Ignite Creation Date:
2024-05-06 @ 6:30 PM
Last Modification Date:
2024-10-26 @ 2:49 PM
Study NCT ID:
NCT05688202
Status:
COMPLETED
Last Update Posted:
2023-10-04
First Post:
2022-12-21
Brief Title:
Simultaneous Versus Sequential Fractional CO2 Laser and Subcision Combination for Post-acne Atrophic Scars A Split-face Comparative Study
Sponsor:
Ho Chi Minh City Hospital of Dermato-Venereology
Organization:
Ho Chi Minh City Hospital of Dermato-Venereology
Study Overview
Official Title:
Simultaneous Versus Sequential Fractional CO2 Laser and Subcision Combination for Post-acne Atrophic Scars A Split-face Comparative Study
Status:
COMPLETED
Status Verified Date:
2023-10
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Acne vulgaris a disease of the pilosebaceous unit is estimated to afflict 94 of the global population making it the eighth most prevalent and third most significant disease according to the global burden of disease Post-acne atrophic scars may develop in 95 of acne patients due to aberrant wound healing that affects the pilosebaceous unit and surrounding tissue Scars are cosmetically unattractive contributing to the severe psychosocial discomfort observed in acne vulgaris patients
Several approaches exist for the treatment of post-acne atrophic scars depending on various factors such as the individuals condition the types of scars present and the associated expenses However treating atrophic acne scars remains challenging for physicians because there is no gold-standard treatment Thus combinations of interventions are typically necessary
Fractional CO2 laser and subcision are therapeutic methods proven to be effective in treating post-acne atrophic scars By creating hundreds of thousands of micro-heat treatment zones MTZs fractional CO2 lasers emitting small focal spots 50-80 m via high-focusing mirrors can efficiently treat acne scars These thermal damage columns accelerate the healing process of collagen synthesis Subcision which can be safely paired with other operations should be the initial step in treating acne scars since it separates scars from underlying structures Although several studies proposed that the combination of fractional CO2 laser and subcision was more efficacious than a single therapeutic modality no study has to date compared the efficacy and safety of simultaneous versus sequential combination of these two methods in the treatment of post-acne atrophic scars There is a critical need for basic research on the effectiveness and adverse events of combining modalities sequentially as compared to simultaneously due to the high expense of traveling and the downtime needed to recover after each treatment especially for diseases requiring long-term and periodic intervention such as post-acne atrophic scars
Wound healing is a dynamic process with four distinct but overlapping phases hemostasis inflammation proliferation and remodeling The proliferation phase during which new tissue is formed by a matrix of collagen elastin glycosaminoglycans and other fibrous proteins begins about four to twenty-one days following an injury If sequential modalities interfere with each others proliferative processes therapeutic efficacy may be compromised Therefore our working hypothesis that simultaneous combination is more effective than sequential combination is based on the fact that if the wound-healing process is interrupted it may stop or progress inadequately In addition the investigators anticipate no significant difference between these methods in terms of adverse events frequency and severity but the downtime in the sequential combination group might be greater than that of the simultaneous combination group The investigators propose to test the hypothesis by addressing the following two specific aims
Aim 1 to compare the efficacy and patient satisfaction of simultaneous versus sequential treatment using fractional CO2 laser plus subcision
Aim 2 To compare adverse reactions of simultaneous and sequential treatment using fractional CO2 laser plus subcision
Upon completion of this study the investigators will have a compared the treatment outcome of simultaneously versus sequentially combined fractional CO2 laser plus subcision based on ECCA clinical grading score patient satisfaction and skin thickness via high-frequency ultrasonography and b compared the incidence and duration of adverse events in simultaneous versus sequential treatment Optimizing the combination of different interventions will contribute to more efficacious and economical treatment protocols for post-acne atrophic scars
Several approaches exist for the treatment of post-acne atrophic scars depending on various factors such as the individuals condition the types of scars present and the associated expenses However treating atrophic acne scars remains challenging for physicians because there is no gold-standard treatment Thus combinations of interventions are typically necessary
