Skin vasoconstriction in a mesh pattern

Introduction Skin vasoconstriction is a reticular pattern and is considered to be a feature of lightning damage. Electric shock is the damage caused by current passing through the human body. Usually caused by accidental electric shock or lightning strikes. When a person is struck by lightning, the heartbeat and breathing often stop immediately, accompanied by myocardial damage. Myosinuria The harm of low-frequency alternating current is higher than that of high frequency, especially when the frequency is 50-60Hz (hertz) per second, it is easy to induce ventricular fibrillation. Therefore, the harm of alternating current is greater than that of direct current. The resistance of different tissues under different conditions is also different.

Cause

There are many reasons for causing electric shocks. The main reason is the lack of knowledge about safe electricity use. Installation and maintenance of electrical appliances and wires are not carried out according to the regulations. High temperature, high humidity and sweating reduce the surface resistance of the skin and cause electrical damage. In the event of an accident, the wire is broken and falls into the human body, and when it is raining under a tree under thunderstorms or hit by lightning with an iron umbrella, it can cause electrical damage.

The human body acts as a conductor and becomes part of the circuit when it contacts the current. The severity of the human body damage is closely related to the voltage level, the current intensity, the DC and AC power, the frequency, the power-on time, the contact location, the current direction and the meteorological conditions of the environment. The relationship with the voltage is greater. A voltage of 40V is a risk of tissue damage, 220V can cause ventricular fibrillation, and 1000V can cause paralysis of the respiratory center. The current can depolarize the muscle cell membrane. 10-20 mA (milliamperes) can cause muscle contraction, and 50-60 mA can cause ventricular fibrillation. AC power keeps the muscles twitching and can be carryed by the power source so that the electric shocker cannot break away from the power supply. The harm of low-frequency alternating current is higher than that of high frequency, especially when the frequency is 50-60Hz (hertz) per second, it is easy to induce ventricular fibrillation. Therefore, the harm of alternating current is greater than that of direct current. The resistance of different tissues under different conditions is also different.

an examination

Related inspection

Blood routine electrocardiogram

Lightning damage

When a person is struck by lightning, the heartbeat and breathing often stop immediately, accompanied by myocardial damage. Skin vasoconstriction is a reticular pattern and is considered to be a feature of lightning damage. Then myosinuria appears. Other clinical manifestations are similar to high-voltage electrical injuries.

Differential diagnosis

Differential diagnosis of vascular contraction of the skin in a reticular pattern:

1, the skin is scaly: psoriasis patients with scaly skin, psoriasis is a common chronic skin disease, characterized by repeated appearance of multiple layers of silver-white dry scales on the erythema. Traditional Chinese medicine is called "white scale ", and ancient medical books are also called pine bark. Western medicine is called Psoriasis, commonly known as psoriasis, which is characterized by the appearance of papules of varying sizes, erythema, covered with silvery white scales, clear boundaries, and occurs in the scalp, the extremities and the back. More men than women. Spring and winter seasons are prone to recurrence or aggravation, while summer and autumn are more relieved.

2. Small blisters on the skin with pain: Herpes zoster keratitis is a manifestation of herpes zoster's prodromal symptoms including general malaise, fever, chills and pain along the nerve skin distribution area. Blisters; accompanied by neuralgia, from the tingling felt extremely persistent pain.

3, skin purple lines: skin purple lines refers to the skin has purple, silk, and different sizes of skin, often distributed in the lateral side of the hip, the inner and outer thighs, underarms, neck and lower abdomen, mostly high Characteristic changes associated with cortisolemia.

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