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Division of Pulmonary, Critical Care and Sleep Medicine

Critical Care Medicine

Providing 24/7 critical care at Catskill Regional Medical Center. The Critical Care team focuses on point of care ultrasound and echocardiography and is a member of Catskill Regional's medical emergency response team.

Outpatient Pulmonary Care

Specializing in treatment for common diseases such as asthma, COPD, lung nodules, lung cancer, smoking cessation, sleep disorders, interstitial lung disease and pulmonary hypertension.

Inpatient Pulmonary Care

We provide treatment for pneumonia, acute exacerbations of chronic obstructive pulmonary disease (COPD), asthma, exacerbation, lung nodules/masses, sleep disorders and pleural effusions.

Sleep Medicine

We interpret sleep studies and treat patients with obstructive sleep apnea and insomnia.

Meet Our PCCSM Physicians

Our expert group of Board-certified physicians offer specialized diagnosis and treatment plans to our community for pulmonary care, critical care and sleep medicine. Meet our Physicians.

Dr. Kooragayalu (Koor) is a member  of Pulmonary, Critical Care and Sleep Medicine (PCCSM) teamShravan Kooragayalu (Koor), M.D., MBA
Medical Director of Pulmonary Critical Care
Dr. Kooragayalu (Koor) is a member of Pulmonary, Critical Care and Sleep Medicine (PCCSM) team. He holds ABIM Board-certification in Internal Medicine and Pulmonary and Critical Care Medicine.

Dr. Koor graduated Medical School from Bangalore Medical College affiliated with Rajiv Gandhi University, India. After completing his Medical School, he worked as a Research Assistant gaining experience in the field of Asthma and Allergy at Albert Einstein College of Medicine, Bronx, NY. Later, he did his training in Internal Medicine Residency at Montefiore Medical Center in Bronx, NY.

He further pursued his fellowship training in Pulmonary Critical Care Medicine from John.H Stroger Hospital of Cook County, Chicago, IL. Having additional interest in the ever changing Health Care System, he pursued a Masters in Management with a concentration in Health Care Administration as well as a Masters in Business Administration at Morris Graduate School of Management with Robert Morris University in Chicago, IL.

He worked at Bronx Care Hospital Center, where he served as an attending physician teaching and supervising Pulmonary-Critical Care fellows, Internal Medicine residents and Medical Students. He values and follows the philosophy, “To learn is to teach”. He has treasured working with fellows, residents and medical students throughout his training and career, where he has embraced different perspectives. He describes it as “My experience coupled with my patient care makes me humble, open minded, and curious”. He has a strong desire to make a positive difference on people around him. He is a skilled and motivated physician. With excellent communication and social skills, caring and compassionate personality, robust leadership attributes, he prefers to work in a challenging environment. He has keen interest in value based management and quality improvement work.

His areas of interests in Pulmonary medicine are Sarcoidosis, Tuberculosis, Interstitial Lung disease, Lung cancer screening and evaluation. He has multiple poster presentations and publications from national and international conferences. His areas of interest in Critical Care Medicine are ARDS, Critical Care Ultrasonography. Dr.Koor is a member of American College of Chest Physicians (ACCP) and American Thoracic Society (ATS).


Murali G. Krishna, M.D., FCCP of Orange Regional Medical GroupMurali G. Krishna, M.D., FCCP
Dr. Krishna is member of the Division of Pulmonary, Critical Care and Sleep Medicine (PCCSM) team and a Board-certified pulmonary-critical care physician. He also serves as Assistant Professor of Pulmonary and Critical Care Medicine at Touro College of Osteopathic Medicine in Middletown, NY.

Dr. Krishna holds Board certifications in Internal Medicine, Pulmonary Medicine and Critical Care Medicine. In addition, Dr. Krishna is a fellow of the American College of Chest Physicians (FCCP) and a member of American Thoracic Society (ATS) and Society of Critical Care Medicine (SCCM).

An author of multiple publications and two books, Dr. Krishna received his medical degree from Madras Medical College in Chennai, India and graduated from the Internal Medicine Residency program at the University of Texas Medical Branch in Galveston, TX. Additionally, he earned a Fellowship in Pulmonary and Critical Care from Albert Einstein College of Medicine, Montefiore Medical Center, Jacobi Medical Center and Jack D. Weiler Hospital in the Bronx, NY.


