Sleep Studies

In order to better understand and diagnose sleep related issues the Castle Hill Lung Function Unit have at their disposal a number of techniques for investigating sleep disorders. The following is a brief description of some of the various techniques used which all come under the general heading of Sleep Studies.

Sleep reading

Catherine and Toni examine a Sleep Study
at the Lung Function Unit, Castle Hill Hospital.

SLEEP OXIMETRY:
Sleep Oximetry involves a probe being placed onto your finger which will remain in situ throughout the night. This monitors the Oxygen levels in your blood whilst you are asleep.

TRANSCUTANEOUS CO2 MONITORING:
This is similar to sleep Oximetry, in that we will be monitoring your oxygen levels during sleep. However, we will also be monitoring carbon dioxide levels as well. The monitoring site, rather than a finger probe, is a small probe, usually attached to the ear. This is performed in Hospital.

AUTOSET SLEEP STUDY:
An Auto set Sleep Study involves placing a probe onto your finger and a simple nasal cannula (small nasal probe) where it will remain throughout the night.

POLYSOMNOGRAPHY:
Polysomnography involves detailed monitoring of your breathing and respiration throughout the night. You will be attached to a small monitor via a number of wires by which heart rate, chest and abdomen movement, leg movement and blood oxygen levels can be measured and recorded.

CPAP TRIAL:
A (Continuous Positive Pressure), is a trial of the treatment required to treat a condition identified in the diagnostic studies previously carried out (see above). This is a device which, via a mask, delivers a stream of air up the nasal passage and into your lungs, thereby preventing interruption in air flow throughout the night. The mask may take some getting use to but most patients become fairly comfortable with it quite quickly. Should the trial be successful, you will be issued with a machine to take home with you.

CPAP RETITRATION:
This is a study to reassess the pressure your CPAP is currently set at. It is the same test as the CPAP trial you have already had. After the test we will compare the pressure recorded with the pressure you were originally titrated to. It may be necessary to alter this pressure, in which case you should bring your CPAP machine with you to this visit.