Table 1.

QRS classification using the original and modified Pan–Tompkins algorithm on standard databases.

Database	Total beats	Original PTa		Modified PT
		Seb (%)	PPVc (%)	Se (%)	PPV (%)	SQId pass (%)
MITDBe	109,494	99.73	99.33	99.58	99.95	98.07
EDBf	790,565	99.71	95.48	99.87	99.80	96.55
Cumulative	900,059	99.72	95.93	99.83	99.82	96.73

^aPT: Pan–Tompkins.

^bSe: sensitivity.

^cPPV: positive predictive value.

^dSQI: signal quality index.

^eMITDB: MIT-BIH database.

^fEDB: European ST-T database.