Drowsiness in heart failure patients is a bad phenomenon. The phenomenon of drowsiness in patients with heart failure may be due to the decline in cardiac ejection fraction, cardiac output is reduced, resulting in insufficient blood supply to the brain, brain hypoxia is more likely to cause drowsiness. Of course, it can not be ruled out that the patient has a cerebral thrombosis, cerebral infarction and other diseases triggered. This phenomenon, patients also need to go to the hospital in time to do cranial CT, MRI and other related tests to confirm the diagnosis. Avoid the lack of timely treatment led to the aggravation of the disease, endangering the life and health of individuals. Heart failure patients are also more prone to the phenomenon of acid-base imbalance, if necessary, also need to check the blood gas analysis for diagnosis. During this period, it is also necessary to observe the patient’s body to see if there are any other abnormalities, and if there are any abnormalities, it is necessary to communicate with the doctor in a timely manner.