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Biomedical subjects

Yakov Sivan

Publications and source records attributed to Yakov Sivan.

15 recordsLinked to original sources
PubMed2006

Diagnosis of laryngomalacia by fiberoptic endoscopy: awake compared with anesthesia-aided technique.

RATIONALE: Fiberoptic flexible laryngoscopy (FFL) is the diagnostic procedure of choice in patients with laryngomalacia. Two techniques can be applied, either when the infant is awake or using anesthesia/sedation. The choice of technique may effect the diagnosis. STUDY OBJECTIVES: To compare the two techniques for diagnosing laryngomalacia. PATIENTS AND INTERVENTIONS: A total of 42 infants who underwent awake fiberoptic laryngoscopy for congenital stridor, in whom either laryngomalacia was diagnosed or no cause for stridor was found, underwent a repeat laryngoscopy using anesthesia/sedation. The 84 video recordings of the supraglottic portions were copied onto a videotape along with 25 recordings of normal upper airways without stridor and 31 duplicate cases with stridor. A total of 140 recordings was mixed at random on a videotape. Sound was not included. MEASUREMENTS: Three investigators (Y.S., J.B.A., and A.D.) independently scored each recording using a laryngomalacia scoring system (scoring range, 0 to 8). RESULTS: A threshold score of 2 was the optimal cutoff point for discriminating laryngomalacia from normal condition. The awake technique (WT) missed three cases of laryngomalacia and overdiagnosed one healthy control subject. The anesthesia technique was superior with a sensitivity of 100%, a specificity of 100%, a positive predictive value of 100%, and a negative predictive value of 100% compared with 93%, 92%, 97%, and 79%, respectively, for the WT. CONCLUSIONS: The diagnosis of laryngomalacia with FFL is more accurate using anesthesia/sedation. The WT may be appropriate for screening or for patients with mild cases having a characteristic presentation.

Anesthesia↗
PubMed2004

The effect of tonsillectomy and adenoidectomy on inattention and impulsivity as measured by the Test of Variables of Attention (TOVA) in children with obstructive sleep apnea syndrome.

OBJECTIVE: To evaluate children with obstructive sleep apnea syndrome (OSAS) for features of attention deficit disorder (ADD) using an objective test of inattention and impulsivity: Test of Variables of Attention (TOVA) and then to determine whether tonsillectomy and adenoidectomy (T+A) results in an improvement in TOVA scores. STUDY DESIGN AND SETTING: This study was a prospective interventional comparative trial in a tertiary care children's hospital. Nineteen children ages 5 to 14 years with OSAS, and otherwise healthy, with a clinical indication for T+A. Preoperative and 2 months postoperative OSA-18, CBCL questionnaires, and TOVA scores were evaluated. RESULTS: The preoperative TOVA scores were in the abnormal range in 12/19 (63%) of the children. The mean preoperative TOVA score was -2.9 (+/- 3.1). The mean postoperative TOVA score was -0.4 (+/-2.8). The improvement in the TOVA scores was significant ( P < 0.0001, t -test). CONCLUSION: This preliminary data suggests that treatment of OSAS with T+A results in significant improvement in objective parameters of inattention and impulsivity. Significance These findings may be important in understanding the impact of OSAS and therapeutic interventions on behavioral problems in children.

Adenoidectomy↗
PubMed2004

The yield of esophageal pH monitoring during polysomnography in infants with sleep-disordered breathing.

This study evaluates the yield of adding simultaneous esophageal pH monitoring to polysomnography (PSG) in 41 infants with unexplained sleep disordered breathing. The relationships of respiratory events to episodes of gastroesophageal reflux (GER) were analyzed. The major causes for referring the infants were cyanotic episodes (22%), apneas (20%), and choking events (15%). PSG was abnormal in 8/41 (20%). Abnormal pH studies were observed in 12/41 (29%) infants. In 4/12 (33%), respiratory events correlated with GER episodes. Adding simultaneous pH monitoring to PSG may identify associated conditions and thus focus treatment.

Esophagus↗
PubMed2004

Normal polysomnographic respiratory values in children and adolescents.

