Luyện nói tiếng Anh bằng Shadowing qua video: Pediatric Diarrhea – Pediatrics | Lecturio

So, what about a patient with diarrhea?

The definition of diarrhea is more than 10 cc's per kilo per day of fluid lost through stools.

That might be on a test.

I find it fairly useless in terms of a definition,

mostly because it's almost impossible to measure how many cc's per kilogram per day of stool is coming out of a child.

The leading cause of death worldwide in terms of morbidity and mortality in children is infectious diarrhea.

Rotavirus is a killer in the developing world.

In the United States, much less common

because we have a medical system where children can come and get help if they're feeling dehydrated.

Generally, we will define diarrhea as acute or chronic.

The vast majority of diarrhea is acute and it is less than two weeks prior to presentation.

If a patient has more than two weeks of duration of diarrhea, we will call that chronic

and we'll go through in a bit what the differences are in terms of etiologies of these various types of problems.

So let's go through types of diarrhea because this is important to understand and can sometimes show up on exams as well.

Secretory diarrhea is when intestinal epithelial cells are actively secreting water into the intra-intestinal compartment

and electrolytes are going along with it and through osmotic forces are causing water loss out into the stools.

The classic example here is cholera toxin.

It is extremely rare to encounter secretory diarrhea in children in developing countries.

Osmotic diarrhea is much more common.

This is generally because of ingested solutes

which are poorly absorbed causing water to get extruded into the intestinal compartment and then stooled out.

An example of this is a child who drinks too much juice.

Unfortunately, we see this a lot.

We sometimes even see children who are failing to thrive because of excessive juice consumption to reduce consumption.

So, children who eat large amounts of osmotic material will start to stool out.

Motality disorders can occur occasionally happen which can decrease transit time.

Generally, this is through bacterial overgrowth.

This is not too common.

Lastly, and especially in children with things like short gut syndrome,

patients may have decreased surface area and thus an inability to actually absorb material creating what is effectively an osmotic diarrhea.

Short gut syndrome is really common in some of our NICU graduates, especially those who have made it through an experience of surgical necrotizing enterocolitis.

So let's drill down into the causes of acute diarrhea.

By far and away the most common cause is infectious

and among infectious causes by far and away the most common is viral etiologies.

Viral illness used to be more in the spring with rotavirus outbreaks.

That's less common now because of the vaccination that we do.

So it now tends to be a little bit more in the summer and perhaps into the fall as well.

And of course in the winter we see some viral gastroenteritis as well.

Bacterial etiologies are not uncommon.

We see Campylobacter, E coli,

Salmonella, Shigella, even Yersinia and all of these can cause bloody stools.

In patients who have been exposed to antibiotics, you may see C difficile.

There may be systemic infections that are causing children to have acute diarrhea,

especially younger children who may just have that as a response to their general infection and parasites are possible, although more common in developing countries.

In older children, you may see that with food poisoning, although with food poisoning which is ingestion of a preformed toxin rather than the actual bacteria causing the problem,

more commonly patients have vomiting as well.

There are of course non-infectious causes of acute diarrhea.

Antibiotic associated diarrhea is common

with some antibiotics such as amoxicillin clavulinic acid

which may cause diarrhea in up to 40% of the patients who are taking the drug.

Hirschsprung toxic colitis is an unusual but important condition to know about.

I say non-infectious because the patient has an underlying problem with Hirschsprung's disease.

As you recall, and there is another lecture on Hirschsprung's,

patients will have a lack of ganglions in their rectal muscular tissue which causes them to be tonically constricted and get constipation.

However, if these patients get diarrhea, an acute viral gastroenteritis or bacterial gastroenteritis,

they can get very, very sick because the diarrhea has a hard time getting out

and bacteria can invade the intestinal wall and these patients can go into shock.

Neonates, and we're seeing more of this than ever before, are exposed to opium or opiates in utero and as they come out,

diarrhea is a common result of withdrawal from opiate exposure.

Patients with congenital adrenal hyperplasia will often have diarrhea at birth.

In older children, we again see the antibiotic-associated diarrhea.

appendicitis may cause diarrhea but it's more common that they have vomiting and abdominal pain.

Chronic diarrhea can also cause problems in children although it's much less rare than acute diarrhea.

Examples in both infants and older children include parasites

and abscesses around the appendix as in an old perforated appendix that's healed up and there have some residual diarrhea left over.

Patients may have malabsorption problems and again this will cause more of that osmotic diarrhea.

So examples would be post-infectious,

after their diarrhea, children can rub off the lactase in their intestinal wall and be transiently lactose intolerant.

