Exhibit 99.28 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-I KEY PERFORMANCE FACTORS April 30, 1998 Expected B Maturity 8/16/04 Blended Coupon 6.4879% Excess Protection Level 3 Month Average 5.48% April, 1998 5.90% March, 1998 5.83% February, 1998 4.70% Cash Yield18.66% Investor Charge Offs 4.96% Base Rate 7.80% Over 35 Day Delinquency 5.03% Seller's Interest14.63% Total Payment Rate14.61% Total Principal Balance$35,947,972,379.88 Investor Participation Amount$750,000,000.00 Seller Participation Amount$5,259,577,861.39