Dr. Rex L. Mahnensmith, M.D.
Adolescent Specialist | Adolescent Medicine
832 Queen Street Southington Connecticut, 06489About
I am continuing to serve as a Practicing Internal Medicine Physician. The central focus of my care is the individual. I aim to listen, to understand, to sort out the active concerns of each individual and to address each. I will actively address any expressed and discovered concern, and will make referrals as needed. My care aims to be proactive and preventative - to provide screening and advice and counsel regarding health maintenance and wellness achievement. My care also will address acute illnesses and established chronic ailments and health concerns. And my care shall embrace and address complex and high risk burdens of illness. My Calling as Physician is to provide -- and deliver -- personalized care that carefully considers the individual's burden of illnesses, the health changes that she or he is experiencing, and then aiming to carefully provide effective remediation. I am to actively consider special concerns and fears and needs as they unfold. It is with humility that I serve in this chapter of my Vocation -- truly taking time to listen, to hear, to respond, to show empathy, and to make deeply considered and personalized clinical decisions. I pledge to serve carefully and tenderly, expressing value, concerns, hopes, counsel and education to individuals as I deliver particulars of clinical care.
I am blessed with good health myself. I have served for over 30 years as Teaching Physician in three University Medical Centers. My teaching harmonized well with my clinical service and patient care during these years. I served both in outpatient clinics and on hospital units, supervising students and residents in concert with direct care responsibilities. These years were fulfilling. I aimed to deliver best care to patients - and I aimed to model best care as well. I regularly talked to students and residents about the special "Calling" of a physician - the privilege, the responsibilities, the duties, and the opportunities to make a difference to individuals and families. I received several teaching awards over these years, and I received several "Model Physician Awards" as well. These years were filled with gratification and positive relationships. I thoroughly enjoyed clinical teaching and I poured my heart and mind and soul into each moment. I served as Associate and then Full Professor of Medicine at Yale Medical School from 1992 to 2014. During these years, I also served as "Clinical Advisor" to the Chairman of Medicine and I serve as "Advisor" to National Medicare Dialysis Oversight Committee. I also served as Medical Director of Dialysis at Yale from 1994 to 2014 and as Regional Medical Director of Dialysis for two National Dialysis Corporations from 2001 through 2006. In these Medical Director of Dialysis Roles, I was responsible for Quality Assurance and Dialysis Safety in local dialysis clinics in New Haven, CT and I also served as a Regional Educator regarding Quality Assurance for hundreds of dialysis clinic leaders across 30 states in Eastern U.S. In this capacity, I lead the development of several Clinical Pathways which were implemented within the operations of these dialysis clinics and which resulted in high quality care and excellent clinical outcomes.
In 2014, I retired from Yale University Professorship as Tenured Professor Emeritus - - and I transitioned to serving individuals and families in Skilled Nursing Facilities, providing General Medical care to many persons with various chronic illnesses. In this context, I had the capacity to really take time with individuals --- to sit and listen, to hear and to understand their concerns, and to deliver personalized care like never before. In this, I realized my Deepest Calling as a Physician -- primary, holistic care of individuals in their own special contexts, delving deeply into their unique social contexts, knowing deeply their burdens of chronic illnesses, responding promptly to any acute health change that they were experiencing, and addressing their various problems and fears. I took this step in my career journey so that my wife and I could live in a small town in northern Connecticut where our daughter and our grandchildren lived, so that we could help with their care and familly needs. This step was very positive.
In 2015, I transitioned to a Community Health Clinic setting, where I served as Primary Care Physician addressing multiple individuals' needs and concerns. It is with humility that I served in this chapter of my "Vocation" -- truly taking time to listen, to hear, to speak, to show empathy, and to make deeply considered, and personalized clinical decisions - and aiming to catalyze positive change in each person's health and sense of well-being. I served as Chief Medical Officer for the CHC into 2017, then transitioned to a Private Practice Group - DOCS of Connecticut.
Through all, I have truly hoped to be a light that shines, just enough to give warmth and illumination and to be a kindling source for others' whose light is dimming or flickering. I have hoped and continue to hope to confer a true sense of genuine caring to each person that I serve - - caring for the person but also caring about the person -- recognizing and serving within their specific social context.