Patients can have food protein intolerance or allergy.

Children can get cystic fibrosis, celiac disease, toddler's diarrhea.

In older children, we do see true lactose intolerance even though that's much rarer in the younger children and infants.

Adolescents who are trying to lose weight inappropriately may use laxatives.

Celiac disease and very, very rarely secretory neoplasms can cause a secretory diarrhea.

Of course, auto-inflammatory processes occur.

In younger children, we see eosinophilic gastroenteritis and in older children we would add in the potential diagnosis of inflammatory bowel disease.

All of these diseases are where children would have prolonged areas

of diarrhea going on for a long period of time

and you'd start to drill down into some of these diagnoses in such a patient.

Additionally, you may see children with immunodeficiency.

These children will usually get other infections as well, things like severe combined immune deficiency or HIV.

Again, adrenal insufficiently can cause this, as can hyper or hypoparathyroidism.

So, endocrinopathies can also cause chronic diarrhea.

Other problems can cause chronic diarrhea as well.

Rare things like lymphangiectasis in children, toxin exposure, and rarely congenital bowel disorders.

In older children, you may see constipation causing what appears to be diarrhea when in fact it's not.

It's just enkopresis, liquid stool squirting around the hard ball of stool that the child can no longer get out.

Irritable bowel syndrome starts to happen in older children and of course toxins can rarely cause this as well.

So if you see a child with vomiting and or diarrhea, what are key things you want to ask?

First is obviously fever.

Children with infectious diarrhea typically may have a fever.

Ask about blood or mucus in the stool.

This may tip you off that this is a bacterial as opposed to a viral pathogen.

Most bacterial gastroenteritis requiring treatment is bloody.

Ask about exposure to farm animals or reptiles.

This is actually a really important question

because a common cause of salmonella in children is reptile pets and a common cause of E coli

and especially the variety that causes hemolytic uremic syndrome is from farm animal exposure.

Petting zoos are a big problem in the United States

if children don't wash their hands with alcohol after they pet the animals.

100

Suspicious foods are always a potential cause and we hear about outbreaks all the time, for example, E coli and spinach.

101

This happens periodically and so when such a thing happened you might ask about suspicious

102

or also undercooked foods things like uncooked eggs which might show up in raw cookie dough.

103

Ask about recent travel.

104

Recent travel is important because there are some causes of diarrhea

105

that are unusual in the United States that may be more prevalent in developing countries.

106

And of course, ask about recent antibiotic use because C diff is a possibility as well as antibiotic associated diarrhea.

107

So on exam, critically important to look for signs of dehydration.

108

Tenting is rare and is only at extreme ends of dehydration.

109

Mostly you're going to look at mucous membranes and see if they're moist.

110

See if the child is making tears when they cry.

111

Look for signs of systemic infection.

112

Is there something else going on?

113

The abdominal exam is critical, especially looking for rebound, guarding, things like that where the child doesn't want you pressing on their abdomen.

114

In babies, this can be tricky.

115

The baby, if you're careful, will seem to resist you if you squeeze on their belly.

116

But in a crying baby who doesn't want to be examined in the first place, this can be a challenge.

117

A perianal inspection is important on children, especially if you're concerned about inflammatory bowel disease.

118

Sometimes a rectal tag or fissure is the best clue you have that the child has Crohn's disease.

119

So what lab work would you get?

120

Again, serum electrolytes.

121

You might get stool bacterial cultures.

122

The question is, is this cost effective?

123

Because the reality is the vast majority of bacterial enteritis we do not treat with antibiotics.

124

They get better on their own.

125

In fact, there is some evidence that the varieties of E coli

126

that cause hemolytic uremic syndrome may be more likely to cause hemolytic uremic syndrome if treated.

127

We really reserve treatment of bacterial enteritis for Shigella, Salmonella that's severely bad or in children under three months of age,

128

or a child who simply isn't getting better from their bacterial enteritis.

129

There is now emerging stool PCR panels that are very effective at picking up a variety of illnesses that can cause gastroenteritis.

130

These panels are available through rectal swab or through stool collected and sent to the lab.

131

Right now the cost for these panels is very high.

132

At our hospital it costs upwards of $800.

133

So it's important to have a very good reason why you're getting this test.

134

If it's preventing a child from going to the operating room for endoscopy, it's probably worth it.

135

But if it's just to see what it is, it might not be.

136

Waiting for the child to get better may be your best option.

137

Stool microscopy for ovum parasites may be effective in a child who you suspect has an ovum parasite.