Fractional CO2 laser and subcision are therapeutic methods proven to be effective in treating post-acne atrophic scars By creating hundreds of thousands of micro-heat treatment zones MTZs fractional CO2 lasers emitting small focal spots 50-80 m via high-focusing mirrors can efficiently treat acne scars These thermal damage columns accelerate the healing process of collagen synthesis Subcision which can be safely paired with other operations should be the initial step in treating acne scars since it separates scars from underlying structures Although several studies proposed that the combination of fractional CO2 laser and subcision was more efficacious than a single therapeutic modality no study has to date compared the efficacy and safety of simultaneous versus sequential combination of these two methods in the treatment of post-acne atrophic scars There is a critical need for basic research on the effectiveness and adverse events of combining modalities sequentially as compared to simultaneously due to the high expense of traveling and the downtime needed to recover after each treatment especially for diseases requiring long-term and periodic intervention such as post-acne atrophic scars
Wound healing is a dynamic process with four distinct but overlapping phases hemostasis inflammation proliferation and remodeling The proliferation phase during which new tissue is formed by a matrix of collagen elastin glycosaminoglycans and other fibrous proteins begins about four to twenty-one days following an injury If sequential modalities interfere with each others proliferative processes therapeutic efficacy may be compromised Therefore our working hypothesis that simultaneous combination is more effective than sequential combination is based on the fact that if the wound-healing process is interrupted it may stop or progress inadequately In addition the investigators anticipate no significant difference between these methods in terms of adverse events frequency and severity but the downtime in the sequential combination group might be greater than that of the simultaneous combination group The investigators propose to test the hypothesis by addressing the following two specific aims
Aim 1 to compare the efficacy and patient satisfaction of simultaneous versus sequential treatment using fractional CO2 laser plus subcision
Aim 2 To compare adverse reactions of simultaneous and sequential treatment using fractional CO2 laser plus subcision
Upon completion of this study the investigators will have a compared the treatment outcome of simultaneously versus sequentially combined fractional CO2 laser plus subcision based on ECCA clinical grading score patient satisfaction and skin thickness via high-frequency ultrasonography and b compared the incidence and duration of adverse events in simultaneous versus sequential treatment Optimizing the combination of different interventions will contribute to more efficacious and economical treatment protocols for post-acne atrophic scars
Detailed Description:
BACKGROUND
Acne vulgaris and post-acne atrophic scar
Acne vulgaris a highly prevalent multifactorial disorder of the pilosebaceous unit is characterized by symptomatic discomfort scarring emotional and psychological suffering occupational implications and the potential for psychiatric disorders such as depression and suicide According to the Global Burden of Disease Project acne has a prevalence of 94 making it the third most significant and the eighth most widespread disease globally
Post-acne scarring is a permanent significant consequence of acne vulgaris affecting 90 to 95 percent of acne patients regardless of severity with 30 percent suffering from severe scarring Atrophic scarring is frequently unsatisfactory from an aesthetic standpoint contributing to the severe emotional distress reported in acne vulgaris patients One of the primary driving factors for individuals seeking acne treatment is the concern about scarring
Severity assessment of post-acne atrophic scars is fundamental for patient counseling appropriate treatment methods selection treatment efficacy evaluation and scientific study Current severity assessment methods of post-acne atrophic scarring involve clinical grading scales such as the ECCA score echelle devaluation clinique des cicatrices dacne and objective imaging techniques such as high-frequency ultrasonography
Treatment of post-acne atrophic scars often involves combinations of modalities since no single treatment method can effectively treat all kinds of scars in every patient However the outcome is adversely affected by various factors such as the individuals condition the types of scars present the selected treatment methods and the paradigm of combining these treatment procedures Until now there has been no study or consensus in the literature regarding the interval between the two interventions
Fractional CO2 laser
