Adverse Events in Pediatric Critical Care Nonsurvivors With a Low Predicted Mortality Risk: A Multicenter Case Control Study.

OBJECTIVES: Some patients with a low predicted mortality risk in the PICU die. The contribution of adverse events to mortality in this group is unknown. The aim of this study was to estimate the occurrence of adverse events in low-risk nonsurvivors (LN), compared with low-risk survivors (LS) and high-risk PICU survivors and nonsurvivors, and the contribution of adverse events to mortality. DESIGN: Case control study. Admissions were selected from the national Dutch PICU registry, containing 53,789 PICU admissions between 2006 and 2017, in seven PICUs. PICU admissions were stratified into four groups, based on mortality risk (low/high) and outcome (death/survival). Random samples were selected from the four groups. Cases were "LN." Control groups were as follows: "LS," "high-risk nonsurvivors" (HN), and "high-risk survivors" (HS). Adverse events were identified using the validated trigger tool method. SETTING: Patient chart review study. PATIENTS: Children admitted to the PICU with either a low predicted mortality risk (< 1%) or high predicted mortality risk (≥ 30%). INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: In total, 419 patients were included (102 LN, 107 LS, 104 HN, and 106 HS). LN had more complex chronic conditions (93.1%) than LS (72.9%; p < 0.01), HN (49.0%; p < 0.001), and HS (48.1%; p < 0.001). The occurrence of adverse events in LN (76.5%) was higher than in LS (13.1%) and HN (47.1%) ( p < 0.001). The most frequent adverse events in LN were hospital-acquired infections and drug/fluid-related adverse events. LN suffered from more severe adverse events compared with LS and HS ( p < 0.001). In 30.4% of LN, an adverse event contributed to death. In 8.8%, this adverse event was considered preventable. CONCLUSIONS: Significant and preventable adverse events were found in low-risk PICU nonsurvivors. 76.5% of LN had one or more adverse events. In 30.4% of LN, an adverse event contributed to mortality.

Increasing the dose of oral vitamin K prophylaxis and its effect on bleeding risk.

Vitamin K prophylaxis in infancy aims to prevent life-threatening vitamin K deficiency bleeding (VKDB). The Dutch prophylactic oral daily regimen was increased sixfold from 25 to 150 µg because of a high failure rate. To evaluate the efficacy of this new regimen, incidences of intracranial VKDB under both regimens were compared using both general and targeted surveillance. Late VKDB in the general pediatric population was identified by the Netherlands Pediatric Surveillance Unit, between 1 October 2014 and 31 December 2016. Additionally, infants with intracranial vitamin K deficiency bleeding were identified using the Dutch Pediatric Intensive Care Evaluation registry. The incidence of intracranial VKDB as assessed by general and targeted surveillance decreased from 1.6 per 100,000 (95% CI, 0.4-5.1) to 1.3 per 100,000 (95% CI, 0.5-3.2) and from 3.1 per 100,000 live births (95% CI, 1.9-5.0) to 1.2 per 100,000 live births (95% CI, 0.6-2.3), respectively. Median time between consecutive cases in the latter increased from 24 to 154 days (p < 0.001).Conclusion: A sixfold increase in oral vitamin K prophylaxis was associated with a surprisingly modest reduction in the incidence of intracranial VKDB, indicating that factors other than the dose need addressing to improve efficacy. What is Known: • The efficacy of intramuscular vitamin K prophylaxis is threatened by an increasing number of parents opting out. • Oral prophylaxis represents an attractive and less invasive alternative but is inferior, especially in infants with malabsorption of vitamin K due to cholestasis. What is New: • Increasing the daily oral dose of vitamin K sixfold had a surprisingly modest effect on the incidence of late vitamin K deficiency bleeding. • This finding indicates that factors other than the dose must play an important role.

Fitness to fly in the paediatric population, how to assess and advice.

