Exhibit 99.23 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-B KEY PERFORMANCE FACTORS May 31, 1998 Expected B Maturity 3/15/12 Blended Coupon 5.8898% Excess Protection Level 3 Month Average 5.47% May, 1998 4.84% April, 1998 5.81% March, 1998 5.77% Cash Yield 17.95% Investor Charge Offs 5.01% Base Rate 8.09% Over 35 Day Delinquency 5.17% Seller's Interest 13.80% Total Payment Rate 13.68% Total Principal Balance $35,599,996,121.04 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $4,911,601,602.55