Left Atrial Function of COVID-19-recovered Patients During the Surge of Omicron Variants

The included patients who recovered from COVID-19 infection and healthy people underwent transthoracic echocardiography at the First Affiliated Hospital of Shandong First Medical University from December 20, 2022 to January 20, 2023. Routine data and two-dimensional strain parameters of transthoracic echocardiography of the study subjects were obtained:

• The echocardiographic examination was performed using a Epiq 7C ultrasound machine, and images were acquired with the patient in left lateral decubitus using a 3.5-5 MHz transducer at a depth of 16 cm. ECG was recorded, and 3 consecutive cardiac cycles of each view were recorded during quiet breathing at 50-80 frames/sec. All patients were subjected to conventional transthoracic echocardiography & Speckle tracking echocardiography (STE). All measurements were taken following the American Society of Echocardiography (ASE) recommendations.
• Left atrial strain analysis was obtained using automated speckle tracking software. The regions of interest were generated automatically and Left atrial endocardial border was manually adjusted when required. Left atrial phases definition and Left atrial strain values were measured from the Left atrial longitudinal strain curve according to the European Association of Cardiovascular Imaging (EACVI)/American society of echocardiography (ASE) guidelines. Global LV systolic strain was evaluated, and the software automatically traced the contour of the endocardium at apical three, four and two-chamber views.
• At the same time, the general clinical data, demographic characteristics, electrocardiogram, chest CT results, troponin I (hsTnI) and brain natriol peptide levels on the day of echocardiographic examination were obtained through the hospital electronic medical record His system.
• Clinical follow-up was performed 12-18 months after the echocardiographic examination by phone and by electronic health record review. We recorded: 1) persistent cardiac symptoms, 2) interval presentation to the emergency department or hospitalization with cardiac symptoms, and 3) any major adverse cardiac event (myocardial infarction, stroke, revascularization, or death).

Inclusion criteria

• 1. Patients having been diagnosed with SARS-CoV-2 Omicron variant infection based on real-time reverse-transcription polymerase chain reaction (RT-PCR) results; 2. Asymptomatic or mild to moderate COVID-19 patients. 3.COVID-19 patients who came to our hospital for echocardiography within 3 months after recovery.

Exclusion criteria

• Patients with decreased left ventricular ejection fraction (less than 50%), left ventricular segmental wall motion abnormalities, cardiomyopathy, severe valvular heart disease, arrhythmia, thyroid dysfunction, pulmonary hypertension, past or current pulmonary embolism, severe chronic obstructive pulmonary disease, malignancy/renal failure (less than 30) ml/min) or poor cardiogram image quality were excluded from the study.