Conservative versus invasive treatment of primary spontaneous pneumothorax: a retrospective cohort study

Methods of measurement for pneumothorax in pediatric patients: a systematic review

Accurate measurement of pneumothorax (PTX) size is necessary to guide clinical decision making; however, there is no consensus as to which method should be used in pediatric patients. This systematic review seeks to identify and evaluate the methods used to measure PTX size with CXR in pediatric patients. A systematic review of the literature through 2021 following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) was conducted using the following databases: Ovid/MEDLINE, Scopus, Cochrane Database of Controlled Trials, Cochrane Database of Systematic Reviews, and Google Scholar. Original research articles that included pediatric patients (< 18 years old) and outlined the PTX measurement method were included. 45 studies were identified and grouped by method (Kircher and Swartzel, Rhea, Light, Collins, Other) and societal guideline used. The most used method was Collins (n = 16; 35.6%). Only four (8.9%) studies compared validated methods. All found the Collins method to be accurate. Seven (15.6%) studies used a standard classification guideline and 3 (6.7%) compared guidelines and found significant disagreement between them. Pediatric-specific measurement guidelines for PTX are needed to establish consistency and uniformity in both research and clinical practice. Until there is a better method, the Collins method is preferred.

Observation, Aspiration, or Tube Thoracostomy for Primary Spontaneous Pneumothorax: A Systematic Review, Meta-Analysis, and Cost-Utility Analysis

BACKGROUND

Primary spontaneous pneumothorax (PSP) has several commonly used management strategies: observation, aspiration, and chest tube placement. Economic modelling of pooled data comparing techniques has not been performed.

RESEARCH QUESTION

Based on studies from the past 20 years, which approach to management of PSP delivers the highest utility?

STUDY DESIGN AND METHODS

A systematic review of PSP management strategies (observation, aspiration, or chest tube placement) included in the Medline and EMBASE databases from January 1, 2000, through April 10, 2020, was conducted. Text screening, bias assessment, and data extraction were performed by two authors (G. E. and C. A. P.). Inclusion and exclusion criteria were defined a priori. The primary outcome was PSP resolution after the initial intervention. Secondary outcomes were PSP recurrence, length of stay, rate of surgical management, and complications. The meta-analysis compared treatment arms; dichotomous outcomes were reported as relative risk (RRs) and continuous outcomes were reported as mean differences. A cost-utility analysis within the Canadian health care system context with deterministic and probabilistic sensitivity analyses was performed.

RESULTS

Five thousand one hundred seventy-nine articles were identified; after screening, 22 articles were included. Most trials showed a high risk of bias, but randomized trials showed a lower risk. Compared with chest tube placement, observation (mean difference, 5.17; 95% CI, 3.75-6.59; P < .01; I2 = 62%) and aspiration (mean difference, 2.72; 95% CI, 2.39-3.04; P < .01; I2 = 0%) showed a shorter length of stay. Compared with observation, chest tube placement (RR, 0.81; 95% CI, 0.71-0.91; P < .01; I2 = 62%) and aspiration (RR, 0.73; 95% CI, 0.61-0.88; P < .01; I2 = 67%) showed higher resolution without additional intervention. Two-year recurrence rates did not differ between management strategies. Observation showed the best utility (0.82) and lowest cost; observation was the optimal strategy in 98.2% of Monte Carlo simulations.

INTERPRETATION

Observation is the dominant choice compared with aspiration and chest tube placement for PSP. It should be considered as the first-line therapy in appropriately selected patients.

Utilization and Outcomes of Observation for Spontaneous Pneumothorax at an Integrated Health System

INTRODUCTION

Though limited, recent evidence supports observation rather than intervention for spontaneous pneumothorax management. We sought to compare the utilization and outcomes between observation and intervention for patients with primary and secondary spontaneous pneumothoraces.

METHODS

A retrospective cohort study of all adults presenting to Kaiser Permanente Northern California emergency rooms with spontaneous pneumothorax from 2016 to 2020 was performed. Those with prior pneumothoraces, tension physiology, bilateral pneumothoraces, effusions, and prior thoracic procedures or surgery on the affected side were excluded. Groups included observation versus intervention. Baseline clinicodemographic variables and outcomes were compared. Treatment was considered successful if further interventions were not required for pneumothorax resolution. Wilcoxon rank-sum tests, chi-square tests, Fischer exact tests, and multivariable logistic regression models were performed.

RESULTS

Of the 386 patients with primary spontaneous pneumothorax, age, race/ethnicity, body mass index, smoking status, and the Charlson comorbidity index were not different between treatment groups. Of 86 patients with secondary spontaneous pneumothorax, age, gender, and smoking status were not different between treatment groups. Among patients with primary pneumothoraces, 83 underwent observation while 303 underwent intervention. The success rate was 92.8% for observation and 60.4% for intervention (P < 0.0001). Among patients with secondary pneumothoraces, 15 underwent observation while 71 underwent intervention, with a successful rate of 73.3% for observation and 32.4% for intervention (P = 0.003).

