Safety and feasibility of in-hospital autonomous transportation using a driverless mobility for patients with musculoskeletal disorders: preliminary clinical study to achieve mobility as a service in medical care.

BACKGROUND: Recent advancements in and the proliferation of autonomous mobility technology, such as intelligent wheelchairs, have made it possible to provide mobility services for patients with reduced mobility due to musculoskeletal disorders. In the present study, we conducted a preliminary clinical study to assess the safety and feasibility of in-hospital autonomous transportation using a driverless mobility (wheelchair) for patients with musculoskeletal disorders. METHODS: From January to February 2022, 51 patients with musculoskeletal disorders exhibiting gait disturbance who presented to our institution were included in the present study. Driverless mobility rides were conducted over a straight-line distance of 100 m from the orthopaedic outpatient reception to the payment counter after the outpatient consultation. We assessed the quality of life using an EQ-5D-5 L index and pain using a VAS score before riding the mobility to investigate the patient's condition. After the ride, a questionnaire survey was conducted to assess patient satisfaction on a 5-point scale. In addition, adverse events during the mobility ride were investigated. RESULTS: Overall satisfaction levels showed that 44 out of 51 (86%) patients rated the level as 3 or higher. There were no significant differences in the level of satisfaction based on the cause of disorders or EQ-5D-5 L Index. Among 19 patients who rated the level of satisfaction as 2-3, the ratio of postoperative patients and those with pain tended to be higher (p < 0.05). While 26 of 51 (51%) patients reported moments of feeling unsafe during the mobility ride, no actual adverse events, such as collisions, were observed. CONCLUSIONS: An in-hospital autonomous transportation service using a driverless mobility for patients with musculoskeletal disorders demonstrated high satisfaction levels and was safe with no severe adverse events observed. The expansion of autonomous mobility deployment is expected to achieve mobility as a service in medical care.

Aeromedical Transport for Critically Ill Patients.

Aeromedical transport (AMT) is an integral part of healthcare systems worldwide. In this article, the personnel and equipment required, associated safety considerations, and evidence supporting the use of AMT is reviewed, with an emphasis on helicopter emergency medical services (HEMS). Indications for HEMS as guideded by the Air Medical Prehospital Triage Score are presented. Lastly, physiologic considerations, which are important to both AMT crews and receiving clinicians, are reviewed.

Fate of Pediatric Transport Medicine Abstracts 2011 to 2020: What Predicts Publication Success?

OBJECTIVE: Pediatric-neonatal transport research projects are presented at the American Academy of Pediatrics (AAP) Section on Transport Medicine (SOTM) scientific abstract program annually. Journal publication increases the impact of these projects. Our objectives were to determine the publication rate of transport abstracts and to identify factors predictive of publication success. METHODS: We reviewed all AAP SOTM abstracts accepted for presentation from 2011 to 2020 and assessed presentation format (oral/platform vs. poster), authors' professional degree (physician vs. nonphysician), and first author's trainee status. We searched PubMed, Ovid, and ResearchGate for publications by abstract title and authors and then compared published versus unpublished abstracts. Categorical variables were expressed as proportions and compared using the chi-square test or the Fisher exact test, whereas continuous variables were summarized using medians and interquartile ranges (IQRs) and compared using the Student t-test or the Kruskal-Wallis test as appropriate. A linear probability model was performed. RESULTS: Of 194 presented abstracts, 67 (34.5%) were published. The publication rate was significantly higher for oral/platform versus poster abstracts (P < .01), if the abstract was an oral/platform (probability increase by 19.5%, P < .01), and if the first author was a trainee (probability increase by 25.6%, p < 0.05). The constant was estimated as 24.9% probability of publication. Hence, if the first author was a physician, a trainee, and had an oral/platform presentation, there was an 85.8% chance of being published. The median (IQR) time to publication was 2 years (IQR: 2-4 years), with articles published the longest having the most citations. Articles were published in 27 different journals, with nearly half (33/67, 49.3%) being published in 3 journals. CONCLUSION: AAP SOTM abstracts have a 34.5% publication rate over the past 10 years, which is consistent with other medical specialties. Oral abstracts, physician first authors, and trainee first authors had a significantly higher success rate. Special emphasis should be placed nationally on supporting nonphysician transport professionals to publish their work.

