Ignite Creation Date:
2024-10-26 @ 3:43 PM
Last Modification Date:
2024-10-26 @ 3:43 PM
Study NCT ID:
NCT06651658
Status:
NOT_YET_RECRUITING
Last Update Posted:
None
First Post:
2024-10-17
Brief Title:
Oxford Pleural Embolisation Trial
Sponsor:
None
Organization:
None
Study Overview
Official Title:
Pleural Blood Patch for Lung Ablation a Randomised Trial Oxford Pleural Embolisation Trial - OxPET
Status:
NOT_YET_RECRUITING
Status Verified Date:
2024-10
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
No
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
OxPET
Brief Summary:
Thermal ablation is an established treatment for lung cancer It involves insertion of a applicator under image guidance into a lung tumour and destroying it with radiofrequency microwave or cryotherapy One of the common side effects is pneumothorax which is a leak of gas from the lungs when it punctured Air leak necessitates placement of a drainage tube in more than half of patients undergoing the procedure The drain can be associated with some morbidity including pain reduced mobility prolonged hospital stay and infection Pleural embolization refers to the injection of substances to the linings of the lung to seal air leakage There is published evidence in using pleural embolization with autologous blood blood drawn up from the patients veins to prevent pneumothorax in patients undergoing lung biopsies This technique is also known as pleural blood patch PBP A study involving more than 4000 patients found that PBP reduced the rates of pneumothorax by 35 and drain placement by 55 in lung patients A study using prophylactic gelfoam torpedo embolization for radiofrequency ablation showed significant reduction in chest drain rates
In this study investigators plan to evaluate the PBP using a tandem needle technique in patients undergoing lung ablation at the Oxford Thermal Ablation Service one of the largest units in the country performing about 200 ablations per year mostly microwave ablations Patients will be randomized to receive lung ablation with or without the PBP
The PBP technique is easy to learn enjoys high technical success rates and does not expose the patient to any significant additional risk
The primary outcome is the chest drains rates in the two trial groups
1 patients undergoing lung ablation without PBP and
2 patients undergoing lung ablation with PBP Other outcomes that would be measured include the volume of gas leakage on Computed Tomography CT imaging safety profile length of stay feasibility of same day discharge patient oriented outcomes including validated pain score and institution oriented outcomes including medical costs
A positive trial could significantly reduce the side effect profile of lung ablation and hasten the patients recovery There could be significant savings in healthcare costs as the procedure may become safe to perform as a day procedure as opposed to an overnight procedure
In this study investigators plan to evaluate the PBP using a tandem needle technique in patients undergoing lung ablation at the Oxford Thermal Ablation Service one of the largest units in the country performing about 200 ablations per year mostly microwave ablations Patients will be randomized to receive lung ablation with or without the PBP
The PBP technique is easy to learn enjoys high technical success rates and does not expose the patient to any significant additional risk
The primary outcome is the chest drains rates in the two trial groups
1 patients undergoing lung ablation without PBP and
2 patients undergoing lung ablation with PBP Other outcomes that would be measured include the volume of gas leakage on Computed Tomography CT imaging safety profile length of stay feasibility of same day discharge patient oriented outcomes including validated pain score and institution oriented outcomes including medical costs
A positive trial could significantly reduce the side effect profile of lung ablation and hasten the patients recovery There could be significant savings in healthcare costs as the procedure may become safe to perform as a day procedure as opposed to an overnight procedure
Detailed Description:
Background and existing literature Image guided thermal ablation is an established treatment for lung malignancy including early stage primary cancer and oligometastases It is a minimally invasive technique associated with rapid clinical recovery and its efficacy and safety are comparable to surgical resection and radiotherapy It is also repeatable and feasible for patients contraindicated to other therapies such as those with impaired lung function or interstitial fibrosis
One of the most common side effects of lung ablation is pneumothorax occurring in up to 67 of patients depending on definition Clinically significant pneumothorax typically defined as requiring perioperative insertion of chest drain occurs in up to 58 of patients In a local audit at Oxford University Hospitals last year 317 of lung ablation patients required a chest drain
