Exhibit 99.30 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-M KEY PERFORMANCE FACTORS March 31, 1999 Expected B Maturity 10/15/02 Blended Coupon 5.1746% Excess Protection Level 3 Month Average 6.19% March, 1999 6.73% February, 1999 6.04% January, 1999 5.78% Cash Yield 19.22% Investor Charge Offs 5.12% Base Rate 7.37% Over 35 Day Delinquency 4.94% Seller's Interest 6.34% Total Payment Rate 14.77% Total Principal Balance $40,628,355,078.94 Investor Participation Amount $750,000,000.00 Seller Participation Amount $2,576,435,560.45