Is there any evidence linking changes in CTG to patient use of mobile phones?

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No evidence linking cardiotocography and mobile phone use was identified using the standard clinical query protocol. Additional searching identified advice from the Medicines and Healthcare Products Regulatory Agency on the use of mobile phones in hospitals. 

This notes that under certain circumstances the electromagnetic interference from a mobile phone can affect the performance of some medical devices, and recommends “that mobile phones are not used in critical care areas such as intensive therapy units (ITU), special care baby units (SCBU) or where patients are attached to complex devices, as any effect on such equipment could be extremely detrimental to patient care.”

Studies of the effects of mobile phones on fetal heart rates are contradictory. Celik et al found that electromagnetic fields produced by cellular phones do not cause any demonstrable affect in fetal heart rate, acceleration and deceleration, whereas Rezk et al found that exposure of pregnant women to mobile phone significantly increase fetal and neonatal heart rate, and significantly decreased the cardiac output.

However, two reports in 2012 from The Institution of Engineering and Technology and the Health Protection Agency’s Advisory Group on Non-ionising Radiation found no convincing evidence that mobile phone technologies cause adverse effects on human health.

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