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Hypercapnia

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https://www.readbyqxmd.com/read/28803335/intraoperative-ventilation-during-thoracoscopic-repair-of-neonatal-congenital-diaphragmatic-hernia
#1
Tadaharu Okazaki, Manabu Okawada, Junya Ishii, Hiroyuki Koga, Go Miyano, Takashi Doi, Yuki Ogasawara, Geoffrey J Lane, Atsuyuki Yamataka
PURPOSE: To evaluate the optimal ventilation mode during thoracoscopic repair (TR) of neonatal congenital diaphragmatic hernia (CDH), we compared high-frequency oscillatory ventilation (HFOV) with conventional mechanical ventilation (CMV). METHODS: Twenty-three neonatal CDH cases who underwent TR without intraoperative inhalation of nitric oxide at our institution between 2007 and 2016 were reviewed. Patients were initially ventilated with HFOV, which was converted to CMV if the HFOV settings were decreased to FiO2 <0...
August 12, 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/28802605/laparoscopic-cholecystectomy-under-neuraxial-anesthesia-compared-with-general-anesthesia-systematic-review-and-meta-analyses
#2
REVIEW
Marcelo A Longo, Bárbara T Cavalheiro, Getúlio R de Oliveira Filho
BACKGROUND: Pneumoperitoneum during laparoscopic cholecystectomy (LC) can cause hypercapnia, hypoxemia, hemodynamic changes and shoulder pain. General anesthesia (GA) enables the control of intraoperative pain and ventilation. The need for GA has been questioned by studies suggesting that neuraxial anesthesia (NA) is adequate for LC. STUDY OBJECTIVE: To quantify the prevalence of intraoperative pain and to verify whether evidence on the maintenance of ventilation, circulation and surgical anesthesia during NA compared with GA is consistent...
September 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28801916/adenosine-and-dopamine-oppositely-modulate-a-hyperpolarization-activated-current-ih-in-chemosensory-neurons-of-the-rat-carotid-body-in-co-culture
#3
Min Zhang, Cathy Vollmer, Colin A Nurse
Adenosine and dopamine (DA) act as neurotransmitters or neuromodulators at the carotid body (CB) chemosensory synapse, however, their mechanisms of action are not fully understood. Using a functional co-culture model of rat CB chemoreceptor (type I) cell clusters and juxtaposed afferent petrosal neurons (PNs), we tested the hypothesis that adenosine and DA act postsynaptically to modulate a hyperpolarization-activated, cyclic nucleotide-gated (HCN) cation current (Ih ). In whole-cell recordings from hypoxia-responsive PNs, cAMP mimetics enhanced Ih whereas the HCN blocker ZD7288 (2 μm) reversibly inhibited Ih ...
August 12, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28801335/hypercapnia-induced-cerebral-oedema-in-a-patient-with-copd-exacerbation-a-rare-and-under-recognised-entity
#4
Siddique Chaudhary, Ahsan Wahab, Shiny Varghese, Susan Jane Smith
No abstract text is available yet for this article.
August 11, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28799178/retrospective-cohort-study-shows-that-the-risks-for-retinopathy-of-prematurity-included-birth-age-and-weight-medical-conditions-and-treatment
#5
Aliaa Adel Ali, Nancy Gomaa, Ahmed Reda Awadein, Huda Hussein Al-Hayouti, Ahmed Hegazy
AIM: This study described the characteristics and risk factors of neonates who developed retinopathy of prematurity (ROP) and severe treatable ROP in two Egyptian neonatal intensive care units (NICUs). METHODS: This retrospective cohort study comprised 108 preterm neonates who were screened for ROP after being admitted to the two NICUs run by Cairo University Hospital from June 2014 to May 2015. Patients were examined using digital fundus photography and indirect ophthalmoscopy was performed if ROP was detected...
August 11, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28798922/practical-approach-to-the-patient-with-acute-neuromuscular-weakness
#6
REVIEW
Rajeev Nayak
Acute neuromuscular paralysis (ANMP) is a clinical syndrome characterized by rapid onset muscle weakness progressing to maximum severity within several days to weeks (less than 4 wk). Bulbar and respiratory muscle weakness may or may not be present. It is a common neurological emergency which requires immediate and careful investigations to determine the etiology because accurate diagnosis has significant impact on therapy and prognosis. Respiratory failure caused by neuromuscular weakness is considered as more critical than lung disease because its development may be insidious or subtle until sudden decompensation leads to life threatening hypoxia...
July 16, 2017: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/28791759/spatial-distribution-of-flow-and-oxygenation-in-the-cerebral-venous-drainage-system
#7
Jill B De Vis, Hanzhang Lu, Harshan Ravi, Jeroen Hendrikse, Peiying Liu
PURPOSE: To investigate the venous oxygenation and flow in the brain, and determine how they might change under challenged states. MATERIALS AND METHODS: Eight healthy human subjects (24-37 years) were studied. T2 -relaxation under spin tagging (TRUST) magnetic resonance imaging (MRI) and phase-contrast MRI were performed to measure venous oxygenation and venous blood flow, respectively, in the superior sagittal sinus (SSS), the straight sinus (SS), and the internal jugular veins (IJVs)...