STUDY OBJECTIVES: Polysomnography is important in the evaluation of children and adolescents with sleep-disordered breathing. Adult criteria for obstructive sleep apnea have been shown to be inapplicable to children. Nevertheless, very little data are available regarding normal respiratory parameters during sleep in healthy children and adolescents. The purpose of the study was to characterize normal polysomnography values in healthy children and adolescents and to establish respiratory reference values for pediatric polysomnography. DESIGN, SETTING AND PARTICIPANTS: Seventy healthy, normal children and adolescents were studied. Age ranged from 1 to 15 years (mean +/- SD, 8.02 +/- 4.57 years). All children underwent overnight polysomnography including EEG, electromyography, electrooculography, ECG, pulse oximetry arterial oxygen saturation (SpO(2)), chest wall and abdomen motion, oral and nasal airflow, and end-tidal PCO(2) (PETCO(2)). RESULTS: Three children (4%) had a mean of 0.37 obstructive apneas (OAs) per hour of sleep (1 to 5 OAs per child per study), with mean apnea duration of 10.3 +/- 2.1 s. This was not accompanied with oxygen desaturation. Twenty-six children had one to seven central apneas (CAs) per child, resulting in a mean of 0.4 CAs per hour of sleep (median, 0.33; 97.5 percentile, 0.9). Eleven of the 58 events of CA in six children coincided with oxygen desaturation to a minimum of 88% (nadir apnea desaturation range, 88 to 93%). The mean SpO(2) was 97.2 +/- 0.8% with SpO(2) nadir of 94.6 +/- 2.2%. PETCO(2) > 45 mm Hg occurred for 1.6 +/- 3.8% of total sleep time (TST) in 21 of 70 children (30%), with a distribution of 1.3 +/- 3.03% in the range of 46 to 47 mm Hg; < 0.7% were within the range of 48 to 50 mm Hg; and in 0.29 +/- 0.24% of TST, PETCO(2) values were > 50 mm Hg. CONCLUSIONS: Based on these data, the recommended limits for normal values are as follows: OA index, 1; CA index, 0.9; oxygen desaturation, 89%; baseline saturation, 92%; and PETCO(2) > 45 mm Hg for < 10% of TST.

Adolescent↗
PubMed2004

The yield of flexible fiberoptic bronchoscopy in pediatric intensive care patients.

STUDY OBJECTIVE: To evaluate the contribution of flexible fiberoptic bronchoscopy (FFB) and BAL to the clinical management of patients in a pediatric ICU (PICU). SETTING AND DESIGN: A retrospective study based on medical records in a six-bed pediatric ICU of a tertiary care children's hospital serving as a referral center for airway surgery. PATIENTS AND PARTICIPANTS: One hundred consecutive infants and children hospitalized in a PICU, who underwent FFB with or without BAL. MEASUREMENTS AND RESULTS: One hundred fifty-five procedures were performed, for the following causes: search for airways anatomic pathologies (114 of 155 procedures, 74%), including 55 procedures during the perioperative period of airway surgery; treatment of atelectasis (35 of 155 procedures, 22.5%); and BAL (30 of 155 procedures, 19%). Thirty-five percent of procedures had more than one cause. Airway pathology was observed in 79 of 114 procedures (69%). Management changed from conservative to surgical in 44 of 114 procedures (39%). In airway surgery cases, reoperation subsequent to postoperative FFB took place in 35%. BAL results changed antimicrobial treatment in 15 of 30 cases, with clinical improvement in 10 of 30 cases (33%). Treatment of atelectasis was successful in 26 of 35 cases (74.3%). No procedure-related mortality, life-threatening complications, or significant changes in patient status occurred. CONCLUSIONS: FFB is an important and safe procedure in very sick infants and children with a variety of respiratory diseases, and significantly contributes to their management. FFB should be considered to be a PICU staff expertise.

Adolescent↗
PubMed2004

Sleep position in Israeli Jewish infants following the "back to sleep" campaign.

