Does this patient have QRS axis deviation with measurements of 116°, –53°, and 153°?

QRS Axis Deviation Assessment

Yes, this patient has axis deviation—specifically, two of the three measurements show marked right axis deviation (116° and 153°), while one shows marked left axis deviation (–53°), indicating either serial ECGs with different pathology or measurement error requiring verification.

Interpretation of the Axis Measurements

According to the AHA/ACCF/HRS standardization guidelines 1, the normal adult QRS axis falls between +30° and +90°. Let me break down each measurement:

First Measurement: 116°

• Classification: Marked right axis deviation
• Falls in the range of 120° to 180° (technically just shy of "marked" at 116°, but still represents moderate right axis deviation per the 90° to 120° range) 1
• Often associated with left posterior fascicular block when marked (>120°)
• Requires evaluation for right ventricular pathology, pulmonary disease, or lateral wall myocardial infarction

Second Measurement: –53°

• Classification: Marked left axis deviation
• Beyond –45° threshold for marked LAD 1
• Strongly associated with left anterior fascicular block when between –45° and –90°
• Should prompt evaluation for left ventricular disease, inferior/lateral MI, or conduction system disease

Third Measurement: 153°

• Classification: Marked right axis deviation
• Falls clearly in the 120° to 180° range 1
• Suggests left posterior fascicular block or significant right ventricular pathology
• May indicate pulmonary disease or inferoposterior myocardial infarction 2

Clinical Significance and Next Steps

The presence of both extreme right and left axis deviations across these measurements is internally inconsistent and suggests one of three scenarios:

1. Serial ECGs from different time points showing evolving conduction disease or ischemia
2. Technical error or lead misplacement requiring repeat ECG
3. Different clinical states (e.g., exercise-induced axis shift 3)

Immediate Actions Required:

• Verify lead placement and repeat ECG to confirm which axis is current
• Review all 12 leads for bundle branch blocks, fascicular blocks, or Q waves 1
• Assess QRS duration: If ≥120 ms in adults, complete bundle branch block is present 1
• Evaluate for myocardial infarction: Axis deviation outside –45° to +75° is common with MI, especially inferoposterior or lateral wall 2
• Consider pulmonary pathology: Right axis deviation ≥+90° occurs in 20% of younger patients with pulmonary disease 2

Common Pitfalls to Avoid:

• Do not dismiss axis deviation in obese patients as merely positional—LAD in obesity likely represents true pathology, not adiposity 4
• Do not rely on axis alone—always integrate with QRS morphology, duration, and clinical context 1
• Do not overlook age-dependent norms—if this is a pediatric patient, different ranges apply (up to 120° normal in ages 8-16) 1

Risk Stratification

Both marked LAD and RAD independently predict worse outcomes in heart failure patients 5. The presence of axis deviation should trigger:

• Echocardiography to assess ventricular function and structural disease
• Evaluation for ischemic heart disease given the strong association with MI 2
• Assessment for conduction system disease requiring potential pacing evaluation

The axis deviation is definitively abnormal and mandates thorough cardiac evaluation regardless of which measurement is current 1, 6.