The non-invasive central venous pressure estimation in adult cardiac intensive care units (CICU) patients study is a single-center, single-arm, investigator-blinded, interventional, intra-participant comparative, feasibility study. This study aims to assess the safety and preliminary accuracy of external jugular venous occlusion pressure measured non-invasively with the venous occlusion pressure monitoring device (CPMX2) in adult CICU patients. As a feasibility study, the primary goal is to gather preliminary data on the feasibility, safety, and effectiveness of the non-invasive CVP estimation method. Although single arm, the study will compare non-invasive CVP measurements with standard invasive CVP measurements taken concurrently. This intra-participant comparative approach is essential to validate the correlation and reliability of the non-invasive method.

Inclusion Criteria:

• Provision of signed and dated informed consent
• Admitted to the CICU with invasive CVP/RA pressure monitoring placed by standard of care as determined by the treating team before enrollment
• No more than moderate TR as assessed by echocardiogram

Exclusion Criteria:

• Undergoing positive pressure ventilation (Bipap or invasive mechanical ventilation)
• Non-visible external jugular vein bilaterally (by visual examination or with traditional ultrasound examination)
• History of thrombosis in any of the following vessels bilaterally; external jugular vein, internal jugular vein, brachiocephalic vein or superior vena cava
• Skin lesions, vascular access sites or dressings covering neck and impeding access to the external jugular veins at the level of the muscle belly of the sternocleidomastoid muscle