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Key ECG Changes in Cardiac ConditionsHypokalaemia: %u2022 Broad flat T waves, ST depression, QT prolongation%u2022 Tall tented T waves, loss of P waves, widened QRS, sine wave pattern Hyperkalaemia:%u2022 ST-segment elevation in specific leads based on infarct location STEMI:Pulmonary Embolism: %u2022 S1Q3T3 sign