Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-B KEY PERFORMANCE FACTORS January 31, 1998 Expected B Maturity 3/15/12 Blended Coupon 5.8272% Excess Protection Level 3 Month Average 4.93% January, 1998 4.73% December, 1997 5.19% November, 1997 4.88% Cash Yield 17.84% Investor Charge Offs 4.71% Base Rate 8.41% Over 35 Day Delinquency 4.85% Seller's Interest 16.09% Total Payment Rate 13.52% Total Principal Balance $34,907,536,752.65 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $5,616,202,234.16