The objective of this study is to demonstrate the superiority of Distal Radial Access (DTRA) to Conventional Transradial Access (CTRA) regarding forearm radial artery occlusion (RAO).

This trial plans to include 1300 patients in around 12 locations around the world (11 participating sites in Europe and 1 participating site in Japan).

DISCO RADIAL is a prospective, global, open label, multi-centre randomized controlled trial with plan to include approximately 1300 patients on who transradial coronary angiography and/or intervention is performed. The patients will be randomized in 1:1 ratio to either Distal Transradial Artery Access (DTRA) or Conventional Transradial Access (CTRA) arm. In both arms 6Fr Glidesheath Slender (GSS) will be used as access sheath.

The sponsor will work in accordance with standard operating procedures (SOP) and the Monitoring Plan in order to ensure adherence to the CIP and applicable regulations at the investigational sites.

The Monitoring Plan is built according to a risk-based monitoring approach and describes the level of source data verification to be performed by the monitors.

Risk-based monitoring approach uses all available means to supervise the trial (central monitoring, remote monitoring and on-site monitoring), focusing in critical data points and issues ensuring that adequate monitoring (central, remote and on-site) at each site is completed to ensure protection of the rights and safety of the subjects and the quality and integrity of the data collected and submitted.

The sponsor shall provide training and the necessary guidelines to assist each investigational site on the data collection in the eCRF. Each site is responsible to report the available data requested by the CIP. In order to ensure data quality and avoid missing information in the eCRF, edit checks are designed during database development. In addition, Sponsor's CRA and Data Management team will be responsible to review the data and raise queries accordingly into the eCRF. An audit trail logging all data entered and edited is available within the EDC system. All source documents are maintained in the hospital files ready for inspection by the Sponsor and regulatory authorities upon request. The Sponsor will inform the investigator of the time period for retaining these records as per applicable regulatory requirements.

The following analysis sets will be considered for the statistical analysis :

As Treated Population This population includes all patients who were treated and undergo the studied procedure. Patients will be assigned to the study treatement groups according to the actual received treatement.

Intention-To-Treat Population This population includes all patients who have been randomized to a treatement. Patients will be assigned to the study treatement groups according to the treatement to which they have been randomized.

Per-Protocol Population This population includes all patients who were treated and undergo the studied procedure, excluding all patients with major violations to the protocol (e.g. wrong inclusion, missing data, mis-randomization, crossover, drop off before discharge). Patients will be assigned to the study treatement groups according to the treatement to which they have been randomized. All the protocol deviations will be reported in statistical report.

Assuming a rate of forearm RAO of 1% in DTRA and 3.5% in CTRA based on on two-sided alpha = 0.050 and power = 80%, 1:1 randomization needs 551 patients for each group to detect statistically significant differences in forearm RAO proportions. Then, given the crossover rate of 10% and the drop out rate of 5% for both group, at least 648 patients needs for each group to maintain proper statistical power. In total 1300 subjects will be randomized.

The primary endpoint analysis will be performed on ITT (Intention-To-Treat) population, by using two-sided superiority test with alpha = 0.05. Due to the short observation period (3 days ±2), a low number of missing data is expected. However, in case it exceeds 15-20%, missing, unused or spurious data will be considered using a tipping point analysis for each population. The comparaison in RAO rates between treatment groups will be tested by Chi-squared tests or Fisher's exact test, as appropriate. Odd-Ratio with IC95% will be calculated. Logistic regression analyses will be used to test the tendency.

Inclusion Criteria:

• Patient is at least 18 years of age.
• Patient has provided written informed consent.
• Patient is undergoing diagnostic coronary angiography and/or PCI.
• Patient is willing to comply with all protocol-required evaluations during the hospitalization.
• Patient is suitable for both DTRA and CTRA using 6Fr GSS.

Exclusion Criteria:

• Patient has a medical condition that may cause non-compliance with the protocol and/or confound the data interpretation.
• Patients on chronic hemodialysis.
• Patients presenting with ST-elevated myocardial infarction (STEMI).
• Patients have chronic total occlusion (CTO) lesions in coronary artery.