Pulse Oxymeter

PURPOSE: To investigate the potential of fMRI to measure changes in fetal tissue oxygenation during acute maternal hypoxia in fetal lambs. MATERIAL AND METHODS: Two ewes carrying singleton fetuses (gestational age 125 and 131 days) underwent MR imaging under inhalation anesthesia. BOLD imaging of the fetal brain, liver and myocardium was performed during acute maternal hypoxia (oxygen replaced by N 2 O). Maternal oxygen saturation and heart rate were monitored by a pulse-oxymeter attached to the maternal tongue...

BACKGROUND: Measurement of systolic arterial blood pressure using a pulse oxymeter involves the evaluation of plethysmographic waveform during inflation and/or deflation of a blood pressure cuff. The purpose of this study was to determine that during slow inflation and deflation of cuff, which one of the pulse oxymetry-based readings of blood pressure is in best agreement with the value obtained by conventional method. METHODS: Blood pressure was measured in a sample of 50 healthy adult volunteers with conventional and pulse oxymetric methods...

OBJECTIVE: This study determined whether alacepril treatment improves exercise hemodynamics in patients with heart failure. METHODS: Supine bicycle ergometer exercise was performed after administration of placebo and after acute and chronic (12 weeks) alacepril treatment in 4 patients with heart failure. Oxygen uptake (VO2), arterial oxygen saturation (SaO2), and mixed venous oxygen saturation (SvO2) were measured continuously using a pulse oxymeter and a fiber optic catheter...

The study was carried out among 41 healthy subjects born in Shanghai (Sea level). They were divided into two groups. Group one (10 subjects) was studied at sea level in a hypobaric chamber (3000m). Group two (31 subjects) was studied in high altitude plateau (Xigatse at 3836m). Arterial oxygen saturation (SaO2), Heart Rate (HR), blood pressure (BP) and myocardial oxygen uptake (MVO2) were measured noninvasively with Nelleor N-200 pulse Oxymeter and HEM-812F-Digital Automatic Blood Pressure Monitor. SaO2 increased significantly (from 87...

We developed a new method of evaluating the tolerance for physical exercise in patients with chronic respiratory disease. Using a newly developed portable pulse oxymeter, with which we could measure kinetic energy (physical activity), calculated from the vertical acceleration involved in physical movements in the patient's daily life, we considered the correlation between the characteristics of the distribution of oxygen saturation (SpO2) and the degree of physical activity. The characteristics of SpO2 distribution in normal healthy subjects are uniform at all degrees of physical activity...

The present study was designed: (1) to establish the effects of transesophageal echocardiography (TEE) on arterial oxygen saturation (SAO(2)%); (2) to verify the possible clinical consequences of this phenomenon; and (3) to study the possibility of predicting modifications of SAO(2)% by clinical or hemodynamic variables or by specific factors related to the TEE procedure. We prospectively studied 116 unselected patients, aged 61 +/- 12 years, who underwent diagnostic TEE for various clinical indications. Thirty-seven patients had mitral valve disease, 19 aortic valve disease, 14 combined mitroaortic disease, 8 congenital heart disease, and 38 other cardiovascular diseases...

The aim of our study was to evaluate the modifications of the respiratory pattern during sleeping in patients with congestive heart failure (CHF) by a simple pulse-oxymetry. We studied 10 subjects (8M/2F), mean age 71.4 +/- 12.4 yrs, admitted to sub-intensive cardiological therapy unit, with diagnosis of CHF due to left ventricular insufficiency by ischemic, hypertensive or idiopathic cardiopathy, when in a stable clinical condition. All patients presented arterial blood gas values within normal limits. The ejection fraction of left ventricle showed a mean value of 30...

UNLABELLED: Some infants show better oxygenation in the prone position compared to the supine position while they are bottle-fed; however, the reason for this phenomenon is not clear. The purpose of this study was to obtain a better understanding of the effects of body position on the oral feeding performance, i.e. the sucking pressure, frequency, efficiency, and ventilation. A total of 14 infants (12 full-term, 2 preterm), who often showed O2 desaturation (SpO2 < 90) during oral feeding, were enrolled in the study...

The hypothesis of this study was that with near infrared spectroscopy a decrease of the regional cerebral saturation would be detectable in patients with increased intracranial pressure. For this purpose, two study groups were compared: (A) eight healthy volunteers and (B) eight heart beating organ donors with brain stem herniation. The regional cerebral saturation was measured according to the developer's suggestions. Mean arterial pressure and peripheral pulse oximetry were recorded. The statistical comparison, using the unpaired t-test, revealed no significant differences for the regional cerebral saturation (p = 0...

We studied 95 patients who underwent knee Arthroscopy under local anaesthesia between JANUARY 1995 till 1997. Materials used were 1% Xylocaine and 0.25% Bupivacaine of 20 mls each combined with midazolam 2 mg and IV pethidine 30 mgm for sedation. The patients were attached to monitors (pulse Oxymeter, ECG and BP and pulse recorders) and blood less field was created using a tornquet. The procedures lasted about 45 minutes. 90 out of 95 patients completed the procedures successfully without any complications...

