Diagram of<unk>  artery catheter The<unk>  <unk> P), also called<unk>  arterial<unk>  pressure (PAWP),<unk>  capillary<unk>  pressure (PCWP),<unk>  artery occlusion pressure (PAOP), or cross-sectional pressure, is the pressure measured by<unk> ng a<unk>  catheter with an inflated balloon into a small<unk>  arterial branch. It estimates the left atrial pressure.<unk>  venous<unk>  pressure (PVWP) is not synonymous with the above; PVWP has been shown to correlate with<unk>  artery pressures in studies, albeit unreliably. Physiologically, distinctions can be drawn among<unk>  artery pressure,<unk>  capillary<unk>  pressure,<unk>  venous pressure and left atrial pressure, but not all of these can be measured in a clinical context. Noninvasive estimation techniques have been proposed. __TOC__
Pulmonary wedge pressure
Transpulmonary pressure
Right atrial pressure
Coronary perfusion pressure
Arteriovenous oxygen difference
Central venous pressure
Mean arterial pressure
Mean systemic pressure