Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-B KEY PERFORMANCE FACTORS October 31, 1998 Expected B Maturity 3/15/12 Blended Coupon 5.6421% Excess Protection Level 3 Month Average 5.53% October, 1998 5.93% September, 1998 4.35% August, 1998 6.31% Cash Yield 18.93% Investor Charge Offs 4.98% Base Rate 8.02% Over 35 Day Delinquency 5.16% Seller's Interest 8.67% Total Payment Rate 14.28% Total Principal Balance $39,561,435,127.71 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $3,431,640,609.22