Serving in this way, serving carefully as a caring physician, has been and is my Calling. I intend to serve thusly as long as God wills and by His Strength and Wisdom.
Professional Honors and Recognition:
Apr 1972 Phi Beta Kappa, Sigma Xi, Omicron Delta Kappa, Denison University
Sep 1972 Teaching Fellow, Denison University
Jun 1976 Lange Award: "Clinical Excellence". Yale
May 1977 Alpha Omega Alpha, Yale
Jun 1977 Berniker Award: "Most exemplary of The Oath of Hippocrates and Maimonides Prayer" Yale
Jun 1979 Kushlan Award: "For clinical excellence and contributing the most to patient care" Yale
Jul 1983 National Kidney Foundation, Research Fellowship Award, Yale
Jun 1985 Duke University "Special Recognition for Teaching"
Jun 1988 "Teacher of the Year" Brown University
Jun 1988 "Model Physician Award" Brown University
Jun 1989 "Senior Class Outstanding Teacher Award" Brown University
Jun 1989 "Teacher of the Year", Miriam Hospital, Brown University
Jun 1990 "Model Physician Award", Miriam Hospital, Brown University
Jun 1990 "1990 Senior Citation: Outstanding Physician and Teacher" Brown University
Jun 1991 "Senior Class Outstanding Teacher Award", Brown University
Jun 1991 "Model Physician Award", Miriam Hospital, Brown University
Jun 1992 "Teacher of the Year", Miriam Hospital, Brown University
Jun 1993 "Teacher of the Year", Yale Internal Medicine
Jun 1993 "Howard M. Spiro Teaching Award", Yale University Affiliated Hospitals
Sep 1997 "Didactic Professor Award", Yale University Physician Associate Program
Sep 2009 "Didactic Professor Award", Yale University Physician Associate Program
Jun 2011 "Emergency Medicine Resident Appreciation Award", Yale Emergency Medicine
Oct 2012 "DaVita Shining Star Award" -- for service excellence in their dialysis clinics
Sep 2013 "Branford-DaVita Service Appreciation Award"
Dr. Rex L. Mahnensmith, M.D.'s Videos
Education and Training
MD at Yale School of Medicine
Yale New Haven Hospital Internal Medicine Residency 1980
Yale University Fellowship Nephrology Metabolism 1984
Board Certification
American Board of Internal Medicine
Nephrology (Internal Medicine)
Provider Details
Dr. Rex L. Mahnensmith, M.D.'s Expert Contributions
Knowing All About Sugar: Blood Vessel and Tissue Injuries Develop When Blood Glucose Concentrations Circulate Above Normal Even For A Short Time: Part 2 of the Diabetic Story
Glucose is the essential energy molecule that our body's tissues utilize. Glucose exists in fruits and vegetables and grains, either as a simple sugar or as a structural component of plant starches and complex fiber carbohydrates. All carbohydrates must be broken down to glucose and fructose in our...
Knowing All About Sugar: Essential for Life but Potentially Unhealthy: Part 1 of the Diabetic Story
Sugar is the familiar and common name for sucrose, a naturally occurring substance in nature that is formed in plants from the combination of water absorbed from soil and carbon dioxide absorbed from the air. Yes, sugar is composed simply of water and carbon dioxide. Sucrose is a complex sugar...
Vitamin K2: A Little Known Vitamin That We Now Know Reverses and Prevents Artery Calcification and Promotes Bone Matrix Calcification
A “vitamin” is a nutrient essential for life. We are well-acquainted with most vitamins, such as vitamin A, the B-vitamins, and vitamins C, D, and E. Each has a well-known and essential role in support of vital tissue functions, and each must be ingested from particular food sources, with the...
Why Delve Deeply into Our Daily Nutrition? Because we Become what we Eat!
Our daily food and beverage intake may be a matter of deep thought and careful selection. Or, our daily food and beverage intake may be a matter simply of convenience, routine, habit, and taste. What has become clear from many years of impressive scientific research is that daily nutrient flows...
What are the key risk factors for COPD?
