• Respiratory Mediine and Sleep Disorders
• Interventional   Pulmonology
• Critical Care Medicine.

• PSG Teaching Excellence Award 2019

• Chhabra S K, Sahay S, Ramaraju K. Allergic Bronchopulmonary Aspergillosis complicating childhood asthma. Indian J Pediatr. 2009 mar; 76 (3):331 – 2
• Ramaraju. K, Aggarwal B, Kulsrestha R, Chhabra S. Unusual Presentation of an uncommon lung malignancy. Lung India. 2008 Jul;25 (3): 132 – 4
• Karthikeyan Ramaraju, Srikanth Krishnamurthy, Smrithi Maamidi, Anupama Murthy Kaza, and Nithilavalli Balasubramaniam. Is serum cholesterol a risk factor for asthma? Lung India. 2013; 30(4): 295–301
• Ramaraju Karthikeyan, Srikanth Krishnamoorthy, Smrithi Maamidi, Anupama Murthy Kaza, Nithilavalli Balasubramanian. Effect of inhaled corticosteroids on systemic inflammation in asthma. Perspectives in clinical research 2014; Vol 5 (2): 75-79
• Anupama Murthy Kaza, Ramaraju Karthikeyan, Nithilavalli Balasubramaniam. Simulation based approach to improve competencies in respiratory emergencies among interns. International journal of innovative research and development 2015; Vol 4 (11): pp213 – 217
• Prashanth Ashok Kumar, R.Karthikeyan. A survey on the pattern of referral and management of patients with Tuberculosis by medical practitioners in an urban area. Journal of Patient Safety & Infection Control 2015; 3(2):49
• Ramaraju Karthikeyan, Anupama Murthy Kaza, Nithilavalli Balasubramaniam, Suddhuraj Chandrasekaran, Predicting healthcare utilization by patients admitted for COPD exacerbation. Journal of clinical and diagnostic research 2016; Vol 10(2):pp OC13 – OC17
• Prasanth Ashok Kumar, Ramaraju Karthikeyan and Anupama Murthy Kaza. Public private partnership for tuberculosis control in India: Are the private practitioner anywhere near to this RNDCP sponsored mission? IOSR Journal of dental and medical sciences 2016; Vol 15(4): PP 107-112
• Ramaraju Karthikeyan, Anupama K Murthy, Punitha Murugesan, Nithilavalli Balasubramaniam, Siddhuraj Chandrasekar. Is Serum Cholesterol A Risk Factor For Ischemic Heart Disease In Patients With Chronic Obstructive Pulmonary Disease? IOSR Journal of Dental and Medical Sciences 2016; Vol 15(3): PP 88-9
• Shweta Paulraj, Prasanth AK, Kavitha S Karthikeyan R. “Role of Oxidative Stress in COPD. Can we Use A Novel Biomarker To Measure It?” IOSR Journal of Dental and Medical Sciences 2017;16(9): 52-56
• Lekha T, Karthikeyan R. Multimodal imaging of choroidal tubercles. Indian J Ophthalmol 2018;66:995-6

Membership

• Fellow in American College of chest physicians (USA)
• Member in National college of chest physicians(India)
• Member in Indian college of Allergy Asthma & applied immunology
• Member in Coimbatore Respiratory Society