Is it dangerous to have a heart rate of 50 to 60 after stent placement

In most cases, a heart rate of 50-60 beats per minute after stent implantation is within the safe range. Whether it is dangerous or not needs to be comprehensively judged based on factors such as underlying diseases, symptom manifestations, and electrocardiogram characteristics. The main evaluation indicators include the presence of hypoperfusion symptoms such as dizziness and fatigue, the presence of atrioventricular block, and the presence of myocardial ischemia manifestations such as ST-T changes.

1. Symptom assessment: Asymptomatic sinus tachycardia usually does not require intervention and is common in athletes or long-term medication patients. If accompanied by symptoms of insufficient cerebral blood supply such as blackening in front of the eyes and temporary loss of consciousness, it may indicate severe bradycardia and require urgent treatment. The transient decrease in heart rate during nighttime sleep is mostly a physiological phenomenon.

2. Electrocardiogram analysis:

Dynamic electrocardiogram can distinguish between sinus bradycardia and sick sinus syndrome. Second degree type II or above atrioventricular block and long intervals greater than 3 seconds are considered danger signals. The newly developed left bundle branch block after stent implantation may indicate coronary artery restenosis.

3. Drug effects:

beta blockers, diltiazem, and other anti angina drugs can inhibit sinus node function. When using digitalis drugs in combination, one should be cautious of arrhythmia caused by drug overdose. If there is a progressive decrease in heart rate under standardized medication after surgery, adjustment of drug dosage should be considered.

4. Myocardial function:

Echocardiography can evaluate left ventricular ejection fraction, and caution should be exercised when the EF value is below 35% for the risk of sudden cardiac death. Patients with a necrotic area exceeding 40% after myocardial infarction are more likely to develop malignant arrhythmias. The sustained increase in blood BNP levels indicates the progression of heart failure.

3. Basic diseases:

Patients with diabetes autonomic neuropathy often have a fixed heart rate. hypothyroidism can lead to metabolic bradycardia. Electrolyte imbalance in patients with chronic renal insufficiency may induce conduction disorders. These underlying diseases can amplify the risk of decreased heart rate. After stent implantation, patients should measure their resting heart rate every morning and record the trend of changes to avoid sudden changes in position that may induce orthostatic hypotension. Pay attention to supplementing dark vegetables and nuts rich in potassium and magnesium in diet, and limit high-fat diet to reduce heart load. Under the guidance of a doctor, low-intensity aerobic exercises such as Tai Chi and walking training should not exceed 20% of the preoperative baseline heart rate during exercise. If there is obvious chest tightness, shortness of breath or heart rate continuously below 45 beats per minute, immediate medical attention should be sought for follow-up coronary angiography.