For more than 20 years CO2 laser resurfacing has been utilized to treat skin conditions Initially they were utilized to cure photoaging but they are now being used to repair scars caused by trauma surgery burns and acne Ablative resurfacing involves the use of light-based energy to destroy skin layers The tissue surrounding the ablative zone is thermally coagulated After an injury a reparative mechanism generates new collagen elastic fibers and epidermis Newer versions of CO2 make use of fractionated laser beams as opposed to non-fractionated devices By doing so cell columns are preserved and these untreated ones aid in skin rejuvenation The development of new collagen and epithelium can improve the appearance of acne scars when applied with fractional lasers Several advancements have been made in using lasers to treat acne scars over the past several years The treatment of acne scars has significantly improved by employing combinations of modalities
Different types of atrophic scars respond inconsistently to fractional CO2 laser Icepick scars which are narrow and deep to the deep dermis or the hypodermis respond poorly to fractional CO2 laser In contrast rolling scars and shallow boxcar scars can be effectively treated with fractional CO2 laser Additionally the treatment effect of fractional CO2 laser is stable and long-lasting with evidence shown to last until three years after treatment Common side effects include erythema swelling post-inflammatory hyperpigmentation PIH pain crusting and scaling
Subcision Orentreich developed subcision in 1995 in order to treat the underlying pathophysiology of rolling acne scars These scars have a wide undulating appearance on the skins surface and lack the clearly defined edges of boxcar and ice pick scars Rolling scars despite their superficial appearance result from deep fibrous attachments connecting the epidermis to the subcutis Subcision is intended to sever these fibrous bands with minimum harm to the skins surface Typically this procedure raises the depressed scar to the same level as the surrounding skin David and Norman Orentreich the inventors of this technology suggest that the enhancing effect observed following subcision is the product of two separate processes As soon as the scar base is liberated from its tethers there is an instantaneous partial elevation In the weeks following subcision it is typical to detect further augmentation of the depressed defect This following elevation is believed to be the consequence of a wound-healing reaction that culminates in the deposition of new connective tissue beneath the surface of the scar
Subcision can create long-lasting improvement in the texture of rolling acne scars while inflicting minimal damage to the skins surface The technique is simple to perform and typically well tolerated Despite the possibility of bruising and swelling the recovery time is short In addition the necessary materials are affordable and generally available
There is no assurance that a single subcision procedure will result in significant improvement Since the final outcome of the process depends on the individuals unique wound-healing reaction it is sometimes difficult to anticipate the outcome of the initial therapy Some individuals require many treatment sessions or additional procedures like other methods for atrophic scars such as resurfacing or filler injections to get optimal results
Erythema bruising edema and discomfort are typical after subcision and may last for 1-2 weeks Other uncommon adverse events are the creation of cystic acneiform lesions and hypertrophic or exaggerated responses
Current paradigms in combining fractional CO2 laser and subcision
Numerous studies have demonstrated that the combination of fractional CO2 laser and subcision is more efficacious than either treatment alone in treating post-acne atrophic scars In the majority of trials subcision was done prior to laser treatments with the interval between the two procedures ranging from simultaneous one day to two or three weeks There is a paucity of data concerning the efficacy and safety of therapy combinations with different intervals between procedures It is unknown whether concurrent operations are more effective than sequential ones Numerous adverse events of fractional CO2 laser plus subcision have been found in several publications However little is known about the differences between the two combination paradigms in terms of side effects
Hypothesis and aims
