ECG Intervals and Rhythm Overview
Sinus rhythm is present with a ventricular rate of 92 bpm, and atrioventricular conduction is within expected limits based on the PR interval. [1] The QRS duration is normal at 78 ms. [2] The corrected QT interval (QTc) is 431 ms, which is not prolonged by standard QTc thresholds used to define prolonged QT. [3]
Heart Rate and Sinus Rhythm
A heart rate of 92 bpm with sinus rhythm indicates a normal rhythm origin at the sinoatrial node. [1]
Atrioventricular Conduction (PR Interval)
The PR interval of 164 ms is within the usual adult reference range of approximately 120 to 200 ms. [4] No first-degree atrioventricular block is indicated by the PR interval length. [4]
Ventricular Conduction (QRS Duration)
The QRS duration of 78 ms is normal because it is <120 ms. [2]
Repolarization (QTc Interval)
The QTc of 431 ms is below commonly used prolonged QT thresholds (460 ms in women and 450 ms in men) in standard interpretation guidance. [3] This value therefore does not meet criteria for QTc prolongation. [3]
Additional Interval Fields Provided
The reported “PQRS/T intervals 45/44/42 ms” and “RV5/SV1 amplitude ratios 0.614/0.453” require the exact ECG measurement definitions and lead placement/context to map to a specific clinical criterion. Clinical interpretation should rely on the printed ECG with waveform morphology, measured QT (not only device-derived QTc), and the machine’s diagnostic statements. [3]
Clinical Correlation and Safety Checks
Medication review for QT-prolonging agents and electrolyte assessment (potassium, magnesium, and calcium) are appropriate when QTc is being evaluated. [3] Repeat ECG with consistent measurement conditions is appropriate when QTc is near decision thresholds or when the clinical context changes. [3]