Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-B KEY PERFORMANCE FACTORS February 28, 1998 Expected B Maturity 3/15/12 Blended Coupon 5.8585% Excess Protection Level 3 Month Average 4.86% February, 1998 4.64% January, 1998 4.73% December, 1997 5.19% Cash Yield 16.74% Investor Charge Offs 4.83% Base Rate 7.27% Over 35 Day Delinquency 5.04% Seller's Interest 15.07% Total Payment Rate 12.54% Total Principal Balance $34,488,564,555.67 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $5,197,230,037.18