CONCLUSIONS

Given the high success rates for observation of both small and moderate primary and secondary pneumothoraces, observation should be considered for clinically stable patients. Observation may be the superior choice for decreasing morbidity and healthcare costs.

Conservative management of traumatic pneumothoraces: A retrospective cohort study

OBJECTIVE

Traumatic pneumothoraces (T-PTXs) are traditionally managed with an intercostal catheter (ICC), despite little evidence for this. Success with conservative management of primary spontaneous PTX has been demonstrated, and our ED has adopted a conservative approach where safe for all PTX.

METHODS

We reviewed all T-PTXs at our institution over a 7-year period to assess outcomes of those conservatively managed and compare with those who received an ICC. A total of 144 cases were identified, 65 managed conservatively and 79 invasively. Each was individually reviewed and variables including demographics, aetiology, smoking/lung disease history, T-PTX size (apical interpleural distance and hemithorax percentage), length of stay, Revised Trauma Score, Injury Severity Score and delayed intervention/complications were recorded. Chi-squared, Z-score, Mann-Whitney U and t-tests were used for analysis.

RESULTS

The mean apical interpleural distance was 26.8 mm (95% confidence interval [CI] 22.1-29.7 mm) in the conservative group and 49.1 mm (95% CI 41.2-57.0 mm) in the ICC group (P < 0.05 for difference between groups). Mean T-PTX percentage 25.9% (95% CI 22.1-29.7%) in the conservative group versus 45.9% (95% CI 39.7-50.5%) in the ICC group (P < 0.05 for difference between two groups) and mean Revised Trauma Score 7.4 (conservative) versus 6.8 (invasive) (P < 0.05). No conservatively managed patient required a delayed intervention for their T-PTX, and 2 of 79 (3%) patients in the ICC group had a complication (one infection, one haemothorax).

CONCLUSION

Our data support conservative management of selected T-PTXs and shows a need for a prospective randomised trial to further examine this intervention.

An evidence-based review of primary spontaneous pneumothorax in the adolescent population

Primary spontaneous pneumothorax (PSP) is a relatively common problem in emergency medicine. The incidence of PSP peaks in adolescence and is most common in tall, thin males. Recent advances in the care of patients with PSP have called into question traditional approaches to management. This clinical review highlights the changing management strategies for PSP and concludes with a proposed evidence-based pathway to guide the care of adolescents with PSP.

Conservative versus invasive management of secondary spontaneous pneumothorax: a retrospective cohort study

Aim

Hospitalization, often with intervention, is the recommended management algorithm by multiple international respiratory societies for management of a secondary spontaneous pneumothorax (SSP). Over recent years we adopted a conservative approach to SSPs. We undertook a retrospective cohort study of SSP to establish the safety profile of a conservative approach for these previously unstudied patients.

Methods

We reviewed all cases of SSP presenting to our institution from 2012 to 2019 using the 2010 British Thoracic Society definition of an SSP. Age, gender, smoking status, underlying lung disease, pneumothorax size estimate (using the Collins method), nature of intervention, inpatient duration, and any additional complications were recorded. The χ²‐test and Mann–Whitney U‐test were used for comparison of categorical variables and categorical/continuous variables, respectively.

Results

Eighty‐two cases were included in the final analysis. Of them, 64 had an interpleural distance at the hilum of 1cm or greater, meeting British Thoracic Society criteria for a pleural intervention. Of these 64 patients, 25 (39%) were managed conservatively. No patient managed conservatively required a subsequent intervention. When stratified for conservative or invasive management, there was no significant difference in age, gender, smoking status, or presence of underlying lung disease between the groups. There was a significant difference in size of the pneumothorax with conservative management having smaller pneumothoraces (37% versus 54%, P < 0.001) and a shorter inpatient stay (conservative, 7.9 days; intercostal catheter, 9 days; P = 0.004).

Conclusion

We have demonstrated success with conservative management of SSPs where a significant proportion of them met accepted criteria for a pleural intervention.

New insights into spontaneous pneumothorax: A review

A spontaneous pneumothorax is a pneumothorax that does not arise from trauma or an iatrogenic cause. Although the traditional classification of either primary or secondary spontaneous pneumothorax based on the absence or presence of overt underlying lung disease is still widely used, it is now well recognised that primary spontaneous pneumothorax is associated with underlying pleuropulmonary disease. Current evidence indicates that computed tomography screening for underlying disease should be considered in patients who present with spontaneous pneumothorax. Recent evidence suggests that conservative management has similar recurrence rates, less complications and shorter hospital stay compared with invasive interventions, even in large primary spontaneous pneumothoraces of >50%. A more conservative approach which is based on clinical assessment rather than pneumothorax size can thus be followed during the acute management in selected stable patients. The purpose of this review is to revisit the aetiology of spontaneous pneumothorax, identify which patients should be investigated for secondary causes and to give an overview of the management strategies at initial presentation as well as secondary prevention.

