en Cardiology Cardiology Original Article Original Article <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="line-height:13.8pt"><b><i><span style="color:blue">Background</span></i></b><i><span style="color:blue">:</span></i> Acute pulmonary embolism can quickly cause hemodynamic collapse and death. Recent studies have shown that different characteristics of electrocardiogram (ECG) can be used to predict the prognosis of patients. This study aimed to investigate the relative frequency of fragmented QRS in the ECG of patients with pulmonary embolism and its prognostic value.</span><br> <span style="line-height:13.8pt"><b><i><span style="color:blue">Methods:</span></i></b> This study was conducted retrospectively. The files of 106 patients hospitalized with a diagnosis of pulmonary embolism from January 2016 to the end of March 2020 were selected and reviewed. The findings of the ECG, including the ST elevation in V1-V4 leads with and without T invention, right axis deviation, right bundle branch block (RBBB), PR, QRS, QTc intervals, type of treatment (thrombolysis or embolectomy), cardiogenic shock, mortality were collected. Finally, the data were recorded and analyzed in SPSS software Version 16<b>.</b></span><br> <span style="line-height:13.8pt"><b><i><span style="color:blue">Results:</span></i></b> Hypertension, dyslipidemia, and diabetes mellitus were the most frequent risk factors among the patients. The relative frequency of fragmented QRS, at least in one lead, was 26.2%. The use of thrombolysis, mechanical ventilation, embolectomy, cardiogenic shock, and in-hospital death was significantly higher among patients who had fragmented QRS (P<0.001). CTNI was significantly higher in patients with fragmented QRS (P=0.001). In patients with fragmented QRS large vessels, involvement was significantly higher. </span><br> <span style="line-height:13.8pt"><b><i><span style="color:blue">Conclusion</span></i></b><i><span style="color:blue">:</span></i> This study showed that the presence of fragmented QRS in the ECG of acute embolism patients has a significant relationship with cardiogenic shock, hospital mortality, and the need for advanced treatment methods such as intubation, embolectomy, and the use of thrombolysis. </span></span></span><br> &nbsp; Acute pulmonary embolism, Fragmented QRS, ECG, Prognosis 83 89 http://caspjim.com/browse.php?a_code=A-10-3108-2&slc_lang=en&sid=1 Mohammad Reza Dehghani mr.dehghani@gmail.com 100319475328460050507 100319475328460050507 No Department of Cardiology, Urmia University of Medical Sciences, Urmia, Iran Mansoureh Baradaran mansoureh.baradaran1342@gmail.com 100319475328460050508 100319475328460050508 No Department of Radiology, Imam Ali Hospital, North Khorasan University of Medical Sciences, Bojnurd, Iran Alireza Rostamzadeh rostamzadeh.a@umsu.ac.ir 100319475328460050509 100319475328460050509 Yes Department of Cardiology, Urmia University of Medical Sciences, Urmia, Iran Sima Masudi masudi.s@umsu.ac.ir 100319475328460050510 100319475328460050510 No Department of Biostatistics and Epidemiology, Urmia University of Medical Sciences, Urmia, Iran Amin Aghamiri aghamiri.a@umsu.ac.ir 100319475328460050511 100319475328460050511 No Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran Reza Hajizadeh hajizadh.reza@gmail.com 100319475328460050512 100319475328460050512 No Department of Cardiology, Urmia University of Medical Sciences, Urmia, Iran