Exhibit 99.38 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-B KEY PERFORMANCE FACTORS February 29, 2000 Expected B Maturity 3/16/2009 Blended Coupon 5.9788% Excess Protection Level 3 Month Average 5.44% February, 2000 6.15% January, 2000 5.37% December, 1999 4.80% Cash Yield18.80% Investor Charge Offs 4.75% Base Rate 7.90% Over 30 Day Delinquency 5.01% Seller's Interest 9.54% Total Payment Rate14.30% Total Principal Balance$48,263,301,515.80 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,604,500,997.31