The number of children on commercial aircrafts is rising steeply and poses a need for their treating physicians to be aware of the physiologic effects and risks of air travel. The most important risk factors while flying are a decrease in partial oxygen pressure, expansion of trapped air volume, low cabin humidity, immobility, recirculation of air and limited options for medical emergencies. Because on-board medical emergencies mostly concern exacerbations of chronic disease, the medical history, stability of current disease and previous flight experience should be assessed before flight. If necessary, hypoxia altitude simulation testing can be performed to simulate the effects of in-flight hypoxia. Although the literature on paediatric safety of air travel is sparse, recommendations for many different situations can be given. CONCLUSION: We present an overview of the most up to date recommendations to ensure the safety of children during flight. What is Known: • Around 65% of on-board medical emergencies are complications of underlying disease. • In children, the three most common emergencies during flight concern respiratory, neurological and infectious disease. What is New: • Although studies are scarce, some advices to ensure safe air travel can be given for most underlying medical conditions in children, based on physiology, studies in adults and expert opinions. • In former preterm infants without chronic lung disease, hypoxia altitude simulation testing to rule out in-flight desaturation is not recommended.

Tidal volume and mortality in mechanically ventilated children: a systematic review and meta-analysis of observational studies*.

OBJECTIVE: To determine whether tidal volume is associated with mortality in critically ill, mechanically ventilated children. DATA SOURCES: MEDLINE, EMBASE, and CINAHL databases from inception until July 2013 and bibliographies of included studies without language restrictions. STUDY SELECTION: Randomized clinical trials and observational studies reporting mortality in mechanically ventilated PICU patients. DATA EXTRACTION: Two authors independently selected studies and extracted data on study methodology, quality, and patient outcomes. Meta-analyses were performed using the Mantel-Haenszel random-effects model. Heterogeneity was quantified using I. Study quality was assessed using the Newcastle-Ottawa Score for cohort studies. DATA SYNTHESIS: Out of 142 citations, seven studies met the inclusion criteria, and additional two articles were identified from references of the found articles. One was excluded. These eight studies included 1,756 patients. Mortality rates ranged from 13% to 42%. There was no association between tidal volume and mortality when tidal volume was dichotomized at 7, 8, 10, or 12 mL/kg. Comparing patients ventilated with tidal volume less than 7 mL/kg and greater than 10 mL/kg or greater than 12 mL/kg and tidal volume less than 8 mL/kg and greater than 10 mL/kg or greater than 12 mL/kg also showed no association between tidal volume and mortality. Limiting the analysis to patients with acute lung injury/acute respiratory distress syndrome did not change these results. Heterogeneity was observed in all pooled analyses. CONCLUSIONS: A relationship between tidal volume and mortality in mechanically ventilated children could not be identified, irrespective of the severity of disease. The significant heterogeneity observed in the pooled analyses necessitates future studies in well-defined patient populations to understand the effects of tidal volume on patient outcome.

Bench test assessment of mainstream capnography during high frequency oscillatory ventilation.

To assess the feasibility, stability and predictability of pCO2 measurement (PETCO2) using a main stream capnograph in a high frequency oscillatory ventilation circuit. A commercially available capnograph was mounted into a high frequency oscillatory ventilator patient circuit, adjustable CO2 flow was introduced into an artificial lung and the output of the CO2 sensor assessed under varying ventilator settings. Influence of oxygen content, pressures, heat and moisture were recorded. A linear relationship between CO2 flow rate and PETCO2 was found. Varying ventilator settings influenced the measurements, but the results for PETCO2 remained within a range of 1.5 mmHg above or under then mean measurement value. Measurements remained stable despite humidification, heat, pressure amplitudes or mean airway pressure changes. From this bench test, we conclude it is feasible to measure PETCO2 using a main stream capnograph during high frequency oscillatory conditions, these measurements were stable during the experiment. Changes in CO2 production or output can be detected. The system may prove to be of clinical value, but further in vivo measurements are warranted.

Argumentation in end-of-life conversations with families in Dutch intensive care units: a qualitative observational study.

