How Diabetes Affects Your Heart Health

India is home to more than 77 million people with diabetes, the highest absolute number of diabetes patients in the world. Most of them are aware of their blood sugar levels. Not many of them realize that poorly managed diabetes is not a cause of blindness, not a cause of kidney failure, and not a cause of losing a limb (although it can be). It's a heart disease. The study, published in PMC, showed that 66 per cent of diabetics had cardiac complications; of this group, around a third had coronary artery disease, one-third had diabetic heart disease (cardiomyopathy) and one-third had diastolic dysfunction. These are not uncommon results. They're the average of poorly controlled diabetes and cardiovascular disease. The only question is whether or not your heart is at risk if you have diabetes. It is the amount of risk that has already been incurred and what is still subject to change. India specific risk is higher than the average global risk. Diabetes contributes to 30-39% of all patients with CHD in India while in international registries, the proportion is 15-21%. Diabetes heart disease strikes South Asians at earlier ages, at normal weight and with little warning. The ICMR-INDIAB 2025 study revealed that a large number of normal-weight adult Indians already had risk factors for cardiovascular disease such as high waist circumference, high blood pressure, or high fasting glucose levels  all of which were sub-clinical.

Three Pathways How High Blood Sugar Damages the Heart

It's more than just a connection; diabetes is a direct risk factor for heart problems. It functions via well-established and understood biological pathways, which start well before symptoms are seen.

The concept of atherosclerosis, or the problem with the plaque is introduced.Introduction to Atherosclerosis  The Plaque Problem.  

The inner lining of all blood vessels of the body, the endothelium, is very sensitive to glucose. If blood sugar is high, glycation occurs and glucose molecules bind to proteins in the arterial wall. This compromises the endothelial barrier and causes inflammation. LDL cholesterol enters these damaged areas and gets oxidized, causing an immune response that results in plaque formation. As time goes on, the plaque builds up and constricts the arteries. If it should rupture it is a heart attack for diabetes.

This is known as atherosclerosis, and occurs to all of us to some extent as we grow older. However, if a person has poor control of their diabetes it occurs more quickly and more blood vessels are involved. The American Heart Association states that two to four times as many people with diabetes get coronary artery disease. They acquire it at an earlier age. The disease also affects several vessels and is thus more difficult to treat than a single vessel blockage.

Pathway 2: Insulin Resistance and the Cardiovascular Risk Cluster

Insulin resistance, which is a major feature of type 2 diabetes and heart disease, isn't limited to raising blood sugar. It promotes a cascade of cardiovascular risk factors that amplify one another. Increased insulin leads to retention of sodium which causes an increase in blood pressure. Insulin resistance increases triglycerides and decreases HDL (good cholesterol). It allows the accumulation of fat in the abdominal cavity and causes chronic low-grade inflammation. And it makes existing LDL particles smaller and denser, that is, more likely to penetrate the arterial wall and begin to create plaque.

Diabetes and high blood pressure often occur together, because they have a similar underlying cause – insulin resistance. If both are present, and not properly managed, their combined cardiac risk is not additive, but multiplicative. An uncontrolled hypertensive diabetic is at an extremely high risk of cardiac events compared to either uncontrolled hypertension or diabetes alone.

Pathway 3: Diabetic Neuropathy & The Silent Heart Attack

The cardiac nerves are among the nerves damaged by chronic high blood sugar. One especially risky diabetes complications this autonomic neuropathy is that it can kill the warning signs of a heart attack. The classical signs and symptoms of a heart attack: a heavy, crushing pressure in the chest, left arm pain, and profuse sweating, rely on intact pain-transmitting nerves. In some cases, a heart attack will happen entirely without any noticeable chest pain, and instead, patients will experience only shortness of breath, nausea, unusual fatigue or just a feeling of something being out of place.

High likelihood of a "silent" or atypical myocardial infarction (MI) in diabetics: Diabetes is strongly associated with the presence of an MI that does not present with the usual intense chest pain (so-called "silent" MI). This involves a diabetic patient who feels unusually short of breath when exercising, is unusually fatigued, has some discomfort in the jaw, the upper back, or has palpitations and/or dizziness should seek cardiac evaluation promptly. These are not symptoms to be ignored.