Chronic obstructive pulmonary disease evolves from inhaled irritants. The irritants provoke bronchial mucus secretion and bronchial cellular thickening. Then chronic bronchitis becomes established with tightness and narrowing of pulmonary bronchi and branch bronchioles. Inhaled airflow is thereby constricted. Air trapping may occur in alveoli. The common irritants are tobacco smoke, factory fumes and dust, coal mine dust, and mold allergens. Exposure and inhalation over extended periods of time are variables. And an individual’s response will vary from person to person depending upon intensity and repetition. READ MORE
How long can a person live with Alzheimer's?
This is quite variable. The time can be years and years and years. Many years possible. Support matters. In-person support. Nutrition support. Vitamin support. Brain nutrient support. Rest and activity support. Safety assurances. Help and helpers. Safe home. Safe living. Clinical specialist support with specific medications help. Talking. Music. Walking. All help. READ MORE
GERD/cancer?
Your symptoms and questions and concerns indicate a definite need for additional testing. Gastric irritation that is sufficient to cause ongoing heartburn and epigastric upset and pain itself indicates inflammation within the lining of your stomach and likely your lower esophagus. The root cause is gastric acid. Gastric acid secretion is essential for food digestion. Yet it can cause erosion in the stomach lining. The resulting gastritis may be superficial or deeper and creating ulcers. Ulcers require remediation which includes diet changes and acid reduction. Then of extreme importance, chronic gastritis is often associated with gastric mucosal infection with Helicobacter pylori. Helicobacter pylori bacteria are common. Their presence perpetrates and perpetuates ulcerative erosions and gastritis. And ongoing infection leads to cancer changes in the stomach lining. The presence of Helicobacter can be detected by endoscopy and by specific breath testing at a special laboratory. A biopsy is very good at detection. If present double antibiotic plus omeprazole twice daily for 10-14 days is essential with follow-up retests. And chronic acid reflux into the esophagus can lead to ulcer formation in the lower esophagus and this too can become cancerous. So specialist testing is essential. READ MORE
Repetitive abscess?
The likely consequence of the rupture and repair surgery are some internal adhesions and small spaces of scar tissue surrounding small spaces. The tissue may have some ongoing breakdown over time. And spleen loss renders a person prone to infection. READ MORE
Managing my conditions?
It does take longer than one week for sinus infections and inflammation and ear infections and inflammation to resolve. An antihistamine tablet daily and corticosteroid nasal spray daily. READ MORE
Should I be worried about endocarditis?
Request an order for blood cultures. READ MORE
Can 4 years old take multivitamins?
Yes. The canister will say Children's. READ MORE
How do you treat nail fungus in children?
Clotrimazole topical cream works well for children’s toe fungus applied twice daily for four weeks. Approved for children over 3 years old. Topical Vicks Vapo Rub helps eliminate toenail fungus also applied each night. READ MORE
Please help me interpret my AST and ALT lab results?
Yes. The liver enzyme elevations are mild and reversible. A liver ultrasound is warranted to assess the texture of the liver. One consideration is alcohol-induced liver enzyme elevation. A second consideration is fatty liver from carbohydrate and fatty acid storage. Both are reversible. A liver biopsy is not essential. A hematologist can provide expert advice. READ MORE
CKD and taking Omeprazle?
Your concern is reasonable. Omeprazole can cause kidney injury as allergic interstitial nephritis. It is a common cause of allergic interstitial nephritis worldwide. It is appropriate to substitute famodipine. READ MORE
Do zinc pills increase sperm count?
Several factors and variables influence sperm counts. Zinc is important for prostate health and testicular health but all factors need to be adjusted and remedied. READ MORE
How can I prevent a stroke?
Good question. Maintain healthy body weight. Maintain normal blood pressure. Maintain normal glucose. Maintain normal cholesterol and triglycerides. Exercise regularly. Avoid sugar intake and animal fats. Take omega three and astaxanthin. Take Polyphenol powders daily. Take magnesium supplements daily. READ MORE
What is the best medication for colitis?
Colitis responds to corticosteroids and other immune suppressant medications. Each requires expert advice and dosing and monitoring. Diet adjustments are essential too. Probiotics are essential too. READ MORE
What happens when your diagnosed with more than one liver problem?
