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week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Alterations in Neurobiological Functions
DEPRESSION
Introduction to Depression
Major depressive disorder is a mood disorder characterized by depressive
symptoms that last longer than 2 weeks. Though the exact cause is unknown,
depression can be influenced by genetic and environmental factors. Stressful
life events, such as giving birth or experiencing emotional trauma, can also
impact the development of depression. Recent research has tied depression to
decreased activity of the prefrontal cortex (Buelt, 2023). The prefrontal cortex
controls attention, memory, mood, and personality.
This learning module focuses on disease processes associated with depression
and enables you to meet the following course outcomes:
CO 1: Analyze pathophysiologic mechanisms associated with selected
disease states across the lifespan.
CO 2: Examine the way in which homeostatic, adaptive, and
compensatory physiological mechanisms can be supported and/or altered
through specific therapeutic interventions across the lifespan.
CO 3: Distinguish risk factors associated with selected disease states
across the lifespan.
CO 4: Integrate advanced pathophysiological concepts in the diagnosis
and treatment of health problems in selected populations.
Recognizing Depression
The nurse practitioner (NP) is discussing a client’s reason for seeking care.
Which client statements should the NP recognize as being associated with
depression? Select all that apply.
“I feel so hopeless, and everyone says I look sad.”
“Lately, I cannot seem to remember anything without writing it down.”
“My partner is frustrated because I can’t make decisions about our upcoming
vacation.”
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
“I have so much more energy these days.”
“Never in my life have I felt so worthless; I feel guilty about everything.”
---------------
Symptoms of depression can include difficulty making decisions, feeling
hopeless and sad, and feeling guilt or self-negativity.
Impaired recent and immediate memory or episodes of extreme energy are
not associated with major depressive disorders.
------------------
Tricyclic Antidepressants
The nurse practitioner (NP) prescribes a tricyclic antidepressant for a client
with newly diagnosed major depressive disorder (MDD). Which statement
should the NP include when providing client education?
“This medication will take 2–4 weeks to reach a therapeutic blood level.”
“Most clients notice a change in their mood within 36 hours after the first
dose.”
“Generally, 5–7 days are needed for the medication to start working.”
“Your symptoms should improve over the next 3–4 months.”
-----------
It takes 2 to 4 weeks for tricyclic antidepressants to reach a therapeutic blood
level.
Within 36 hours and 5 to 7 days are both too short for a therapeutic blood level
of the drug to be achieved. Improvement in depression should be
demonstrated sooner than 3 to 4 months.
---------------
Acetylcholine and Mood
Which statement best explains how acetylcholine impacts mood?
Acetylcholine regulates neural circuits in the hippocampus and prefrontal
cortex.
Acetylcholine targets both serotonin and norepinephrine systems.
Acetylcholine contributes to normal muscle contraction.
Acetylcholine binds to receptors on the presynaptic neuron.
--------
Acetylcholine is involved in regulating neural circuits associated with mood and
emotion, particularly in brain regions such as the hippocampus and prefrontal
cortex. Changes in acetylcholine levels or receptor function in these areas may
impact mood regulation and contribute to depressive symptoms.
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Acetylcholine's impact on muscle contraction is not related to its impact on
mood. Acetylcholine binds to postsynaptic (not presynaptic) neuron
receptors. Acetylcholine acts on two main types of receptors: muscarinic
receptors and nicotinic receptors.
-----
Normal Physiology of Serotonin and
Norepinephrine
Serotonin and norepinephrine are chemical messengers that, along with
dopamine and acetylcholine, play a crucial role in communication between
nerve cells (neurons) in the brain. These neurotransmitters are involved in
various physiological processes and are particularly relevant to the
understanding of depression. Click each section below to learn more about the
normal physiology of neurotransmitters.
Serotonin
Synthesis and Release: Serotonin is synthesized in the neurons from the
amino acid tryptophan. Once synthesized, serotonin is stored in vesicles within
the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a neuron,
serotonin is released into the synapse (the gap between neurons). After
release, some of the serotonin binds to receptors on the postsynaptic neuron,
transmitting the signal. The remaining serotonin is taken back up into the
presynaptic neuron through a process called reuptake, where it can be
recycled.
Receptors: Serotonin binds to specific receptors on the postsynaptic neuron.
There are various subtypes of serotonin receptors (e.g., 5-HT1, 5-HT2), and
their activation can have different effects on mood, emotion, and other
physiological functions.
Norepinephrine
Synthesis and Release: Norepinephrine is synthesized from the amino acid
tyrosine. Like serotonin, it is stored in vesicles in the nerve terminals.
Release and Reuptake: Upon a nerve impulse, norepinephrine is released
into the synapse. It then binds to receptors on the postsynaptic neuron. The
unbound norepinephrine is also subject to reuptake into the presynaptic
neuron for recycling.
