Archive for the 'One-lung Ventilation' Category

Verhage RJJ, Boone J, Rijkers GT, et al. Reduced local immune response with continuous positive airway pressure during one-lung ventialtion for oesophagectomy, Br. J Anaesth 2014, advanced online access Feb. 11, 2014

Background. Transthoracic oesophagectomy requires prolonged one-lung ventilation causing
systemic and local inflammatory responses. Application of continuous positive airway
pressure (CPAP) to the collapsed lung potentially reduces pulmonary damage, hypoxia, and
consequent inflammation. This randomized controlled trial studied the influence of CPAP
applied to the collapsed right lung during thoracoscopic oesophagectomy on local and
systemic inflammatory response.
Methods. Broncho-alveolar lavage fluid (BALF) fromthe right collapsedandleft ventilated lung
and serum samples were obtained during surgery from 30 patients undergoing
thoracolaparoscopic oesophagectomy for cancer who were randomized for one-lung
ventilation with or without CPAP applied to the collapsed right lung. Concentrations of
cytokines and chemokines, in BALF and serum, were determined with Luminex.
Results. Patients fromthe control (no CPAP) group had significantly increased concentrations of
interleukin (IL)-1a, IL-1b, IL-10, tumour necrosis factor-alpha, macrophage inflammatory
protein (MIP)-1a, pulmonary and activation-regulated chemokine (PARC), and IL-8 in the
collapsed (right) lung when compared with patients from the CPAP group (P,0.05). The
ventilated (left) lung of the control group showed increased concentrations of monocyte
chemoattractant protein (MCP)-1 and MIP-1a (P,0.05). Serum concentrations of cytokines
and chemokines increased during surgery, but did not differ between the control and CPAP
groups.
Conclusions. A significantly lower local immune response was observed during one-lung
ventilation when CPAP was applied to the collapsed lung. The findings suggest a beneficial
effect of CPAP on the collapsed lung during oesophagectomy with one-lung ventilation

One-lung Ventilation p.slinger 12:26 PM Comments Off

Intravenous versus inhalation anaesthesia for one-lung ventilation.Modolo, SP Norma. Modolo, Marilia P. Marton, Marcos A. Volpato, Enilze. Monteiro Arantes, Vinicius. do Nascimento Junior, Paulo. El Dib, Regina P. Cochrane Anaesthesia Group Cochrane Database of Systematic Reviews. 7, 2013.

AB Background This is an update of a Cochrane Review first published in The Cochrane Library, Issue 2, 2008. Objectives The objective of this review was to evaluate the effectiveness and safety of intravenous versus inhalation anaesthesia for one-lung ventilation. Search methods We searched the Cochrane Central Register of Controlled Trials (CENTRAL); The Cochrane Library (2012, Issue 11); MEDLINE (1966 to November 2012); EMBASE (1980 to November 2012); Literatura Latino-Americana e do Caribe em Ciencias da Saude (LILACS, 1982 to November 2012) and ISI web of Science (1945 to November 2012), reference lists of identified trials and bibliographies of published reviews. We also contacted researchers in the field. No language restrictions were applied. The date of the most recent search was 19 November 2012. The original search was performed in June 2006. Selection criteria We included randomized controlled trials and quasi-randomized controlled trials of intravenous (e.g. propofol) versus inhalation (e.g. isoflurane, sevoflurane, desflurane) anaesthesia for one-lung ventilation in both surgical and intensive care participants. We excluded studies of participants who had only one lung (i.e. pneumonectomy or congenital absence of one lung). Data collection and analysis Two review authors independently assessed trial quality and extracted data. We contacted study authors for additional information. Main results We included in this updated review 20 studies that enrolled 850 participants, all of which assessed surgical participants[FULLWIDTH HYPHEN-MINUS]no studies investigated one-lung ventilation performed outside the operating theatre. No evidence indicated that the drug used to maintain anaesthesia during one-lung ventilation affected participant outcomes. The methodological quality of the included studies was difficult to assess as it was reported poorly, so the predominant classification of bias was ‘unclear’. Authors’ conclusions Very little evidence from randomized controlled trials suggests differences in participant outcomes with anaesthesia maintained by intravenous versus inhalational anaesthesia during one-lung ventilation. If researchers believe that the type of drug used to maintain anaesthesia during one-lung ventilation is important, they should design randomized controlled trials with appropriate participant outcomes, rather than report temporary fluctuations in physiological variables.

