Inclusion Criteria:  Age over 18 years  Exclusion Criteria:  Age <18 years Patient disagreement with the insertion of peripheral venous catheter Disagreement of the patient with inclusion in a clinical trial Contraindication of ultrasound examination of the venous system Contraindication of the introduction of peripheral venous cannula on both upper limbs Necessity of securing other vein access than peripheral Contraindications of cannulation of peripheral vein