August 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28782872/the-role-of-vascular-resistance-in-bold-responses-to-progressive-hypercapnia
#8
James Duffin, Olivia Sobczyk, Adrian Crawley, Julien Poublanc, Lashmi Venkatraghavan, Kevin Sam, Alan Mutch, David Mikulis, Joseph Fisher
The ability of the cerebral vasculature to regulate vascular diameter, hence resistance and cerebral blood flow (CBF), in response to metabolic demands (neurovascular coupling), and perfusion pressure changes (autoregulation) may be assessed by measuring the CBF response to carbon dioxide (CO2 ). In healthy individuals, the CBF response to a ramp CO2 stimulus from hypocapnia to hypercapnia is assumed sigmoidal or linear. However, other response patterns commonly occur, especially in individuals with cerebrovascular disease, and these remain unexplained...
August 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28776683/hypercapnia-induced-active-expiration-increases-in-sleep-and-enhances-ventilation-in-unanaesthetized-rats
#9
Isabela P Leirão, Carlos A Silva, Luciane H Gargaglioni, Glauber S F da Silva
Expiration is passive at rest but becomes active through recruitment of abdominal muscles under increased respiratory drive. Hypercapnia-induced active expiration has not been well explored in unanaesthetized rats. We hypothesized that (i) CO2 -evoked active expiration is recruited in a state-dependent manner i.e. differently in sleep or wakefulness and (ii) that recruitment of active expiration enhances ventilation, hence having an important functional role in meeting metabolic demand. To test these hypotheses Wistar rats (280-330 g) were implanted with electrodes for electroencephalography (EEG) and electromyography (EMG) of the neck, diaphragm (DIA) and abdominal (ABD) muscles...
August 3, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28775068/active-sleep-unmasks-apnea-and-delayed-arousal-in-infant-rat-pups-lacking-central-serotonin
#10
Jacob O Young, Aron M Geurts, Matthew Robert Hodges, Kevin J Cummings
Sudden Infant Death Syndrome (SIDS), occurring during sleep periods, is highly associated with abnormalities within serotonin (5-HT) neurons, including reduced 5-HT. There is evidence that future SIDS cases experience more apnea and have abnormal arousal from sleep. In rodents, a loss of 5-HT neurons is associated with apnea in early life and, in adulthood, delayed arousal. As the activity of 5-HT neurons changes with vigilance state, we hypothesized that the degree of apnea and delayed arousal displayed by rat pups specifically lacking central 5-HT varies with state...
August 3, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28750024/applying-time-frequency-analysis-to-assess-cerebral-autoregulation-during-hypercapnia
#11
Michał M Placek, Paweł Wachel, D Robert Iskander, Peter Smielewski, Agnieszka Uryga, Arkadiusz Mielczarek, Tomasz A Szczepański, Magdalena Kasprowicz
OBJECTIVE: Classic methods for assessing cerebral autoregulation involve a transfer function analysis performed using the Fourier transform to quantify relationship between fluctuations in arterial blood pressure (ABP) and cerebral blood flow velocity (CBFV). This approach usually assumes the signals and the system to be stationary. Such an presumption is restrictive and may lead to unreliable results. The aim of this study is to present an alternative method that accounts for intrinsic non-stationarity of cerebral autoregulation and the signals used for its assessment...
2017: PloS One
https://www.readbyqxmd.com/read/28744647/antioxidant-and-antiamnestic-effects-of-potassium-comenate-and-comenic-acid-under-conditions-of-normobaric-hypoxia-with-hypercapnia
#12
L V Shurygina, E I Zlishcheva, A N Kravtsova, A A Kravtsov
Potassium comenate and comenic acid exhibit manifest and virtually identical antioxidant activity under conditions of hypoxia with hypercapnia. The effects of these drugs on conditioned reflex training with positive reinforcement differ significantly. Potassium comenate promotes retention of the learning capacity and memory in hypoxic rats at the level of intact control, that is, exhibits a pronounced protective antiamnestic effect, while comenic acid only facilitates training of the conditioned reflex with positive reinforcement...
July 26, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28743403/obesity-hypoventilation-syndrome-and-associated-factors
#13
Ana Espínola Rodríguez, Luis Lores Obradors, Neus Parellada Esquius, Felisa Rubio Muñoz, Neus Espinosa Gonzalez, Elisabet Arellano Marcuello
BACKGROUND AND OBJECTIVES: Obesity causes important alterations in the respiratory physiology like sleep obstructive apnoea (SOA) and obesity-hypoventilation syndrome (OHS), both associated with high morbidity and mortality. Also, these entities are clearly infradiagnosed and in the case of OHS the prevalence is unknown in the general obese population. To determine the prevalence of OHS in the population of patients with morbid obesity and to know the comorbidity related with OHS, the associated respiratory symptoms and the pulse oximetry alterations...