Aamir Gilani, M.D. of Orange Regional Medical GroupAamir Gilani, M.D. MPH FCCP
Dr. Gilani holds Board certifications in critical care, internal and pulmonary medicine and is board eligible in preventive medicine. He also serves as an adjunct assistant professor at Touro College of Osteopathic Medicine in Middletown, NY.

Dr. Gilani received his medical degree from the National University of Science and Technology in Rawalpindi, Pakistan. He worked as a Family Physician in rural communities in the beautiful valley of Kashmir before moving to the United States. He worked at the Pulmonary and Critical Care Department at Penn State Milton S. Hershey Medical Center as part of “Virtual Navigation Study” for patients with lung nodules. He then did his residency from Pinnacle Health System, Harrisburg, PA followed by Fellowship training in Pulmonary and Critical Care Medicine at Dartmouth Hitchcock Medical Center, Lebanon, NH. In addition to his fellowship, he did residency training in “Leadership Preventive Medicine” at Dartmouth as well. He holds a Masters in Public Health degree from The Dartmouth Institute. He was actively involved in public health projects with “Breathe New Hampshire” to improve care of Chronic Obstructive Pulmonary Disease Patients in the state of New Hampshire. He has lean six sigma training and has a keen interest in quality improvement work.

Dr. Gilani is a member of the American College of Chest Physicians (ACCP), American Thoracic Society (ATS), Society of Critical Care Medicine (SCCM) and American Association of Physician Leadership.


Samer El Zarif, M.D. of Orange Regional Medical GroupSamer El Zarif, M.D.
Dr. El Zarif holds Board certifications in internal, pulmonary, critical care and sleep medicine. He also serves as an adjunct assistant professor at Touro College of Osteopathic Medicine in Middletown, NY.

Dr. El Zarif earned a Bachelor of Science in Biology, at the American University of Beirut, before receiving his medical degree from the University of Balamand in Koura, Lebanon. He then moved to New York City and finished his Internal Medicine Residency at Staten Island University Hospital, where he was nominated for the Intern of the Year award. He then moved to Mobile, Alabama where he completed a Fellowship in Pulmonary and Critical Care medicine at the University of South Alabama, where he also served as a Chief Fellow during the last year of his training. After completing his fellowship, Dr. El Zarif was accepted for a Sleep Medicine Fellowship at the prestigious Cleveland Clinic in Cleveland Ohio, a world known referral center. During his training, he treated both adults and pediatric patients with complex sleep related medical disorders. His special interest is in the post-operative complications of sleep apnea, and he went on to present the results of his research orally at the SLEEP 2015 annual meeting of the Associated Professional Sleep Societies.

Dr. El Zarif is a member of the American College of Chest Physicians (ACCP), American Thoracic Society (ATS), American Academy of Sleep Medicine (AASM) and the Sleep Research Society (SRC).


Karthika R. Linga, M.D. of Orange Regional Medical GroupKarthika R. Linga, M.D.
Dr. Linga is the newest member of the Pulmonary critical care team. He holds ABIM certification in internal medicine, pulmonary medicine and critical care medicine.

Dr. Linga graduated medical school from Kasturba Medical College, Manipal university, India. He went on to complete his training in internal medicine at Akron General Medical Center- Cleveland Clinic foundation, OH with interest in teaching for which he received resident teacher of the year award for 2015. He also served as an instructor for training medical students at NEOCOM.

He then went on to train in pulmonary and critical care medicine at Mayo Clinic, FL and graduated in 2018. His interests range from COPD, asthma, cough to more challenging diseases like ILD and pulmonary hypertension and has multiple oral and poster presentations and publications. His critical care interests include use of ultrasonography and sepsis.

Dr. Linga is a member of American College of Chest Physicians (ACCP) and American Thoracic Society (ATS).


Advanced Practice Providers:

  • Jonathan Weiss, PA, team leader
  • Callie Schlosser, NP
  • Jennifer Selby, NP
  • Amanda Rand, PA

Contact Us

For more information or to schedule an appointment, contact our Pulmonary, Critical Care and Sleep Medicine department at one of our two locations:

Catskill Regional Medical Group
3rd Floor Ambulatory Service Building
68 Harris Bushville Road
Harris, NY 12742
845-794-3379

Orange Regional Medical Center
Outpatient Building
707 East Main Street
Middletown, NY 10940
845-333-7575