Pharmacology of Vasoconstrictors

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What is the primary reason for adding vasoconstrictors to local anesthetic solutions?

To decrease anesthetic blood levels

To oppose the vasodilatory actions of the local anesthetics (correct)

To decrease the depth of anesthesia and the duration of action

To increase blood flow (perfusion) to the site of administration

What is the impact of blood vessel dilation after local anesthetic injection into tissues?

Increased rate of absorption of the local anesthetic into the cardiovascular system

Decreased bleeding at the site of treatment (correct)

Decreased depth of anesthesia and decreased duration of action

Higher plasma levels of the local anesthetic

Why do high plasma levels of the local anesthetic pose an increased risk of toxicity?

They decrease blood flow (perfusion) to the site of administration

They increase bleeding at the site of treatment

They remove the local anesthetic from the injection site, leading to rapid diffusion

They decrease the depth of anesthesia and the duration of action (correct)

How do vasoconstrictors impact the absorption of local anesthetics into the cardiovascular system?

They slow down absorption into the cardiovascular system Signup and view all the answers

What is the main impact of vasoconstrictors on blood flow (perfusion) to the site of administration?

They decrease blood flow to the site of administration Signup and view all the answers

What is the primary purpose of using vasoconstrictors in conjunction with injected local anesthetics?

To decrease bleeding at the site of administration Signup and view all the answers

Which of the following is a catecholamine?

Dopamine Signup and view all the answers

What is the mode of action of indirect-acting sympathomimetic drugs?

Acting by releasing norepinephrine from adrenergic nerve terminals Signup and view all the answers

What is the primary function of alpha receptors when activated by sympathomimetic drugs?

Contraction of smooth muscle in blood vessels (vasoconstriction) Signup and view all the answers

Based on their function and location, how are α receptors subcategorized?

Based on their excitatory or inhibitory actions on smooth muscle Signup and view all the answers

Pharmacology of Vasoconstrictors

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Questions and Answers

What is the primary reason for adding vasoconstrictors to local anesthetic solutions?

What is the impact of blood vessel dilation after local anesthetic injection into tissues?

Why do high plasma levels of the local anesthetic pose an increased risk of toxicity?

How do vasoconstrictors impact the absorption of local anesthetics into the cardiovascular system?

What is the main impact of vasoconstrictors on blood flow (perfusion) to the site of administration?

What is the primary purpose of using vasoconstrictors in conjunction with injected local anesthetics?

Which of the following is a catecholamine?

What is the mode of action of indirect-acting sympathomimetic drugs?

What is the primary function of alpha receptors when activated by sympathomimetic drugs?

Based on their function and location, how are α receptors subcategorized?

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