| Mo | mitral opening |
|---|---|
| MVO | maximum venous outflow; mitral valve opening or orifice |
| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |
| opg | opening |
| PAo | airway opening pressure; ascending aortic pressure; pulmonary artery occlusion pressure |