Using NEMSIS to report annual air medical transport statistics.

OBJECTIVE: The objective of this study was to use the National Emergency Medical Services Information System (NEMSIS) dataset to generate national air medical transport statistics. METHODS: Retrospective review of the 2021 NEMSIS dataset to identify all air medical transfers, both fixed- and rotor-wing. Transfers where then subcategorized into interfacility and scene responses. Frequencies for each category were generated and reported. RESULTS: A total of 317,267 air medical transfers were completed in 2021. These included 19,421 (6 %) with missing incident location code data. Of the 297,706 transfers with valid location codes, 208,689 (70%) were interfacility transfers, and 89,016 (30%) were scene responses. CONCLUSION: These preliminary results are consistent with other national estimates and achieve representation of all states and territories. Future work will include longitudinal analysis of NEMSIS datasets and direct survey of transport programs to establish long-term reliability.

A Description of Medications and Intravenous Fluids Used During Neonatal Transport by a Regional Pediatric Critical Care Team.

OBJECTIVE: This study aimed to describe the type and frequency of enteral and parenteral fluids and medications used during the transport of neonates by a regional pediatric critical care transport team. METHODS: We performed a retrospective analysis of neonates transported by a regional neonatal transport team affiliated with a level IV neonatal intensive care unit within a large care network between 2020 and 2021. Demographic and clinical data were collected from the electronic medical record. Standard frequency tabulation and summary statistics were used to report demographics, transport characteristics, and fluid and medication use; results were then stratified by preterm (37 weeks) and term births. RESULTS: In the 628 included transports, more term than preterm infants received at least 1 fluid or medication (53% vs. 43%, respectively). The most commonly administered medications were antibiotics (ampicillin and gentamicin), prostaglandin, and opiates (morphine sulfate and fentanyl). In addition, term infants received more analgesic medications, antimicrobials, and prostaglandin, whereas preterm infants received total parenteral nutrition more often. There were over 38 different medications provided on the transports studied. CONCLUSION: This study of a single transport team revealed that a wide variety of medications and fluids were used in the transport of neonates, with term infants receiving more medications than preterm infants. These data could be used by transport teams in making or updating their standardized medication lists or in creating simulations.

Pediatric Critical Care Referrals for Tertiary Inpatient and Transport Services in Canada's Maritime Provinces: A Retrospective Cohort Study.

OBJECTIVE: Accurate triage of children referred for tertiary pediatric critical care services is crucial to ensure optimal disposition and resource conservation. We aimed to explore the characteristics and level of care needs of children referred to tertiary pediatric critical care inpatient and transport services and the characteristics of referring physicians and hospitals to which these children present. METHODS: We conducted a 1-year retrospective cohort study of children (< 16 years) with documented referral to pediatric critical care and specialized transport services at a tertiary pediatric hospital from regional (24/7 pediatrician on-call coverage) and community (no pediatric specialty services) hospitals in Canada's Maritime provinces. RESULTS: We identified 205 documented referrals resulting in 183 (89%) transfers; 97 (53%) were admitted to the pediatric intensive care unit (PICU). Of 150 children transferred from centers with 24/7 pediatric specialist coverage, 45 (30%) were admitted to the tertiary hospital pediatric medical unit with no subsequent admission to the PICU. Of 20 children transferred from community hospitals and admitted to the tertiary hospital general pediatric medical unit, 9 (45%) bypassed proximate regional hospitals with specialist pediatric care capacity. The specialized pediatric critical care transport team performed 151 (83%) of 183 interfacility transfers; 83 (55%) were admitted to the PICU. CONCLUSION: One third of the children accepted for interfacility transfer after pediatric critical care referral were triaged to a similar level of care as could be provided at the sending or nearest regional hospital. Improved utilization of pediatric expertise in regional hospitals may reduce unnecessary pediatric transports and conserve valuable health care resources.

The way back home: The invisible burden of the emergency healthcare services.