BACKGROUND: Prone sleeping has been recognized as a risk factor for sudden infant death syndrome. Ten years ago, non-prone sleeping was recommended in many countries around the world including Israel. The rate of infants sleeping prone and the rate of parents' adherence with the recommendations have not been studied. OBJECTIVES: To study infants' sleep position and parents' adherence to recommendations, and to identify risk factors for prone sleeping following the campaign to prevent prone sleeping in the Israeli population. METHODS: We conducted a longitudinal telephone survey with the parents of 608 randomly selected 2 month old infants, repeated at 4 and 6 months. RESULTS: Non-prone sleeping decreased from 75% to 67% and 63% at 2, 4 and 6 months respectively. There was a significant relationship between prone positioning and the use of a home apnea monitor at 2 months (P = 0.038, odds ratio 1.37, 95% confidence interval 0.94-2.15). Other risk factors for prone sleeping were the level of religious practice, with ultra-Orthodox Jews having the highest prevalence (2 months: OR 2.78, 95% CI 1.75-4.55) and higher parity - especially in families with more than five children (P = 0.041). CONCLUSIONS: The prone sleeping position is relatively high in Israel. Groups at high risk were closely associated with the level of religiousness and parity. Efforts to promote supine sleeping should be directed towards identifiable groups.

Female↗
PubMed2003

Obstructive sleep apnea syndrome due to adenotonsillar hypertrophy in infants.

OBJECTIVE: Adenotonsillar hypertrophy (ATH) is the leading cause for obstructive sleep apnea syndrome (OSAS) in children. The peak age for adenoid and tonsillar hypertrophy and related OSAS is 3-6 years. It has been suggested that OSAS due to ATH is extremely rare in infants. The purpose of the present study was to delineate OSAS due to ATH in infants. METHODS: Twenty-nine consecutive infants <18 months of age who underwent polysomnography (PSG) and were diagnosed with OSAS due to ATH were studied. A pediatric sleep questionnaire was completed by parents of all infants. Information regarding demographic variables, referring physician specialty, assessment of infant's development and recurrence of symptoms post treatment was collected. Pre and post surgery body weight and developmental assessment by parents were evaluated. RESULTS: The mean age of adenotonsillectomy was 12.3+/-3.9 months with the mean duration of symptoms ranging 6.2+/-3.0 months. 24% of the infants were born preterm. Snoring was the most common finding and appeared in all infants. Other symptoms were sleep apnea (72%), frequent movements during sleep (69%), mouth breathing (62%) and recurrent awakenings (38%). During the preoperative period, mean body weight decreased from the 67th+/-25 percentile to the 42nd+/-32 percentile (P<0.00001). 14/29 (48%) of the infants dropped two or more major percentiles before treatment. A significant weight gain to the 59th+/-31 percentile was observed post surgery (P<0.0001). 5/29 (17%) infants were considered by their parents as having a developmental delay preoperatively, which resolved in 3/5 (60%) post treatment. Clinical symptoms resolved or improved significantly after surgery. Recurrence of symptoms was documented in 6/23 (26%) of infants. CONCLUSIONS: Infantile OSAS due to hypertrophic adenoids and tonsils does occur in infants. Unique characteristics for this age group include: male predominance, high incidence of preterm infants, failure to gain weight and high recurrence rate after surgery. Otolaryngologists and pediatricians should be aware to the existence of the "early OSAS" in small infants.

Adenoidectomy↗
PubMed2002

Survey of critical care management of severe traumatic head injury in Israel.

OBJECTIVE: To survey the current monitoring and treatment policies for patients with severe traumatic brain injury (STBI) in Israel, and to compare the management of pediatric and adult intensive care units (ICUs). DESIGN: Questionnaires were sent to the medical directors of all ICUs managing STBI patients. RESULTS: All 21 ICUs responded to the questionnaire. All of the units were within tertiary hospitals. An intracranial pressure (ICP) monitoring device was used in over 75% of the patients in 6 out of7 (86%) of the pediatric intensive care units (PICUs), compared with 11 out of 14 (79%) of the adults ICUs. Mannitol was used in all of the units for documented elevated ICP. Mild hyperventilation (4-4.6 kPa) was applied in 52% of the units. Mild hypothermia was routinely used in 4 out of 7 (57%) and hypertonic solutions (NaCI 3%) in 3 out of 7 (43%) of the PICUs, compared with only 2 out of 14 (14%) and none (0%) of the adults ICUs respectively. PICUs aimed for a lower ICP (< or =15 mm Hg) and cerebral perfusion pressure (> or =50 mm Hg) than adult ICUs (< or =20 mm Hg and > or =60 mmHg respectively). Barbiturates were used only in patients with refractory intracranial hypertension. CONCLUSION: This survey reveals a relatively high degree of homogeneity in the treatment of STBI patients in Israel. Most patients are treated in accordance with recently published literature. We attribute this uniformity to the fact that all patients are being treated within tertiary care, university-affiliated centers. PICUs are faster at implementing new modalities of treatment and tend to adopt more aggressive treatment strategies.