It is unknown whether daytime features predict oxygenation during sleep in COPD patients with normoxaemia or mild hypoxaemia. In this study our purpose was to evaluate by a pulse oxymeter, nocturnal desaturation in 33 COPD with PaO2 > 60 mmHg and to examine some daytime parameters as possible predictors of nocturnal hypoxaemia. A significant nocturnal desaturation has been defined by spending > or = 30% of total sleep-time with a TSTSaO2 < 90% > 30. According to this criterion we classified our patients in Desaturators (D) and Non Desaturators (ND)...

To compare the effects of salmeterol, an adrenergic drug, and ipratropium bromide, an anticholinergic drug, on breathlessness and gas exchange during exercise in patients with chronic obstructive lung disease (COPD), we performed a progressive treadmill exercise test on 15 patients on 3 days (24 h apart), after inhalation placebo, ipratropium bromide (120 micrograms) or salmeterol (50 micrograms) in a randomized fashion. Dyspnoea during exercise was evaluated from the regression slope between Borg scale (BS) scores and distance walked each minute on the treadmill...

BACKGROUND/PURPOSE: Pulse oximetry has been proposed as an appropriate and feasible technique in the assessment of intestinal ischemia in recent years. In this study the authors aimed to assess the reliability of anastomoses in the dog small intestine in which there is graded irreversible ischemia as measured by pulse oxymeter. METHODS: In a control group of four dogs, without any devascularization, three small bowel anastomoses were formed in each dog. The study group consisted of 12 dogs...

UNLABELLED: Human recombinant interleukin 2 (IL-2), alone or in combination with other cytokines, is currently under investigation for the immunotherapy of metastatic tumours. Objective responses of 20-35% have been reported in patients with disseminated melanoma and renal cell carcinoma who received high-dose intravenous IL-2 in combination with interferon-alpha (IFN alpha). However, treatment with IL-2 is complicated by a syndrome of life-threatening adverse reactions such as disseminated vascular leakage, fluid retention, severe hypotension, and (reversible) multiple organ dysfunction (MODS)...

The monitor plan should be tailored to the individual patient, keeping in mind two main factors: the patient condition and the type of surgery to be performed. The advances in technology have greatly widened the scope of useful information to the physician, though direct contact and observation of the patient still remains the grounding of sound monitoring. In paediatric age the monitoring of breathing is of paramount importance since the high oxygen consumption-FRC oxygen supply ratio make children particularly prone to develop hypoxaemia very quickly...

OBJECTIVES: The aim of the study was to describe the usual conditions of practice of esophagogastroscopy in ambulatory care by French gastroenterologists. METHODS: During a week, a questionnaire was filled out for each esophagogastroscopy performed in ambulatory or day care. RESULTS: Seven hundred and thirty nine gastroenterologists participated in the study (25.9% of French gastroenterologists) and enrolled 4585 patients. Intra-venous sedation was performed in 36...

From April 1992 to May 1994, 780 patients aged from 1 day to 8 years were examined. Sedation of these patients was conducted by giving chlorprothixene orally and, in some cases, chloral hydrate had to be added. The patients were monitored with a pulse oxymeter. Investigations could begin after 50 -120 min. In 710 patients (91%) the first attempt to perform the examination was successful; 70 patients required one or two further attempts. Only two of the 780 patients (0.5%) showed evidence of respiratory depression...

OBJECTIVE: To assess continuous monitoring of fetal blood oxygen staturation (SpO2) during labour using a fetal pulse oxymeter. STUDY DESIGN: Preliminary results obtained with the Nellcor N-400 fetal pulse oxymeter at the Maternité Port-Royal-Baudelocque between November 1992 and November 1993 in cases of abnormal fetal heart rate are presented. We analyzed: the correlation between SpO2 during labour and cord vein pH as well as Apgar score, the correlation between changes in SpO2, expressed as a desaturation index, and cord vein pH as well as Apgar score...

Apnea test for brain death determination is able to perform easily with the method written in Japanese criteria (Brain death study group, Ministry of Health and Welfare, 1987) (Figure 3). PaCO2 is increased to more than 60 mmHg, by which respiratory center in the brain stem is stimulated enough. Hypoxemia may occur and is the most serious complication during apnea test. We examined O2 delivery methods either by a thin cannula inserted to near tracheal carina (Ordinary method, 6 l/min) or by constant flow using a ventilator (6 l/min, or 20 l/min)...

This study was conducted to document the trend in arterial hypoxaemia and electrocardiographic (ECG) abnormalities on second to sixth night after acute myocardial infarction (AMI). Nineteen consecutive patients with AMI were monitored continuously during the night with a Holter tape recorder and a pulse oxymeter. Five patients had > 30 episodic oxygen desaturations of > or = 5%, and many patients had episodes with oxygen desaturations < 80% ranging from 46-61% (from 7/15-11/18) during the nights of monitoring...