Ambulance services around the world vary according to regional, cultural and socioeconomic conditions. Many countries apply different health policies locally. In Turkey, transportation from hospital to home has started to form an important part of ambulance services in recent years. The increase in the number of patients whose treatment has been completed and waiting to be referred may hinder the work of the emergency services. The aim of this study was to examine the costs, indications, and impact on workload of patients sent home by ambulance. Patients were divided into two groups according to the reasons for referral. The distance to home, transport time and cost were calculated according to the reasons for transport. Patients who were transferred to other clinics or hospitals by ambulance were excluded from the study. The findings showed that the hospital-to-home transfer rate during the study period was 11.4%. Although 9.7% of all cases transferred from our hospital to home were due to social indications, these cases accounted for 16.26% of the total costs. These results suggest that providing home transport services to selected patient groups for medical reasons should be seen as part of the treatment. However, the indications for home transport should not be exceeded and an additional burden should not be placed on the fragile health service.

Characteristics of consecutive versus non-consecutive frequent emergency medical services transport to a single emergency department.

OBJECTIVE: This study was to examine characteristics concerning frequent users of emergency medical services (EMS) transport by comparing patients who used EMS transport frequently for one year and those who used EMS transport for more than two years consecutively. METHODS: A retrospective review for frequent use of EMS transport was conducted. The patients from the fire stations that transported more than 70% of all EMS transport to the study hospital emergency department (ED) were included. The study subjects were divided into consecutive group (frequent EMS transport for ≥ two years consecutively) and non-consecutive group (frequent EMS transport for only one year). Characteristics of patients who were frequent users of EMS transport and those of all cases with EMS transport were examined. RESULTS: Of the total 205 patients and 1204 cases of frequent EMS transport, 85 (42%) patients and 755 (63%) cases were in the consecutive group. Patients in the consecutive group were more likely to have risky alcohol use, unemployed state, and medical aid type of payment for ED treatment than those in the non-consecutive group. More patients had previous experience of EMS transport to the study hospital ED in the consecutive group and the number of cases with alcohol ingestion was higher in the consecutive group. Elapsed time from EMS call to ED arrival was longer for the consecutive group. CONCLUSION: Risky alcohol use, unemployed state, and previous experience of EMS transport were associated with consecutive and frequent use of EMS transport in frequent users of EMS transport.

Survival After Intra-Arrest Transport vs On-Scene Cardiopulmonary Resuscitation in Children.

Importance: For pediatric out-of-hospital cardiac arrest (OHCA), emergency medical services (EMS) may elect to transport to the hospital during active cardiopulmonary resuscitation (CPR) (ie, intra-arrest transport) or to continue on-scene CPR for the entirety of the resuscitative effort. The comparative effectiveness of these strategies is unclear. Objective: To evaluate the association between intra-arrest transport compared with continued on-scene CPR and survival after pediatric OHCA, and to determine whether this association differs based on the timing of intra-arrest transport. Design, Setting, and Participants: This cohort study included pediatric patients aged younger than 18 years with EMS-treated OHCA between December 1, 2005 and June 30, 2015. Data were collected from the Resuscitation Outcomes Consortium Epidemiologic Registry, a prospective 10-site OHCA registry in the US and Canada. Data analysis was performed from May 2022 to February 2024. Exposures: Intra-arrest transport, defined as an initiation of transport prior to the return of spontaneous circulation, and the interval between EMS arrival and intra-arrest transport. Main Outcomes and Measures: The primary outcome was survival to hospital discharge. Patients who underwent intra-arrest transport at any given minute after EMS arrival were compared with patients who were at risk of undergoing intra-arrest transport within the same minute using time-dependent propensity scores calculated from patient demographics, arrest characteristics, and EMS interventions. We examined subgroups based on age (<1 year vs ≥1 year). Results: Of 2854 eligible pediatric patients (median [IQR] age, 1 [0-9] years); 1691 males [59.3%]) who experienced OHCA between December 2005 and June 2015, 1892 children (66.3%) were treated with intra-arrest transport and 962 children (33.7%) received continued on-scene CPR. The median (IQR) time between EMS arrival and intra-arrest transport was 15 (9-22) minutes. In the propensity score-matched cohort (3680 matched cases), there was no significant difference in survival to hospital discharge between the intra-arrest transport group and the continued on-scene CPR group (87 of 1840 patients [4.7%] vs 95 of 1840 patients [5.2%]; risk ratio [RR], 0.81 [95% CI, 0.59-1.10]). Survival to hospital discharge was not modified by the timing of intra-arrest transport (P value for the interaction between intra-arrest transport and time to matching = .10). Among patients aged younger than 1 year, intra-arrest transport was associated with lower survival to hospital discharge (RR, 0.52; 95% CI, 0.33-0.83) but there was no association for children aged 1 year or older (RR, 1.22; 95% CI, 0.77-1.93). Conclusions and Relevance: In this cohort study of a North American OHCA registry, intra-arrest transport compared with continued on-scene CPR was not associated with survival to hospital discharge among children with OHCA. However, intra-arrest transport was associated with a lower likelihood of survival to hospital discharge among children aged younger than 1 year.

