Acute Effects of EMWs Emitted by Cell Phones Clinical Trial
Official title:
Acute Effects of Cell Phone Exposure on Immediate Attention Levels and Concentration of Emergency Physicians
To investigate the acute effects of cell phone exposure on immediate attention levels and concentration of emergency department physicians
The development of new media technologies has made these an indispensible part of human life.
Increasing cell phone use is to a large extent a component of this development.
The effects on humans of electromagnetic waves (EMW) has been a subject of particular
interest and concern in recent years.
Cell phone technology; With the Wireless Local Area Network (WLAN), Bluetooth and Digital
Enhanced Cordless Telecommunications (DECT), cell phones have become one of the most commonly
used sources of EMW to which humans are today exposed.
Concerns over the effects of EMW (at a range of 900-1800 MHz) cell phone receivers may be
associated with carcinogenic and neuronal activity. Excessive use of cell phones is known to
cause headache, a feeling of discomfort and a warm sensation around the ear. In addition, it
is thought to have side-effects including memory loss, depression and adverse impacts on
attention and concentration.
Attention is defined as the individual directing his mental receptors toward a stimulus or
stimuli occurring in the phenomenal environment, of which he is aware and which he can
perceive with his sense organs. Attention is also a nervous system function permitting the
individual to concern himself solely with stimuli in the context of needs and aims at that
moment from among the many stimuli in the environment.
One of the significant features of attention is that it is selective. There are many stimuli
around us potentially capable of attracting our attention. Since it is impossible to focus on
all of these, one must be able to select the important ones. Selective attention refers to
the ignoring of other stimuli by identifying the important one and directing one's attention
to a specific stimulus. In other words, it means reacting only to relevant stimuli, not to
irrelevant ones.
Emergency care means the prompt provision of the medical care required by an individual with
a life-threatening condition. Emergency departments are units that provide this service for
patients requiring emergency care. Emergency departments are places in which health personnel
are in a constant state of activity and have to provide constant services at an intense work
rate. Personnel such as emergency medicine specialists and emergency medicine assistant
physicians or other specialist physicians and practitioners, nurses, health administrators,
emergency medicine technicians and ancillary staff work in emergency departments. Emergency
department personnel are exposed to very significant stress factors, such as taking immediate
and vitally important decisions, an intense work rate, long shifts, insufficient rest time,
and the need to cope with rude and aggressive patients and relatives. These stress factors
are estimated to affect health workers' attention levels, decision-making abilities and
concentration. Factors such as inattention and memory errors that compromise that compromise
the individual's concentration are reported to pay an important role in medical errors in
emergency departments. The importance of attention and concentration is obvious in emergency
departments, where vital decisions are made concurrently, and where medical procedures must
be performed to perfection and in a race against time. Combatting factors that have a
negative impact on this is highly important. The hypothesis that cell phones and
electromagnetic fields may have an effect on this attention and concentration constituted the
basis of the current study.
Cell phone use among emergency department physicians is widespread, as in all other fields.
Cell phone use is particularly important for requesting consultations in patient management
in the emergency department.
The purpose of this study is to investigate the acute effects on emergency physicians'
attention and concentration of EMWs emitted by cell phones.
Study protocol
At the beginning of the study, emergency department physicians were asked to complete an
assessment form in order to determine the inclusion and exclusion criteria (App-1).
The investigators were planned to enroll 30 emergency physicians on the basis of the
inclusion and exclusion criteria described above.
An internet-based power analysis program was used to calculate the sample size (UCSF
Biostatistics:Power and sample size programs.
http://www.biostat.ucsf.edu/sampsize.html#G*Power.) According to a preliminary study the
investigators were performed before EMW exposure, emergency physicians' mean attention level
was determined at 75. The sample size was calculated predicting a 50% decrease with EMW
exposure. The investigators were therefore targeted 30 participants, 15 in each group, for
80% power.
The investigators were planned to apply the d2 test of attention, which is widely recognized
in the literature, to assess attention and concentration before the study, to all the
physicians enrolled. Based on TN-E scores in the d2 test of attention, the participants were
listed in order of highest score to lowest. Following that procedure, two-way randomization
was applied and two groups (experimental and control) with similar initial attention level
were established using the head-tail method.
Experimental group: The investigators were planned that all participants in this group would
hold a cell phone to their left ears in their left hands, in 'on' mode, for 15 min, and that
they would thus be exposed to a 900-1800 MHz magnetic field (EMW) for 15 min.
Control group: these would hold a cell phone to their left ears in their left hands for 15
min in 'off' mode.
Throughout the study, The investigators were planned that the cell phone screen would be
covered with black tape, and that all participants and the author performing subsequent
attention evaluations would be unaware whether the cell phone was 'on' or 'off'.
Following this 15-min procedure, The investigators were planned that the d2 test of attention
would be administered to both groups by a specialist psychologist in a blinded manner, and
planned to compare attention and concentration levels between the experimental group exposed
to EMW via cell phone and the non-exposed control group.
d2 test of attention: A time-dependent test measuring selective attention and concentration.
Other parameters measured are speed of performance, rule compliance and performance quality.
The test can be administered individually or in groups between the ages of 9 and 60. The test
form contains 14 rows with 47 figures in each. The letters 'd' and 'p' are used in the test.
Up to four marks are placed above, below or both above and below some letters. There are 16
total possible forms, depending on the marks on the letters.
The task of the person administered the test is to find all the letters 'd' with two marks.
The subject is allowed 20 seconds to complete the task set out in each row and is asked to
find all the letters 'd' with two marks. The test takes approximately 8 min to administer.
Evaluation of the test is based on TN: Total number of symbols marked (psycho-motor speed),
E1: Number of symbols skipped without being marked (selective attention), E2: Number of
symbols marked incorrectly (special learning difficulty), E: Focusing level, CP: Total number
of correct marks , TN-E: Total number of items minus error score (test performance), FR: The
difference between the maximum and minimum numbers of items processed (distractibility) and
PR: TN-E score percentile rank percentage score .
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