<prompt> Measurements of intravacular pressure by a pulmonary aery catheter should be done:At end expirationAt peak of inspirationDuring mid inspirationDuring mid expiration  <response>: Answer is A At end expiration: The changes in intrathoracic pressure that occur during different phases of respiration influence measurement of intravascular pressure. These changes are minimal at end expiration which therefore is the best phase for measurement of intravascular pressure. 