Real emotional experience of family members of patients transported within hospital in neurosurgical intensive care unit: A descriptive qualitative study.

AIM: To understand the real experience of family members of patients in neurosurgical intensive care unit (NICU) during intra-hospital transport (IHT), explore their inner needs and provide effective intervention measures for the construction of standardized IHT plan. DESIGN: A descriptive qualitative study. METHODS: For the purposes of this study, 10 family members of IHT patients were included using a purposive sampling method. Semi-structured in-depth interviews were used to collect the data, Nvivo 11 software was used to organize the data, and Colaizzi's 7-step descriptive phenomenology method was used to analyse the data. RESULTS: A total of three themes and nine subthemes were extracted, namely: Experience of emotional changes at different stages (uncertainty before transfer, complex internal activity during transit, ambivalence after transfer); Perception of problems in IHT (poor doctor-patient communication, weak awareness of risk assessment, deficiencies in the transfer procedure); Consciousness of the real needs (emotional respect and closeness, stay informed of the progression of the disease, greater social support). CONCLUSION: Family members of patients in the NICU have complex internal experiences and multiple support needs during IHT, reflecting the need for further standardization of the transport process. In the future, we should improve the mode of safe IHT involving doctors, nurses and family members of patients, ensure the safety of patient transport, meet the social support needs of family members and improve the experience of IHT and the medical satisfaction of family members.

Predictive modelling of transport decisions and resources optimisation in pre-hospital setting using machine learning techniques.

BACKGROUND: The global evolution of pre-hospital care systems faces dynamic challenges, particularly in multinational settings. Machine learning (ML) techniques enable the exploration of deeply embedded data patterns for improved patient care and resource optimisation. This study's objective was to accurately predict cases that necessitated transportation versus those that did not, using ML techniques, thereby facilitating efficient resource allocation. METHODS: ML algorithms were utilised to predict patient transport decisions in a Middle Eastern national pre-hospital emergency medical care provider. A comprehensive dataset comprising 93,712 emergency calls from the 999-call centre was analysed using R programming language. Demographic and clinical variables were incorporated to enhance predictive accuracy. Random Forest (RF), Support Vector Machine (SVM), Extreme Gradient Boosting (XGBoost), and Adaptive Boosting (AdaBoost) algorithms were trained and validated. RESULTS: All the trained algorithm models, particularly XGBoost (Accuracy = 83.1%), correctly predicted patients' transportation decisions. Further, they indicated statistically significant patterns that could be leveraged for targeted resource deployment. Moreover, the specificity rates were high; 97.96% in RF and 95.39% in XGBoost, minimising the incidence of incorrectly identified "Transported" cases (False Positive). CONCLUSION: The study identified the transformative potential of ML algorithms in enhancing the quality of pre-hospital care in Qatar. The high predictive accuracy of the employed models suggested actionable avenues for day and time-specific resource planning and patient triaging, thereby having potential to contribute to pre-hospital quality, safety, and value improvement. These findings pave the way for more nuanced, data-driven quality improvement interventions with significant implications for future operational strategies.

Simulated impact of lift car sizes on transport of critical care patients: Informing the design of the New Dunedin Hospital.

The New Dunedin Hospital (NDH) is New Zealand's largest health infrastructure build. Here we describe the use of a simple simulation-based hospital design exercise to inform the appropriate lift car size for critical care intrahospital transfers in the NDH. The intensive care unit (ICU) user group tested a series of entries and exits of simulated complex patient transfers in mocked-up lift cars of three different dimensions. Time taken to enter and exit the lift were recorded, reflecting the relative difficulty of transfer. Qualitative assessments were made of ease and perceived safety of transfer. These simulations demonstrated that recommended standard patient lift cars, often proposed for critical care transfers, could not physically accommodate all complex ICU transfers. A size of 1800 mm wide (W) × 3000 mm deep (D) had the physical capacity to permit all simulated ICU transfers, but with staff and patient risk. As lift car size increased to 2200 mm W × 3300 mm D, the simulation demonstrated reduced transfer times, smoother entry and exit, improved access to the head end of the bed, and reduced risk of disconnection or dislodgement of lines and airway support. The resultant clinical recommendations for the dimensions of a critical care lift car surpass current international health architecture guidelines and may help to inform future updates. The NDH project benefited from an objective assessment of risk, in language familiar to clinicians and healthcare architects. The outcome was an upsizing of the two ICU-capable lifts.