Receptors: Norepinephrine primarily acts on adrenergic receptors, of which
there are alpha and beta subtypes. The activation of these receptors can have
various effects on mood, alertness, and other physiological responses.
Downloaded by elizabeth moses ()
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, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Dopamine
Dopamine is another important neurotransmitter in the brain, and it plays a
crucial role in various physiological processes, including mood regulation,
motivation, reward, and motor control. While dopamine is not as directly linked
to depression as serotonin and norepinephrine, it still plays a role in our
understanding of mood disorders.
Synthesis and Release: Dopamine is synthesized from the amino acid
tyrosine, and its synthesis takes place within the neurons. Once
synthesized, dopamine is stored in vesicles in the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a
neuron, dopamine is released into the synapse. Dopamine binds to
receptors on the postsynaptic neuron, transmitting the signal. Unbound
dopamine can be taken back up into the presynaptic neuron through
reuptake for recycling.
Receptors: Dopamine acts on several types of receptors, classified into
D1-like (including D1 and D5) and D2-like (including D2, D3, and D4)
receptors. The activation of these receptors can have different effects on
mood, motivation, and other physiological functions.
Acetylcholine
Acetylcholine is a neurotransmitter that plays a crucial role in various
physiological functions, including muscle contraction, memory, and the
regulation of the autonomic nervous system. While acetylcholine is not as
prominently studied in the context of depression as serotonin, norepinephrine,
and dopamine, it does play a role in balancing the other chemical messengers.
Synthesis and Release: Acetylcholine is synthesized in nerve terminals
from choline and acetyl coenzyme A. After synthesis, acetylcholine is
stored in vesicles within the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a
cholinergic neuron, acetylcholine is released into the synapse (also known
as the cholinergic synapse). Acetylcholine binds to receptors on the
postsynaptic neuron, leading to various physiological responses.
Acetylcholine that remains in the synapse can be broken down by the
enzyme acetylcholinesterase, and the resulting products are taken back
up into the presynaptic neuron for recycling.
Receptors: Acetylcholine acts on two main types of receptors:
muscarinic receptors and nicotinic receptors. Muscarinic receptors are G
protein-coupled receptors, while nicotinic receptors are ligand-gated ion
channels. Both types of receptors are widely distributed throughout the
body and brain.
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Alterations in Neurobiological Functions
DEPRESSION
Introduction to Depression
Major depressive disorder is a mood disorder characterized by depressive
symptoms that last longer than 2 weeks. Though the exact cause is unknown,
depression can be influenced by genetic and environmental factors. Stressful
life events, such as giving birth or experiencing emotional trauma, can also
impact the development of depression. Recent research has tied depression to
decreased activity of the prefrontal cortex (Buelt, 2023). The prefrontal cortex
controls attention, memory, mood, and personality.
This learning module focuses on disease processes associated with depression
and enables you to meet the following course outcomes:
CO 1: Analyze pathophysiologic mechanisms associated with selected
disease states across the lifespan.
CO 2: Examine the way in which homeostatic, adaptive, and
compensatory physiological mechanisms can be supported and/or altered
through specific therapeutic interventions across the lifespan.
CO 3: Distinguish risk factors associated with selected disease states
across the lifespan.
CO 4: Integrate advanced pathophysiological concepts in the diagnosis
and treatment of health problems in selected populations.
Recognizing Depression
The nurse practitioner (NP) is discussing a client’s reason for seeking care.
Which client statements should the NP recognize as being associated with
depression? Select all that apply.
“I feel so hopeless, and everyone says I look sad.”
“Lately, I cannot seem to remember anything without writing it down.”
“My partner is frustrated because I can’t make decisions about our upcoming
vacation.”
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
“I have so much more energy these days.”
“Never in my life have I felt so worthless; I feel guilty about everything.”
---------------
Symptoms of depression can include difficulty making decisions, feeling
hopeless and sad, and feeling guilt or self-negativity.
Impaired recent and immediate memory or episodes of extreme energy are
not associated with major depressive disorders.
------------------
Tricyclic Antidepressants
The nurse practitioner (NP) prescribes a tricyclic antidepressant for a client
with newly diagnosed major depressive disorder (MDD). Which statement
should the NP include when providing client education?
“This medication will take 2–4 weeks to reach a therapeutic blood level.”
“Most clients notice a change in their mood within 36 hours after the first
dose.”
“Generally, 5–7 days are needed for the medication to start working.”
“Your symptoms should improve over the next 3–4 months.”
-----------
It takes 2 to 4 weeks for tricyclic antidepressants to reach a therapeutic blood
level.
Within 36 hours and 5 to 7 days are both too short for a therapeutic blood level
of the drug to be achieved. Improvement in depression should be
demonstrated sooner than 3 to 4 months.