Pleural or parenchymal tract embolisation using autologous blood pleural blood patch PBP is a recognized technique in pneumothorax prevention in image guided lung biopsies In a meta-analysis including more than 4000 patients drawing on mainly retrospective studies this reduces the risk of pneumothorax by 35 and risks of chest drain by 55
A study using prophylactic gelfoam torpedo embolisation for radiofrequency ablation showed significant reduction in chest drain rates
Rationale and necessity of the OxPET trial
A literature search demonstrates lack of any study examining the prophylactic use of PBP in lung ablation There are important differences between lung biopsy and ablation that dedicated evaluation rather than direct extrapolation of results
1 The ablation applicator is larger at least 16G than the biopsy needle usually 20G
2 The PBP technique in biopsies employ a coaxial technique which involves injection of blood along the same needle after the sample has been taken which is not possible for ablations
3 Ablation causes damage not just along the needle tract but a zone of destruction by thermal energy which may render PBP ineffective
4 Existing study using gelfoam torpedoes studied patients undergoing radiofrequency ablation and in coaxial application of embolisation agent The majority of cases performed in OUH are with microwave technology and non coaxial application
5 Lung ablations are performed under general anaesthesia and ventilation whereas biopsies are performed with local anaesthesia and this may cause a difference in pneumothorax formation
The tandem needle technique is modified for PBP in the setting of ablation This involves intraoperative CT guided insertion of a 21G needle to a position within 5mm of the parietal pleural entry of the ablation applicator This is followed by autologous blood injection upon withdrawal of the ablation applicator This has been evaluated clinically in selected patients at high risk of pneumothorax at OUH with promising preliminary results We plan to publish the data as a pilot study of OxPET
The investigation is performed at the Oxford Thermal Ablation Service a tertiary centre performing around 200 ablations a year
Potential clinical impact The potential clinical impact of this study is highly significant At OUH lung ablations are inpatient procedures requiring overnight stay with planned discharge on the subsequent morning Patients who require a perioperative chest drain will attempt weaning the next day and a significant portion will fail and thus prolong discharge A further 35 of patients develop drain-related complications requiring invasive management such as infection empyema and persistent air leak requiring further invasive management
Significant reduction in pneumothorax rates will reduce the rate of chest drain insertion and its associated morbidities shorten patient stay and hasten recovery Positive trial results may shift the clinical pathway of lung ablation into a day procedure which is increasingly the case for ablation of other organs such as the kidney
Safety profile The PBP technique is extremely safe and no negative effects have been identified in previous meta-analysis involving more than 4000 patients The ablation procedure would induce variable degrees of haemorrhage per se therefore patients undergoing PBP only differs in the amount and location that the patients blood is distributed
There are theoretical risks of introducing infection and pneumothorax during the PBP procedure In our protocol a strict aseptic technique is adopted both for blood taking and ablation PBP procedure A sterile surgical field is maintained and it is routine clinical practice to give a dose of prophylactic antibiotics to all ablation patients The development of infection pleural or pulmonary will be monitored in our study
With regards to pneumothorax induced by the PBP procedure this would be immediately detected and remedied by chest drain insertion if appropriate as the procedure is performed under CT scanning This complication would be recorded within the safety outcome session of the trial
The PBP procedure is also associated with a small additional radiation exposure 03mSv to intervention arm patients The annual background radiation dose in the UK is 27 mSv in comparison This has been assessed by independent medical physics and clinical radiation expert at the local institution Opinion of the physics expert is that the additional radiation for interventional trial participants would cause a 001 increase in lifetime cancer risk The opinion from the clinical radiation expert is that there is no increase in radiation exposure on a clinical level
