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Determinants of in-hospital mortality in COVID-19; a prospective cohort study from Pakistan
Samreen Sarfaraz1, Quratulain Shaikh2, Syed Ghazanfar Saleem3
1Infectious Disease Department, The Indus Hospital, Karachi, Pakistan.
Insights
COVID-19 patients over 60, with low oxygen saturation, and elevated procalcitonin levels faced higher in-hospital mortality. These factors significantly increased the risk of death among hospitalized coronavirus disease 2019 patients.
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Epidemiology
Background:
- The COVID-19 pandemic caused significant in-hospital mortality globally.
- Identifying predictors of mortality is crucial for managing severe cases.
Purpose of the Study:
- To estimate in-hospital mortality among COVID-19 patients in Karachi, Pakistan.
- To identify determinants associated with mortality in these patients.
Main Methods:
- Prospective cohort study of 170 adult COVID-19 patients from March to June 2020.
- Data collected on demographics, clinical presentation, laboratory values, and outcomes.
- Univariable and multivariable logistic regression analyses were performed.
Main Results:
- Overall in-hospital mortality was 39%.
- Non-survivors were older (≥60 years), had lower oxygen saturation (<93%), and higher procalcitonin levels (>2ng/ml).
- Multivariable analysis identified age, low oxygen saturation, and high procalcitonin as independent predictors of mortality.
Conclusions:
- Age, low peripheral oxygen saturation, and elevated serum procalcitonin are significant predictors of in-hospital mortality in COVID-19 patients.
- Multisystem organ failure and respiratory failure were the primary causes of death.
- Further large-scale prospective studies are recommended to validate these findings.
Abstract:
A prospective cohort study was conducted at the Indus Hospital Karachi, Pakistan between March and June 2020 to estimate the in-hospital mortality among hospitalized COVID-19 patients and its determinants. A total of 170 adult patients were enrolled and all-cause mortality was found to be 39% (67/170). Most non-survivors were above 60 years of age (64%) while gender distribution was quite similar in both groups (males: 77% vs 78%). Most (80.6%) non-survivors came with peripheral oxygen saturation less than 93% while 95% of them had critical disease on arrival. Use of non-invasive ventilation in emergency room was higher among non-survivors (56.7%) versus survivors (26.2%). Median Interleukin-6 levels were higher among non-survivors (78.6: IQR = 33.8-49.0) compared to survivors (21.8: IQR = 12.6-36.3). Most patients in the non-survivor group (86.6%) required invasive ventilator support during hospital stay compared to 7.8% in the survivors. The median duration of ICU stay was longer for non-survivors (9: IQR = 6-12) compared to survivors (5: IQR = 3-7) days. Univariable binary logistic regression showed that age above 60 years, oxygen saturation below 93%, Neutrophil to lymphocyte ratio above 5, procalcitonin above 2ng/ml, unit increase in SOFA score and arterial lactate levels were associated with mortality. We also found that a unit decrease in Pao2/FiO2 ratio and serum albumin were associated with mortality in our patients. Multivariable regression showed that age above 60 years (aOR = 3.4: 95% CI = 1.6-6.9), peripheral oxygen saturation below 93% (aOR = 3.5:95% CI = 1.6-7.7) and serum pro-calcitonin above 2ng/ml (aOR = 4.8; 95% CI = 1.9-12.2) were associated with higher odds of mortality when adjusted by month of admission. Most common cause of death was multisystem organ failure in 35 (56.6%) non-survivors while 22 (35.5%) died due to respiratory failure. Larger prospective studies are needed to further strengthen these findings.
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