The ZOE® Fluid Status Monitor is a non-invasive, battery powered impedance monitor designed as an 'early warning' monitor for determining changes in the fluid status of patients with fluid management problems.

The ZOE® Fluid Status Monitor works by applying a low amplitude high frequency electrical current to the body, measuring the electrical impedance. Base Impedance also known as Zo, decreases when fluid increases and Zo increases when fluid decreases.

The ZOE® Fluid Status Monitor provides objective data for the early intervention of heart failure, dyspnea, hypertension, and other critical events related to hemodynamic status.

Early Signs & Symptoms Exacerbation
Late Signs & Symptoms Exacerbation

↓ Fluid Volume
Bloated feeling
* Fullness in ears
↓ Zo

↑ Peripheral edema
↑ SOB with exertion
Weight gain
↑ Abdominal girth
↑ Pillow use
Develops a cough

Pitting edema
↑ SOB at rest
Develops crackles
↓ SaO2
Zo less than 15 ohms

* This is when home care nursing intervention must occur to prevent CHF and hospitalization.
(Frantz A. Breaking down the barriers to heart failure patient self-care. Home Healthcare Nurse Journal. 22(2): 109-115, 2004.)

In 1996, Dr. David Milzman conducted a study of 117 adults entering the emergency department with a complaint of difficulty breathing. Prior to obtaining a chest x-ray, these patients were placed on an IQ2™ cardioplethsmograph for Zo measurements of 17 ohms. Patients' x-rays showing pulmonary edema had Zo measures of 15 ohms or less. The results of this study caused Dr. Milzman to name Zo measurement the "noninvasive chest x-rays." Zo measurement is a quick eaasy method for determining amount of pulmonary congestion.

More Information on Zo Measurement

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