General & One-lung Ventilation p.slinger 2:22 PM Comments Off

Alveolar recruitment improves ventilation during thoracic surgery: a randomized controlled trial. Unzueta C, Tusman G, Suarez-Shipmann F, et al. Br J Anesth epub Dec. 26, 2011

Background. This study was conducted to determine whether an alveolar recruitment
strategy (ARS) applied during two-lung ventilation (TLV) just before starting one-lung
ventilation (OLV) improves ventilatory efficiency.
Methods. Subjects were randomly allocated to two groups: (i) control group: ventilation with
tidal volume (VT) of 8 or 6 ml kg21 for TLV and OLV, respectively, and (ii) ARS group: same
ventilatory pattern with ARS consisting of 10 consecutive breaths at a plateau pressure of
40 and 20 cm H2O PEEP applied immediately before and after OLV. Volumetric capnography
and arterial blood samples were recorded 5 min (baseline) and 20 min into TLV, at 20 and
40 min during OLV, and finally 10 min after re-establishing TLV.
Results. Twenty subjects were included in each group. In all subjects, the airway
component of dead space remained constant during the study. Compared with baseline,
the alveolar dead space ratio (VDalv/VTalv) increased throughout the protocol in the
control but decreased in the ARS group. Differences in VDalv/VTalv between groups were
significant (P,0.001). Except for baseline, all PaO2 values in kPa (SD) were higher in the
ARS than in the control group (P,0.001), respectively [70 (7) and 55 (9); 33 (9) and 24
(10); 33 (8) and 22 (10); 70 (7) and 55 (10)].
Conclusions. Recruitment of both lungs before instituting OLV not only decreased alveolar
dead space but also improved arterial oxygenation and the efficiency of ventilation.
Keywords: lung, atelectasis; lung, gas exchange; surgery, thoracic; ventilation, dead space;
ventilation, one-lung ventilation

One-lung Ventilation p.slinger 2:15 PM Comments Off

Ventilatory protective strategies during thoracic anesthesia. Kozian A, et al. Anesthesiology 2011; 114: 1025-35

Background: The increased tidal volume (VT) applied tothe ventilated lung during one-lung ventilation (OLV) enhancescyclic alveolar recruitment and mechanical stress. It isunknown whether alveolar recruitment maneuvers (ARMs)and reduced VT may influence tidal recruitment and lungdensity. Therefore, the effects of ARM and OLV with differentVT on pulmonary gas/tissue distribution are examined.Methods: Eight anesthetized piglets were mechanically ventilated(VT 10 ml/kg). A defined ARM was applied to thewhole lung (40 cm H2O for 10 s). Spiral computed tomographiclung scans were acquired before and after ARM.Thereafter, the lungs were separated with an endobronchialblocker. The pigs were randomized to receive OLV in thedependent lung with aVT of either 5 or 10 ml/kg. Computedtomography was repeated during and after OLV. The voxelswere categorized by density intervals (i.e., atelectasis, poorlyaerated, normally aerated, or overaerated). Tidal recruitmentwas defined as the addition of gas to collapsed lung regions.Results: The dependent lung contained atelectatic (5610 ml),poorly aerated (18310 ml), and normally aerated (18729 ml)regions before ARM. After ARM, lung volume and aeration increased(42635 vs. 52669 ml). Respiratory compliance enhanced,and tidal recruitment decreased(95%vs.79%of the wholeend-expiratory lung volume).OLVwith10ml/kgfurther increasedaeration (atelectasis, 152 ml; poorly aerated, 9424 ml; normallyaerated, 580 98 ml) and tidal recruitment (81% of thedependent lung). OLV with 5 ml/kg did not affect tidal recruitmentor lung density distribution. (Data are given as meanSD.)Conclusions: The ARM improves aeration and respiratorymechanics. In contrast to OLV with high VT, OLV withreduced VT does not reinforce tidal recruitment, indicatingdecreased mechanical stress.