Based on current knowledge of the wound healing process and the mechanics of fractional CO2 laser and subcision in treating post-acne atrophic scars the investigators hypothesize that the simultaneous combination of fractional CO2 laser plus subcision is more efficacious than the sequential combination for the treatment of post-acne atrophic scars Wound healing is a dynamic process characterized by four distinct but overlapping phases hemostasis inflammation proliferation and remodeling The proliferation phase during which a matrix of collagen elastin glycosaminoglycans and other fibrous proteins produce new tissue begins four to twenty-one days after an injury If consecutive modalities interfere with each others proliferative activities the wound-healing process may be halted or progress insufficiently In addition the investigators do not expect a substantial difference between both approaches in terms of the incidence and severity of side effects however the downtime in the sequential combination group may be more than that of the simultaneous combination group The present study is designed to test the above hypothesis by pursuing the following specific aims
Aim 1 to compare the effectiveness and patient satisfaction of simultaneous versus sequential fractional CO2 laser plus subcision In this aim the investigators will conduct a longitudinal study of post-acne atrophic scar patients to identify clinical improvements and patient satisfaction in both treatment groups Outcomes are assessed via clinical evaluation based on ECCA score and biometrics utilizing HFUS
Aim 2 to compare the safety of simultaneous versus sequential fractional CO2 laser plus subcision In this aim the investigators will utilize the patient population in Aim 1 to identify and compare adverse events in both treatment groups
Treatment protocol
Each patient will undergo three sessions of subcision combined with fractional CO2 laser with a 1-month interval between sessions The faces left side is treated with simultaneous combination therapy in which fractional CO2 laser is performed immediately following subcision The faces right side receives sequential combination therapy with fractional CO2 laser conducted two weeks after subcision
Before the procedure
Participants having a history of herpes simplex infection are prescribed oral antiviral tablets containing 400 mg of Acyclovir twice daily for five days starting two days before the procedure Preoperative lidocaine 25 and prilocaine 25 cream EMLA eutectic mixture of local anesthetic AstraZeneca LP Wilmington DE USA is applied under occlusion for 60 minutes prior to the removal of local anesthetics A 500 mg paracetamol-based oral analgesic is administered right before the procedure
Subcision
Subcision is operated in all participants using an 1812G Nokor needle BD Nokor Admix Needles Becton Dickinson and Company New Jersey United States The operation sites are sterilized with alcohol pads and injected intradermally with a solution of 2 lidocaine After obtaining appropriate anesthesia a Nokor needle is inserted into the skin close to the depressed scars and progressed until it lays precisely under the scar The insertion depth is at the dermal-hypodermal junction Initially the subcision needle is advanced and retracted in a tunneling motion to penetrate the fibrotic scar tissue Once the fibrous mass has been sufficiently fractured the needle is slid in a direction parallel to the skins surface in order to detach the scar from its tethers For densely fibrous scars several needle insertion sites are used to undermine the defect from various angles
Laser CO2 fractional
All participants undergo FrCO2 laser 10 600-nm eCO2 laser Lutronic Corporation Goyang Korea on both sides of the face sequentially with a two-week interval between sessions for each faces side by a single physician with the parameters following the suggested regimen at static mode 120 μm beam size 30 W peak power 30 - 120 mJ pulse energy 50-75 spotscm2 density with two passes At the first pass only the atrophic scars are treated using a 4mm square or circle pattern 100-120 mJ pulse energy and 50 spotscm2 density in the static operating mode At the second pass the whole half side of the face is treated using a 12mm square pattern 30-40 mJ pulse energy and 75 spotscm2 density in the static operating mode with less than 10 overlap
After the procedure
Right after the procedure participants faces are cooled by wet dressings with NaCl 09 and sterilized gauze is applied to cover the treated area Following subcision antibiotic ointment and oral antibiotics may be prescribed
Statistical method
Statistical analyses are performed using R 422 binary for macOS Big Sur Apple silicon Macs M1 Continuous variables with normal distributions are presented as mean standard deviation and median minimum-maximum for those with abnormal distributions Categorial variables are summarized as frequencies and percentages Students t-test or Mann-Whitney-Wilcoxon test are used to show the differences between dependent numerical groups with and without normal distribution respectively Paired t-test or Wilcoxon Signed Rank is used to compare continuous variables in the same group For dichotomous variables the Chi-squared test or Fisher is used as appropriate A p-value less than 005 is considered significant
INNOVATION AND CREATIVITY STATEMENT
