A novel stent was designed for the treatment of coronary bifurcation lesion, and it was investigated for its performance by finite element analysis. This study was performed in search of a novel method of treatment of bifurcation lesion with provisional stenting. A bifurcation model was created with the proximal vessel of 3.2 mm diameter, and the distal vessel after the side branch (2.3 mm) was 2.7 mm. A novel stent was designed with connection links that had a profile of a tram. Laser cutting and shape setting of the stent was performed, and thereafter it was crimped and deployed over a balloon. The contact pressure, stresses on the arterial wall, stresses on the stent, the maximal principal log strain of the main artery and the side-branch were studied. The study was performed in Abaqus, Simulia. The stresses on the main branch and the distal branch were minimally increased after deployment of this novel stent. The side branch was preserved, and the stresses on the side branch were lesser; and at the confluence of bifurcation on either side of the side branch origin the von-Mises stress was marginally increased. The stresses and strain at the bifurcation were significantly lesser than the stresses and strain of the currently existing techniques used in the treatment of bifurcation lesions though the study was primarily focused only on the utility of the new technology. There is a potential for a novel Tram-stent method in the treatment of coronary bifurcation lesions.

Aims and objectives: The pandemic of COVID-19 is evolving worldwide, and it is associated with high mortality and morbidity. There is a growing need to discuss the elements of a coordinated strategy to control the spread and mitigate the severity of COVID-19. H1N1 and Streptococcus pneumonia vaccines are available. The current analysis was performed to analyze the severity of COVID-19 and influenza (H1N1) vaccination in adults ≥ 65. Also, to correlate the lower respiratory tract infections (LRIs), and influenza attributable to the lower respiratory tract infections' incidence with Covid-19 mortality. Evolutionarily influenza is close in resemblance to SARS-CoV-2 viruses and shares some common epitopes and mechanisms. Methods: Recent influenza vaccination data of 34 countries from OECD and other publications were correlated with COVID-19 mortality from worldometer data. LRIs attributable to influenza and streptococcus pneumonia were correlated with COVID-19 mortality. Specifically, influenza-attributable LRI incidence data of various countries (n = 182) was correlated with COVID-19 death by linear regression and receiver operating characteristic (ROC) curve analyzes. In a logistic regression model, population density and influenza LRI incidence were correlated with COVID-19 mortality. Results: There is a correlation between COVID-19-related mortality, morbidity, and case incidence and the status of influenza vaccination, which appears protective. The tendency of correlation is increasingly highlighted as the pandemic is evolving. In countries where influenza immunization is less common, there is a correlation between LRIs and influenza attributable to LRI incidence and COVID-19 severity, which is beneficial. ROC curve showed an area under the curve of 0.86 (CI 0.78 to 0.944, P < 0.0001) to predict COVID-19 mortality >150/million and a decreasing trend of influenza LRI episodes. To predict COVID-19 mortality of >200/million population, the odds ratio for influenza incidence/100,000 was −1.86 (CI −2.75 to −0.96, P < 0.0001). To predict the parameter Covid-19 mortality/influenza LRI episodes * 1000>1000, the influenza parameter had an odd's ratio of −3.83 (CI −5.98 to −1.67), and an AUC of 0.94. Arokiaraj Influenza Reduces COVID-19 Severity Conclusion: Influenza (H1N1) vaccination can be used as an interim measure to mitigate the severity of COVID-19 in the general population. In appropriate highrisk circumstances, Streptococcus pneumonia vaccination would also be an adjunct strategy, especially in countries with a lower incidence of LRIs.

Angioplasty with stenting can be performed safely through 6F Cordis infiniti diagnostic catheters when difficulty in engaging guide catheters is encountered.

A novel large self-expanding endovascular stent was designed with strut thickness of 70 μm × 70 μm width. The method was developed and investigated to identify a novel simpler technique in aortic aneurysm therapy. Stage 1 analysis was performed after deploying it in a virtual aneurysm model of 6 cm wide × 6 cm long fusiform hyper-elastic anisotropic design. At cell width of 9 mm, there was no buckling or migration of the stent at 180 Hg. Radial force of the stents was estimated after parametric variations. In stage 2 analysis, a prototype 300 μm × 150 μm stent with a cell width of 9 mm was chosen, and it was evaluated similarly after embedding in the aortic wall, and also with a tissue overgrowth of 1 mm over the stent. The 300/150 μm stent reduced the peak wall stress by 70% in the aneurysm and 50% reduction in compliance after embedding. Stage 3 analysis was performed to study the efficacy of stents with struts (thickness/width) 70/70, 180/100 and 300/150 μm after embedding and tissue overgrowth. The adjacent wall stresses were very minimal in stents with 180/100 and 70/70 μm struts after embedding. There is potential for a novel stent method in aortic aneurysm therapy.

Four patients with extensive acute iliofemoral and popliteal vein thrombosis and partially extending into the inferior venacava (IVC) with diffuse swelling of lower limb and gluteal region were studied. Initially, Gunther Tulip (Cook) IVC filter was placed in all patients. A 5F multipurpose catheter with side holes was placed in common iliac vein bifurcation and thrombolysis was done for 18 hours with diluted streptokinase infusion at 50,000 U/hr. Thereafter, a 5 mm × 4 cm peripheral balloon was advanced through the clots to mid or lower femoral vein level and thrombolysis was done for 18 hours with streptokinase infusion through the balloon's 035 wire port. The balloon was pulled back and multiple serial dilatations were done in all four procedures. Post procedure the venous channels were opened and were draining adequately. Limb edema subsided in 4 to 5 days and there were no bleeding or embolic complications in all patients. The first two patients are on follow up for 18 months, the third patient for 5 months, and the fourth patient for 2 weeks. Based on these observations, two novel balloon models for thrombolysis and to perform venous angioplasty simultaneously were developed. The piggyback model has a side lumen catheter with side holes attached to the shaft of the balloon catheter (5 mm width × 4 cm length ). The side lumen terminates before the balloon. The horseshoe models made of polyethylene terephthalate have a 10 cm long and 4 mm wide compliant balloon with a double lumen catheter and multiple side ports till the balloon tip. Gunther Tulip (Cook) IVC filter was placed in all patients, initially after performing an IVC angiogram. A 5F multipurpose catheter with side holes was placed in common iliac vein bifurcation, and thrombolysis was done for 18 hours with streptokinase at 50,000 U/ hr. Post thrombolysis IVC angiogram showed mild recanalization of left common iliac veins leaving a stump. On the next day, the left common iliac vein was cannulated through a 5F Torcon or 5F right Judkins catheter and a hydrophilic Terumo 035 J tipped wire was advanced through the clots. A 5 mm wide × 4 cm long peripheral balloon was advanced through the clots, and 18-hour thrombolysis with streptokinase was done at 50,000 U/hr through the port for 035 wire. The balloon was pulled back, and multiple serial dilatations were done in femoral, internal iliac and common iliac veins. In all patients, thrombolysis was started on the third day after the onset of symptoms. Venous angiograms were done through the balloons during the procedure. Figures 1 and 2 illustrate the procedures in a nutshell (Supplementary Video file). Simultaneous Thrombolysis and Venous Angioplasty inPost-procedure the patients were started on anticoagulation and therapeutic INR was maintained between 2 to 3. Echocardiography, chestroentogram, electrocardiography and venous Doppler of the common iliac veins, femoral veins and IVC were done. All patients were discharged on the 7 th day.