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Dr Sulaiman khan, Dr Latif Ullah, Dr Muhammad Waseem Hussain. DIAGNOSTIC ACCURACY OF PROLONGED QRS COMPLEXES > 140MS ON ECG AS A PREDICTOR OF LEFT VENTRICULAR SYSTOLIC DYSFUNCTION KEEP ECHOCARDIOGRAPHY AS A GOLD STANDARD. J Popl Ther Clin Pharmacol. 2025;32(1):1217-1222. doi:10.53555/wna5en54