Post-acne atrophic scars treatment either single or combined intervention poses a major challenge for physicians More importantly prolonged downtime and irritated adverse events prevent patients from adhering long time treatment This project and its methodology represent an essential shift in the strategy of combining different methods for treating post-acne atrophic scars thereby contributing to better treatment and reducing adverse events
A clarification in paradigm
Currently there are two approaches of combination between fractional CO2 laser and subcision sequential combination in which two interventions are performed days to weeks apart and simultaneous combination Each of these strategies has major disadvantages The sequential treatment downtime is prolonged and its adherence is poor since patients must pay multiple time-consuming visits to pursue it Because simultaneous treatment is assumed to associate with more severe skin damage and side effects such as pain and swelling simultaneous combination remains limited in routine clinical practice Until now there has been no study or consensus on the interval between the two interventions
Our project represents a radical clarification of the current paradigm By comparing the efficacy and safety of different combination strategies the investigators can identify a better combination method to effectively treat post-acne atrophic scars
Advanced method for objective assessment
Apart from treatment evaluation using clinical score scales ECCA score based on photographs our project assesses treatment efficacy by measuring biometrics utilizing high-frequency ultrasonography
So far the majority of publications have utilized photographs and interviewed patients receiving treatment about their satisfaction with therapeutic effects to evaluate acne scars and treatment outcomes This approach gives a preliminary assessment of the treatment although it is subjective and lacks precision There have been a few reports of histologic research but they are invasive This diagnostic gap may be filled by high-frequency ultrasonography HFUS It has been used in dermatology for more than 20 years to study and quantify skin changes associated with various diseases This imaging technology enables precise measurements of skin thickness It has been demonstrated that HFUS is objective reliable and safe for the patient in several fields of dermatology cosmetology and aesthetic medicine
SIGNIFICANT STATEMENT
Our project has clinical significance as it will address an unmet need and allow an improved treatment paradigm with more efficacy safety and convenience
Addressing an unmet clinical need
Acne vulgaris is the third most burden disease and post-acne atrophic scars inflict more than 95 of acne patients Despite recent progress in treatment post-acne atrophic scar patients still have poor outcomes There are multiple methods for treating post-acne atrophic scars based on considerations such as the individuals condition the scar types present and the associated expenditures However treating atrophic acne scars remains difficult because there is no best therapy for this condition Consequently combinations of interventions are becoming a new essential trend and are more widely used These practical needs have raised questions about the combination paradigms aspects such as interventional timing efficacy and safety
Improving treatment paradigm
Efficacy and safety present major challenges to the treatment of post-acne atrophic scar patients since clinical improvements require multiple treatment sessions and a long follow-up time to observe Moreover side effects often occur and take extended downtime to recover which are irritable or unacceptable to some patients However improvements in scar appearance are sometimes modest As interventional timing plays an essential role in combining different therapeutic modalities comparing simultaneous and sequential combinations helps physicians to select a more effective therapeutic paradigm and hence improve treatment outcomes
Acne vulgaris and post-acne atrophic scar
Acne vulgaris a highly prevalent multifactorial disorder of the pilosebaceous unit is characterized by symptomatic discomfort scarring emotional and psychological suffering occupational implications and the potential for psychiatric disorders such as depression and suicide According to the Global Burden of Disease Project acne has a prevalence of 94 making it the third most significant and the eighth most widespread disease globally
Post-acne scarring is a permanent significant consequence of acne vulgaris affecting 90 to 95 percent of acne patients regardless of severity with 30 percent suffering from severe scarring Atrophic scarring is frequently unsatisfactory from an aesthetic standpoint contributing to the severe emotional distress reported in acne vulgaris patients One of the primary driving factors for individuals seeking acne treatment is the concern about scarring
