Monthly Archives: September 2010

What is a Fetal Monitor?

Purpose

A fetal monitor is a machine used to monitor the condition of the fetus by simultaneously measuring and recording:

  • Fetal Heart Rate (FHR)
  • Fetal Movement (FM)
  • Uterine Contractions (UC)

Parameters

Fetal Heart Rate (FHR)

FHR is detected by using an ultrasound transducer. The movement of the fetal heart affects the frequency of the reflected ultrasound. FHR is calculated from this reflected ultrasound and is usually used to monitor the oxygen delivery status.

Uterine Activity (UA)

UA is detected by a TOCO transducer which contains a pressure sensor. UA is used to monitor the interval, period, and intensity of uterine contraction. UA may be called UC (Uterine Contraction)

Fetal Movement (FM)

FM is detected by an ultrasound transducer. The movement of the fetus’ body affects the frequency of the reflected ultrasound. FM is calculated from this reflected ultrasound and usually used to evaluate fetus status during NST (Non-Stress Test)

What is a Patient Monitor?

Purpose

A patient monitor is a medical device capable of continually checking, observing, and recording the vital signs of patients. These vital signs include:

  • ECG
  • Blood Pressure
  • SpO2
  • Respiration
  • Temperature

Physicians keep track of these vital signs when monitoring anesthetized or critical care patients.

Parameters

Electrocardiograph (ECG)

A measure of the subtle voltage differences on the body surface around the heart to monitor the status of heart function. Heart rate is calculated from ECG in real-time.

  • HR: Heart Rate

Non-Invasive Blood Pressure (NIBP)

The force that circulating blood exerts on the walls of the arteries.

  • Systolic BP: Pressure during contraction of the heart
  • Diastolic BP: Pressure during relaxation phase
  • Mean BP: Systolic BP + 2 x Diastolic BP / 3

Pulse Oximetry (SpO2)

Pulse oximetry provides early information on problems in the delivery of oxygen to the tissue. Those problems may arise because of improper gas mixtures, blocked hoses or airways, inadequate ventilation, diffusion, or circulation.

  • SaO2: Arterial Oxygen Saturation
  • SpO2: Pulse Oximeter Saturation