Diffuse steatosis is a relatively common disease in our life, which seriously affects our health and can lead to the appearance of chest tightness, heart pain and other symptoms, so how to check for diffuse steatosis? Myocardial steatosis is often the result of severe anemia, hypoxia or infectious toxicity. Myocardial steatosis, focal myocardial steatosis is seen in prolonged moderate hypoxia with significant lesions. Diffuse myocardial steatosis is seen in poisoning and severe hypoxia. In raw steatosis, the content of intracellular lipid droplets in the myocardium is significantly increased. The most prominent sites of myocardial steatosis are the papillary muscle and subendocardial myocardium. In the subepicardial and ventricular papillary muscles and around the veins of the meatus, grayish-yellow stripes or spots can be seen between the normal-colored myocardium, with the appearance of yellow-red tiger skin pattern, so it is called “tiger heart”. On light microscopy, small, bead-like fat vacuoles appear in the myocardial cell pulp, arranged between longitudinal rows of myogenic fibers. Cardiac phonogram: The vibrations generated during the heart activity are recorded from the chest wall by means of a special electronic instrument called a cardiogram machine, which is called a cardiac phonogram. It cannot distinguish whether the sound source comes from inside or outside the heart, nor can it distinguish the timbre of heart sounds and murmurs (such as rumbling or blowing). Sometimes the heart sounds and murmurs traced by cardioplethysmography cannot be heard by the human ear, but sometimes the heart sounds that can be heard by the human ear cannot be recorded by cardioplethysmography (e.g., some diastolic murmurs of the aortic valve), and the human ear is more sensitive to high frequencies with the help of a stethoscope when necessary. Doppler echocardiography: Doppler echocardiography has many red blood cells within the blood, which reflect and scatter ultrasound and can be thought of as a tiny source of sound. The probe is placed in the intercostal space without moving while emitting ultrasound, and the sound frequency scattered by the red blood cells changes as they flow through the heart or large blood vessels. As the red blood cells move toward the probe, the reflected sound frequency increases, and vice versa, decreases. This difference in sound frequency between the red blood cells and the probe in relative motion is called the Doppler shift. It shows the speed and direction of blood flow and the nature of the blood flow. Doppler echocardiography is divided into pulsed Doppler echocardiography, continuous wave Doppler echocardiography, and color Doppler echocardiography. The most commonly used is pulsed Doppler echocardiography, which provides a real-time Doppler spectrogram of blood flow at any point in the heart with two-dimensional image monitoring and positioning.