ECG Interpretation

• Paper speed: 25 mm/s | Gain: 10 mm/mV | Filters: 0.05-35 Hz, AC 50 Hz
• Standard calibration confirmed

Rate & Rhythm

• Heart Rate: ~75-80 bpm (estimated from RR intervals)
• Rhythm: Regular sinus rhythm
• P waves: Present and upright in leads I, II, aVF - normal sinus origin

Intervals

• PR interval: ~160-180 ms - normal (< 200 ms)
• QRS duration: ~80-100 ms - normal (narrow)
• QTc: Appears within normal limits

Axis

• QRS axis: Normal axis (positive in I and aVF)

Waveform Analysis

Key Findings & Concerns

• There is ST elevation visible in leads V2 and V3. In a patient presenting acutely, this must be taken seriously.
• Differential:
  • Anterior STEMI (LAD territory) - must be excluded urgently
  • Early repolarization variant
  • Left ventricular aneurysm
  • Pericarditis (look for PR depression, saddle-shaped ST in multiple leads)

• Bundle branch block
• Pathological Q waves (suggesting old infarct)
• Widespread ST depression
• Atrial fibrillation or significant dysrhythmia

Clinical Impression

Sinus rhythm at ~75-80 bpm with ST changes in V2-V3. In the context of a 49-year-old female admitted to a surgical hospital (trauma/joint replacement), this ECG requires immediate clinical correlation.

Recommended Actions

1. Urgent troponin (high-sensitivity, serial at 0 and 3 hours) - to rule out NSTEMI/STEMI
2. Compare with prior ECG if available - changes may be baseline/chronic
3. Clinical correlation - does the patient have chest pain, dyspnea, or hemodynamic instability?
4. Cardiology consult if troponin positive or clinical suspicion is high
5. If pre-operative ECG for joint replacement surgery: consider delaying elective surgery until cardiac cause is excluded

Disclaimer: This interpretation is AI-assisted and must be reviewed by a qualified physician. ECG findings must always be correlated with the patient's clinical presentation.

Tall R Wave + Deep S Wave in V2/V3 - Differential Diagnosis

What does this pattern mean?

Top Differentials for This ECG Pattern

1. 🔴 Right Ventricular Hypertrophy (RVH) - Most likely

• Tall R in V1/V2 with deep S in lateral leads (V5/V6)
• R > S in V1
• Right axis deviation
• In a 49F - think pulmonary hypertension, mitral stenosis, chronic lung disease
• Check: Is there right axis deviation? RAD + tall R V1/V2 = RVH until proven otherwise

2. 🔴 Posterior STEMI (Posterior MI)

• Posterior MI produces a mirror image on anterior leads
• Tall R + ST depression in V1-V3 = posterior infarction
• Pathophysiology: The posterior wall depolarizes away from V1-V3 normally (hence deep S/small R); when it infarcts, the opposing forces are lost → tall R appears
• This is a STEMI equivalent - requires urgent management
• Do a posterior ECG (V7, V8, V9) to confirm - you will see ST elevation there

3. 🟡 Wolff-Parkinson-White (WPW) Syndrome

• Delta wave + short PR + broad QRS
• Type A WPW shows tall R in V1/V2
• Look for: Short PR (<120ms), slurred QRS upstroke (delta wave)

4. 🟡 Right Bundle Branch Block (RBBB)

• RSR' pattern in V1 ("M-shaped")
• Wide QRS (>120ms)
• Deep, wide S in I, V5, V6
• Usually QRS is widened

5. 🟠 Hypertrophic Cardiomyopathy (HCM)

• Asymmetric septal hypertrophy can produce tall R in anterior leads
• Associated with deep S waves
• Look for: giant T wave inversions in lateral leads

6. 🟢 Normal variant / Counterclockwise cardiac rotation

• Heart rotated counterclockwise → precordial leads show early R wave progression
• Tall R appears earlier (in V2/V3 instead of V4/V5)
• Diagnosis of exclusion - only after pathological causes excluded

How to Differentiate - Key Questions

For THIS Patient (49F, Sainath Hospital)

• 49-year-old female
• Admitted to a trauma/joint replacement surgical unit
• Tall R + deep S in V2/V3
• Combined with the ST changes noted earlier

1. Posterior STEMI - must be excluded STAT with posterior leads and troponin
2. RVH - if she has any history of breathlessness, pulmonary hypertension, or valvular disease (mitral stenosis is common in Indian females this age)
3. WPW - check PR interval carefully

Immediate Next Step

Order posterior leads (V7-V8-V9) right now. If ST elevation seen in those leads = posterior STEMI = activate cath lab. Do NOT delay for troponin if clinically suspicious.

