Worsening heart failure:
warning signs and when to go to the emergency department

Article written and reviewed by Dr Luca Moretti

In a person with previously diagnosed heart failure, deterioration often presents as more shortness of breath than usual, increased swelling, rapid weight gain, greater difficulty sleeping flat, or reduced ability to carry out normal activities. Recognizing these changes is important because decompensation can begin gradually, before symptoms become severe enough to require hospitalization.
Not every change requires an emergency department visit: some should be reported promptly to the physician or heart failure team, while others are true emergency warning signs.

Signs that may indicate deterioration include:

• more severe shortness of breath or shortness of breath occurring with less exertion than usual;
• new difficulty breathing while lying flat or the need to increase the number of pillows;
• waking at night gasping for air;
• increased swelling of the feet, ankles, legs, or abdomen;
• rapid and unexpected weight gain;
• clear reduction in the ability to walk or perform daily activities;
• more frequent coughing, especially at night;
• loss of appetite, nausea, or increased abdominal swelling;
• new palpitations, dizziness, weakness, or confusion.

These changes may accompany acute decompensation of chronic heart failure. The most important practical point, however, is comparison with your own stable condition: what matters is recognizing deterioration compared with the preceding days or weeks.

How to notice that heart failure is changing

Heart failure may worsen noticeably or through small but progressive changes. A person who can normally take a walk may begin to stop more often; someone who sleeps with one pillow may find that they need to raise the upper body; shoes may become tighter in the evening, or the belt may feel tighter because of increased abdominal volume.
These signs often reflect increased congestion, but they are not always caused exclusively by the heart. Infections, arrhythmias, ischemia, medication changes, excess sodium, kidney problems, and other conditions can precipitate decompensation or produce similar symptoms.

For this reason, home monitoring is not intended to replace clinical assessment, but to recognize a change early. Weight, breathing, edema, blood pressure, and heart rate can be monitored according to the plan agreed with the care team. A single isolated value is less useful than the trend over time.

Weight and edema: what to monitor at home

Weight can increase rapidly when the body retains fluid. To make measurements comparable, when monitoring is indicated it is useful to weigh yourself under the same conditions: preferably in the morning, after urinating and before breakfast, using the same scale. European self-care recommendations have often used an unexpected increase of more than about 2 kg in 3 days as a sign that may require intervention, but this is not a universal threshold and the personal limit should be agreed with the physician.
Weight gain may precede the appearance of obvious edema. Conversely, in some patients weight changes little even while congestion is increasing.

It is also useful to observe the ankles and legs, check whether swelling leaves an indentation after pressure, and notice whether the abdomen appears more tense. Increased edema without severe symptoms generally warrants prompt contact with the care team, especially if it persists or is accompanied by weight gain and increased shortness of breath.
The diuretic dose should not be changed independently unless the patient has received a written, personalized plan from their team specifying exactly when and how to do so.

Shortness of breath, sleep, and reduced ability to exert yourself

An important sign is worsening dyspnea. It may first appear during activities that were previously well tolerated and then with progressively less exertion. If the person begins to become short of breath while dressing, speaking, or walking only a few meters, the change deserves particular attention.
Sleep can also provide information: new orthopnea, the need for more pillows, waking with air hunger, or nighttime cough may suggest increasing pulmonary congestion.

The sudden onset of very severe dyspnea is different from slow deterioration. It may indicate an acute condition such as cardiogenic pulmonary edema, especially if the person is agitated, sweating heavily, breathing rapidly, or producing pink frothy sputum. In this situation, a scheduled appointment should not be awaited.

When to contact the physician or heart failure team promptly

A gradual increase in shortness of breath, increasing edema, rapid weight gain, new orthopnea, reduced ability to carry out activities, or new symptoms should be reported without waiting for them to become severe. The team can decide whether to bring a visit forward, check kidney function and electrolytes, modify treatment, or look for a precipitating factor.
Persistent palpitations, blood pressure very different from the person's usual values, new dizziness, poor appetite, or reduced urine output may also be relevant, especially when they occur together with other signs of congestion or hypoperfusion.

Anyone who has recently been hospitalized or has had major treatment changes may require closer monitoring. Recommendations must still be individualized: a patient with advanced heart failure may have different thresholds for concern from a person who has been stable for a long time.

When to call 112 or 118

Urgent medical assistance is required in the presence of sudden or severe breathing difficulty, especially if the person is short of breath even at rest, cannot speak normally because of breathlessness, or has blue or gray discoloration of the lips and skin. Significant chest pain, fainting, loss of consciousness, severe weakness, marked confusion, or a very rapid or irregular heartbeat associated with dyspnea, chest pain, or syncope are also warning signs.
A state of hypotension with reduced perfusion can progress to cardiogenic shock and requires immediate hospital treatment.

In these cases, it is preferable to call 112 or 118 and follow the emergency dispatch center's instructions, rather than driving yourself to the emergency department. If the person loses consciousness and is not breathing normally, this must be reported immediately to the operator and the maneuvers indicated by the dispatch center should be started.

Frequently asked questions about signs of deterioration

How can you tell whether heart failure is getting worse?
The most useful signs are more shortness of breath than usual, greater difficulty lying flat, increased swelling, rapid weight gain, reduced ability to perform daily activities, and new symptoms such as palpitations, dizziness, or loss of appetite.

How much weight gain should be concerning in heart failure?
There is no identical threshold for everyone. Self-care recommendations often use an unexpected increase of more than about 2 kg in 3 days as a sign of possible fluid retention, but the personal threshold should be agreed with the care team.

If leg swelling increases, should I go straight to the emergency department?
Not necessarily. Increased edema without severe symptoms generally requires prompt contact with the physician or heart failure team. If it is associated with severe breathing difficulty, chest pain, fainting, or other signs of instability, urgent medical attention is required.

When is heart failure an emergency?
Emergency signs include sudden or severe breathing difficulty, significant chest pain, fainting or unresponsiveness, severe weakness with signs of hypotension, marked confusion, blue or gray discoloration of the lips and skin, or pink frothy sputum.

In an emergency, is it better to drive to the emergency department?
No. In the presence of severe symptoms, it is preferable to call 112 or 118 and follow the emergency dispatch center's instructions, avoiding driving yourself.