Technical Details

• Machine: GE MAC2000
• Paper speed: 25 mm/s
• Gain: 10 mm/mV (standard)
• Filter: 0.56-20 Hz, 50 Hz notch

Systematic Interpretation

Rate

• Approximately 60-75 bpm (regular R-R intervals). The rhythm appears regular.

Rhythm

• Regular sinus rhythm - P waves are present and precede each QRS complex with a consistent relationship.

Axis

• Lead I appears upright, aVF appears upright - normal axis (roughly 0° to +90°).

P Waves

• Present, upright in leads I, II, aVF. Inverted in aVR (as expected).
• Morphology appears normal - no evidence of P mitrale or P pulmonale.
• P wave duration and amplitude appear within normal limits.

PR Interval

• Appears approximately 160-180 ms (within normal range, upper limit of normal).

QRS Complex

• Duration appears narrow (<120 ms) - no bundle branch block pattern.
• No pathological Q waves clearly identified in the inferior or lateral leads.
• In V1-V2: rS morphology (normal).
• R-wave progression across precordial leads appears to transition normally around V3-V4.

ST Segments

• No obvious ST elevation or depression in any lead.
• ST segments appear isoelectric across the limb and precordial leads.

T Waves

• T waves appear upright in I, II, aVF, and V4-V6.
• T wave in aVR is inverted (normal).
• V1-V3 show small/flat to mildly inverted T waves, which can be a normal variant, particularly in V1-V2.

QT Interval

• Visually appears within normal range for the heart rate (QTc likely ≤440 ms), though precise measurement requires calipers.

Notable Features

• No delta waves (no pre-excitation pattern).
• No evidence of left ventricular hypertrophy (LVH) voltage criteria met on initial inspection.
• No Brugada pattern in V1-V2.
• The machine header notes "Unconfirmed" - meaning the automated interpretation has not been verified by a clinician.

Summary / Impression

Normal sinus rhythm, normal axis, no acute ischemic changes. No ST elevation/depression, no pathological Q waves, narrow QRS, normal intervals. This ECG appears within normal limits.