ABSTRACT
PURPOSE: In our previous study to investigate autonomic nervous system (ANS) activity due to radio frequency (RF) radiation using heart rate variability (HRV), drowsiness was observed in approximately half of all subjects. Therefore, the usage of HRV with unwanted drowsiness could falsely indicate the effects of RF radiation by mobile phones on the ANS. The objective of this study was to determine which posture is appropriate for accurate HRV analysis for provocation study. MATERIALS AND METHODS: A total of 52 healthy subjects (25 males and 27 females) participated in this experiment. We measured the number of times a subject showed drowsiness or sleep deprivation due to awakening, and analyzed HRV six times over 30 minutes in sitting and recumbent postures, using power spectrum. RESULTS: We employed the ratio of low frequency power to high frequency power (LFP/HFP) to analyze the changes in the ANS. The number of sleep deprivation occurrences in the sitting posture was significantly less than that in the recumbent posture (p<0.01), resulting in smaller increase of LFP/HFP. Although LFP/HFP of the two postures varied with time without any provocation, it was more stable in sitting than in recumbent postures. CONCLUSION: A sitting posture is preferable to a recumbent posture for analyzing HRV, because of decreased drowsiness and sleep deprivation, thereby decreasing variation of LFP/HFP during experiment. Considering the drowsiness, it is also recommended that any experiment should be completed within 15 minutes, if possible.
Subject(s)
Adult , Female , Humans , Male , Electromagnetic Fields , Heart Rate/radiation effects , Posture , Sleep Deprivation/physiopathologyABSTRACT
Eleetromagnutic field of cell Phones may affect the biological systems. This study was done to evaluate the effect of electromagnutic field of mobile phones on blood pressure, heart rate and arytmia on students of Kurdistan University of Medical Science, in West of Iran. In a randomized, double-blind clinical Trial, 56 young healthy volunteers with 20-30 years age were divided in two groups: expousure [n=27] and control [n=29]. Cell phone was kept in front of the heart. Non functional cell phone was used in the control group. Systolic and diastolic blood pressure, heart rate and basic ECG were recorded. The Parameters were recorded in stage one [before sot on cell phone], stage two [the first 5 minutes], stage three [6minutes,with silent ringing], stage four [after 17min conection] and stage five [after 35 min conection]. In all Stages, it was evaluated by cardiac monitoring [Lead 2] for the presence of [sinus arryhthmia, sinus bradycardia, SA block, AV block, PAC and PVC]. Systolic and diastolic blood pressure and heart rate did not show to have any significant differences between two groups in any stages. Rate of sinus arryhthmia was higher in expousure group at stages four and five, but only in stage four, this difference was shown to be significant [P<0.05]. The findings of this study showed that, electromagnetic of cellular phone cause sinus arryhthmia after 17 minute connection, to prevent the side effect of cell phone, we suggest that, cell phone set distant away from heart and reduce the connection time
Subject(s)
Cell Phone , Blood Pressure/radiation effects , Heart Rate/radiation effects , Arrhythmias, Cardiac , Double-Blind MethodABSTRACT
OBJETIVO: la administración de levobupivacaina en el espacio epidural para analgesia del trabajo de parto, en concentración de 0.185% es capaz de producir un efectivo control del dolor del trabajo de parto, sin bloqueo motor, ni efectos sistémicos y fetales indeseables. PACIENTES Y MÉTODOS: el estudio se realizó en las pacientes internadas en la sala de pre-partos del Hospital de La Mujer. Se tomó como muestra un total de 30 pacientes, divididas en dos grupos de estudio Grupo A (n = 15), a las cuales se administrará L-bupivacaina al 0.185% con adición de fentanyl, y un Grupo B (n = 15), al cual se administró bupivacaina al 0.125% más fentanyl. RESULTADOS: la calidad de la analgesia de 0 en todas las pacientes, manteniéndose en este nivel durante todo el trabajo de parto en el 80% de los casos. Ninguna paciente presentó bloqueo motor, ni efectos sistémicos indeseables producidos por la levobupivacaina. En ningún caso las calificaciones de Apgar fueron bajas. La frecuencia cardiaca fetal no presentó alteraciones (p<0.5). La actividad uterina se vio significativamente afectada en el grupo B (p < 0.06). El empleo de oxitocicos en el grupo B fue significativamente mayor (p<0.003). El bloqueo motor fue significativamente menor en el grupo A (p < 0.07).
OBJECTIVES: the administration of l-bupivacaine into the epidural space for getting an obstetric analgesia for labour at 0.185% concentration doesn't has systemic or foetal adverse effects. PATIENTS AND METHODS: the study has been done at the Hospital de la Mujer; on the patients interned to the labour room. A group of 30 women in active labour was divided in two study groups Group A (n=15) who ABSTRACT: received L-bupivacaine 0.185% plus fentanyl, Group B (n=15) who received bupivacaine 0.125% plus fentanyl. RESULTS: we found a quality of analgesia of 0 in all of the patients, maintaining this level during all of the labour time in 80% of the patient. Niether one presented motor blockage, adverse effects produced by the L-bupivacaine. In any case we have seen low Apgar scores. The foetus cardiac frequency has not been affected (p<0.5). The uterine activity has been affected in the B group (p<0.006). The use of oxytocin has been greater in the B group (p<0.003). The motor blockage has been minor in the A group (p<0.07)