How is QRS Complex Evaluated in a Toxicological Emergency?
In a toxicological emergency, the QRS complex is evaluated using an electrocardiogram (ECG). Key parameters include:
Duration: A QRS duration greater than 100 ms is concerning, and more than 160 ms is considered highly predictive of severe toxicity. Morphology: The presence of a right axis deviation or terminal R wave in lead aVR can indicate TCA toxicity. Amplitude: Changes in amplitude can be indicative of electrolyte imbalances, such as hypokalemia or hyperkalemia.
