Table 1.

Summary of included studies and themes.

Author	Study location	Study period	Study type	Key findings	Themesa
VASCC [15]	Global	Ongoing	Global registry	Elucidate the effect of the deferment of vascular cases Global registry of thrombotic complications of COVID-19	2
Ng [7]	Global	March 2020	Survey	90.9% deferred of elective VS cases 92.2% still performing emergency surgery	3
COVER Tier 1 study [8]	Global	March to May 2020	Survey, global registry	Stricter case selection for carotid intervention Increased threshold for aortic aneurysm repair	2, 3, 6
COVER Tier 2 study [40]	Global	March to May 2020	Global observational study	Elevated in-hospital mortality across aortic, carotid and lower extremity interventions despite low COVID-19 infection rate	8
Aziz [16]	US	April 2020	Survey	Deferment of elective cases Reduced emergency department consults for VS conditions	4, 7
Latz [17]	US	April 2020	Survey	80.5% performing urgent and emergent cases only 15.3% performing emergent cases only	4
Mouawad [18]	US	April 2020	Survey	91.7% cancelled elective cases	4
Mahentiran [19]	US	May 2020	Survey	74% performing urgent and emergent cases only Venous registry volumes reduced fivefold	4
Natarajan [20]	US	May 2020	Survey	Arterial registry volumes reduced sevenfold	4
Mirza [21]	US	March to April 2020	Institutional review	93% of electives deferred Performed urgent and emergent cases	5
Sarfati [22]	US	March to April 2020	Institutional review	Adhered to ACS guidelines Performed tier 2b and tier 3 cases Deferred tier 1, tier 2a, and some tier 2b cases	5
Boschetti [23]	Italy	March to April 2020	Institutional review	37.1% reduction on operative case volume Reduction in emergency room visits Increased presentation of patients with decompensated CLTI	5, 7, 8
Chisci [24]	Italy	March to April 2020	Institutional review	Deferment of nonurgent elective cases Endovascular treatment of CLTI preferred	5, 6
Chiesa [25]	Italy	March to April 2020	Institutional review	Deferment of varicose vein surgery Only symptomatic, urgent or emergent cases performed	5
Piazza [26]	Italy	March to April 2020	Institutional review	Deferment of nonurgent elective cases Performed urgent and emergent cases Higher major amputation rate for CLTI patients	5, 8
Mascia [27]	Italy	March to April 2020	Institutional review	Increased urgent and emergent cases due to referral system Higher proportion of late presentation of limb ischemia 50% reduction in ruptured or symptomatic AAA	5, 7, 8
Pini [28]	Italy	March to April 2020	Institutional review	Priority criteria for elective cases adopted Performed urgent and emergency cases	5
Duarte [29]	Portugal	February to June 2020	Institutional review	17.8% reduction in operative case volume 54% reduction in patients admitted from the ED Significant increase in endovascular procedures Significant increase in use of locoregional anesthesia	5, 6, 7
Gouveia E Melo [30]	Portugal	March 2020	Institutional review	Performed urgent and emergent cases only Decrease in urgent and emergent cases Endovascular approach and locoregional anesthesia preferred	5, 6
Correia [35]	Portugal	March to June 2020	Institutional review	Fewer patients presented to ED compared to 2019 Patients required more urgent surgery compared to 2019	7
Ben Abdallah [31]	France	March to April 2020	Institutional review	Performed only urgent or emergent cases only Endovascular approach favored over open repair Increased number of patients with acute arterial events Significant decrease in overall vascular referrals	5, 6, 7
Connolly [32]	Ireland	March to April 2020	Institutional review	Deferment of nonurgent elective cases Endovascular approach preferred	5, 6
Metelmann [33]	Germany	March to April 2020	Institutional review	Deferment of nonurgent elective cases Performed urgent or emergent cases, ie, high-risk AAA	5
Ünal [34]	Turkey	April 2020	Institutional review	Triaged vascular cases according to “level of priority” Deferred nonurgent elective cases Endovascular approach preferred	5, 6
Leong Tan [36]	Singapore	March to April 2020	Institutional review	Deferred nonurgent elective cases Performed urgent or emergent cases only	5
Ng [37]	Singapore	February to March 2020	Institutional review	Deferred nonurgent elective cases Performed urgent or emergent cases only Increase in major amputation rate	5, 8
Wang [39]	China	April 2020	Institutional review	Deferred nonurgent elective cases Performed urgent or emergent cases only Endovascular approach preferred	5, 6
Bashar [38]	Bangladesh	March to June 2020	Institutional review	Deferred nonurgent elective cases Performed urgent or emergent cases only Higher rates of limb loss in CLTI patients	5, 8

Abbreviations: AAA, abdominal aortic aneurysm; ACS, American College of Surgeons; CLTI, chronic limb threatening ischemia; COVER, COVID-19 Vascular Service Study; COVID-19, coronavirus disease 2019; ED, emergency department; US, United States; VASCC Vascular Surgery COVID-19 Collaborative; VS, vascular surgery.

^aThemes: (1) VS case triage system; (2) emergence of global collaborative VS research groups; (3) global surveys on VS practice; (4) regional surveys on VS practice; (5) institutional changes in VS practice; (6) use of endovascular techniques and locoregional anesthesia; (7) delayed presentation of VS conditions; and (8) outcomes in patients with VS conditions.