July 22, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28743265/the-predictive-value-of-respiratory-function-tests-for-non-invasive-ventilation-in-amyotrophic-lateral-sclerosis
#14
T B M Tilanus, J T Groothuis, J M C TenBroek-Pastoor, T B Feuth, Y F Heijdra, J P L Slenders, J Doorduin, B G Van Engelen, M J Kampelmacher, J Raaphorst
BACKGROUND: Non-invasive ventilation (NIV) improves survival and quality of life in amyotrophic lateral sclerosis (ALS) patients. The timing of referral to a home ventilation service (HVS), which is in part based on respiratory function tests, has shown room for improvement. It is currently unknown which respiratory function test predicts an appropriate timing of the initiation of NIV. METHODS: We analysed, retrospectively, serial data of five respiratory function tests: forced vital capacity (FVC), peak cough flow (PCF), maximum inspiratory and expiratory pressure (MIP and MEP) and sniff nasal inspiratory pressure (SNIP) in patients with ALS...
July 25, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28740647/hypercapnia-during-acute-respiratory-distress-syndrome-the-tree-that-hides-the-forest
#15
EDITORIAL
Xavier Repessé, Antoine Vieillard-Baron
No abstract text is available yet for this article.
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28738382/advanced-concepts-in-the-pathophysiology-of-obstructive-sleep-apnea
#16
David P White
The primary pathological event in the disorder obstructive sleep apnea (OSA) is the partial or complete closure of the pharyngeal airway during sleep in an individual with a widely patent airway during wakefulness. This yields an apnea or hypopnea with resulting hypoxia and hypercapnia, and most often requires an arousal to terminate the event. These events occur in a repetitive manner during sleep, yielding intermittent hypoxia and sleep fragmentation with their associated adverse effects on the health and quality of life of the afflicted individual...
2017: Advances in Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28735925/upper-airway-flow-limitation-and-transcutaneous-carbon-dioxide-during-sleep-in-normal-pregnancy
#17
Ville Rimpilä, Riina Jernman, Katariina Lassila, Jukka Uotila, Heini Huhtala, Johanna Mäenpää, Olli Polo
OBJECTIVE: Sleep during pregnancy involves a physiological challenge to provide sufficient gas exchange to the fetus. Enhanced ventilatory responses to hypercapnia and hypoxia may protect from deficient gas exchange, but sleep-disordered breathing (SDB) may predispose to adverse events. The aim of this study was to analyze sleep and breathing in healthy pregnant women compared to non-pregnant controls, with a focus on CO2 changes and upper-airway flow limitation. METHODS: Healthy women in the third trimester and healthy non-pregnant women with normal body mass index (BMI) were recruited for polysomnography...
August 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28731908/prognostic-factors-in-lung-transplantation-after-hematopoietic-stem-cell-transplantation
#18
Toyofumi F Chen-Yoshikawa, Seiichiro Sugimoto, Takeshi Shiraishi, Masato Minami, Yasushi Matsuda, Masayuki Chida, Sumiko Maeda, Akihiro Aoyama, Yoshinori Okada, Meinoshin Okumura, Akinori Iwasaki, Shinichiro Miyoshi, Takahiro Oto, Hiroshi Date
BACKGROUND: Lung transplantation is the final life-saving option for patients with pulmonary complications after hematopoietic stem cell transplantation (HSCT). Patients undergoing HSCT for hematologic diseases are thought to be high-risk candidates for lung transplantation; therefore, few lung transplants are performed for these patients, and few studies have been reported. This study aimed to describe the characteristics and outcomes of lung transplantation in patients with pulmonary complications after HSCT...
July 21, 2017: Transplantation
https://www.readbyqxmd.com/read/28725223/gas-exchange-disturbances-regulate-alveolar-fluid-clearance-during-acute-lung-injury
#19
REVIEW
István Vadász, Jacob I Sznajder
Disruption of the alveolar-capillary barrier and accumulation of pulmonary edema, if not resolved, result in poor alveolar gas exchange leading to hypoxia and hypercapnia, which are hallmarks of acute lung injury and the acute respiratory distress syndrome (ARDS). Alveolar fluid clearance (AFC) is a major function of the alveolar epithelium and is mediated by the concerted action of apically-located Na(+) channels [epithelial Na(+) channel (ENaC)] and the basolateral Na,K-ATPase driving vectorial Na(+) transport...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28721821/current-perspectives-for-the-use-of-gonane-progesteronergic-drugs-in-the-treatment-of-central-hypoventilation-syndromes
#20
Camille Loiseau, Florence Cayetanot, Fanny Joubert, Anne-Sophie Perrin-Terrin, Philippe Cardot, Marie-Noëlle Fiamma, Alain Frugiere, Christian Straus, Laurence Bodineau
BACKGROUND: Central alveolar hypoventilation syndromes (CHS) encompass neurorespiratory diseases resulting from congenital or acquired neurological disorders. Hypercapnia, acidosis, and hypoxemia resulting from CHS negatively affect physiological functions and can be life-threatening. To date, the absence of pharmacological treatment implies that the patients must receive assisted ventilation throughout their lives. OBJECTIVE: To highlight the relevance of determining conditions in which using gonane synthetic progestins could be of potential clinical interest for the treatment of CHS...
July 19, 2017: Current Neuropharmacology
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