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"QTc prolongation" AND torsades
These aren't directly relevant unless there's a specific drug context, so I won't force them in. Now I'll give the full interpretation.
What this printout shows
This is a standard 12-lead ECG (limb leads I, II, III, aVR, aVL, aVF plus precordial V1-V6, run at the usual 10 mm/mV calibration), from an adult patient (BP recorded as 130/90 mmHg). The machine's auto-measurements printed on the strip are:
| Parameter | Value | Comment |
|---|---|---|
| QT / QTc | 403 / 480 ms | QTc markedly prolonged (normal upper limit ~440-460 ms men, ~450-470 ms women) |
| P / QRS / T axis | 73° / -60° / 73° | QRS axis -60° = significant left axis deviation (normal range roughly -30° to +90°) |
| RV5, SV1 | 0.89 mV, 1.28 mV | Individual precordial voltages |
| RV5 + SV1 (Sokolow-Lyon index) | 2.17 mV | Below the 3.5 mV (35 mm) threshold, so voltage criteria for LVH are not met by this index |
| Rotation | "121 Clockwise Rotation" | Delayed R-wave transition in the precordial leads (transition beyond V4), consistent with what the tracing shows - small R waves in V1-V3 that only grow prominent by V5-V6 |
| Machine flag | "SUSPECTED ABNORMAL ECG" | Auto-generated, explicitly requires physician confirmation ("The result must be confirmed by doctor") |
Note: the top portion of the report (where heart rate, PR interval, and QRS duration are usually printed) is cropped out of the photo, so I can't confirm the exact rate or PR/QRS duration from the numbers alone - only from the visual tracing, which shows a fairly regular narrow-QRS rhythm.
Clinical interpretation
1. Prolonged QTc (480 ms) - the most important finding. A QTc this long crosses into the range associated with increased risk of torsades de pointes and ventricular arrhythmia. Per Goldman-Cecil Medicine, borderline QTc is 440-479 ms, and 480 ms is frankly prolonged. This warrants:
- Checking electrolytes (K+, Mg2+, Ca2+)
- Reviewing all medications for QT-prolonging drugs (many antiarrhythmics, antipsychotics, antiemetics, certain antibiotics/antifungals)
- Asking about personal/family history of unexplained syncope or sudden cardiac death (to exclude congenital long QT syndrome)
- Repeating the ECG to confirm, since a single automated QTc measurement can be affected by T-wave shape or U-wave inclusion errors
2. Left axis deviation (QRS axis -60°). This is more negative than the normal cutoff of -30°, i.e., significant LAD. Common causes include left anterior fascicular block, LVH, prior inferior MI, or hyperkalemia. Given the borderline/elevated BP (130/90), hypertensive heart disease is a reasonable consideration, though the Sokolow-Lyon voltage index here (2.17 mV) does not itself meet LVH criteria - LVH cannot be confirmed or excluded on voltage alone, and if there's clinical suspicion, other criteria (Cornell voltage, echocardiography) would be needed.
3. Clockwise rotation / delayed precordial transition. The R/S transition point in the precordial leads appears late (around V4-V5 rather than the usual V3-V4). This can be a normal variant, but Goldman-Cecil notes that a late transition zone "may portend a higher risk of future coronary [disease]" - so in isolation it is nonspecific but worth correlating clinically.
4. Elevated BP (130/90 mmHg). By ACC/AHA staging, a diastolic of 90 mmHg alone qualifies as Stage 2 hypertension, which is relevant background given the axis and voltage findings above.
Bottom line
The machine has auto-flagged this as an abnormal ECG, and the report itself states the result must be confirmed by a physician - that instruction should be followed literally. The main actionable abnormality is the prolonged QTc (480 ms), which deserves prompt clinical correlation (electrolytes, medication review, symptom/family history), plus follow-up on the left axis deviation and hypertension. I can't assess rhythm/rate details hidden by the cropped header or make a definitive diagnosis from a photo of a paper strip - a treating physician or cardiologist should review the original tracing directly, ideally with calipers and the full header data, before any clinical decision is made.
Having only chest pain
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chest pain evaluation prolonged QTc left axis deviation ECG acute coronary syndrome workup guidelines
Given that chest pain is the only symptom (no dyspnea, palpitations, syncope, or diaphoresis mentioned), here's how that changes the picture for this ECG:
Does this ECG show classic ischemia?
From what's visible on the strip, I don't see obvious ST-segment elevation or depression, or new pathologic Q waves - the flagged abnormalities are the prolonged QTc (480 ms), left axis deviation (-60°), and clockwise/late R-wave transition. None of these are the classic ECG signature of an acute STEMI. However, this is a critical point from the literature I checked:
- A normal or non-diagnostic ECG does not rule out acute coronary syndrome. Per Harrison's and Medscape's ACS workup guidance, "a normal ECG or one that remains unchanged from baseline does not exclude the possibility that chest pain is ischemic in origin" - roughly 1-4% of patients ultimately diagnosed with MI can have an unremarkable initial ECG.
- Current guidelines (2021 AHA/ACC/ASE/CHEST/SAEM/SCCT/SCMR Chest Pain Guideline, reaffirmed in the ACC/ACEP/AHA/SCAI ACS guideline) recommend that anyone with suspected ACS whose initial ECG is non-diagnostic get:
- High-sensitivity troponin measured as soon as possible (and repeated per a rapid rule-out/rule-in protocol, e.g., 0h/1h or 0h/2h)
- Serial 12-lead ECGs, especially if symptoms persist or clinical suspicion is high
- Clinical risk stratification (e.g., HEART score) factoring in age, risk factors, and exam
Why "chest pain only" still matters here
A few things on this specific tracing make me want this correlated urgently rather than dismissed as incidental:
- Ischemia itself can prolong the QT interval. Acute coronary ischemia is a recognized cause of secondary QTc prolongation (along with electrolyte disturbance, which can also independently cause chest discomfort in some patients - e.g., hypokalemia or hypocalcemia).
- Elevated BP (130/90) plus left axis deviation raises the possibility of hypertensive heart disease, though the LVH voltage index here was negative - this needs correlating with the patient's actual cardiac risk profile (age, diabetes, smoking, lipids, prior CAD).
- The machine itself flagged "SUSPECTED ABNORMAL ECG" and explicitly requires physician confirmation - that shouldn't be skipped just because the pattern isn't a textbook STEMI.
Practical next step
Chest pain with a machine-flagged abnormal ECG (prolonged QTc + axis deviation) should not be worked up from a photo alone. The standard, safe pathway is:
- Immediate/same-visit troponin (preferably high-sensitivity, serial if first is equivocal)
- Serial ECGs (repeat in 15-30 min or with any change in symptoms)
- Basic metabolic panel including potassium, magnesium, calcium (relevant both to the QTc and possible cause of the pain)
- Physician/cardiologist review of the actual original tracing (not the photo) for rate, rhythm, PR/QRS duration that were cropped out of what I could see
- If pain is ongoing, worsening, exertional, or associated with any autonomic symptoms (sweating, nausea, radiation to arm/jaw), this should be treated as a possible ACS presentation and evaluated emergently rather than electively.
I can't tell you from this image alone whether the chest pain is cardiac - that requires troponin, serial ECGs, and clinical exam that only an in-person evaluation can provide. Given the abnormal flag, the safer course is urgent evaluation rather than reassurance.
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