Tesis

Korelasi Kadar Interleukin 6 dan Panjang Interval QTc Pada Pasien COVID-19 yang Menjalani Rawat Inap = Correlation of Interleukin 6 Levels and the Length of the QTc Interval in Inpatient COVID-19 Patients.

Latar Belakang. Panjang interval QTc dipengaruhi oleh berbagai faktor, salah satunya oleh inflamasi. Pada pasien COVID-19 sering terjadi badai sitokin sehingga menyebabkan peningkatan signifikan dari sitokin inflamasi, termasuk interleukin 6. Peningkatan interleukin 6 menyebabkan perubahan pada kanal ion kardiomiosit sehingga menyebabkan pemanjangan interval QTc yang berisiko aritmia. Tujuan. Mengetahui korelasi dengan melihat beda rerata kadar interleukin 6 dan panjang interval QTc, nilai titik potong kadar interleukin 6 terhadap panjang interval QTc > 500 ms dan kekuatan kadar interleukin 6 dalam menilai risiko aritmia ventrikular. Metode. Penelitian ini menggunakan desain studi potong lintang dengan mengambil data sekunder rekam medik pasien COVID-19 yang menjalani rawat inap di RSCM Kiara sejak November 2020 hingga Maret 2021. Pada penelitian ini dilakukan analisis bivariat menggunakan uji Spearman. Selanjutnya dilakukan analisis terhadap beda rerata kadar interleukin 6 pada kelompok subyek dengan panjang interval QTc > 500 ms dan kelompok subyek dengan panjang interval QTc normal. Dilakukan analisis dengan Receiver Operating Curve (ROC) untuk melihat Area under curve (AUC) dan menentukan titik potong kadar interleukin 6 terhadap panjang interval QTc > 500 ms. Hasil. Pada penelitian ini didapatkan korelasi kadar interleukin 6 dan panjang interval QTc (r=0,72). Median kadar interleukin 6 pada kelompok subyek dengan interval QTc > 500 ms yaitu 99,36 pg/ml sedangkan pada kelompok subyek dengan interval QTc normal yaitu 19,51 pg/mL. Didapatkan AUC=0,852 untuk menentukan titik potong kadar interleukin 6 terhadap panjang interval QTc > 500 ms dengan nilai 59 pg/ml, dengan sensitivitas 80,6% dan spesifisitas 80%. Kejadian aritmia ventrikular tidak ditemukan sehingga tidak dapat dilakukan analisis untuk menilai kekuatan kadar interleukin 6 untuk menentukan risiko aritmia ventrikular. Kesimpulan. Terdapat korelasi kadar interleukin 6 dan panjang interval QTc dengan beda rerata kadar interleukin 6 pada subyek dengan interval QTc > 500 ms 5 kali lebih besar dibandingkan kelompok subyek dengan panjang interval QTc normal. Kadar interleukin 6 59 pg/mL ditentukan sebagai nilai titik potong terhadap panjang interval QTc > 500 ms.
Kata Kunci. Panjang interval QTc, interleukin 6, COVID-19


Background. The length of the QTc interval is influenced by various factors, one of which is inflammation. In COVID-19 patients, cytokine storms often occur, causing a significant increase in inflammatory cytokines, including interleukin 6. An increase in interleukin 6 can cause changes in the ion channels of cardiomyocytes, which can lead to prolonged QTc interval which is at risk of arrhythmias. Objective. Knowing the correlation by looking at the differences in interleukin 6 levels and the length of the QTc interval, the cut-off value of interleukin 6 levels to the length of the QTc interval > 500 ms and the strength of interleukin 6 levels in assessing the risk of ventricular arrhythmias. Method. This study used a cross-sectional study design by taking secondary data from the medical records of COVID-19 patients who were hospitalized at RSCM Kiara from November 2020 to March 2021. In this study, a bivariate analysis was carried out using the Spearman test. Furthermore, an analysis of the mean difference in interleukin 6 levels was carried out in the subject group with a QTc interval length> 500 ms and the subject group with a normal QTc interval length. Analyzes were performed using the Receiver Operating Curve (ROC) to see the area under curve (AUC) and determine the interleukin 6 cutoff point for the QTc interval length> 500 ms. Result. The correlation between interleukin 6 levels and the length of the QTc interval (r=0.72) was found. The median level of interleukin 6 in the group of subjects with a QTc interval > 500 ms was 99.36 pg/ml while in the group of subjects with a normal QTc interval it was 19.51 pg/mL. AUC = 0.852 was obtained to determine the cut-off point for interleukin 6 levels to the QTc interval length > 500 ms with a value of 59 pg/ml, with a sensitivity of 80.6% and specificity of 80%. The incidence of ventricular arrhythmias was not found so that an analysis could not be performed to assess the power of interleukin 6 levels to determine the risk of ventricular arrhythmias. Conclusion. There is a correlation between levels of interleukin 6 and the length of the QTc interval. The mean difference of interleukin 6 levels in subjects with QTc intervals> 500 ms was 5 times greater than those in groups of subjects with normal QTc interval lengths. The level of interleukin 6 59 pg / mL was determined as the cutoff value for the QTc interval length > 500 ms.
Keywords. Long interval QTc, interleukin 6, COVID-19