Adolescent↗
PubMed2002

Melatonin production in infants.

This study investigated the relationships of the excretion of the melatonin metabolite, 6-sulfatoxymelatonin, to prenatal, natal, and postnatal variables and its possible relation to psychomotor development. nocturnal urinary excretion of 6-sulfatoxymelatonin was studied over a 13-hour period in 355 term infants at 8 weeks of age (n = 320) and 16 weeks of age (n = 96). data on a variety of perinatal factors including pregnancy course, delivery, early postnatal course, birth weight, medical problems, growth (length, weight, and head circumference), and psychomotor development were collected at 1, 3, 6, 9, 12, and 18 months. the relationship between nocturnal 6-sulfatoxymelatonin excretion at 8 and 16 weeks of age and these factors was investigated and analyzed. 6-sulfatoxymelatonin levels at 16 weeks of age were significantly lower in infants with abnormal vs normal development at 3 months of age (7.27 + 1.44 vs 7.97 + 1.06, p = 0.05) as well as at 6 months of age (7.15 + 1.29 vs 7.95 + 1.10, p = 0.04). no other significant relation was evident among growth, perinatal complications, medical problems, and 6-sulfatoxymelatonin excretion at 8 weeks of age and at 16 weeks of age. low melatonin excretion in the first weeks of life correlates with delayed psychomotor achievements at 3 and 6 months of age. this association suggests a causal or predictive link between melatonin and neurodevelopment in infants.

Analysis of Variance↗
PubMed2002

[Obstructive sleep apnea in children--pathophysiology update].

The obstructive sleep apnea syndrome (OSAS) is a common and potentially serious problem during childhood. Airway obstruction during sleep may occur due to narrowed bony passages in conditions such as congenital craniofacial anomalies or in the collapsible segments of the upper airways (naso/hypo pharynx). Adenotonsillar hypertrophy has been considered as the main and most important causative factor for OSAS in the pediatric population. However, adenotonsillar hypertrophy is not the sole cause for this syndrome. Normal infants and children have relatively narrowed upper airways. They maintain airway patency during sleep by increasing the upper airway neuromotor tone and adjusting central ventilatory drive. Recent studies suggest that childhood OSAS is a dynamic process resulting from a combination of structural and neuromotor abnormalities, rather than from structural abnormalities alone. Genetic factors have also been suggested. This review delineates the current concepts of the pathophysiology of OSAS in infants and children.

Child↗
PubMed2002

Continuous renal replacement therapy for non-renal indications: experience in children.

BACKGROUND: The role of continuous renal replacement therapy in patients with acute renal failure is well recognized. CRRT has also become an important modality of treatment in various acute situations without renal failure. OBJECTIVES: To describe our experience with CRRT in acutely ill infants and children without renal failure. METHODS: We analyzed all infants and children who underwent CRRT during the years 1998-2000 in the pediatric intensive care unit and we focus our report on those who were treated for non-renal indications. RESULTS: Fourteen children underwent 16 sessions of CRRT. The indications for CRRT were non-renal in 7 patients (age range 8 days to 16 years, median = 6.5). Three children were comatose from maple syrup urine disease, three were in intractable circulatory failure secondary to septic shock or systemic inflammatory response, and one had sepsis with persistent lactic acidosis and hypernatremia. Three children underwent continuous hemodiafiltration and four had continuous hemofiltration. The mean length of the procedure was 35 +/- 24 hours. All patients responded to treatment within a short period (2-4 hours). No significant complications were observed. Two patients experienced mild hypothermia (34 degrees C), one had transient hypotension and one had an occlusion of the cannula requiring replacement. CONCLUSION: Our findings suggest that CRRT is a safe and simple procedure with a potential major therapeutic value for treating acute non-renal diseases in the intensive care setting.

Adolescent↗