PURPOSE: In intensive care units (ICUs), decisions about the continuation or discontinuation of life-sustaining treatment (LST) are made on a daily basis. Professional guidelines recommend an open exchange of standpoints and underlying arguments between doctors and families to arrive at the most appropriate decision. Yet, it is still largely unknown how doctors and families argue in real-life conversations. This study aimed to (1) identify which arguments doctors and families use in support of standpoints to continue or discontinue LST, (2) investigate how doctors and families structure their arguments, and (3) explore how their argumentative practices unfold during conversations. METHOD: A qualitative inductive thematic analysis of 101 audio-recorded conversations between doctors and families. RESULTS: Seventy-one doctors and the families of 36 patients from the neonatal, pediatric, and adult ICU (respectively, N-ICU, P-ICU, and A-ICU) of a large university-based hospital participated. In almost all conversations, doctors were the first to argue and families followed, thereby either countering the doctor's line of argumentation or substantiating it. Arguments put forward by doctors and families fell under one of ten main types. The types of arguments presented by families largely overlapped with those presented by doctors. A real exchange of arguments occurred in a minority of conversations and was generally quite brief in the sense that not all possible arguments were presented and then discussed together. CONCLUSION: This study offers a detailed insight in the argumentation practices of doctors and families, which can help doctors to have a sharper eye for the arguments put forward by doctors and families and to offer room for true deliberation.

Diversity of Parent Emotions and Physician Responses During End-of-Life Conversations.

BACKGROUND AND OBJECTIVES: To provide support to parents of critically ill children, it is important that physicians adequately respond to parents' emotions. In this study, we investigated emotions expressed by parents, physicians' responses to these expressions, and parents' emotions after the physicians' responses in conversations in which crucial decisions regarding the child's life-sustaining treatment had to be made. METHODS: Forty-nine audio-recorded conversations between parents of 12 critically ill children and physicians working in the neonatal and pediatric intensive care units of 3 Dutch university medical centers were coded and analyzed by using a qualitative inductive approach. RESULTS: Forty-six physicians and 22 parents of 12 children participated. In all 49 conversations, parents expressed a broad range of emotions, often intertwining, including anxiety, anger, devotion, grief, relief, hope, and guilt. Both implicit and explicit expressions of anxiety were prevalent. Physicians predominantly responded to parental emotions with cognition-oriented approaches, thereby limiting opportunities for parents. This appeared to intensify parents' expressions of anger and protectiveness, although their anxiety remained under the surface. In response to more tangible emotional expressions, for instance, grief when the child's death was imminent, physicians provided parents helpful support in both affect- and cognition-oriented ways. CONCLUSIONS: Our findings illustrate the diversity of emotions expressed by parents during end-of-life conversations. Moreover, they offer insight into the more and less helpful ways in which physicians may respond to these emotions. More training is needed to help physicians in recognizing parents' emotions, particularly implicit expressions of anxiety, and to choose helpful combinations of responses.

Reflections on pediatric high-frequency oscillatory ventilation from a physiologic perspective.

Mechanical ventilation using low tidal volumes has become universally accepted to prevent ventilator-induced lung injury. High-frequency oscillatory ventilation (HFOV) allows pulmonary gas exchange using very small tidal volume (1-2 mL/kg) with concomitant decreased risk of atelectrauma. However, its use in pediatric critical care varies between only 3% and 30% of all ventilated children. This might be explained by the fact that the beneficial effect of HFOV on patient outcome has not been ascertained. Alternatively, in contrast with present recommendations, one can ask if HFOV has been employed in its most optimal fashion related especially to the indications for and timing of HFOV, as well as to using the best oscillator settings. The first was addressed in one small randomized study showing that early use of HFOV, instead of rescue use, was associated with improved survival. From a physiologic perspective, the oscillator settings could be refined. Lung volume is the main determinant of oxygenation in diffuse alveolar disease, suggesting using an open-lung strategy by recruitment maneuvers, although this is in practice not custom. Using such an approach, the patient can be oscillated on the deflation limb of the pressure-volume (P-V) curve, allowing less pressure required to maintain a certain amount of lung volume. Gas exchange is determined by the frequency and the oscillatory power setting, controlling the magnitude of the membrane displacement. Experimental work as well as preliminary human data have shown that it is possible to achieve the smallest tidal volume with concomitant adequate gas exchange when oscillating at high frequency and high fixed power setting. Future studies are needed to validate these novel approaches and to evaluate their effect on patient outcome.

How doctors manage conflicts with families of critically ill patients during conversations about end-of-life decisions in neonatal, pediatric, and adult intensive care.