One-lung Ventilation p.slinger 1:09 PM Comments Off

Does a Protective Ventilation Strategy Reduces the Risk of Pulmonary Complications Following Lung Cancer Surgery. Yang M, Ahn H, Kim K, et al. Chest 2010, Epub

Background: Protective ventilation strategy has been shown to reduce ventilator-induced
lung injury in ARDS patients. In this study, we questioned whether protective ventilatory
settings would attenuate lung impairment during one lung ventilation (OLV) compared to
conventional ventilation in patients undergoing lung resection surgery.
Methods: One hundred ASA 1-2 patients scheduled for an elective lobectomy were
enrolled in the study. During OLV, two different ventilation strategies were compared. The
conventional strategy (CV group, n=50) consisted of FiO2 1.0, VT 10 ml/kg, ZEEP, and
volume-controlled ventilation, while the protective strategy (PV group, n=50) consisted of
FiO2 0.5, VT 6 ml/kg, PEEP 5 cm H2O, and pressure-controlled ventilation. The composite
primary endpoint included, PaO2/FiO2 < 300 mmHg and/or the presence of newly developed
lung lesions (lung infiltration and atelectasis) within 72 hours of the operation. To monitor
safety during OLV, SpO2, PaCO2, and PIP were repeatedly measured.
Results: During OLV, although 58% of the PV group needed elevated FiO2 to maintain an
SpO2 above 95%, PIP was significantly lower than in the CV group whereas the mean PaCO2
values remained at 35-40 mmHg in both groups. Importantly, in the PV group, the incidence
of the primary endpoint of pulmonary dysfunction was significantly lower than in the CV
group (the incidence of PaO2/FiO2 < 300 mmHg, lung infiltration, or atelectasis : 4% vs. 22%,
P < 0.05).
Conclusion: Compared with the traditional large VT and volume-controlled ventilation, the
application of small VT and PEEP through pressure-controlled ventilation was associated with
a lower incidence of postoperative lung dysfunction and satisfactory gas exchange.

One-lung Ventilation p.slinger 4:18 PM Comments Off

Pressure-controlled ventilation and intrabronchial pressure. H Rose , et al. Br J Anaesth 2010, 105 (3): 377-81

Background. Pressure-controlled ventilation (PCV) has been suggested to reduce peak
airway pressure (Ppeak) and intrapulmonary shunt during one-lung ventilation (OLV) when
compared with volume-controlled ventilation (VCV). At the same tidal volume (VT), the
apparent difference in Ppeak is mainly related to the presence of a double-lumen tracheal
tube. We tested the hypothesis that the decrease in Ppeak observed in the breathing
circuit is not necessarily associated with a decrease in the bronchus of the dependent lung.
Methods. This observational study included 15 consecutive subjects who were ventilated
with VCV followed by PCV at constant VT. Airway pressure was measured simultaneously in
the breathing circuit and main bronchus of the dependent lung after 20 min of ventilation.
Results. PCV induced a significant decrease in Ppeak [mean (SD)] measured in the breathing
circuit [36 (4) to 26 (3) cm H20, P,0.0001] and in the bronchus [23 (4) to 22 (3) cm H2O,
P¼0.01]. However, the interaction (ventilatory mode × site of measurement) revealed that
the decrease in Ppeak was significantly higher in the circuit (P,0.0001). Although the mean
percentage decrease in Ppeak was significant at both sites, the decrease was significantly
lower in the bronchus [5 (6)% vs 29 (3)%, P,0.0001].
Conclusions. During PCV for OLV, the decrease in Ppeak is observed mainly in the respiratory
circuit and is probably not clinically relevant in the bronchus of the dependent lung. This
challenges the common clinical perception that PCV offers an advantage over VCV during
OLV by reducing bronchial Ppeak.

One-lung Ventilation p.slinger 7:42 AM Comments Off

Inhaled Epoprostenol DuringOne-Lung Ventilation. Karthik R,et al. Ann Thorac Surg 2010, 89: 981-3

We used inhaled epoprostenol (with intravenous phenylephrine)
during one-lung ventilation to improve oxygenation
in a patient with severe interstitial lung disease
undergoing video-assisted thoracoscopic surgery. The
pharmacologic manipulation of pulmonary blood flow
remains an underused strategy for the management of
hypoxemia during one-lung ventilation.

One-lung Ventilation p.slinger 7:59 AM Comments Off

Intermittent positive airway pressure to manage hypoxia during one-lung anaesthesia. W. J. Russell. Anaesth Intensive Care 2009; 37: 432-434

The effect of intermittent positive airway pressure to the non-ventilated lung was assessed in 10 patients who
desaturated during one-lung ventilation. Once their saturation fell below 95% they were given a slow inflation of
2 l/min of oxygen into the non-ventilated lung for two seconds. This was repeated every 10 seconds for five minutes
or until the saturation rose to 98%, whichever was sooner. The initial mean SpO2 was 89.3%±4.2%. All 10
patients had an increase in saturation. The mean saturation following intermittent positive airway pressure was
96.5%±1.6% (P <0.0001). Similarly, the mean oxygen tension rose from 67.2±12.8 mmHg to 98.9±19.8 mmHg.
Intermittent positive airway pressure should be considered for patients who desaturate while undergoing
one-lung ventilation.

