Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-E KEY PERFORMANCE FACTORS September 30, 1999 Expected B Maturity 4/15/02 Blended Coupon 5.4395% Excess Protection Level 3 Month Average 5.99% September, 1999 6.01% August, 1999 5.99% July, 1999 5.97% Cash Yield 18.05% Investor Charge Offs 4.60% Base Rate 7.44% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate 14.16% Total Principal Balance $45,780,732,257.76 Investor Participation Amount $750,000,000.00 Seller Participation Amount $3,198,912,739.27