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Hemodynamic monitoring is the continuous or repeated measurement of how blood moves through the circulation, most often blood pressure and cardiac output, using dedicated sensors, a pressure monitor and alarms. It is used mainly to guide intensive care therapies. This page is for clinic staff, buyers and students who need to understand what the equipment is, how the parts fit together and how US regulators classify them.
This page describes products and general use; it is not medical advice.
What is hemodynamic monitoring?
Hemodynamic monitoring means measuring the pressures and flows of the circulatory system at the bedside, rather than relying on a single intermittent reading. A review in Annals of Translational Medicine states that continuous hemodynamic monitoring is used to guide many intensive care unit therapies, and calls cardiac output and systemic vascular resistance crucial variables for ICU patients. Who uses it: intensive care and critical care teams, with biomedical engineering and supply staff responsible for the equipment behind it.
It is a system, not one device. A single cuff reading from a blood pressure cuff is a spot check; hemodynamic monitoring adds continuous signals, waveforms and alarm limits.
How a monitoring system is built
An invasive pressure-monitoring chain runs from the patient to the screen in a fixed order: a catheter in the vessel, fluid-filled pressure tubing (see arterial line tubing), a transducer, a pressure monitor and an alarm function. Catheter types are covered in the central venous catheter guide.
US federal regulations describe two parts of this chain in plain terms:
- The transducer measures blood pressure through changes in mechanical or electrical properties, and its proximal end is connected to a pressure monitor, which generates an analog or digital electrical signal (21 CFR 870.2850).
- The blood pressure alarm accepts the signal from a blood pressure transducer amplifier, processes it, and emits an alarm when blood pressure falls outside a pre-set upper or lower limit (21 CFR 870.1100).
How regulators classify the parts
| Component | FDA regulation | Classification | What the regulation says it does |
|---|---|---|---|
| Extravascular blood pressure transducer | 21 CFR 870.2850 | Class II (performance standards) | Measures blood pressure and connects to a pressure monitor |
| Blood pressure alarm | 21 CFR 870.1100 | Class II (performance standards) | Emits an alarm when pressure falls outside pre-set upper or lower limits |
Source: 21 CFR 870.2850 and 870.1100 (eCFR), date checked 2026-10-31. These are the two regulations covering the transducer and the alarm.
Types: invasive, minimally invasive and non-invasive
| Type | Example equipment | Key difference |
|---|---|---|
| Invasive | Pulmonary artery catheter; arterial line | Requires central access for a pulmonary artery catheter, which carries several risks, most notably infection. A pulmonary artery catheter provides right atrial pressure, pulmonary capillary wedge pressure and cardiac output. |
| Minimally invasive | Systems built on an arterial line | Newer systems rely on limited invasive arterial lines rather than a full pulmonary artery catheter. |
| Non-invasive | Finger-cuff devices such as CNAP and ClearSight (continuous) | Described in the review as a safe alternative for hemodynamic monitoring. |
Source: Pour-Ghaz I et al., 2019, Annals of Translational Medicine, date checked 2026-10-31.
Common mistakes
- Treating it as one device. The transducer, monitor, alarm and catheter are separate parts, and the regulations above cover them separately.
- Confusing it with a cuff reading. An intermittent cuff pressure is not continuous hemodynamic monitoring. See choosing diagnostic and patient monitoring equipment for the wider equipment landscape.
- Assuming the invasive and non-invasive methods use the same equipment. Catheter-based systems need catheters and pressure tubing; finger-cuff devices do not.
Frequently asked questions
What is hemodynamic monitoring in simple terms?
It is the bedside measurement of blood pressure and related circulation values, such as cardiac output, using sensors, a monitor and alarms, so that care teams can follow changes continuously.
What equipment does it involve?
Depending on the method: catheters, fluid-filled tubing, a pressure transducer, a pressure monitor and alarm, or a finger-cuff device for non-invasive continuous monitoring.
Are the parts regulated medical devices?
In the US, the extravascular blood pressure transducer (21 CFR 870.2850) and the blood pressure alarm (21 CFR 870.1100) are both Class II devices.
Supply teams sourcing related items can browse diagnostic, monitoring and imaging supplies.
Sources
Date checked: 2026-10-31.
- 21 CFR 870.2850, Extravascular blood pressure transducer. https://www.ecfr.gov/current/title-21/section-870.2850, date checked 2026-10-31.
- 21 CFR 870.1100, Blood pressure alarm. https://www.law.cornell.edu/cfr/text/21/870.1100, date checked 2026-10-31.
- Pour-Ghaz I et al. Accuracy of non-invasive and minimally invasive hemodynamic monitoring: where do we stand? Ann Transl Med, 2019. https://atm.amegroups.org/article/view/27445/html, date checked 2026-10-31.