One-lung Ventilation p.slinger 7:36 AM Comments Off

Anesthetic-induced Improvement of the Inflammatory Response to One-lung Ventilation. De Conno E, Steurer MP, Wittlinger M, et al. Anesthesiology 2009, 110: 1316-1326

Background: Although one-lung ventilation (OLV) has become
an established procedure during thoracic surgery, sparse
data exist about inflammatory alterations in the deflated, reventilated
lung. The aim of this study was to prospectively investigate
the effect of OLV on the pulmonary inflammatory response
and to assess possible immunomodulatory effects of the anesthetics
propofol and sevoflurane.
Methods: Fifty-four adults undergoing thoracic surgery with
OLV were randomly assigned to receive either anesthesia with
intravenously applied propofol or the volatile anesthetic
sevoflurane. A bronchoalveolar lavage was performed before
and after OLV on the lung side undergoing surgery. Inflammatory
mediators (tumor necrosis factor , interleukin 1, interleukin
6, interleukin 8, monocyte chemoattractant protein 1)
and cells were analyzed in lavage fluid as the primary endpoint.
The clinical outcome determined by postoperative adverse
events was assessed as the secondary endpoint.
Results: The increase of inflammatory mediators on OLV was
significantly less pronounced in the sevoflurane group. No difference
in neutrophil recruitment was found between the
groups. A positive correlation between neutrophils and mediators
was demonstrated in the propofol group, whereas this
correlation was missing in the sevoflurane group. The number
of composite adverse events was significantly lower in the
sevoflurane group.
Conclusions: This prospective, randomized clinical study
suggests an immunomodulatory role for the volatile anesthetic
sevoflurane in patients undergoing OLV for thoracic surgery
with significant reduction of inflammatory mediators and asignificantly better clinical outcome (defined by postoperative adverse events) during sevoflurane anesthesia.

One-lung Ventilation p.slinger 9:00 AM Comments Off

The Use of Air in the Inspired Gas Mixture During Two-Lung Ventilation Delays Lung Collapse During One-Lung Ventilation.Ko, Raynauld, McRae, Karen, Darling, Gail, Waddell, Thomas, MD, PhD, McGlade, Desmond, Cheung, Ken, Katz, Joel, Slinger, Peter. Anesth Analg 2009, 108: 1092-1096

AB BACKGROUND: Collapse of the ipsilateral lung facilitates surgical exposure during thoracic procedures. The use of different gas mixtures during two-lung ventilation (2LV) may improve or impede surgical conditions during subsequent one-lung ventilation (OLV) by increasing or delaying lung collapse. We investigated the effects of three different gas mixtures during 2LV on lung collapse and oxygenation during subsequent OLV: Air/Oxygen (fraction of inspired oxygen [Fio2] = 0.4), Nitrous Oxide/Oxygen (“N2O,” Fio2 = 0.4) and Oxygen (“O2,” Fio2 = 1.0). METHODS: Subjects were randomized into three groups: Air/Oxygen (n = 33), N2O (n = 34) or O2 (n = 33) and received the designated gas mixture during induction and until the start of OLV. Subjects’ lungs in all groups were then ventilated with Fio2 = 1.0 during OLV. The surgeons, who were blinded to the randomization, evaluated the lung deflation using a verbal rating scale at 10 and 20 min after the start of OLV. Serial arterial blood gases were performed before anesthesia induction, during 2LV, and every 5 min, for 30 min, after initiation of OLV. RESULTS: The use of air in the inspired gas mixture during 2LV led to delayed lung deflation during OLV, whereas N2O improved lung collapse. Arterial oxygenation was significantly improved in the O2 group only for the first 10 min of OLV, after which there were no differences in mean Pao2 values among groups. CONCLUSIONS: De-nitrogenation of the lung during 2LV is a useful strategy to improve surgical conditions during OLV. The use of Fio2 1.0 or N2O/O2 (Fio2 0.4) during 2LV did not have an adverse effect on subsequent oxygenation during OLV. (C) 2009 by International Anesthesia Research Society.

One-lung Ventilation p.slinger 3:01 PM Comments Off

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