Severity assessment of post-acne atrophic scars is fundamental for patient counseling appropriate treatment methods selection treatment efficacy evaluation and scientific study Current severity assessment methods of post-acne atrophic scarring involve clinical grading scales such as the ECCA score echelle devaluation clinique des cicatrices dacne and objective imaging techniques such as high-frequency ultrasonography
Treatment of post-acne atrophic scars often involves combinations of modalities since no single treatment method can effectively treat all kinds of scars in every patient However the outcome is adversely affected by various factors such as the individuals condition the types of scars present the selected treatment methods and the paradigm of combining these treatment procedures Until now there has been no study or consensus in the literature regarding the interval between the two interventions
Fractional CO2 laser
For more than 20 years CO2 laser resurfacing has been utilized to treat skin conditions Initially they were utilized to cure photoaging but they are now being used to repair scars caused by trauma surgery burns and acne Ablative resurfacing involves the use of light-based energy to destroy skin layers The tissue surrounding the ablative zone is thermally coagulated After an injury a reparative mechanism generates new collagen elastic fibers and epidermis Newer versions of CO2 make use of fractionated laser beams as opposed to non-fractionated devices By doing so cell columns are preserved and these untreated ones aid in skin rejuvenation The development of new collagen and epithelium can improve the appearance of acne scars when applied with fractional lasers Several advancements have been made in using lasers to treat acne scars over the past several years The treatment of acne scars has significantly improved by employing combinations of modalities
Different types of atrophic scars respond inconsistently to fractional CO2 laser Icepick scars which are narrow and deep to the deep dermis or the hypodermis respond poorly to fractional CO2 laser In contrast rolling scars and shallow boxcar scars can be effectively treated with fractional CO2 laser Additionally the treatment effect of fractional CO2 laser is stable and long-lasting with evidence shown to last until three years after treatment Common side effects include erythema swelling post-inflammatory hyperpigmentation PIH pain crusting and scaling
Subcision Orentreich developed subcision in 1995 in order to treat the underlying pathophysiology of rolling acne scars These scars have a wide undulating appearance on the skins surface and lack the clearly defined edges of boxcar and ice pick scars Rolling scars despite their superficial appearance result from deep fibrous attachments connecting the epidermis to the subcutis Subcision is intended to sever these fibrous bands with minimum harm to the skins surface Typically this procedure raises the depressed scar to the same level as the surrounding skin David and Norman Orentreich the inventors of this technology suggest that the enhancing effect observed following subcision is the product of two separate processes As soon as the scar base is liberated from its tethers there is an instantaneous partial elevation In the weeks following subcision it is typical to detect further augmentation of the depressed defect This following elevation is believed to be the consequence of a wound-healing reaction that culminates in the deposition of new connective tissue beneath the surface of the scar
Subcision can create long-lasting improvement in the texture of rolling acne scars while inflicting minimal damage to the skins surface The technique is simple to perform and typically well tolerated Despite the possibility of bruising and swelling the recovery time is short In addition the necessary materials are affordable and generally available
There is no assurance that a single subcision procedure will result in significant improvement Since the final outcome of the process depends on the individuals unique wound-healing reaction it is sometimes difficult to anticipate the outcome of the initial therapy Some individuals require many treatment sessions or additional procedures like other methods for atrophic scars such as resurfacing or filler injections to get optimal results
Erythema bruising edema and discomfort are typical after subcision and may last for 1-2 weeks Other uncommon adverse events are the creation of cystic acneiform lesions and hypertrophic or exaggerated responses
Current paradigms in combining fractional CO2 laser and subcision