PURPOSE: Intensive care is a stressful environment in which team-family conflicts commonly occur. If managed poorly, conflicts can have negative effects on all parties involved. Previous studies mainly investigated these conflicts and their management in a retrospective way. This study aimed to prospectively explore team-family conflicts, including its main topics, complicating factors, doctors' conflict management strategies and the effect of these strategies. METHODS: Conversations between doctors in the neonatal, pediatric, and adult intensive care unit of a large university-based hospital and families of critically ill patients were audio-recorded from the moment doubts arose whether treatment was still in patients' best interest. Transcripts were coded and analyzed using a qualitative deductive approach. RESULTS: Team-family conflicts occurred in 29 out of 101 conversations (29%) concerning 20 out of 36 patients (56%). Conflicts mostly concerned more than one topic. We identified four complicating context- and/or family-related factors: diagnostic and prognostic uncertainty, families' strong negative emotions, limited health literacy, and burden of responsibility. Doctors used four overarching strategies to manage conflicts, namely content-oriented, process-oriented, moral and empathic strategies. Doctors mostly used content-oriented strategies, independent of the intensive care setting. They were able to effectively address conflicts in most conversations. Yet, if they did not acknowledge families' cues indicating the existence of one or more complicating factors, conflicts were likely to linger on during the conversation. CONCLUSION: This study underlines the importance of doctors tailoring their communication strategies to the concrete conflict topic(s) and to the context- and family-related factors which complicate a specific conflict.

How Physicians Discuss Uncertainty With Parents in Intensive Care Units.

BACKGROUND AND OBJECTIVES: Physicians and parents of critically ill neonates and children receiving intensive care have to make decisions on the child's behalf. Throughout the child's illness and treatment trajectory, adequately discussing uncertainties with parents is pivotal because this enhances the quality of the decision-making process and may positively affect the child's and parents' well-being. We investigated how physicians discuss uncertainty with parents and how this discussion evolves over time during the trajectory. METHODS: We asked physicians working in the NICU and PICU of 3 university medical centers to audio record their conversations with parents of critically ill children from the moment doubts arose whether treatment was in the child's best interests. We qualitatively coded and analyzed the anonymized transcripts, thereby using the software tool MAXQDA 2020. RESULTS: Physicians were found to adapt the way they discussed uncertainty with parents to the specific phase of the child's illness and treatment trajectory. When treatment options were still available, physicians primarily focused on uncertainty related to diagnostic procedures, treatment options, and associated risks and effects. Particularly when the child's death was imminent, physicians had less "scientific" guidance to offer. They eliminated most uncertainty and primarily addressed practical uncertainties regarding the child's dying process to offer parents guidance. CONCLUSIONS: Our insights may increase physicians' awareness and enhance their skills in discussing uncertainties with parents tailored to the phase of the child's illness and treatment trajectory and to parental needs in each specific phase.

Transfusion of leukocyte-depleted red blood cells is not a risk factor for nosocomial infections in critically ill children.

OBJECTIVES: Transfusion of red blood cells is increasingly linked with adverse outcomes in critically ill children. We tested the hypothesis that leukocyte-depleted red blood cell transfusions were independently associated with increased development of bloodstream infections, ventilator-associated pneumonias, or urinary tract infections. DESIGN: Historical, descriptive cohort study. SETTING: Single-center, mixed medical-surgical, closed nine-bed pediatric intensive care unit of a tertiary university hospital. PATIENTS: All children <18 yrs of age consecutively admitted to the pediatric intensive care unit during a 3-yr period (January 1, 2005, to December 31, 2007). INTERVENTIONS: None. RESULTS: One thousand one hundred twenty-three patients were admitted, of whom 503 (44.8%) were admitted for >48 hrs. Sixty-five (12.9%) had a nosocomial infection (incidence 19.3 per 1,000 pediatric intensive care unit admissions per year). Patients with a nosocomial infection were significantly more often male (72.3% vs. 27.7%, p = .033), had a higher Pediatric Risk of Mortality II score (median 19.1 [range, 6-44] vs. 18.0 [range, 2-39], p = .023), were more often ventilated (95.4% vs. 80.1%, p = .003), and received more often red blood cell transfusions (55.4% vs. 40.2%, p = .021). Multivariate logistic regression analysis showed that male gender (odds ratio, 2.07; 95% confidence interval, 1.14-3.76), presence of an indwelling central venous catheter (odds ratio, 2.41; 95% confidence interval, 1.29-4.48), and simultaneous use of more than one type of antimicrobial drug were independently associated with the development of nosocomial infections. Red blood cell transfusion was discarded as a predictor. CONCLUSIONS: Transfusion of leukocyte-depleted red blood cells was not independently associated with the development of nosocomial infections in a heterogeneous group of critically ill children.