The Diabetes-specific Heart Conditions It Causes

Coronary Artery Disease[Text Wrapping Break]CAD occurs when the arteries that bring blood and oxygen to the heart muscle become narrowed or blocked. It's the most prevalent type of diabetes-related heart disease and is the top killer for those with Type 2 diabetes. High blood sugar and high insulin cause the atherosclerosis to form plaque in the coronary arteries. If the plaque is stable, then it may cause chest pain when the heart is working hard, but will not cause pain during rest. When a diabetes heart attack risk plaque is unstable or ruptures, it's an instant and life-threatening danger.

Diabetic Cardiomyopathy[Text Wrapping Break]Diabetic cardiomyopathy is a type of heart muscle disease that is unique to diabetes, which is separate from heart disease incurred by blocked arteries. Diabetic cardiomyopathy is characterized by an inefficient functioning of the heart muscle itself, not due to a lack of blood supply, but due to metabolic changes that occur in chronic hyperglycemia, insulin resistance, and inflammation as a result of diabetes. As described it is diastolic dysfunction, blood filling the heart is normal, but it does not relax  and may lead to heart failure even without the presence of significant coronary artery disease.

Heart Failure[Text Wrapping Break]Heart failure can occur with greater frequency in people who have diabetes compared to other people. These mechanisms are diabetic cardiomyopathy, cardiac remodelling caused by hypertension, which co-exists in most of the patients, and higher inflammatory state due to insulin resistance. CDC reports that adults with diabetes are almost twice as likely to experience heart disease or stroke as adults without diabetes. Diabetic heart failure is also complicated by the fact that some of the medications used to treat diabetes can have a different effect on the failing heart; that's why it's important for a specialist to co-manage the condition.

Peripheral Arterial Disease[Text Wrapping Break]The same atherosclerosis which obstructs the coronary arteries causes blockages to the arteries of the legs and feet. The symptoms of PAD include pain in the calves, which occurs during walking (claudication), delayed wound healing and in extreme cases, critical limb ischaemia, which can lead to amputation. Many patients with PAD have not experienced a cardiac event but have developed evidence of diabetes and cardiovascular disease at the same time that they have PAD symptoms.

The combination of risk factors in Diabetic patients

A majority of diabetic patients do not have a single cardiac risk factor, but rather more than one is at play simultaneously. This table correlates each factor with the impact that diabetes has on it and the clinical target:

Diabetic patients need to undergo a few tests to determine their heart health.

Early phases of the diabetes complications that affect the heart are largely hidden. Structured monitoring is the only way to detect them prior to a clinical event. A diabetic person should not wait for symptoms to get a cardiac evaluation. The following tests are a part of yearly review for every diabetic patient:

• HbA1c test every 3 months: The average blood sugar over 3 months is the single most important number to measure the risk of damaging the vessels. For every HbA1c percentage drop, 1% or more, per patient, there is a significant decrease in cardiovascular events.
• Lipid profile (total cholesterol, LDL, HDL, and triglycerides) every six months. Diabetic patients have a higher level of treatment for statins  the target is to keep LDL below 70 mg/dL if they have other cardiac risk factors.
• Blood pressure at each visit: Diabetes and high blood pressure in the same patient target is less than 130/80 mmHg (more aggressive than general population target) Annual urine microalbumin is a cardiac risk marker in itself as it is a sign of early kidney damage (before an increase in creatinine). The presence of albumin in the urine at a ratio of more than 30 mg of albumin per gram of creatinine is a sign of early nephropathy.
• Annual resting ECG: identifies rhythm disturbances and the electrical signs of a silent heart attack which the patient might not have recognised as a cardiac event.
• Echocardiogram (indicated): Evaluates heart chamber function, wall motion, ejection fraction and early diastolic dysfunction. Should be undertaken at the time of diagnosis and repeated if breathlessness or decreased exercise tolerance occurs
• Treadmill stress test (TMT): In male patients > 45 years and female patients > 50 years who have any other cardiac risk factors, a treadmill stress test detects flow-limiting coronary artery disease before a resting ECG becomes abnormal

The cardinal rule of diabetes and heart health is that all three HbA1c, blood pressure, and LDL  must be on target at the same time. The cardiovascular benefit is reduced if you treat one without the others. If a diabetic patient has a good HbA1c level, but their blood pressure is still 160/100, then they have not controlled their cardiac risk. All three are systemically managed in parallel.

