A Simple Pulmonary Ventilation Chart for Use in Intensive (Constant) Care Units, Respiratory Units, or Recovery Rooms
IT has become apparent that there is a need for a visual record of the changing blood gas values in patients who have respiratory problems, particularly those patients dependent on mechanical ventilation. Such a chart has the following advantages in intensive care units, respiratory units, or recovery rooms. (1) It enables the physician to follow the progress of patients and to observe changes in ventilatory state and requirements. (2) It aids the physician in making the evaluation of the postoperative physiologic status, especially of the patient who has undergone cardiac surgery. (3) It serves as a guide in the transition from controlled or assisted to spontaneous respiration. (4) It provides incidental information with regard to the acid-base status, which is of the utmost importance.
The chart (Fig. 1) has been specifically designed to meet the needs of the Cleveland Clinic Hospital, but it is adaptable to any institution with facilities for performing blood gas measurements. At the Cleveland Clinic Hospital these studies are made whenever they are indicated, hence the provision for recording the date and time. The range of values for oxygen pressure (pO2), oxygen saturation (O2), carbon dioxide pressure (pCO2) and the measure of alkalinity and acidity (pH) is considered wide enough for the majority of clinical requirements.
Different symbols are used to denote whether pO2 or O2 saturation was directly measured, rather than derived one from the other. Spaces are provided for the blood gas values and pH and for indication of the status of. . .