Numerous studies have demonstrated that the combination of fractional CO2 laser and subcision is more efficacious than either treatment alone in treating post-acne atrophic scars In the majority of trials subcision was done prior to laser treatments with the interval between the two procedures ranging from simultaneous one day to two or three weeks There is a paucity of data concerning the efficacy and safety of therapy combinations with different intervals between procedures It is unknown whether concurrent operations are more effective than sequential ones Numerous adverse events of fractional CO2 laser plus subcision have been found in several publications However little is known about the differences between the two combination paradigms in terms of side effects
Hypothesis and aims
Based on current knowledge of the wound healing process and the mechanics of fractional CO2 laser and subcision in treating post-acne atrophic scars the investigators hypothesize that the simultaneous combination of fractional CO2 laser plus subcision is more efficacious than the sequential combination for the treatment of post-acne atrophic scars Wound healing is a dynamic process characterized by four distinct but overlapping phases hemostasis inflammation proliferation and remodeling The proliferation phase during which a matrix of collagen elastin glycosaminoglycans and other fibrous proteins produce new tissue begins four to twenty-one days after an injury If consecutive modalities interfere with each others proliferative activities the wound-healing process may be halted or progress insufficiently In addition the investigators do not expect a substantial difference between both approaches in terms of the incidence and severity of side effects however the downtime in the sequential combination group may be more than that of the simultaneous combination group The present study is designed to test the above hypothesis by pursuing the following specific aims
Aim 1 to compare the effectiveness and patient satisfaction of simultaneous versus sequential fractional CO2 laser plus subcision In this aim the investigators will conduct a longitudinal study of post-acne atrophic scar patients to identify clinical improvements and patient satisfaction in both treatment groups Outcomes are assessed via clinical evaluation based on ECCA score and biometrics utilizing HFUS
Aim 2 to compare the safety of simultaneous versus sequential fractional CO2 laser plus subcision In this aim the investigators will utilize the patient population in Aim 1 to identify and compare adverse events in both treatment groups
Treatment protocol
Each patient will undergo three sessions of subcision combined with fractional CO2 laser with a 1-month interval between sessions The faces left side is treated with simultaneous combination therapy in which fractional CO2 laser is performed immediately following subcision The faces right side receives sequential combination therapy with fractional CO2 laser conducted two weeks after subcision
Before the procedure
Participants having a history of herpes simplex infection are prescribed oral antiviral tablets containing 400 mg of Acyclovir twice daily for five days starting two days before the procedure Preoperative lidocaine 25 and prilocaine 25 cream EMLA eutectic mixture of local anesthetic AstraZeneca LP Wilmington DE USA is applied under occlusion for 60 minutes prior to the removal of local anesthetics A 500 mg paracetamol-based oral analgesic is administered right before the procedure
Subcision
Subcision is operated in all participants using an 1812G Nokor needle BD Nokor Admix Needles Becton Dickinson and Company New Jersey United States The operation sites are sterilized with alcohol pads and injected intradermally with a solution of 2 lidocaine After obtaining appropriate anesthesia a Nokor needle is inserted into the skin close to the depressed scars and progressed until it lays precisely under the scar The insertion depth is at the dermal-hypodermal junction Initially the subcision needle is advanced and retracted in a tunneling motion to penetrate the fibrotic scar tissue Once the fibrous mass has been sufficiently fractured the needle is slid in a direction parallel to the skins surface in order to detach the scar from its tethers For densely fibrous scars several needle insertion sites are used to undermine the defect from various angles
Laser CO2 fractional
All participants undergo FrCO2 laser 10 600-nm eCO2 laser Lutronic Corporation Goyang Korea on both sides of the face sequentially with a two-week interval between sessions for each faces side by a single physician with the parameters following the suggested regimen at static mode 120 μm beam size 30 W peak power 30 - 120 mJ pulse energy 50-75 spotscm2 density with two passes At the first pass only the atrophic scars are treated using a 4mm square or circle pattern 100-120 mJ pulse energy and 50 spotscm2 density in the static operating mode At the second pass the whole half side of the face is treated using a 12mm square pattern 30-40 mJ pulse energy and 75 spotscm2 density in the static operating mode with less than 10 overlap
After the procedure
Right after the procedure participants faces are cooled by wet dressings with NaCl 09 and sterilized gauze is applied to cover the treated area Following subcision antibiotic ointment and oral antibiotics may be prescribed