---------------
Acetylcholine and Mood
Which statement best explains how acetylcholine impacts mood?
Acetylcholine regulates neural circuits in the hippocampus and prefrontal
cortex.
Acetylcholine targets both serotonin and norepinephrine systems.
Acetylcholine contributes to normal muscle contraction.
Acetylcholine binds to receptors on the presynaptic neuron.
--------
Acetylcholine is involved in regulating neural circuits associated with mood and
emotion, particularly in brain regions such as the hippocampus and prefrontal
cortex. Changes in acetylcholine levels or receptor function in these areas may
impact mood regulation and contribute to depressive symptoms.
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Acetylcholine's impact on muscle contraction is not related to its impact on
mood. Acetylcholine binds to postsynaptic (not presynaptic) neuron
receptors. Acetylcholine acts on two main types of receptors: muscarinic
receptors and nicotinic receptors.
-----
Normal Physiology of Serotonin and
Norepinephrine
Serotonin and norepinephrine are chemical messengers that, along with
dopamine and acetylcholine, play a crucial role in communication between
nerve cells (neurons) in the brain. These neurotransmitters are involved in
various physiological processes and are particularly relevant to the
understanding of depression. Click each section below to learn more about the
normal physiology of neurotransmitters.
Serotonin
Synthesis and Release: Serotonin is synthesized in the neurons from the
amino acid tryptophan. Once synthesized, serotonin is stored in vesicles within
the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a neuron,
serotonin is released into the synapse (the gap between neurons). After
release, some of the serotonin binds to receptors on the postsynaptic neuron,
transmitting the signal. The remaining serotonin is taken back up into the
presynaptic neuron through a process called reuptake, where it can be
recycled.
Receptors: Serotonin binds to specific receptors on the postsynaptic neuron.
There are various subtypes of serotonin receptors (e.g., 5-HT1, 5-HT2), and
their activation can have different effects on mood, emotion, and other
physiological functions.
Norepinephrine
Synthesis and Release: Norepinephrine is synthesized from the amino acid
tyrosine. Like serotonin, it is stored in vesicles in the nerve terminals.
Release and Reuptake: Upon a nerve impulse, norepinephrine is released
into the synapse. It then binds to receptors on the postsynaptic neuron. The
unbound norepinephrine is also subject to reuptake into the presynaptic
neuron for recycling.
Receptors: Norepinephrine primarily acts on adrenergic receptors, of which
there are alpha and beta subtypes. The activation of these receptors can have
various effects on mood, alertness, and other physiological responses.
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
, lOMoARcPSD|62982272
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
Dopamine
Dopamine is another important neurotransmitter in the brain, and it plays a
crucial role in various physiological processes, including mood regulation,
motivation, reward, and motor control. While dopamine is not as directly linked
to depression as serotonin and norepinephrine, it still plays a role in our
understanding of mood disorders.
Synthesis and Release: Dopamine is synthesized from the amino acid
tyrosine, and its synthesis takes place within the neurons. Once
synthesized, dopamine is stored in vesicles in the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a
neuron, dopamine is released into the synapse. Dopamine binds to
receptors on the postsynaptic neuron, transmitting the signal. Unbound
dopamine can be taken back up into the presynaptic neuron through
reuptake for recycling.
Receptors: Dopamine acts on several types of receptors, classified into
D1-like (including D1 and D5) and D2-like (including D2, D3, and D4)
receptors. The activation of these receptors can have different effects on
mood, motivation, and other physiological functions.
Acetylcholine
Acetylcholine is a neurotransmitter that plays a crucial role in various
physiological functions, including muscle contraction, memory, and the
regulation of the autonomic nervous system. While acetylcholine is not as
prominently studied in the context of depression as serotonin, norepinephrine,
and dopamine, it does play a role in balancing the other chemical messengers.
Synthesis and Release: Acetylcholine is synthesized in nerve terminals
from choline and acetyl coenzyme A. After synthesis, acetylcholine is
stored in vesicles within the nerve terminals.
Release and Reuptake: When a nerve impulse reaches the end of a
cholinergic neuron, acetylcholine is released into the synapse (also known
as the cholinergic synapse). Acetylcholine binds to receptors on the
postsynaptic neuron, leading to various physiological responses.
Acetylcholine that remains in the synapse can be broken down by the
enzyme acetylcholinesterase, and the resulting products are taken back
up into the presynaptic neuron for recycling.
Receptors: Acetylcholine acts on two main types of receptors:
muscarinic receptors and nicotinic receptors. Muscarinic receptors are G
protein-coupled receptors, while nicotinic receptors are ligand-gated ion
channels. Both types of receptors are widely distributed throughout the
body and brain.
Downloaded by elizabeth moses ()
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
week-5-alterations-in-neurobiological-functions-in-depression-mdd_removed.pdf
