Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-E KEY PERFORMANCE FACTORS October 31, 1999 Expected B Maturity 4/15/02 Blended Coupon 6.2439% Excess Protection Level 3 Month Average 5.84% October, 1999 5.51% September, 1999 6.01% August, 1999 5.99% Cash Yield 18.61% Investor Charge Offs 4.68% Base Rate 8.42% Over 30 Day Delinquency 5.07% Seller's Interest 9.14% Total Payment Rate 14.64% Total Principal Balance $47,636,626,081.62 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,354,806,563.13