One of the most common side effects of lung ablation is pneumothorax occurring in up to 67 of patients depending on definition Clinically significant pneumothorax typically defined as requiring perioperative insertion of chest drain occurs in up to 58 of patients In a local audit at Oxford University Hospitals last year 317 of lung ablation patients required a chest drain
Pleural or parenchymal tract embolisation using autologous blood pleural blood patch PBP is a recognized technique in pneumothorax prevention in image guided lung biopsies In a meta-analysis including more than 4000 patients drawing on mainly retrospective studies this reduces the risk of pneumothorax by 35 and risks of chest drain by 55
A study using prophylactic gelfoam torpedo embolisation for radiofrequency ablation showed significant reduction in chest drain rates
Rationale and necessity of the OxPET trial
A literature search demonstrates lack of any study examining the prophylactic use of PBP in lung ablation There are important differences between lung biopsy and ablation that dedicated evaluation rather than direct extrapolation of results
1 The ablation applicator is larger at least 16G than the biopsy needle usually 20G
2 The PBP technique in biopsies employ a coaxial technique which involves injection of blood along the same needle after the sample has been taken which is not possible for ablations
3 Ablation causes damage not just along the needle tract but a zone of destruction by thermal energy which may render PBP ineffective
4 Existing study using gelfoam torpedoes studied patients undergoing radiofrequency ablation and in coaxial application of embolisation agent The majority of cases performed in OUH are with microwave technology and non coaxial application
5 Lung ablations are performed under general anaesthesia and ventilation whereas biopsies are performed with local anaesthesia and this may cause a difference in pneumothorax formation
The tandem needle technique is modified for PBP in the setting of ablation This involves intraoperative CT guided insertion of a 21G needle to a position within 5mm of the parietal pleural entry of the ablation applicator This is followed by autologous blood injection upon withdrawal of the ablation applicator This has been evaluated clinically in selected patients at high risk of pneumothorax at OUH with promising preliminary results We plan to publish the data as a pilot study of OxPET
The investigation is performed at the Oxford Thermal Ablation Service a tertiary centre performing around 200 ablations a year
Potential clinical impact The potential clinical impact of this study is highly significant At OUH lung ablations are inpatient procedures requiring overnight stay with planned discharge on the subsequent morning Patients who require a perioperative chest drain will attempt weaning the next day and a significant portion will fail and thus prolong discharge A further 35 of patients develop drain-related complications requiring invasive management such as infection empyema and persistent air leak requiring further invasive management
Significant reduction in pneumothorax rates will reduce the rate of chest drain insertion and its associated morbidities shorten patient stay and hasten recovery Positive trial results may shift the clinical pathway of lung ablation into a day procedure which is increasingly the case for ablation of other organs such as the kidney
Safety profile The PBP technique is extremely safe and no negative effects have been identified in previous meta-analysis involving more than 4000 patients The ablation procedure would induce variable degrees of haemorrhage per se therefore patients undergoing PBP only differs in the amount and location that the patients blood is distributed
There are theoretical risks of introducing infection and pneumothorax during the PBP procedure In our protocol a strict aseptic technique is adopted both for blood taking and ablation PBP procedure A sterile surgical field is maintained and it is routine clinical practice to give a dose of prophylactic antibiotics to all ablation patients The development of infection pleural or pulmonary will be monitored in our study
With regards to pneumothorax induced by the PBP procedure this would be immediately detected and remedied by chest drain insertion if appropriate as the procedure is performed under CT scanning This complication would be recorded within the safety outcome session of the trial
The PBP procedure is also associated with a small additional radiation exposure 03mSv to intervention arm patients The annual background radiation dose in the UK is 27 mSv in comparison This has been assessed by independent medical physics and clinical radiation expert at the local institution Opinion of the physics expert is that the additional radiation for interventional trial participants would cause a 001 increase in lifetime cancer risk The opinion from the clinical radiation expert is that there is no increase in radiation exposure on a clinical level
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None