keyword
MENU ▼
Read by QxMD icon Read
search

Control of breathing

keyword
https://www.readbyqxmd.com/read/29053946/measurement-of-area-and-personal-breathing-zone-concentrations-of-diesel-particulate-matter-dpm-during-oil-and-gas-extraction-operations-including-hydraulic-fracturing
#1
Eric J Esswein, Marissa Alexander-Scott, John Snawder, Michael Breitenstein
Diesel engines serve many purposes in modern oil and gas extraction activities. Diesel particulate matter (DPM) emitted from diesel engines is a complex aerosol that may cause adverse health effects depending on exposure dose and duration. This study reports on personal breathing zone (PBZ) and area measurements for DPM (expressed as elemental carbon) during oil and gas extraction operations including drilling, completions (which includes hydraulic fracturing) and servicing work. Researchers at the National Institute for Occupational Safety and Health (NIOSH) collected 104 full-shift air samples (49 PBZ and 55 area) in Colorado, North Dakota, Texas, and New Mexico during a four year period from 2008-2012 The arithmetic mean (AM) of the full shift TWA PBZ samples was 10 µg/m(3); measurements ranged from 0...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29052280/reappraisal-of-systemic-venous-chemoreceptors-might-they-explain-the-matching-of-breathing-to-metabolic-rate-in-humans
#2
M J Parkes
What is the topic of this review? One of the major unanswered questions in physiology is that of how breathing matches metabolic rate. Venous chemoreceptors seem to have been dismissed since the 1960s. What advances does it highlight? New evidence shows that their apparent dismissal needs reappraisal. The paper on which this depends has more than one interpretation, and another paper obtained the opposite result. Previous search ignored all locations between skeletal muscle and the right heart. Oxygen sensors other than the arterial chemoreceptors do exist...
October 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29051333/pre-load-corrected-dynamic-starling-mechanism-in-patients-with-heart-failure-with-preserved-ejection-fraction
#3
Michinari Hieda, Erin Howden, Shigeki Shibata, Takashi Tarumi, Justin Stevan Lawley, Christopher M Hearon, M Dean Palmer, Qi Fu, Rong Zhang, Satyam Sarma, Benjamin D Levine
The beat-to-beat dynamic Starling mechanism (DSM), the dynamic modulation of stroke volume (SV) due to breath-to-breath changes in left ventricular end-diastolic pressure (LVEDP), reflects ventricular-arterial coupling. The purpose of this study was to test whether LVEDP-SV relationship remained impaired in HFpEF patients after normalization of LVEDP. Right heart catheterization and model-flow analysis of the arterial pressure waveform were performed while preload was manipulated using lower body negative pressure to alter LVEDP...
October 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29051306/peripheral-chemosensitivity-is-not-blunted-during-2%C3%A2-h-of-thermoneutral-head-out-water-immersion-in-healthy-men-and-women
#4
James R Sackett, Zachary J Schlader, Suman Sarker, Christopher L Chapman, Blair D Johnson
Carbon dioxide (CO2) retention occurs during water immersion, but it is not known if peripheral chemosensitivity is altered during water immersion, which could contribute to CO2 retention. We tested the hypothesis that peripheral chemosensitivity to hypercapnia and hypoxia is blunted during 2 h of thermoneutral head out water immersion (HOWI) in healthy young adults. Peripheral chemosensitivity was assessed by the ventilatory, heart rate, and blood pressure responses to hypercapnia and hypoxia at baseline, 10, 60, 120 min, and post HOWI and a time-control visit (control)...
November 2017: Physiological Reports
https://www.readbyqxmd.com/read/29051226/thermal-tachypnea-in-avian-embryos
#5
Kênia C Bícego, Jacopo P Mortola
Many adult mammals and birds respond to heat with thermal tachypnea, an increase in breathing frequency with shallow tidal volume, with minimal increase in oxygen consumption (V̇O2 ). This pattern favors heat dissipation by evaporative water loss (EWL) through the respiratory tract. We asked to what extent this response was apparent at the earliest stages of development, when pulmonary ventilation (V̇E) initiates. Measurements of V̇E(barometric technique), V̇O2 (open-flow methodology) and EWL (water scrubbers) were performed on chicken embryos at the earliest appearance of V̇E, during the internal pipping stage...
