The recommended limit of caffeine during pregnancy is 200 milligrams (mg) a day. So with a typical soda containing 35 to 55 mg of caffeine, it's wise to limit yourself accordingly, and take into account other sources of caffeine in your diet, such as coffee, tea, and energy drinks.
If you have a known heart problem, such as heart failure or heart disease, PVCs may be a sign that a dangerous heart rhythm could occur. So if you have a heart problem, talk to your doctor if you feel any change in your heartbeat. The cause of PVCs usually isn't known. But the chance of having PVCs can be increased by: 1  Having too much or too little of certain minerals (electrolytes) in your body. 2  Having too little oxygen in your blood, which could happen if you have COPD or pneumonia. 3  Using some medicines, such as albuterol.
Causes of heart palpitations. Heart palpitations are frequently caused by stress or anxiety. In addition to making you feel terrible emotionally, stress can have a physical effect on your body. As a result, stress can cause the nerve endings that control your heart to fire more frequently or irregularly. Anxiety and panic attacks can also trigger palpitations by elevating adrenaline levels. Food and drink can cause heart palpitations. Caffeine, nicotine, and alcohol can all affect your heart rate and may also increase the likelihood of irregular heartbeats. Some medications can cause heart palpitations. These include asthma inhalers, over the counter medications such as pseudoephedrine, and thyroid medications.