Publications by authors named "Asaad Khan"

Takotsubo Cardiomyopathy is an established transient cardiomyopathy found predominately in females with intense emotional and physical strain. It has four notable variants: Apical, Mid-Ventricular, Basal and Focal. Mid Ventricular variant is also referred to as Reverse Takotsubo Cardiomyopathy.

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The aim of this report is to explore the direct and long-term outcome in a high risk patient who was treated with rotational atherectomy (RA) to assist the placement of drug eluting stents in heavily calcified lesions. The patient presented with acute STEMI and had severely calcified Left main stem (LMS) disease, requiring plaque modification before coronary angioplasty and stent implantation. As the patient was elderly, with multiple comorbids including a number of coronary interventions, a decision of conservative management was made.

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New persistent left bundle branch block (NP-LBBB) has been associated with adverse outcomes after TAVI but few predictors thus far reported. We sought to identify predictors of NP-LBBB after TAVI with EvolutR/PRO (ER/EP). From 1/2016 to 4/2019, 544 patients from 2 centers underwent TAVI with Evolut (54% ER, 46% EP) for severe native aortic stenosis.

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Backgrounds/aims: Pancreatic leak and fistula formation following pancreatic resection is a dreaded complication associated with significant morbidity and mortality. The perioperative use of inotropes has been implicated in anastomotic dehiscence in other types of gastrointestinal surgery but their impact in pancreatic surgery remains unclear and a potentially modifiable risk factor for pancreatic leak. This study aims to assess the impact of perioperative inotrope infusion on the incidence of pancreatic leak following pancreaticoduodenectomy.

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Retroperitoneal hemorrhage (RPH) and other femoral artery access site complications are associated with "high" arterial punctures. Using the nadir of inferior epigastric artery (IEA) as the landmark for identifying the inguinal ligament and high punctures can reduce access site complications. Traditional teaching of aiming for the middle of the femoral head while obtaining femoral access can result in higher than desired puncture site more frequently than aiming for the lower quarter.

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Repeat surgery is the ideal choice for degenerated bioprosthetic mitral valves. Percutaneous valve-in-valve (ViV) replacement for the treatment of degenerated bioprostheses has emerged as an alternative to open surgery in patients who are at high risk of surgical complications. Joseph et al have described the feasibility and long-term outcomes of Melody ViV Implantation for bioprosthetic mitral valve dysfunction in high-risk population.

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The anatomic interplay between aortic valve, ascending aorta, left ventricular outflow tract and peripheral vasculature play a major role in determining device related outcomes in transcatheter aortic valve replacement. Factors such as the alignment angle (prosthesis-ascending aorta), pre-dilatation, operating team experience and chronic kidney disease may play a role in valve displacement. Careful analysis of all imaging modalities while sizing and selecting a valve type, and attention to newer deployment techniques may improve outcomes.

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Use of bioprosthetic implants for surgical aortic valve replacements (SAVR) has been increasing in the recent years Surgical redo AVRs for failed surgical aortic bioprostheses have been traditionally considered the standard practice; however, in patients with higher surgical risk scores, transcatheter valve-in-valve aortic valve replacements are being commonly performed There is scarcity of data comparing these two approaches in this complex patient cohort Available data suggest that transcatheter ViV aortic valve replacement is generally a safe approach once some caveats are accounted for.

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Objectives: We report our multicenter experience on continuous hemodynamic monitoring using exclusively the steerable guide catheter (SGC) during MitraClip repair.

Background: Left atrial pressure (LAP) and V-wave are useful to evaluate MitraClip repair but no simple method of continuous monitoring exists.

Methods: From 11/2016 to 8/2017, 74 patients from four centers with symptomatic moderate-severe to severe mitral regurgitation (MR), underwent MitraClip NT repair with continuous hemodynamic monitoring via the SGC.

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Objective: The prevalence of heart failure (HF) among adult patients with congenital heart disease (ACHD) is rising. Right ventricle (RV) exercise reserve and its relationship to outcomes have not been characterised. We aim to evaluate the prognostic impact of impaired RV reserve in an ACHD population referred for cardiopulmonary exercise testing (CPET).

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The results of overlapping metallic stents have been concerning but this practice is often unavoidable in the setting of long or tortuous lesions, diameter discrepancy of proximal and distal vessel, and for residual dissections. Theoretically, bio-absorbable scaffolds may carry an advantage over metallic stents due to the progressive resorption of the scaffold theoretically rendering the overlap a non-issue; this has not been clinically evident. Since stent/scaffold overlap cannot be entirely avoided, improved stent delivery/deployment and scaffold design modification may reduce complications in this complex patient subset.

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The quest for a "diabetic" stent.

Catheter Cardiovasc Interv

April 2018

Patients with diabetes mellitus and extensive coronary artery disease generally had worse outcomes with early generation drug eluting stents (DES) as compared to coronary artery bypass grafting. Initial results with Amphilimus eluting coronary stent in patients with diabetes have been promising in small studies The data from Sardella et al. should be used, in conjunction with previous clinical studies with this DES type, as hypothesis generating for a large multicenter randomized trial to aid in our quest to find the "new diabetic stent.

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Several chronic total occlusions (CTOs) may be undilatable despite successful wire passage; several techniques can be used for lesion preparation, such as high-pressure balloon inflations, rotational atherectomy laser, cutting balloon, and scoring balloons. Presence of moderate to severe calcification and lesion length over 40 mm in association with comorbidities, such as diabetes mellitus and reduced ejection fraction, may contribute to making a CTO lesion undilatable. Still, appropriate therapy selection for a patient with CTO should be individualized and procedure safety attended to.

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Cardiac Imaging In Athletes.

Methodist Debakey Cardiovasc J

May 2017

Article Synopsis
  • Athletic heart syndrome is a condition where the heart undergoes healthy changes due to intense and repetitive exercise, leading to larger heart cavities, increased cardiac output, and increased muscle mass.
  • These adaptations are specific to the type of sport and are influenced by the differences in endurance and strength training.
  • It's important to differentiate athletic heart syndrome from serious heart conditions like hypertrophic cardiomyopathy, as the typical abnormalities seen in athletes usually return to normal after they stop training.
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Flash pulmonary edema is characteristically sudden in onset with rapid resolution once appropriate therapy has been instituted (Messerli et al., 2011). Acute increase of left ventricular (LV) end diastolic pressure is the usual cause of sudden decompensated cardiac failure in this patient population.

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