October 19, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29050719/how-is-pulmonary-function-and-exercise-tolerance-affected-in-patients-with-ais-who-have-undergone-spinal-fusion
#6
Kelly A Jeans, John F Lovejoy, Lori A Karol, Anna M McClung
STUDY DESIGN: Prospectively enrolled AIS patients who underwent spinal fusion, with 2 year follow-up. OBJECTIVES: To evaluate the cardiovascular fitness and activity level in patients with AIS pre- and post-spinal fusion and to determine if initial curve magnitude or pulmonary function is predictive of exercise capacity. SUMMARY OF BACKGROUND DATA: Researchers have tried to link pulmonary function testing (PFT) to exercise capacity; the results are mixed...
November 2017: Spine Deformity
https://www.readbyqxmd.com/read/29046872/swallow-breath-interaction-and-phase-of-respiration-with-swallow-during-non-nutritive-suck-in-infants-affected-by-neonatal-abstinence-syndrome
#7
Eric W Reynolds, Debbie Grider, Cynthia S Bell
BACKGROUND: The development of suck-swallow-breath rhythms during non-nutritive suck (NNS) may be an indicator of neurologic integrity. We have described swallow-breath (SwBr) interaction and phase of respiration (POR) with swallow during NNS in low-risk preterm (LRP) infants. NNS in infants with neonatal abstinence syndrome (NAS) has not been described with our method. METHOD: Suckle, swallow, thoracic motion, and nasal airflow were measured during NNS in 10 infants with NAS and 12 unaffected infants (control)...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29046425/carotid-chemoreceptors-tune-breathing-via-multipath-routing-reticular-chain-and-loop-operations-supported-by-parallel-spike-train-correlations
#8
Kendall F Morris, Sarah C Nuding, Lauren S Segers, Kimberly Erin Iceman, Russell O'Connor, Jay B Dean, Mackenzie M Ott, Pierina A Alencar, Dale Shuman, Kofi-Kermit Horton, Thomas E Taylor-Clark, Donald C Bolser, Bruce G Lindsey
We tested the hypothesis that carotid chemoreceptors tune breathing through parallel circuit paths that target distinct elements of an inspiratory neuron chain in the ventral respiratory column (VRC). Microelectrode arrays were used to monitor neuronal spike trains simultaneously in the VRC, peri-nucleus tractus solitarius-medial medulla (p-NTS-MM), the dorsal parafacial region of the lateral tegmental field (FTL-pF), and medullary raphé nuclei together with phrenic nerve activity during selective stimulation of carotid chemoreceptors or transient hypoxia in 19 decerebrate, neuromuscularly-blocked, and artificially ventilated cats...
October 18, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29045708/association-between-polycyclic-aromatic-hydrocarbon-exposure-and-peripheral-blood-mononuclear-cell-dna-damage-in-human-volunteers-during-fire-extinction-exercises
#9
Maria Helena Guerra Andersen, Anne Thoustrup Saber, Per Axel Clausen, Julie Elbæk Pedersen, Mille Løhr, Ali Kermanizadeh, Steffen Loft, Niels Ebbehøj, Åse Marie Hansen, Peter Bøgh Pedersen, Ismo Kalevi Koponen, Eva-Carina Nørskov, Peter Møller, Ulla Vogel
This study investigated a number of biomarkers, associated with systemic inflammation as well as genotoxicity, in 53 young and healthy subjects participating in a course to become firefighters, while wearing personal protective equipment (PPE). The exposure period consisted of a 3-day training course where the subjects participated in various live-fire training exercises. The subjects were instructed to extinguish fires of either wood or wood with electrical cords and mattresses. The personal exposure was measured as dermal polycyclic aromatic hydrocarbon (PAH) concentrations and urinary excretion of 1-hydroxypyrene (1-OHP)...
October 13, 2017: Mutagenesis
https://www.readbyqxmd.com/read/29045567/individualized-positive-end-expiratory-pressure-in-obese-patients-during-general-anaesthesia-a-randomized-controlled-clinical-trial-using-electrical-impedance-tomography
#10
C Nestler, P Simon, D Petroff, S Hammermüller, D Kamrath, S Wolf, A Dietrich, L M Camilo, A Beda, A R Carvalho, A Giannella-Neto, A W Reske, H Wrigge
Background: General anaesthesia leads to atelectasis, reduced end-expiratory lung volume (EELV), and diminished arterial oxygenation in obese patients. We hypothesized that a combination of a recruitment manoeuvre (RM) and individualized positive end-expiratory pressure (PEEP) can avoid these effects. Methods: Patients with a BMI ≥35 kg m-2 undergoing elective laparoscopic surgery were randomly allocated to mechanical ventilation with a tidal volume of 8 ml kg-1 predicted body weight and (i) an RM followed by individualized PEEP titrated using electrical impedance tomography (PEEPIND) or (ii) no RM and PEEP of 5 cm H2O (PEEP5)...