Differences in the perceptions of parents and healthcare professionals on pediatric intensive care practices.

OBJECTIVE: To explore similarities and differences in perceptions on pediatric intensive care practices between parents and staff by using data from two studies. DESIGN: A two-round Delphi method among nurses and physicians followed by an empiric survey among parents. SETTINGS: Pediatric intensive care units at eight university medical centers. SUBJECTS: Parents whose child has been admitted to a pediatric intensive care unit, nurses, and physicians. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Outcome measures were 74 satisfaction-with-care items divided into five domains: 1) information; 2) care and cure; 3) organization; 4) parental participation; and 5) professional attitude. The Delphi study was completed by 218 nurses and 46 physicians and the survey by 559 of 1042 (54%) parents. Parents rated 31 items more important than the professionals based on the standardized mean difference (Cohen's d, 0.21-1.18, p < .003). Ten of these were related to information provision. Information on the effects of medication had the largest effect size (Cohen's d 1.18, p = .001). Correct medication administration by professionals was also rated significantly more important by parents (Cohen's d 0.64, p = .001). The professionals rated 12 items more important than the parents (Cohen's d -0.23 to -0.73, p < .005), including three about multicultural care. Significant differences remained on two of the three multicultural care items when the Dutch (n = 483) and non-Dutch parents (n = 76) were separately compared with professionals. On the domain level, parents rated the domains information and parental participation more important than the professionals (Cohen's d 0.36 and 0.26, p = .001). CONCLUSIONS: Compared with the parents' perceptions, nurses and physicians undervalued a substantial number of pediatric intensive care unit care items. This finding may reflect a gap in the understanding of parental experiences as well as incongruity in recognizing the needs of parents.

[A girl with dyspnea and an enlarged liver]. / Een meisje met dyspneu en een vergrote lever.

BACKGROUND: During winter, the influenza and Respiratory Syncytial Virus season, children are often seen in the emergency department with fever and respiratory symptoms. CASE DESCRIPTION: We describe the case of a 2-year-old girl with fever, dyspnea and signs of heart failure during physical examination. Echocardiogram showed a large amount of pericardial effusion with signs of cardiac tamponade. Pericardiocentesis showed 200 ml purulent liquid. Surgical drainage was performed. However pericardial effusion recurred. Because constrictive pericarditis was feared, a pericardiectomy was performed after which the patient recovered. Cultures showed Haemophilus influenzae type b and the patient was treated with amoxicillin for 4 weeks in total. CONCLUSION: Fever and dyspnea may also be caused by a problem outside the respiratory system. With physical examination a cardiac cause, such as pericarditis, can be detected. An ECG is easily obtained and can help in the differential diagnosis. An echocardiogram can confirm the diagnosis.

Demand flow facilitates spontaneous breathing during high-frequency oscillatory ventilation in a pig model.

OBJECTIVE: Maintenance breathing is advocated in mechanical ventilation, which is difficult for the high-frequency oscillatory (HFO) ventilation. To facilitate spontaneous breathing during HFO ventilation, a demand flow system (DFS) was designed. The aim of the present study was to evaluate the system. DESIGN: Animal experiment. SETTING: : University animal laboratory. SUBJECTS: Eight pigs (47-64 kg). INTERVENTIONS: Lung injury was induced by lung lavage with normal saline. After spontaneous breathing was restored HFO ventilation was applied, in runs of 30 minutes, with continuous fresh gas flow (CF) or the DFS operated in two different setups. Pressure to regulate the DFS was sampled directly at the Y-piece of the ventilator circuit (DFS) or between the endotracheal tube and measurement equipment at the proximal end of the endotracheal tube. In the end, animals were paralyzed. Breathing pattern, work of breathing, and gas exchange were evaluated. MEASUREMENTS AND MAIN RESULTS: HFO ventilation with demand flow decreased breathing frequency and increased tidal volume compared with CF. Comparing HFO modes CF, DFS, and DFSPROX, total pressure-time product (PTP) was 66 cm H2O x sec x min (interquartile range 59-74), 64 cm H2O x sec x min (50-72), and 51 cm H2O x sec x min (41-63). Ventilator PTP was 36 cm H2O x sec x min (32-42), 8.6 cm H2O x sec x min (7.4-10), and 1 cm H2O x sec x min (-1.0 to 2.8). Oxygenation, evaluated by Pao2, was preserved when spontaneous breathing was maintained and deteriorated when pigs were paralyzed. Ventilation, evaluated by Paco2, improved with demand flow. Paco2 increased when using continuous flow and during muscular paralysis. CONCLUSIONS: In moderately lung-injured anesthetized pigs during HFO ventilation, demand flow facilitated spontaneous breathing and augmented gas exchange. Demand flow decreased total breathing effort as quantified by PTP. Imposed work caused by the HFO ventilator appeared totally reduced by demand flow.