What You Can Still Do is the Modifiable Risk Factors

The prevalence of diabetes and cardiovascular disease is a huge problem in India. However, a significant portion of this risk is controllable  and when it is, there are clinically important, measurable, and real decreases in the likelihood of cardiac events.

• Over time, a 1% drop in HbA1c levels for each increase for the upper limit (above target) is associated with a 14% decrease in the risk of heart attack and a decrease of 12% in the risk of stroke. (UKPDS)
• 10 mmHg reduction in systolic blood pressure reduces major cardiovascular events in diabetic patients by approximately 12% and heart failure by 25%
• There is no change in cardiac events with statins in diabetic patients, regardless of the baseline LDL level, over the 5-year period.
• Upon losing 5-10 kg, overweight diabetic patients's HbA1c, BP, triglycerides and HDL improves.
• Aerobic exercise reduces mortality from cardiovascular disease, improves insulin sensitivity, and lowers blood pressure by itself, for a total of 150 minutes per week.

Two classes of modern diabetes drugs have been specifically proven in clinical trials to decrease hospitalisation for heart failure, cardiac events, and cardiac death in diabetic patients, without any effect on glucose levels.Two classes of diabetes medications have been proven specifically to decrease cardiac events, cardiac death and hospitalisation for heart failure, regardless of their glucose-lowering effect, in diabetic patients: SGLT2 inhibitors and GLP-1 agonists. These are now advised for people with diabetes who have pre-existing heart disease or high risk for heart disease.

Managing Diabetes and Heart Health at Jaipur Vatika Hospital

At Jaipur Vatika Hospital, the diabetes and the heart health are given a co-treatment facility by the Cardiology and General Medicine departments in a direct interplay:

• Cardiology: Dr Ram Chandra Ghasil (MBBS, MRCP UK, FRCP London, 30 years) will be in charge of cardiac risk stratification for diabetic patients, ECG, AI-detected echocardiography, exercise stress test, heart failure management, and arrhythmia evaluation.
• General Medicine: Dr. Amit Ghasil (MBBS, MRCP London, ex-NHS)  comprehensive diabetes complications management, HbA1c optimisation, lipid and blood pressure management, SGLT2 inhibitor and GLP-1 therapy (where appropriate) and coordination of annual cardiac screening
• Same-visit diagnostics: In-house laboratory that is NABL accredited, providing results for HbA1c, lipid profile, fasting glucose, kidney function, urine microalbumin, cardiac enzymes  all in one shot without any delay at the external laboratory.

The review of diabetes and cardiac review conducted at JVH includes the following: HbA1c and metabolic panel, Lipid profile, Urine microalbumin, Blood pressure with target review, Resting ECG, Medication review (including diabetes drugs that protect the heart), Counselling about diet and exercise in the context of the Rajasthani diet

Distant from Bagru and Dudu in less than 15 minutes; located in Jaipur-Ajmer Expressway, Thikariya.

Book: JVH E-Consultation App , Call +91-8209809753

Conclusion

Diabetes is one of the risk factors for cardiovascular disease. Not a mild one. Not a distant one. Over years poorly managed diabetes and high blood pressure lead to an increased risk of a heart attack with no chest pain, a 2-4 fold increase in coronary artery disease (a unique type of heart muscle damage), and a group of risk factors that are all raised at the same time, which is a multiplier effect. None of them can be detected when they trigger the event. Many of these can be substantially controlled by the use of medication, lifestyle modification and structured monitoring.

The Cardiology department and General Medicine department at the Multispeciality Hospital in Jaipur at Thikariya, Ajmer Expressway, provides an integrated diabetes & heart care treatment program. Book via the JVH E-Consultation App or call +91-8209809753.