Chest Tube Drainage Versus Conservative Management as the Initial Treatment of Primary Spontaneous Pneumothorax: A Systematic Review and Meta-Analysis

Objectives: This systematic review and meta-analysis aimed to compare chest tube drainage and conservative management as the initial treatment of primary spontaneous pneumothorax (PSP). Methods: Studies including PSP patients who received tube drainage or conservative management as the initial treatment were searched in OVID-MEDLINE and Embase through 14 February 2020. The primary outcome was the relative risk (RR) of PSP recurrence, and secondary outcomes were RRs of PSP resolution and adverse events during treatment. A random-effect model using the Mantel–Haenszel method was used to pool RRs. Subgroup and meta-regression analyses were performed to investigate significant predictors of PSP recurrence. Results: In total, 11,922 PSP cases from eight studies were analysed, of which 6344 were treated with tube drainage and 5578 were treated with conservative management. The pooled RR of PSP recurrence for conservative management against tube drainage was 0.98 (95% confidence interval [CI], 0.75–1.28; p = 0.894). Subgroup and meta-regression analyses revealed that study design (p = 0.816), allocation of the PSP amount in each management group (p = 0.191), and assessment time for recurrence had no significant impact on PSP recurrence (p = 0.816). There was no publication bias (p = 0.475). The risk of adverse events of conservative management was significantly lower than that of tube drainage (pooled RR, 0.22; 95% CI, 0.08–1.15; p = 0.003). However, no difference was found between the two groups in terms of PSP resolution (pooled RR, 1.01; 95% CI, 0.9–1.15; p = 0.814). Conclusions: As the initial treatment for PSP, conservative management is comparable to chest tube drainage in terms of PSP recurrence and resolution after treatment, with fewer adverse events during treatment.

Comparison of efficiency and safety of conservative versus interventional management for primary spontaneous pneumothorax: A meta-analysis

BACKGROUND

There is growing opinion that primary spontaneous pneumothorax (PSP) patients without hemodynamic compromise could be safely and successfully managed with observation alone. The aims of this meta-analysis were to estimate the safety and effectiveness of conservative treatment compared with that of interventional management as the initial treatment option for patients with PSP.

METHODS

The PubMed, Embase and Cochrane library databases were systematically searched for randomized controlled trials (RCTs) and cohort studies (prospective or retrospective) until April 25, 2020, that compared conservative treatment and interventional treatment as the initial treatment for patients with PSP. The primary outcomes were success rates and recurrence rates. The secondary outcome was complication rates. Data extraction and quality assessment from eligible studies were independently conducted by two reviewers.

RESULTS

8 trials with a total of 1342 patients were identified. The success rates of conservative management were similar with interventional treatment, with a risk ratio 1.05 (95% confidence interval 0.94 to 1.17, I2 = 69.1%). There was no significant difference of recurrence rates between these two type managements. (RR, 1.43, 95% confidence interval 0.45 to 4.55, I2 = 86.7%). Complication rates were lower in conservative treatment group (13 of 215 [6.05%]) than in interventional treatment group (57 of 212, [26.89%]), although the difference did not reach statistical significance (RR, 0.15, 95% CI, 0.02 to 1.13, I2 = 56.7%).

CONCLUSIONS

Results of the meta-analysis suggest that conservative treatment offers a safe and effective alternative as compared with interventional management as the initial treatment approach for patients with PSP. However, more randomized clinical trials are need to provide more strong evidence to confirm our results.

Study protocol for a randomised controlled trial of invasive versus conservative management of primary spontaneous pneumothorax

INTRODUCTION

Current management of primary spontaneous pneumothorax (PSP) is variable, with little evidence from randomised controlled trials to guide treatment. Guidelines emphasise intervention in many patients, which involves chest drain insertion, hospital admission and occasionally surgery. However, there is evidence that conservative management may be effective and safe, and it may also reduce the risk of recurrence. Significant questions remain regarding the optimal initial approach to the management of PSP.

METHODS AND ANALYSIS

This multicentre, prospective, randomised, open label, parallel group, non-inferiority study will randomise 342 participants with a first large PSP to conservative or interventional management. To maintain allocation concealment, randomisation will be performed in real time by computer and stratified by study site. Conservative management will involve a period of observation prior to discharge, with intervention for worsening symptoms or physiological instability. Interventional treatment will involve insertion of a small bore drain. If drainage continues after 1 hour, the patient will be admitted. If drainage stops, the drain will be clamped for 4 hours. The patient will be discharged if the lung remains inflated. Otherwise, the patient will be admitted. The primary end point is the proportion of participants with complete lung re-expansion by 8 weeks. Secondary end points are as follows: days in hospital, persistent air leak, predefined complications and adverse events, time to resolution of symptoms, and pneumothorax recurrence during a follow-up period of at least 1 year. The study has 95% power to detect an absolute non-inferiority margin of 9%, assuming 99% successful expansion at 8 weeks in the invasive treatment arm. The primary analysis will be by intention to treat.

ETHICS AND DISSEMINATION

Local ethics approval has been obtained for all sites. Study findings will be disseminated by publication in a high-impact international journal and presentation at major international Emergency Medicine and Respiratory meetings.

TRIAL REGISTRATION NUMBER

ACTRN12611000184976; Pre-results.