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Dive into the research topics where Imran Niazi is active.

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Featured researches published by Imran Niazi.


Pacing and Clinical Electrophysiology | 2014

Cardiac Resynchronization Therapy in Patients with Challenging Anatomy Due to Venous Anomalies or Adult Congenital Heart Disease

Imran Niazi; Anwer Dhala; Indrajit Choudhuri; Jasbir Sra; Masood Akhtar; Abdul Jamil Tajik

Cardiac resynchronization therapy (CRT) has proven salutary effects in patients with congestive heart failure, systolic dysfunction, and electromechanical dyssynchrony in the setting of ischemic, nonischemic, and congenital cardiomyopathy. While CRT device implants have become routine in the adult ischemic or nonischemic cardiomyopathy populations, patients with congenital heart disease offer special challenges due to unusual anatomic variations.


Pacing and Clinical Electrophysiology | 2015

Three-Dimensional Cardiac Mapping Characterizes Ventricular Contractile Patterns during Cardiac Resynchronization Therapy Implant: A Feasibility Study

Imran Niazi; Johannes Sperzel; Edwin Kevin Heist; Stuart Rosenberg; Kyungmoo Ryu; Michael Yang; Andre d'Avila; Jagmeet P. Singh

Electroanatomic mapping systems track the position of electrodes in the heart. We assessed the feasibility of characterizing left ventricular (LV) performance during cardiac resynchronization therapy (CRT) implant utilizing an electroanatomic mapping system to track the motion of CRT lead electrodes, thus deriving ventricular contractility surrogates.


Pacing and Clinical Electrophysiology | 2014

Clinical feasibility of exercise-based A-V interval optimization for cardiac resynchronization: a pilot study.

Indrajit Choudhuri; Dean MacCarter; Rachael Shaw; Steve Anderson; John A. St. Cyr; Imran Niazi

One‐third of eligible patients fail to respond to cardiac resynchronization therapy (CRT). Current methods to “optimize” the atrio‐ventricular (A‐V) interval are performed at rest, which may limit its efficacy during daily activities. We hypothesized that low‐intensity cardiopulmonary exercise testing (CPX) could identify the most favorable physiologic combination of specific gas exchange parameters reflecting pulmonary blood flow or cardiac output, stroke volume, and left atrial pressure to guide determination of the optimal A‐V interval.


Pacing and Clinical Electrophysiology | 2013

Left Ventricular Pacing in Right Ventricular Cardiomyopathy: Blessing or Blunder?

Imran Niazi; Neil Rennick; Jo Ann Kiemen; Jasbir Sra

Arrhythmogenic right ventricular dysplasia (ARVD) predominantly involves the right ventricle, and myocardium is progressively replaced by fat and fibrous tissue in the apex, base, and outflow tract regions. This pathology, and the progressive nature of the disease, poses special challenges for implant and subsequent appropriate functioning of an implantable cardioverter‐defibrillator. This case report describes a solution to problems during lead placement in patients with ARVD.


Heart Rhythm | 2012

Unroofed coronary sinus or coronary sinus on the roof? Successful implantation of biventricular implantable defibrillator in anomalous coronary venous drainage

Atul Bhatia; Imran Niazi; Mohamed S Rahman; Jasbir Sra

w b p t l c t s t Unfavorable coronary sinus (CS) anatomy remains an impediment to placing the left ventricular (LV) lead for cardiac resynchronization. We successfully implanted a biventricular defibrillator in a patient with unique anomalous coronary venous drainage, not described to date. A 51-year-old man with dilated nonischemic cardiomyopathy, left bundle branch block (QRS duration 160 ms), LV dysfunction (ejection fraction 20%), and chronic systolic heart failure (NYHA Class III) underwent biventricular defibrillator implantation. After transvenous CS cannulation, angiography performed in the 30° left anterior oblique (LAO) view suggested atresia of CS in the posteroinferior portion of the right atrium (RA) with a large anomalous venous connection filling retrogradely and draining into the RA roof just posterior to and leftward of the superior vena cava/RA junction (Figure 1A). Selective cannulation of this anomalous ostium in the RA roof was achieved with a 6F steerable decapolar catheter (Biosense Webster Inc., Diamond Bar, CA, USA). Angiography (28° LAO projection) performed through the guiding sheath at this site revealed a venous tributary draining the posterolateral LV wall. An LV lead (Medtronic Inc., Minneapolis, MN, USA) was successfully placed in the targeted posterolateral venous branch (Figure 1B, arrows) with good pacing parameters and withut any evidence of phrenic nerve stimulation. The course f the lead is shown on chest X-ray film (Figure 1C, arows). Axial slice from three-dimensional (3D) spiral comuted tomography (Figure 1D) showed the course of the LV


Journal of Interventional Cardiac Electrophysiology | 2014

Three-dimensional electroanatomic mapping of the coronary veins during cardiac resynchronization therapy implant: feasibility and possible applications

Imran Niazi; Kyungmoo Ryu; Richard Hood; Indrajit Choudhuri; Masood Akhtar


Europace | 2016

176-77: High incidence of hyper-response to optimized dual site left ventricular cardiac resychronization therapy

Imran Niazi; Christopher Hayes; Rebecca Dahme


Circulation | 2013

Abstract 9400: Obesity is Associated With Lower Mortality in Patients With Implantable Cardioverter-Defibrillator

Mahek Mirza; Beeletsega Yeneneh; Chi Cho; Indrajit Choudhuri; M. Eyman Mortada; Vikram Nangia; Atul Bhatia; Imran Niazi; Jasbir Sra; Arshad Jahangir


Journal of Cardiac Failure | 2012

Can Anodal Pacing Be Utilized To Reduce Energy Requirements during Cardiac Resynchronization Therapy

Imran Niazi; Kyungmoo Ryu; Rebecca Dahme; Indrajit Choudhuri; Arshad Jahangir; Masood Akhtar; Jasbir Sra


Journal of Cardiac Failure | 2012

Are Unipolar Pacing Thresholds Lower Than Bipolar Pacing Thresholds in Multipolar Left Ventricular Leads

Imran Niazi; Gery Tomassoni; James H. Baker; Raffaele Corbisiero; Charles Love; David Martin; Robert Sheppard; Seth J. Worley; Nicole Harbert

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Indrajit Choudhuri

University of Wisconsin-Madison

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Jasbir Sra

University of Wisconsin-Madison

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Atul Bhatia

University of Wisconsin-Madison

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Masood Akhtar

University of Wisconsin-Madison

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Anwer Dhala

University of Wisconsin-Madison

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Arshad Jahangir

University of Wisconsin-Madison

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Christopher Hayes

University of Wisconsin-Madison

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M. Eyman Mortada

University of Wisconsin-Madison

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