Attachment of a marker to a commissure of a prosthetic heart valve

A method comprising:

• extending sutures from opposite sides of a first portion of a commissure attachment member, through one or more apertures in a marker disposed on the attachment member, and to opposite sides of a second portion of the attachment member, wherein the first portion is disposed adjacent to a first end of the marker and the second portion is disposed adjacent to a second end of the marker, the second end arranged opposite the first end in an axial direction, and wherein the attachment member forms a commissure with two adjacent leaflets of a prosthetic heart valve and is arranged across a cell of a frame of the prosthetic heart valve;
• forming knots with the sutures on opposite sides of the second portion of the attachment member such that the marker is suspended within the cell;
• and
• radially compressing the prosthetic heart valve onto a delivery apparatus from a radially expanded configuration to a radially compressed configuration, and moving the knots axially away from the marker and laterally toward one another in response to axially elongating the frame during radial compression of the prosthetic heart valve such that a distance along the sutures between the knots and the marker is maintained between the radially expanded and radially compressed configurations.