The use of venous blood gas in assessing arterial acid-base and oxygenation status - an analysis of aggregated data from multiple studies evaluating the venous to arterial conversion (v-TAC) method.

Background: Several methods exist to reduce the number of arterial blood gases (ABGs). One method, Roche v-TAC, has been evaluated in different patient groups. This paper aggregates data from these studies, in different patient categories using common analysis criteria.

Visual outcomes comparing emmetropia vs mini-monovision after bilateral implantation of a nondiffractive extended vision intraocular lens: randomized trial.

Purpose: To compare visual outcomes and patient satisfaction after bilateral implantation of a nondiffractive extended vision intraocular lens (IOL) when targeting emmetropia vs mini-monovision.

Setting: Iladevi Cataract & IOL Research Centre, Ahmedabad, India.

Design: Prospective, randomized controlled trial.

Mathematically arterialised venous blood is a stable representation of patient acid-base status at steady state following acute transient changes in ventilation.

Hyper- or hypoventilation are commonly occurring stress responses to arterial puncture around the time of blood sampling and have been shown to rapidly alter arterial blood acid-base parameters. This study aimed to evaluate a physiology-based mathematical method to transform peripheral venous blood acid-base values into mathematically arterialised equivalents following acute, transient changes in ventilation. Data from thirty patients scheduled for elective surgery were analysed using the physiology-based method.

Changes in central venous to arterial carbon dioxide gap (PCO gap) in response to acute changes in ventilation.

Background: Early diagnosis of shock is a predetermining factor for a good prognosis in intensive care. An elevated central venous to arterial PCO difference (∆PCO) over 0.8 kPa (6 mm Hg) is indicative of low blood flow states.

Comparison of two methods for converting central venous values of acid-base status to arterial values in critically ill patients.

Background: Assessment of the critically ill patient requires arterial acid-base status. Venous blood could provide a surrogate, with methods transforming venous values to arterial, improving their utility. This manuscript compares two of these methods, a statistical and a physiological method.