الفهرس 
COVID-19 and its pathophysiologyOnly 14 pages are availabe for public view
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Abstract
In the present study we aimed at finding the prognostic value of R-wave voltage diminution among confirmed COVID-19 patients.
Low electrocardiographic QRS voltage (LQRSV) is traditionally defined by zenith-to-nadir QRS amplitudes of the QRS complexes of less than 0.5 mV in all the frontal leads and less than 1.0 mV in all the precordial leads.
This study included 150 patients; divided into two groups. The first group is with positive PCR for COVID-19 and normal ECG on admission (group A) while the second group is with positive PCR for COVID-19 and R wave voltage diminution on admission (group B).
Patients among both groups were followed up regarding their outcome whether discharge, transferal or death. New cardiac events or occurrence of other system affection was also monitored.
Any new cardiac event was diagnosed by the necessary investigation whether electrocardiogram, echocardiography, diagnostic catheterization. In addition to performing the necessary labs including Troponin I and CKMB.
Prevalence of echocardiographic abnormalities and the impact of their presence was documented among all patients included in the study.
Mortality occurred significantly in (34.7%) within patients with R-wave voltage diminution compared with (13.3%) of patients without R-wave voltage diminution (p = 0.002).
Echocardiographic abnormalities were prevalent among both groups and they were found to be a significant cause of mortality especially in patients having valvular abnormalities and chamber enlargement.
group B patients had more cardiac complications and longer length of hospital stay.
Elevated Troponin I and CKMB were found to be significant predictors of mortality, associated with worse prognosis.
QRS voltage diminution was associated with more mortality and cardiac complications in patients hospitalized with COVID-19