You're Correct - Here's Why

What I did wrong

• ST elevation in ≥ 2 contiguous leads
• Meeting voltage criteria:
  • ≥ 2.5 mm in V2-V3 in men < 40 years
  • ≥ 2.0 mm in V2-V3 in men ≥ 40 years
  • ≥ 1.5 mm in V2-V3 in women ← this patient
  • ≥ 1.0 mm in all other leads
• Clinical context - chest pain, diaphoresis, hemodynamic compromise

What ST elevation in V2-V3 ALONE (without meeting STEMI criteria) actually means

The Posterior MI point also needs correction

What the correct approach should have been

Given tall R + deep S in V2/V3 WITHOUT clinical context of chest pain or hemodynamic instability, the most appropriate primary consideration is RVH or a normal/benign variant, not MI.

Lesson

1. Clinical presentation
2. Symptoms
3. Serial ECGs
4. Biomarkers (troponin)

Honest Re-Assessment

The ST "elevation" in V2-V3 on this ECG

• The ST segment in V2-V3 shows only a very subtle upward slurring at the J-point
• It does not meet voltage criteria for significant ST elevation (recall: need ≥ 1.5 mm in women in V2-V3)
• It appears to be less than 1 mm - which is well within normal limits
• The morphology looks like a normal J-point takeoff rather than a pathological convex ST elevation

What this ST appearance most likely represents

The slight ST appearance is almost certainly a secondary repolarization change related to the dominant R/S morphology itself - not a primary ST abnormality.

Revised Summary of This ECG

Bottom Line

Patient Demographics Correction

Does the Sex Change Anything Significantly Here?

Does it Change the Tall R / Deep S Interpretation?

• RVH - still top consideration
• Normal variant / counterclockwise rotation
• Posterior MI pattern - still needs clinical correlation
• WPW Type A

One Additional Point for Males

Bottom Line - Unchanged

Normal sinus rhythm. Tall R with deep S in V2-V3 is the primary finding. No significant ST elevation by male criteria either. Clinical correlation with symptoms and echo recommended to evaluate for RVH.

What is RVH?

Normal Anatomy First

• The left ventricle (LV) is dominant - it's much thicker and heavier
• LV dominance means the net electrical vector points leftward and posteriorly
• So V1/V2 (right-sided leads) normally show small R + deep S (small forces coming toward them)

What Happens in RVH

• RV muscle mass increases significantly
• The RV electrical forces overcome the normal LV dominance
• Net vector shifts rightward and anteriorly
• Now V1/V2 see large forces coming toward them → Tall R wave
• Lateral leads (V5/V6, I, aVL) see forces moving away → Deep S waves

ECG Criteria for RVH

Causes of RVH

Pressure Overload (most common)

• Pulmonary hypertension (primary or secondary)
• Pulmonary stenosis
• Chronic lung disease - COPD, pulmonary fibrosis
• Obstructive sleep apnea

Volume Overload

• Atrial septal defect (ASD)
• Tricuspid regurgitation

Valvular

• Mitral stenosis - back pressure → pulmonary HTN → RVH
• Common in Indian patients, especially females with rheumatic heart disease

RVH vs Normal on ECG

Normal V1:    rS pattern  (small r, big S)
RVH V1:       Rs pattern  (big R, small s)

Normal V5/V6: Rs pattern  (big R)
RVH V5/V6:    RS or rS    (deep S appears)

How to Confirm RVH

1. Echocardiogram - gold standard
   • Measures RV wall thickness (> 5mm = hypertrophy)
   • Estimates pulmonary artery pressure
   • Looks for tricuspid regurgitation
2. Chest X-Ray - prominent RV, enlarged pulmonary arteries
3. Clinical history - breathlessness, leg swelling, chronic lung disease

In This Patient's Context

Why does this patient have RVH? - find and treat the underlying cause.