This study will evaluate the performance of the Quantra System comprised of the Quantra Hemostasis Analyzer with the Quantra QPlus Cartridge in patients undergoing cardiac surgery utilizing cardiopulmonary bypass, including the placement of a ventricular access device.

The Quantra System is a fully integrated and automated in vitro diagnostic device which uses SEER Sonorheometry, and ultrasound-based technology, to characterize the viscoelastic properties of a whole blood sample during coagulation. The Quantra QPlus Cartridge was developed to monitor hemostasis during major surgical procedures in adult patients. The cartridge consists of four independent channels each containing different sets of reagents, which provide four measurements performed in parallel yielding six parameters that depict the functional status of a patient's coagulation system.

This single-center, prospective, observational study will evaluate the performance of the Quantra System as compared to and comparable measures determined using the TEG 5000.

Inclusion Criteria:

• Subject is ≥ 18 years
• Subject is scheduled for cardiac surgery utilizing cardiopulmonary bypass, including the placement of a ventricular access device.
• Subject is willing to participate, and he/she has signed a consent form.

Exclusion Criteria:

• Subject is younger than 18 years
• Subject is unable to provide written informed consent
• Subject is incarcerated at the time of the study
• Subject is pregnant
• Subject is currently enrolled in a distinct study that might confound the results of the proposed study
• Subject is affected by a condition that, in the opinion of the clinical team, may pose additional risks

The study population includes subjects 18 years or older undergoing cardiac surgery utilizing cardiopulmonary bypass, including placement of a ventricular access device.