Liver inflammation with hepatitis A resolves. Liver inflammation from NASH most often resolves after diet changes of glucose and fructose restrictions and fat restrictions and total calorie restrictions and 15 percent weight loss. READ MORE
What can I do if I overdosed with pills?
Go to the emergency room. READ MORE
Possible autoimmune disease?
Yes. Autoimmune disease is a warranted consideration. In addition, hypersensitivity to environmental allergens is also a warranted consideration. Allergy skin prick testing is warranted and blood testing for environmental and food allergies is warranted. READ MORE
Please help I'm very ill?
Yes, you are enduring symptoms and signs of illness. Uncovering the basic root causes is essential. This requires specific exams and testing. And the exams and tests will either rule out specific illnesses or will identify a specific illness and causative ailment. READ MORE
Abdominal pain?
Aches and pain in that location is most often small bowel source. In some persons, appendix pain shows up first in the periumbilical zone and then localizes to the right lower abdominal quadrant. Simply your diet for 3-5 days. Mostly fluids. Keep watch over symptoms and location. READ MORE
Severe tension headache?
Yes, you describe a severe tension headache. At times it will help to massage and massage as you have. Relaxing tea is helpful. A Neck massage is helpful. A warm pad on your neck is helpful. A warm bath is helpful. Minimizing brightness and computer screen is helpful. READ MORE
Belly button discharge following appendix surgery?
Infection present. The smell indicates anaerobes and abscess location. Urgent evaluation is essential with culture and antibiotic and analysis of depth. READ MORE
Expert Publications
Data provided by the National Library of Medicine- Pericarditis associated with renal failure: evolution and management.
- Hypercalcemia, hypernatremia, and reversible renal insufficiency.
- A quality improvement model for optimizing care of the diabetic end-stage renal
- Advances in nephrology: a selected review of progress in care of the patient with renal failure.
- Urgent-start peritoneal dialysis: what are the problems and their solutions?
- Novel treatments of autosomal dominant polycystic kidney disease.
- Diabetic nephropathy: a comprehensive approach.
- A middle-aged woman with back and flank pain.
- Angiotensin-converting enzyme inhibitor therapy in chronic hemodialysis patients:
- Trimethoprim-sulfamethoxazole: hyperkalemia is an important complication regardless of dose.
- Dysuria in an elderly man with cardiomyopathy.
- Bone marrow transplant nephropathy: a case report and review of the literature.
- Hyperkalemia in the elderly: drugs exacerbate impaired potassium homeostasis.
- Images in clinical medicine. Malignant hypertension.
Areas of expertise and specialization
Faculty Titles & Positions
- Professor, Duke University, Brown University, Yale University -
Awards
- Teacher of the Year.Brown Univ.1988, '89, '90, '91, '92
- Outstanding Teacher. Yale Univ. 1993, '97, 2009, 2011
- Model Physician. Miriam Hosp. 1988, '90, '91
- Dialysis Medical Director Excellence. 2011, 2013
- Outstanding Teacher. Duke U. 1985
- Leading Physicians of the World 2016 International Association of Health Care Practitioners
- Berniker Award - Most Exemplary of Prayer of Maimonides 1977 Yale U
- Kushlan Award - Best Bedside Manner and Care 1978 Yale NH Hospital
- Chief Resident 1980 Yale U Dept of Medicine
- Who's Who Honorary 2017 Continental Who's Who
- Marquis Who's Who 2022 Marquis Who's Who
- Patient Preferred Award 2021 Patient Preferred Physicians
Professional Memberships
- American Medical Association
- American Society of Nephrology
Charities and Philanthropic Endeavors
- Compassion International Aid Society
- Send International Missions
- CRU Campus Missions
- Ligonier Ministries
- HAVEN
- ASPCA
- Christ Community Church in Collinsville
- Samaritans' Purse
- World Vision
Internships
- Yale New Haven Hospital Internal Medicine
Fellowships
- Yale University Nephology
Professional Society Memberships
- AMA and ASN
Favorite professional publications
- JAMA
Areas of research
Nutritional Care of the Person with Chronic Kidney Disease
Optimizing Diabetic Control
Nutritional Care of Polycystic Kidney Condition.
Pharmacologic Care of Polycystic Kidney Condition.
Impact of Clinical Pathways on Promoting Quality Improvement in Clinic Settings
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