What is the standard for normal central venous pressure

The normal range of central venous pressure is 5-12 centimeters of water column, and the measurement results are affected by factors such as blood volume, cardiac function, vascular tension, intrathoracic pressure, and measurement position.

1. Blood volume impact:

When blood volume is insufficient, central venous pressure is low, which is commonly seen in dehydration or blood loss; When there is an increase in blood volume, it is often seen in cases of excessive infusion or renal dysfunction. Clinical evaluation should be based on comprehensive factors such as urine output and skin elasticity.

2. Cardiac function association:

Patients with right heart failure experience a decrease in the heart's pumping ability, leading to blood stasis in the venous system and an increase in pressure; When myocardial contractility increases, the pressure may be lower. During monitoring, it is necessary to simultaneously observe signs such as jugular vein engorgement. 3. Changes in vascular tone: During the use of vasodilators or septic shock, vascular tone decreases and central venous pressure values decrease; Blood vessel constriction drugs or stress states may result in abnormally high values.

4. Chest pressure interference:

Mechanical ventilation, pneumothorax, or pleural effusion can increase intrapleural pressure, leading to a false increase in measured values; The value is closer to the true level in the state of spontaneous breathing. The patient's respiratory status should be marked during measurement.

5. Differences in posture measurement:

The measurement value in the supine position is a standard reference, and the value decreases by about 2-4 centimeters of water column when in the semi recumbent position. Severe patients need to maintain a fixed measurement position to ensure data comparability, and the tip of the catheter should be located at the junction of the superior vena cava and the right atrium.

Daily monitoring requires standardized operating procedures to avoid catheter blockage or positional deviation. For patients with heart failure, it is recommended to record 24-hour dynamic trends rather than single values; When managing capacity, a comprehensive judgment should be made based on indicators such as central venous pressure, blood pressure, and lactate. postoperative patients should be monitored every 4 hours, and if the value persists above 15 centimeters of water column, they should be alert to emergencies such as pericardial tamponade. During the nutritional support phase, it is necessary to control the infusion rate and maintain the ideal range of 8-10 centimeters of water column.