Characteristics and special challenges of neonatal emergency transports.

BACKGROUND: As a rule, newborns do not require special medical care. If unexpected complications occur peripartum or postpartum, support from and transport to specialised neonatal hospitals might be needed. METHODS: In a retrospective study, all transport protocols of a supraregional paediatric­neonatological maximum care hospital in northwestern Germany from 01.10.2018 through 30.09.2021 were analysed. The particular focus was on transports of newborns (<7 days) and the leading symptoms that led to contact. RESULTS: A total of 299 patients were included (average age of 15.4 h, 61.6 % males). The average complete transport time was approximately 2 h. Five leading neonatal diseases (respiratory, infectious, asphyxia, cardiac, haematological) were found to represent the causes of >80 % of transfers. Respiratory adaptation disorders are the main reason for transferring a newborn to a centre, whereas asphyxia is the most severe condition. The various symptoms differ in their time of onset, a factor which must be taken into account in practice. Differences were also found between different types of hospitals: while a large proportion of transports were carried out from maternity hospitals (80.6 %), children transported from children's hospitals were generally more severely ill. DISCUSSION: Transfers of neonates, especially from maternity hospitals to neonatal intensive care units due to special neonatal diseases, are not rare. In times of increasingly scarce resources, the effective care of sick or at-risk neonates is essential. For low-population regions, this means professional cooperation between maximum care providers and smaller children's hospitals and maternity-only hospitals.

Exploring factors influencing time from dispatch to unit availability according to the transport decision in the pre-hospital setting: an exploratory study.

BACKGROUND: Efficient resource distribution is important. Despite extensive research on response timings within ambulance services, nuances of time from unit dispatch to becoming available still need to be explored. This study aimed to identify the determinants of the duration between ambulance dispatch and readiness to respond to the next case according to the patients' transport decisions. METHODS: Time from ambulance dispatch to availability (TDA) analysis according to the patients' transport decision (Transport versus Non-Transport) was conducted using R-Studio™ for a data set of 93,712 emergency calls managed by a Middle Eastern ambulance service from January to May 2023. Log-transformed Hazard Ratios (HR) were examined across diverse parameters. A Cox regression model was utilised to determine the influence of variables on TDA. Kaplan-Meier curves discerned potential variances in the time elapsed for both cohorts based on demographics and clinical indicators. A competing risk analysis assessed the probabilities of distinct outcomes occurring. RESULTS: The median duration of elapsed TDA was 173 min for the transported patients and 73 min for those not transported. The HR unveiled Significant associations in various demographic variables. The Kaplan-Meier curves revealed variances in TDA across different nationalities and age categories. In the competing risk analysis, the 'Not Transported' group demonstrated a higher incidence of prolonged TDA than the 'Transported' group at specified time points. CONCLUSIONS: Exploring TDA offers a novel perspective on ambulance services' efficiency. Though promising, the findings necessitate further exploration across diverse settings, ensuring broader applicability. Future research should consider a comprehensive range of variables to fully harness the utility of this period as a metric for healthcare excellence.

Addressing transportation barriers in oncology: existing programs and new solutions.

Transportation is an underrecognized, but modifiable barrier to accessing cancer care, especially for clinical trials. Clinicians, insurers, and health systems can screen patients for transportation needs and link them to transportation. Direct transportation services (i.e., ride-sharing, insurance-provided transportation) have high rates of patient satisfaction and visit completion. Patient financial reimbursements provide necessary funds to counteract the effects of transportation barriers, which can lead to higher trial enrollment, especially for low socioeconomic status and racially and ethnically diverse patients. Expanding transportation interventions to more cancer patients, and addressing knowledge, service, and system gaps, can help more patients access needed cancer care.

Assessing patient transport conditions during ambulance transit.