Heliox reduces respiratory system resistance in respiratory syncytial virus induced respiratory failure.

INTRODUCTION: Respiratory syncytial virus (RSV) lower respiratory tract disease is characterised by narrowing of the airways resulting in increased airway resistance, air-trapping and respiratory acidosis. These problems might be overcome using helium-oxygen gas mixture. However, the effect of mechanical ventilation with heliox in these patients is unclear. The objective of this prospective cross-over study was to determine the effects of mechanical ventilation with heliox 60/40 versus conventional gas on respiratory system resistance, air-trapping and CO2 removal. METHODS: Mechanically ventilated, sedated and paralyzed infants with proven RSV were enrolled within 24 hours after paediatric intensive care unit (PICU)admission. At T = 0, respiratory system mechanics including respiratory system compliance and resistance, and peak expiratory flow rate were measured with the AVEA ventilator. The measurements were repeated at each interval (after 30 minutes of ventilation with heliox, after 30 minutes of ventilation with nitrox and again after 30 minutes of ventilation with heliox). Indices of gas exchange (ventilation and oxygenation index) were calculated at each interval. Air-trapping (defined by relative change in end-expiratory lung volume) was determined by electrical impedance tomography (EIT) at each interval. RESULTS: Thirteen infants were enrolled. In nine, EIT measurements were performed. Mechanical ventilation with heliox significantly decreased respiratory system resistance. This was not accompanied by an improved CO2 elimination, decreased peak expiratory flow rate or decreased end-expiratory lung volume. Importantly, oxygenation remained unaltered throughout the experimental protocol. CONCLUSIONS: Respiratory system resistance is significantly decreased by mechanical ventilation with heliox (ISCRTN98152468).

Transient electrocardiographic abnormalities following blunt chest trauma in a child.

Blunt cardiac injury may occur in patients after suffering nonpenetrating trauma of the chest. It encompasses a wide spectrum of cardiac injury with varied severity and clinical presentation. Electrocardiographic abnormalities are frequently encountered. This article presents a case of a child who presented with complete right bundle branch block on the initial ECG at the emergency department. She suffered blunt chest trauma during a horseback riding accident. She was admitted for cardiac monitoring. The electrocardiographic abnormalities resolved within 12 hours. No signs of myocardial injury were found on repeat serum troponin measurement and echocardiography. The natural history of ECG abnormalities in the pediatric age group following blunt chest trauma is limited. Although a complete right bundle branch block may be transient in adult patients, this has not been previously reported in a children. Significant ECG abnormalities can be encountered in children following blunt chest trauma. Although a complete RBBB can be associated with severe injury to the RV, it can also occur with minor injury.

Incidence and risk factors of prolonged mechanical ventilation in neuromuscular scoliosis surgery.

Patients with neuromuscular scoliosis (NMS) are frequently considered at high risk for postoperative complications based on their underlying disease and comorbidities. Postoperative complications include prolonged mechanical ventilation (MV), defined longer than 72 h, at the paediatric intensive care unit. The objectives of this retrospective study were to assess the incidence of prolonged MV in patients with NMS following scoliosis surgery and to identify predictive risk factors. A total of 46 consecutive patients underwent surgical spinal fusion and instrumentation for progressive NMS. Prolonged MV was required in seven of 46 patients (15%). The only risk factor for prolonged MV was a decreased preoperative pulmonary function. Forced expired volume in 1 s and vital capacity were significantly decreased in patients with MV >72 h compared with patients with MV <72 h. Routine preoperative pulmonary function testing may reveal important information with regard to restrictive lung disease in the preoperative assessment of patients with NMS and predict the early postoperative clinical course.