. 2025 Apr 11;62(5):372–377. doi: 10.1007/s13312-025-00047-z

Table 2.

Electrocardiographic and echocardiographic measurements of the groups

	Severity of MIS-C		P value	Study Group		P value
	Mild (n = 14)	Severe (n = 21)	P value	MIS-C (n = 35)	Control (n = 36)	P value
Electrocardiographic parameters
Heart rate (bpm)	97.5 (79.0–125.0)	100.0 (82.0–135.0)	0.855^a	100.0 (81.0–135.0)	83.0 (68.8–92.5)	< 0.001^a
PR interval (msec)	110.0 (96.3–125.0)	120.0 (96.0–139.0)	0.516^a	110.0 (99.0–138.0)	120.0 (100.0–127.5)	0.342^a
QRS duration (msec)	80.0 (78.0–100.0)	80.0 (80.0–91.5)	0.987^a	80.0 (80.0–96.0)	82.5 (80.0–100.0)	0.184^a
QT interval (msec)	350.0 (337.0–361.5)	350.0 (345.0–370.0)	0.434^a	350.0 (340.0–367.0)	350.0 (350.0–387.5)	0.282^a
QTc (msec)	410.0 (400.0–442.5)	420.0 (390.0–445.0)	0.960^a	420.0 (400.0–440.0)	405.0 (390.0–430.0)	0.143^a
QTd (msec)	93.5 (44.3–118.8)	58.0 (45.0–115.0)	0.677^a	69.0 (47.5–110.0)	130.0 (105.0–140.0)	0.014^a
Echocardiographic parameters
LVEDD (mm)	37.0 (29.8–42.3)	39.0 (33.0–42.0)	0.654^a	44.5 (38.3–46.8)	39.0 (32.0–42.0)	0.003^a
EF (%)	71.0 (66.8–75.3)	65.0 (56.0–67.5)	0.001^a	67.0 (62.0–71.0)	67.5 (65.0–73.0)	0.461^a
FS (%)	38.0 (35.8–44.3)	35.0 (29.0–37.0)	0.003^a	36.0 (33.0–38.0)	38.0 (35.3–41.8)	0.144^a
Mitral E velocity (cm/sec)	0.97 (0.87–1.00)	0.90 (0.84–0.96)	0.118^a	0.92 (0.86–0.98)	0.99 (0.92–1.05)	0.010^a
Mitral A velocity (cm/sec)	0.54 (0.48–0.60)	0.48 (0.45–0.54)	0.175^a	0.50 (0.46–0.56)	0.56 (0.50–0.67)	0.015^a
E/A rate	1.82 (1.52–1.90)	1.88 (1.46–2.04)	0.654^a	1.84 (1.51–1.96)	1.71 (1.48–1.88)	0.157^a

Values expressed as median (IQR)

EF Ejection fraction, FS Fractional shortening, LVEDD Left ventricle end diastolic dDiameter, MIS-C Multisystem Inflammatory Syndrome in Children, QTc Corrected QT interval, QTd QT dispersion

^aMann-Whitney U Test