October 16, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29044830/optimal-management-of-apparatus-dead-space-in-the-anesthetized-infant
#11
REVIEW
Michael R King, Jeffrey M Feldman
Mechanical ventilation of the anesthetized infant requires careful attention to equipment and ventilator settings to assure optimal gas exchange and minimize the potential for lung injury. Apparatus dead space, defined as dead space resulting from devices placed between the endotracheal tube and the Y-piece of the breathing circuit, is the primary source of dead space controlled by the clinician. Due to the small tidal volumes required by infants and neonates, it is easy to create excessive apparatus dead space resulting in unintended hypercarbia or increased minute ventilation in an effort to achieve a desirable PCO2 ...
October 17, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/29042870/update-of-minimally-invasive-surfactant-therapy
#12
REVIEW
Gyu-Hong Shim
To date, preterm infants with respiratory distress syndrome (RDS) after birth have been managed with a combination of endotracheal intubation, surfactant instillation, and mechanical ventilation. It is now recognized that noninvasive ventilation (NIV) such as nasal continuous positive airway pressure (CPAP) in preterm infants is a reasonable alternative to elective intubation after birth. Recently, a meta-analysis of large controlled trials comparing conventional methods and nasal CPAP suggested that CPAP decreased the risk of the combined outcome of bronchopulmonary dysplasia or death...
September 2017: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/29042835/double-blind-randomized-placebo-controlled-trial-of-single-dose-intravenous-acetaminophen-for-pain-associated-with-adenotonsillectomy-in-pediatric-patients-with-sleep-disordered-breathing
#13
Arlyne K Thung, Charles A Elmaraghy, N'Diris Barry, Dmitry Tumin, Kris R Jatana, Julie Rice, Vidya Raman, Tarun Bhalla, David P Martin, Marco Corridore, Joseph D Tobias
OBJECTIVES: Adequate pain control is an important component in the postoperative outcome for pediatric adenotonsillectomy patients with sleep-disordered breathing (SDB). Intravenous acetaminophen appears to be a favorable analgesic adjunct owing to its predictable pharmacokinetics and opioid-sparing effects; however, its role in pediatric adenotonsillectomy pain management remains unclear. METHODS: In this prospective, randomized, double-blinded, controlled study, subjects with the diagnosis of SDB, aged 2 to 8 years, who required extended postoperative admission, received intravenous acetaminophen (15 mg/kg) or saline placebo intraoperatively in addition to morphine (0...
September 2017: Journal of Pediatric Pharmacology and Therapeutics: JPPT: the Official Journal of PPAG
https://www.readbyqxmd.com/read/29042272/effect-of-dietary-nitrate-on-respiratory-physiology-at-high-altitude-results-from-the-xtreme-alps-study
#14
Andrew Cumpstey, Philip J Hennis, Edward T Gilbert-Kawai, Bernadette O Fernandez, Matthieu Poudevigne, Alexandra Cobb, Paula Meale, Kay Mitchell, Helen Moyses, Helmut Pöhnl, Monty G Mythen, Michael P W Grocott, Martin Feelisch, Daniel S Martin
Nitric oxide (NO) production plays a central role in conferring tolerance to hypoxia. Tibetan highlanders, successful high-altitude dwellers for millennia, have higher circulating nitrate and exhaled NO (ENO) levels than native lowlanders. Since nitrate itself can reduce the oxygen cost of exercise in normoxia it may confer additional benefits at high altitude. Xtreme Alps was a double-blinded randomised placebo-controlled trial to investigate how dietary nitrate supplementation affects physiological responses to hypoxia in 28 healthy adult volunteers resident at 4559 m for 1 week; 14 receiving a beetroot-based high-nitrate supplement and 14 receiving a low-nitrate 'placebo' of matching appearance/taste...
