine is at 2x gain - actual voltage is likely normal |
| Axis | Appears normal (positive in aVF, negative in aVR) |
Clinical Impression
The most significant abnormality is the tachyarrhythmia at 150 bpm. Given:
- Regular rate at exactly 150 bpm
- Narrow QRS complexes
- History of what appears to be atrial fibrillation in other leads
Atrial Flutter with 2:1 AV block is the primary consideration. This requires urgent evaluation by a cardiologist. Flutter waves at 300 bpm may be visible as small "sawtooth" deflections between QRS complexes, especially in the inferior leads (II, III, aVF).
No acute STEMI pattern or Brugada-type changes are identified on this tracing.
Please have this ECG reviewed urgently by a cardiologist or emergency physician. A heart rate of 150 bpm with possible atrial flutter requires prompt assessment and likely rate/rhythm control therapy.
Treatment opd basis
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IMPORTANT: This information is for physician reference only. Prescribing decisions must be made by a qualified clinician who has examined the patient.
OPD Treatment Plan - Atrial Flutter/AF with Tachycardia at 150 bpm
Based on the ECG showing a regular narrow-complex tachycardia at 150 bpm (most consistent with Atrial Flutter with 2:1 block), here is the evidence-based OPD management:
Step 1 - Assess Before Discharge / OPD Initiation
Before treating as OPD, confirm ALL of the following:
- Hemodynamically stable (BP at baseline, SpO2 >95% on room air, no chest pain/dyspnea)
- No evidence of acute HF, active ischemia, or hypotension
- Ventricular rate controlled to <100 bpm at rest before discharge
If the patient is symptomatic or hemodynamically unstable - refer to emergency/cardiology, do not treat OPD.
Step 2 - Rate Control Medications (Choose One)
| Drug | Dose | Notes |
|---|---|---|
| Diltiazem (preferred) | 60-90 mg PO four times daily (immediate release) | More effective than metoprolol for rate control; adjust as needed |
| Metoprolol | 25-50 mg twice daily (immediate release) | Avoid if HFrEF (reduced ejection fraction); transition to extended-release once dose established |
| Digoxin | 0.25 mg OD | Second-line; consider if beta-blocker/CCB contraindicated or in HF |
Target resting heart rate: <100 bpm (rate control strategy)
- Washington Manual of Medical Therapeutics, p. 237
Step 3 - Anticoagulation (Stroke Prevention)
Atrial flutter carries a similar thromboembolic risk to AF. Use the CHA2DS2-VASc score to decide:
| Score | Action |
|---|---|
| 0 | Anticoagulation not recommended |
| 1 | Anticoagulation optional (discuss risk/benefit) |
| ≥2 | Oral anticoagulation recommended |
CHA2DS2-VASc scoring:
- C - Congestive heart failure (+1)
- H - Hypertension (+1)
- A2 - Age ≥75 (+2)
- D - Diabetes (+1)
- S2 - Stroke/TIA history (+2)
- V - Vascular disease (+1)
- A - Age 65-74 (+1)
- Sc - Sex (female) (+1)
Anticoagulation options:
-
Apixaban 5 mg BD (or 2.5 mg BD if ≥2 of: age ≥80, weight ≤60 kg, creatinine ≥1.5 mg/dL) - preferred NOAC
-
Rivaroxaban 20 mg OD with evening meal
-
Warfarin (INR 2-3) - if NOACs unavailable or valvular AF
-
Tintinalli's Emergency Medicine, p. Table 18-13/18-14
Step 4 - Definitive Treatment Referral
Atrial flutter is very amenable to cure. Refer to cardiology for:
- Radiofrequency Catheter Ablation (RFA) - >90% long-term success rate for typical right AFL with very low complication rate. This is the preferred definitive treatment.
- Outpatient echocardiogram - to rule out structural heart disease, assess LV function, check for valvular disease.
- Thyroid function tests (TSH) - hyperthyroidism is a common reversible cause.
- Electrolytes - check K+, Mg2+ (hypokalemia/hypomagnesemia are common precipitants).
- Fuster and Hurst's The Heart 15th Ed., Chapter 36
Summary Prescription at OPD Discharge
1. Tab Diltiazem CD 90 mg OD or BD (adjust per HR response)
OR Tab Metoprolol succinate 25-50 mg OD
2. Anticoagulation as per CHA2DS2-VASc score
(e.g., Tab Apixaban 5 mg BD if score ≥2)
3. Follow-up with cardiologist within 7 days
4. Echocardiogram (outpatient)
5. Labs: CBC, TFT, RFT, electrolytes, blood glucose
6. Return to ED if: palpitations worsen, dizziness, chest pain,
breathlessness, or near-syncope
Prescription quantity should be only sufficient to last until follow-up. Definitive rhythm control (catheter ablation) should be discussed with cardiology, as it offers >90% cure rate for typical atrial flutter and eliminates the need for long-term rate control and anticoagulation.
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