Statistical method
Statistical analyses are performed using R 422 binary for macOS Big Sur Apple silicon Macs M1 Continuous variables with normal distributions are presented as mean standard deviation and median minimum-maximum for those with abnormal distributions Categorial variables are summarized as frequencies and percentages Students t-test or Mann-Whitney-Wilcoxon test are used to show the differences between dependent numerical groups with and without normal distribution respectively Paired t-test or Wilcoxon Signed Rank is used to compare continuous variables in the same group For dichotomous variables the Chi-squared test or Fisher is used as appropriate A p-value less than 005 is considered significant
INNOVATION AND CREATIVITY STATEMENT
Post-acne atrophic scars treatment either single or combined intervention poses a major challenge for physicians More importantly prolonged downtime and irritated adverse events prevent patients from adhering long time treatment This project and its methodology represent an essential shift in the strategy of combining different methods for treating post-acne atrophic scars thereby contributing to better treatment and reducing adverse events
A clarification in paradigm
Currently there are two approaches of combination between fractional CO2 laser and subcision sequential combination in which two interventions are performed days to weeks apart and simultaneous combination Each of these strategies has major disadvantages The sequential treatment downtime is prolonged and its adherence is poor since patients must pay multiple time-consuming visits to pursue it Because simultaneous treatment is assumed to associate with more severe skin damage and side effects such as pain and swelling simultaneous combination remains limited in routine clinical practice Until now there has been no study or consensus on the interval between the two interventions
Our project represents a radical clarification of the current paradigm By comparing the efficacy and safety of different combination strategies the investigators can identify a better combination method to effectively treat post-acne atrophic scars
Advanced method for objective assessment
Apart from treatment evaluation using clinical score scales ECCA score based on photographs our project assesses treatment efficacy by measuring biometrics utilizing high-frequency ultrasonography
So far the majority of publications have utilized photographs and interviewed patients receiving treatment about their satisfaction with therapeutic effects to evaluate acne scars and treatment outcomes This approach gives a preliminary assessment of the treatment although it is subjective and lacks precision There have been a few reports of histologic research but they are invasive This diagnostic gap may be filled by high-frequency ultrasonography HFUS It has been used in dermatology for more than 20 years to study and quantify skin changes associated with various diseases This imaging technology enables precise measurements of skin thickness It has been demonstrated that HFUS is objective reliable and safe for the patient in several fields of dermatology cosmetology and aesthetic medicine
SIGNIFICANT STATEMENT
Our project has clinical significance as it will address an unmet need and allow an improved treatment paradigm with more efficacy safety and convenience
Addressing an unmet clinical need
Acne vulgaris is the third most burden disease and post-acne atrophic scars inflict more than 95 of acne patients Despite recent progress in treatment post-acne atrophic scar patients still have poor outcomes There are multiple methods for treating post-acne atrophic scars based on considerations such as the individuals condition the scar types present and the associated expenditures However treating atrophic acne scars remains difficult because there is no best therapy for this condition Consequently combinations of interventions are becoming a new essential trend and are more widely used These practical needs have raised questions about the combination paradigms aspects such as interventional timing efficacy and safety
Improving treatment paradigm
Efficacy and safety present major challenges to the treatment of post-acne atrophic scar patients since clinical improvements require multiple treatment sessions and a long follow-up time to observe Moreover side effects often occur and take extended downtime to recover which are irritable or unacceptable to some patients However improvements in scar appearance are sometimes modest As interventional timing plays an essential role in combining different therapeutic modalities comparing simultaneous and sequential combinations helps physicians to select a more effective therapeutic paradigm and hence improve treatment outcomes
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None