Emergency ambulances play a vital role in medical rescue and patient transportation, but their transit can impact patient health due to vehicle dynamic forces and vibrations. This study evaluates patient transport conditions on a stretcher subjected to vertical vibration excitation from road unevenness. Using an eight-degree-of-freedom numerical model, we analyze the construction parameters of a medical stretcher's support and vehicle suspension. Actual experimental data from an emergency vehicle were utilized to assess the vibration conditions experienced by both the stretcher and the ambulance floor. The model is adjusted based on measurements, specifically targeting the main vibration modes. The investigation involves determining temporal responses for vertical accelerations and characterizing vibration modal parameters under various transportation conditions. Notably, several system natural frequencies fall within the range of human body frequencies, making them susceptible to mechanical excitation, particularly in the human neck, abdomen, and spine. A sensitivity analysis underscores the influence of medical stretcher support structure parameters on patient comfort. Increasing support stiffness, which alters the stretcher's natural frequency, and damping coefficient reduce vibration propagation between the vehicle and the patient. Additionally, the research predicts the model's dynamic behavior on roads with low-quality pavement, indicating vibrational amplitudes that could potentially be discomforting and unhealthy for individuals. The study illustrates a vibration exposure period on a class E road, revealing that transportation longer than 25 min may cause damage to patient health.

Air Transportation Impact on a Late Preterm Neonate.

BACKGROUND: Neonatal air transportation is a crucial means of moving critically ill or sick neonates to specialized neonatal intensive care units or medical centers for consultation, regardless of distance or geographical limits. Proper preparation and consideration of air transport can help alleviate medical emergencies and ensure safe delivery. However, crewmembers and neonates may face stress during transportation. To date, there are few studies on neonatal air transportation in Taiwan.CASE REPORT: We present the case of a late preterm neonate born with neonatal respiratory distress syndrome and polycythemia, who was also diagnosed with patent ductus arteriosus and mild pulmonary arterial hypertension on echocardiography. Due to disease progression, the neonate underwent endotracheal intubation and was subsequently transported to a medical center in Taiwan via a rotary-wing aircraft at 3 d of age. During takeoff and landing, a temporary oxygen desaturation event occurred. The physiological changes in these patients have seldom been discussed. This case emphasizes the important considerations of neonatal transport in Taiwan.DISCUSSION: The air transport process could be influenced by both the patient's medical condition and environmental factors. In preterm infants with cardiopulmonary conditions, thorough assessment is necessary for ensuring safe transportation.Li S-P, Hsu P-C, Huang C-Y, Wu P-W, Fang H-H. Air transportation impact on a late preterm neonate. Aerosp Med Hum Perform. 2024; 95(4):219-222.

Can critical care transport be safely reduced in children intubated during emergency management of status epilepticus in the United Kingdom: a national audit with case-control analysis.

OBJECTIVE: This study describes the baseline clinical characteristics, predictors of successful extubation at referring hospitals and short-term outcomes of children intubated for status epilepticus and referred to United Kingdom (UK) paediatric critical care transport teams (PCCTs). DESIGN: Multicentre audit with case-control analysis, conducted between 1 September 2018 and 1 September 2020. SETTING: This study involved 10 UK PCCTs. PATIENTS: Children over 1 month of age intubated during emergency management for status epilepticus (SE), referred to UK PCCTs. Patients with trauma, requiring time-critical neurosurgical intervention or those with a tracheostomy were excluded. INTERVENTIONS: No interventions were implemented. MEASUREMENTS AND MAIN RESULTS: Out of the 1622 referrals for SE, 1136 (70%) were intubated at referral. The median age was 3 years (IQR 1.25-6.54 years). Among the intubated children, 396 (34.8%) were extubated locally by the referring team, with 19 (4.8%) requiring reintubation. Therefore, the overall rate of successful extubation was 33% (377/1136). There was significant variation between PCCTs, with local extubation rates ranging from 2% to 74%. Multivariable analyses showed region/PCCT, contributing diagnosis, acute changes on CT, preceding encephalopathy and type of continuous sedation (midazolam) used postintubation were significantly associated with transfer to a critical care unit. CONCLUSION: This study highlights wide regional variation in early extubation practices. Regions with high successful extubation rates have established extubation guidelines from PCCTs. Successful extubation represents critical care transports that have been avoided.