Here is the design of a clinical trial:

Official Title: To Assess Hemodynamic Disturbances to the Ostia of the Renal Arteries Generated by the Implantation of EVAR With a Suprarenal Fixation

Included conditions:
- Aortic Aneurysm, Abdominal
- Endovascular Procedures
- Renal Artery Stenosis

Study Armgroups:
- {'label': 'endovascular aneurysm repair (EVAR) arm', 'type': 'EXPERIMENTAL', 'description': 'every patients are in the same arm and have EVAR with supra-renal fixation', 'interventionNames': ['Device: endovascular aneurysm repair (EVAR)']}

Interventions:
- {'type': 'DEVICE', 'name': 'endovascular aneurysm repair (EVAR)', 'description': 'Patient will be enrolled when the decision of an endovascular procedure with supra renal fixation is required. Before the intervention, Duplex scan will be necessary to evaluate renal arteries ostia. This exam will be realised in the month after the intervention and one year later.', 'armGroupLabels': ['endovascular aneurysm repair (EVAR) arm']}

Primary Outcomes:
- {'measure': 'systolic maximum speed at the ostia of the renal arteries', 'description': 'Quantify the hemodynamic disturbances to the ostia of the renal arteries generated by the implantation of a suprarenal fixation aortic stent immediately postoperatively.', 'timeFrame': 'one month'}

Please estimate the sample size based on the assumption: 
An alpha risk of 5% and an absolute precision of 10% are assumed. The sample size also accounts for potential loss to follow-up.
3.8
        Sample size calculation
        The main objective was to evaluate the proportion of patients with hemodynamic disturbances. We assume that the maximum proportion of these patients is 20%. At an alpha risk of 5%, with an absolute precision of 10%, the number of subjects required is 62. We will include 70 patients to take into account any patients who are lost to follow-up.[20]