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Radiological and clinical improvement in a patient with COVID-19 pneumonia postconvalescent plasma transfusion: A case report

Currently, there are no approved specific antiviral agents for novel coronavirus disease 2019 (COVID-19). Convalescent plasma has not yet been approved for use in patients with COVID-19 infection; however, it is regulated as an investigational product. This is a case report of a 55-year-old male, with COVID-19 pneumonia who has received convalescent plasma as part of a treatment plan which showed significant radiological and clinical improvement post-treatment.


Introduction
The pandemic caused by the novel coronavirus, called COVID-19, was first reported in China in December 2019 followed by widespread into all other countries in the world. It is affected by more than 6 million people around the world [1] .
COVID-19 clinical spectrum varies from asymptomatic or mild symptoms in most of the cases to severe acute respiratory syndrome, which may lead to death.
There is no vaccine yet available to protect from the infection as well as no specific effective treatment has been found. That's why all therapeutic options for COVID-19 infection need to be discussed scientifically.

Case report
This is a case report of a 55-year-old male, previously healthy and nonsmoker.
He presented with a history of 5 days' fever and cough associated with shortness of breath and chest pain. The patient is living with 20 persons in the same room and some of them had a fever.
On ED O2 sat was 77% on room air, improved to 91%-97% on 5L NC however still tachypneic.
Labs showed a positive RT-PCR for COVID-19, high inflammatory markers CRP 229 mg/L, and a high ferritin level of 749 ug/L. Chest x-ray (CXR) ( Fig. 1 ) shows bilateral opacities with ARDS pattern, initial chest CT scan ( Fig. 2 ) confirmed the findings and revealed widespread central and peripheral patchy mixed bilateral ground-glass opacities with consolidations a crazy-paving pattern which are classical findings in COVID-19 pneumonia, graded as severe according to the British Society of Thoracic Imaging. Favipiravir and Hydroxychloroquine were initiated.
The patient was transferred to ICU after 4 days with acute hypoxic respiratory failure secondary to severe COVID-19 pneumonia required intubation, mechanical ventilation, and placed on Enoxaparin 40 mg SC BID.
The patient has received convalescent plasma effusion after being consented to participate in a clinical trial as fulfilling the eligibility criteria.
About 300 mL convalescent plasma from recovered COVID-19 patient was transfused over 1 hour, premedications with 1-g paracetamol IV, and 50 mg IV diphenhydramine were administered.
The patient was monitored for any reaction posttransfusion. No significant adverse effects were observed.
There was a significant radiological and clinical improvement in a few days' postconvalescent plasma transfusion. Postplasma transfusion, CXRs showed gradual improvement starting from day 2, patient was extubated on day 6 ( Fig. 3 ). Chest CT scan was done on day 12 which showed significant improvement ( Fig. 4 ) and patient was discharged at the same day.

Discussion
Convalescent plasma transfusion has been used as a possible passive immunotherapy treatment option for moderate to severe cases [1 ,2] .
The administration of convalescent plasma has been shown to reduce morbidity and mortality rates as well as shorten the hospital stay in patients with severe acute respiratory syndrome in uncontrolled nonrandomized clinical trials [3 ,4] .
A prospective, double-blind, randomized, controlled clinical trial using H1N1 convalescent plasma showed a significant reduction in viral load with reduced mortality rate within 5 days of the symptom onset [5] .
During the outbreaks of the Ebola virus in 2014, the WHO recommended the use of Ebola convalescent plasma transfusion as empirical treatment [5] .
In the diagnosis and management of COVID-19 patients, imaging has played a controversial role [6] .
In February of 2020, AJR found that the rate of missed COVID-19 on HRCT chest is very low; which means negative CT may help physicians in managing patients within the incubation window [7] .
In March of 2020, the ACR urges caution in utilizing chest CT to take the decisions in testing the patients for COVID-19 or not [8] .
Common chest CT findings are noted in COVID-19 patients include bronchovascular thickening, peripheral and bilateral distributions of patchy subsegmental ground-glass opacity, and patchy consolidations in later phases of the infection. Intralobular septal thickening along with ground-glass opacity forming crazy-paving appearance may be noted as well. For follow-up scans, better to assess the severity score which depends on scoring the percentages of each of the 5 lobes range from 0 (no involvement) to 25 (maximum involvement) when all the 5 lobes show more than 75% involvement [9 ,10] .

Conclusion
The COVID-19 infection may cause severe inflammatory response followed by serious lung damage that can be detected, scored, and followed up by chest HRCT.
In the absence of definitive curative treatment, the use of plasma collected from recovered patients shows an initial promise; however, no enough published data are there to support this passive antibody therapy [11] .