October 14, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29042002/obstructive-sleep-apnea-syndrome-in-parkinson-s-disease-and-other-parkinsonisms
#15
F Crosta, Giovambattista Desideri, Carmine Marini
An association of obstructive sleep apnea syndrome (OSAS) and other sleep-disordered breathing (SDB) with Parkinson's disease (PD) has been reported in some small studies. In the present study we investigated the occurrence of SDB in a large consecutive outpatient series. This is a case-control study in subjects attending a neurological clinic where all patients were screened for SDB by means of sleep-wake history, Epworth Sleepiness Scale, and full-night polysomnography, when indicated. 3194 patients were recruited...
July 2017: Functional Neurology
https://www.readbyqxmd.com/read/29041938/development-of-breath-test-for-pneumoconiosis-a-case-control-study
#16
Hsiao-Yu Yang, Ruei-Hao Shie, Che-Jui Chang, Pau-Chung Chen
BACKGROUND: Lipid peroxidation plays an important role in the pathogenesis of pneumoconiosis. Volatile organic compounds (VOCs) generated from lipid peroxidation might be used to detect pneumoconiosis. The objective of this study was to develop a breath test for pneumoconiosis. METHODS: A case-control study was designed. Breath and ambient air were analysed by gas chromatography/mass spectrometry. After blank correction to prevent contamination from ambient air, we used canonical discriminant analysis (CDA) to assess the discrimination accuracy and principal component analysis (PCA) to generate a prediction score...
October 17, 2017: Respiratory Research
https://www.readbyqxmd.com/read/29040352/preoperative-respiratory-physiotherapy-in-abdominoplasty-patients
#17
Maria Amélia Rodrigues, Lydia Masako Ferreira, Eliziane Nitz de Carvalho Calvi, Fábio Xerfan Nahas
Background: After abdominoplasty, patients experience decreased ventilatory function and increased intra-abdominal pressure (IAP). Breathing exercises are used during the pre- and postoperative periods of several abdominal surgeries to prevent or minimize postoperative complications. Objectives: The aim of this study was to assess the effect of preoperative respiratory physiotherapy on the outcome of abdominoplasty patients. Methods: Thirty-three patients were divided into 2 groups...
June 28, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/29038042/relationship-between-catamenial-pneumothorax-or-non-catamenial-pneumothorax-and-endometriosis
#18
Togas Tulandi, Christian Sirois, Hussein Sabban, Aviad Cohen, Ally Murji, Sukhbir S Singh, Innie Chen, Liane Belland
STUDY OBJECTIVES: To evaluate the clinical characteristics of women presenting with catamenial pneumothorax and compare them with those with non-catamenial pneumothorax. DESIGN: Case control study (Canadian Task Force II-2). SETTING: Multicenter study PATIENTS: 42 women with pneumothorax; 21 women had catamenial pneumothorax (study group) and 21 age-matched women with non-catamenial pneumothorax (control group). INTERVENTIONS: All patients underwent video-assisted thoracoscopy (VATS) and pleural biopsy...
October 13, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29037544/effects-of-pushing-techniques-during-the-second-stage-of-labor-a%C3%A2-randomized-controlled-trial
#19
Refika Genç Koyucu, Nurdan Demirci
OBJECTIVE: Spontaneous pushing is a method that is used in the management of the second stage of labor and suggested to be more physiological for the mother and infant. The present study aims to evaluate the effects of pushing techniques on the mother and newborn. MATERIALS AND METHODS: This randomized prospective study was performed between June 2013-March 2014 in a tertiary maternity clinic in Istanbul. 80 low risk, nulliparous cases were randomized to pushing groups...
October 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29037252/experiences-of-midwives-on-pharmacological-and-non-pharmacological-labour-pain-management-in-ghana
#20
Lydia Aziato, Abigail A Kyei, Godsway Deku
BACKGROUND: Due to the debilitating effects of severe labour pains, labour pain management continues to be an important subject that requires much attention. Thus, this study sought to gain a detailed insight into the experiences of midwives on pharmacological and non-pharmacological labour pain management strategies in a resource limited clinical context. METHODS: A descriptive exploratory qualitative design was adopted for this study which allowed in-depth follow-up of the midwives' comments resulting in a full understanding of emerging findings...
October 16, 2017: Reproductive Health
keyword
keyword
101463
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"