Exhibit 99.43 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-H KEY PERFORMANCE FACTORS October 31, 1999 Expected B Maturity 4/15/2004 Blended Coupon 6.4874% Excess Protection Level 3 Month Average 4.59% October, 1999 5.24% September, 1999 3.94% August, 1999 N/A Cash Yield18.61% Investor Charge Offs 4.68% Base Rate 8.69% Over 30 Day Delinquency 5.07% Seller's Interest 9.14% Total Payment Rate14.64% Total Principal Balance$47,636,626,081.62 Investor Participation Amount$1,000,000,000.00 Seller Participation Amount$4,354,806,563.13