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Tall T waves during metabolic acidosis without hyperkalemia: a prospective study
D Dreyfuss1, G Jondeau, R Couturier
1Service de Réanimation Médical, Hôpital Louis Mourier, Colombes, France.
Critical Care Medicine
|May 1, 1989
Summary
Metabolic acidosis can cause taller, peaked T waves on electrocardiograms (ECGs), even without high potassium levels. This finding helps define specific ECG characteristics for metabolic acidosis.
Area of Science:
- Cardiology
- Internal Medicine
- Electrophysiology
Background:
- Electrocardiogram (ECG) findings in metabolic acidosis are not well-defined.
- Metabolic acidosis can affect cardiac electrophysiology and may present with specific ECG changes.
Purpose of the Study:
- To prospectively define the specific ECG characteristics associated with metabolic acidosis in patients without hyperkalemia.
- To investigate the correlation between ECG changes and acid-base balance parameters.
Main Methods:
- Prospective study of 14 patients with metabolic acidosis and normal serum potassium.
- Serial ECG recordings, arterial blood gas analysis, and serum potassium measurements during acidosis and after correction.
- Statistical analysis to correlate ECG parameters with acid-base status.
Main Results:
- Metabolic acidosis was associated with significantly taller T waves in precordial leads V2 and V3 (p < .001 and p < .005, respectively).
- T wave amplitude in V2 positively correlated with arterial H+ concentration (r = .786, p < .001) and negatively with total CO2 content (r = -.71, p < .005).
- T waves exhibited a peaked, symmetrical, narrow-base ('tent-shaped') morphology during acidosis.
Conclusions:
- Metabolic acidosis can induce characteristic ECG changes, including increased T wave amplitude and a tent-shaped morphology.
- These ECG findings can be present even in the absence of hyperkalemia, aiding in the diagnosis of metabolic acidosis.