138

However, remember this is also costly.

139

It's labor intensive in the lab.

140

And so don't send it on every patient.

141

Really limit it to patients where you strongly suspect a parasite.

142

For example, someone who's recently been abroad.

143

If you're suspecting hemolytic uremic syndrome, and we will talk about that more in another lecture,

144

It's critically important to assess renal function, to test for E coli 0157H7

145

and of course to get a CBC to look for thrombocytopenia and anemia.

146

If you suspect failure to thrive in a child, the child is not gaining weight and this is associated with prolonged diarrhea,

147

it's important to consider cystic fibrosis.

148

Tests we can get include stool elastase, but the cheapest test and the easiest test is simply a sweat test.

149

For inflammatory bowel disease patients, we might check for elevated inflammatory markers, such as the ESR, the SED rate,

150

or the CRP, but remember that those tests may be normal even during an inflammatory bowel disease flare.

151

Probably the best test we can get is the fecal calprotectin or tectin.

152

For patients where we suspect malabsorption, a child with for example, edema, who might have a low protein level causing them to be edematous,

153

it can be done that we can check for things like stool reducing substances, which would check for sugar,

154

fecal fat, or alpha-1-anytrypsin in the stool.

155

If we suspect immunodeficiency, of course getting an HIV test should be on everyone's priority

156

as well as checking for lymphocyte counts and looking at their immunoglobulin profile.

157

So if we have a patient who has prolonged diarrhea and emesis and we, despite all those labs, cannot figure out what's going on,

158

we will usually proceed to endoscopy or colonoscopy depending on which side has the problem.

159

So examples of this would be a child where we suspect

160

inflammatory bowel disease these children really endoscopy is the best way to make that diagnosis.

161

If there's an unclear cause of malabsorption, we'll do endoscopy to try and figure out what's going on.

162

Sometimes the biopsies can show us a problem with the brush border in the colon, for example, which may give us a clue as to what's going on

163

and why that child is not able to absorb nutrients.

164

In patients with celiac disease, we think about getting the TTG and the IgA levels from the blood.

165

And that is how we can make a presumptive diagnosis.

166

But most physicians will want an actual biopsy of the intestine wall to verify

167

that that's the diagnosis because the diagnosis of celiac disease is a tough one to give to a patient.

168

Remember, they have to change their diet for the rest of their lives.

169

Obviously, in any patient with a severe GI bleed, we want to go to endoscopy to try and stop the bleed.

170

Remember, GI bleeds can happen very quickly and can be very severe and life-threatening.

171

Lastly, certainly if we suspect suspicion for enteric disease, such as eosinophilic esophagitis or eosinophilic gastritis,

172

a biopsy is necessary to truly make that diagnosis.

173

Also, visualization of the enteric wall may give us clues as to what's going on.

174

So that's my summary of everything that has to do with children who are vomiting or have diarrhea.

175

And it's a good overview for you to keep in mind as we delve into more of these diseases in further lectures.

176

Thanks for your time.

177

you

Phương Pháp Shadowing Là Gì?

Shadowing là kỹ thuật học ngôn ngữ có cơ sở khoa học, ban đầu được phát triển cho chương trình đào tạo phiên dịch viên chuyên nghiệp và được phổ biến rộng rãi bởi nhà đa ngôn ngữ học Dr. Alexander Arguelles. Nguyên lý cốt lõi đơn giản nhưng cực kỳ hiệu quả: bạn nghe tiếng Anh của người bản xứ và lặp lại to ngay lập tức — như một "cái bóng" (shadow) đuổi theo người nói với độ trễ chỉ 1–2 giây. Khác với luyện ngữ pháp hay học từ vựng bị động, Shadowing buộc não bộ và cơ miệng phải đồng thời xử lý và tái tạo ngôn ngữ thực tế. Các nghiên cứu khoa học xác nhận phương pháp này cải thiện đáng kể phát âm, ngữ điệu, nhịp điệu, nối âm, kỹ năng nghe và độ lưu loát khi nói — đặc biệt hiệu quả cho người luyện IELTS Speaking và muốn giao tiếp tiếng Anh tự nhiên như người bản ngữ.

Luyện nói tiếng Anh bằng Shadowing qua video: Pediatric Diarrhea – Pediatrics | Lecturio

Bối Cảnh & Nền Tảng

5 Câu Nói Quan Trọng Trong Giao Tiếp Hàng Ngày

Hướng Dẫn Shadowing Bước Từng Bước

Phương Pháp Shadowing Là Gì?