# Long-term outcomes of post-acute sequelae of SARS-CoV-2 infection: a cohort study protocol

## TL;DR

This study aims to understand the long-term health effects of SARS-CoV-2 infection by tracking over 4,000 patients in Gansu Province for up to four years.

## Contribution

The study introduces a comprehensive protocol integrating spatiotemporal, clinical, environmental, and socioeconomic data to analyze long-term PASC outcomes.

## Key findings

- The study will track patients across three age groups to assess PASC persistence and health outcomes.
- Environmental and socioeconomic factors will be analyzed for their correlations with PASC diagnosis and recovery.
- Mixed-effects models and spatiotemporal analyses will evaluate the impact of various factors on PASC trajectories.

## Abstract

Post-Acute Sequelae of SARS-CoV-2 Infection (PASC) presents a multifaceted interplay of demographic, clinical, environmental, and socioeconomic factors. Quantification at the individual level of these factors remains underexplored. Our study aims to address this knowledge gap by analyzing the long-term health implications of PASC, utilizing a comprehensive integration of spatiotemporal, clinical, environmental, and socioeconomic data.

The study will enroll over 4,000 confirmed COVID-19 patients from Gansu Provincial Hospital, treated from December 2022 to May 2023, as the baseline. These patients are spread across 14 cities in Gansu Province, with geographic coordinates ranging from 92°13′E to 108°46′E and 32°31’N to 42°57’N. Follow-ups will be conducted via structured telephone interviews at 24, 36, and 48 months post-discharge, from 2024 to 2027, to assess PASC and long-term health outcomes. Participants will be categorized into three age groups: children and teenagers (birth to 18 years), adults (18–65 years), and the older adult (over 65 years). Environmental and socioeconomic data corresponding to each case are also integrated. The primary objective is to assess the persistence and long-term health outcomes of PASC symptoms. Secondary objectives focus on evaluating the acute infection phase, its progression, and the efficacy of medical management strategies in influencing PASC trajectories. Mixed-effects models will be utilized to evaluate the impact of various factors on PASC, while spatiotemporal analyses will explore the correlations between environmental and socioeconomic conditions and the diagnosis and recovery trajectories of PASC.

The Gansu Provincial Hospital’s research ethics committee has approved this study protocol. Participation will be voluntary, with informed consent obtained from all participants. Study results will be published in peer-reviewed journals.

ChiCTR2400091805.