Angioplasty, Balloon; Arterial Occlusive Diseases; Lower Extremity/blood supply; Peripheral Arterial Disease; Ventricular Dysfunction, Left; Aged; Angioplasty, Balloon/adverse effects; Angioplasty, Balloon/methods; Arterial Occlusive Diseases/diagnosis; Arterial Occlusive Diseases/physiopathology; Arterial Occlusive Diseases/therapy; Blood Flow Velocity; Diastole; Echocardiography/methods; Female; Humans; Male; Middle Aged; Peripheral Arterial Disease/diagnosis; Peripheral Arterial Disease/physiopathology; Peripheral Arterial Disease/therapy; Postoperative Period; Recovery of Function; Treatment Outcome; United States; Vascular Resistance; Ventricular Dysfunction, Left/diagnosis; Ventricular Dysfunction, Left/etiology; Ventricular Dysfunction, Left/physiopathology