There are several symptoms of decreased cardiac output, although not everyone will experience all of the possible symptoms. The symptoms could include tachycardia, which is a fast heart rate, weak, irregular pulse, confusion, clammy skin, and swelling of ankles, feet, or belly. There are necessary assessments done to check for decreased cardiac output. The assessment would include, checking pulse, measure heart rate, heart sounds, respiration, blood pressure, check for chest pain, chest x-ray, and an echocardiogram.
You should also check the oxygen saturation and pulse oximetry and edema in the feet and ankles. The pulse would be weak and irregular, heart rate more than 60 beats per minute, soft and irregular heart sounds, shallow breathing with dyspnea, low blood pressure, and chest pain. An x-ray may show fluid buildup or heart enlargement, and an echo may show enlargement of the heart with fast pumping and possibly not filling correctly.