Problem 107 - Chemistry The Molecular Science

Question

Choose the words that make this statement true: During a televised medical drama, a person went into cardiac arrest and stopped breathing. A doctor quickly injected sodium hydrogen carbonate solution into the heart. This would indicate that cardiac arrest leads to (acidosis or alkalosis) and that the sodium hydrogen carbonate helps to (increase or decrease) the pH. Explain your choices clearly.

Step-by-Step Solution

Answer

Cardiac arrest leads to acidosis, and sodium hydrogen carbonate increases the pH.

Step 1: Understand the Context

Cardiac arrest often leads to a serious condition caused by an imbalance in blood pH levels, which is a measure of the acidity or basicity of the blood. This condition can be either acidosis (too acidic) or alkalosis (too basic).

Step 2: Recognize the Role of Sodium Hydrogen Carbonate

Sodium hydrogen carbonate, also known as baking soda, is a mildly basic compound. When used in medical treatment, it can help neutralize excess acids in the blood, thus increasing the pH level towards a more normal range.

Step 3: Determine the Condition Based on Treatment

Since sodium hydrogen carbonate is used to increase the blood pH, this suggests the initial condition was a low pH, meaning the blood was too acidic. Thus, cardiac arrest must lead to acidosis.

Step 4: Determine the Effect on pH

From the use of sodium hydrogen carbonate, we can deduce that the goal was to increase the pH level of the blood, counteracting the acidosis by making the blood more basic or neutral.

Key Concepts

Acidosis

Acidosis occurs when there is a buildup of acid in the bloodstream. This can be a serious condition as it alters the normal functioning of cells and tissues. During a cardiac arrest, the body's oxygen supply is severely compromised, causing anaerobic metabolism. This leads to the accumulation of lactic acid and a lowering of the blood’s pH, creating a state of acidosis.

Common causes of acidosis include:

• Lactic acidosis from intensive exercise or severe oxygen deprivation.
• Diabetic ketoacidosis due to uncontrolled diabetes.
• Renal failure where the kidneys fail to remove sufficient acid from the body.

Cardiac arrest-induced acidosis occurs quickly because the heart stops effectively pumping, resulting in systemic accumulation of acids. Immediate medical intervention is critical to restore the balance.

Sodium Hydrogen Carbonate

Sodium hydrogen carbonate, more commonly known as sodium bicarbonate or baking soda, is a chemical compound used in various medical situations, including treating acidosis. When dissolved in water, sodium hydrogen carbonate forms a mildly alkaline solution, which can help counteract acidic conditions in the body.

Key functions of sodium hydrogen carbonate in medical treatments include:

• Neutralizing acids: Helps in balancing the blood pH by neutralizing excess acids.
• Buffering agent: Maintains the pH within a narrow range for optimal function of cellular processes.

In the case of cardiac arrest, injecting sodium hydrogen carbonate can aid in quickly raising the blood's pH level, counteracting the acidosis caused by the oxygen deficit. This rapid correction helps stabilize the patient until further medical treatment can be administered.

pH Balance

The balance of pH is vital for homeostasis in the human body. The pH scale ranges from 0 to 14, with 7 being neutral. A pH below 7 is acidic, while above 7 is basic. Normal blood pH is slightly alkaline, around 7.35 to 7.45.

Maintaining proper pH balance is crucial because:

• Enzyme Function: Enzymes require specific pH levels to function properly, aiding in various biochemical reactions.
• Oxygen Transport: Blood pH affects the ability of hemoglobin to bind and release oxygen efficiently.
• Electrolyte Equilibrium: Balanced pH is essential for the proper functioning of nerve and muscle cells.

During cardiac arrest, pH imbalance such as acidosis can impair these functions significantly.
Treatment aims to restore pH within the normal range, ensuring all body systems operate effectively and integratively.