Lyrics · 完整歌詞
Surgical decision-making begins before an operation is proposed,
by identifying the findings that meaningfully change diagnosis,
urgency or choice of treatment.
A thyroid nodule is sent first for a TSH,
because a suppressed value points to an autonomous hot nodule that rarely turns malignant.
A breast lump in a woman under 40 goes first to ultrasound,
because dense tissue defeats mammography.
The same discipline governs the abdomen: identify the indicator, sort the patient,
choose the operation, and anticipate its complications.
Bariatric procedures fall into three families defined by mechanism.
Sleeve gastrectomy, adjustable banding and vertical banded gastroplasty are purely restrictive.
Roux-en-Y gastric bypass combines restriction with malabsorption.
Biliopancreatic diversion with duodenal switch is predominantly malabsorptive;
it produces the greatest weight loss and the most severe nutritional deficiency.
Sleeve gastrectomy is now the most frequently performed operation worldwide,
yet severe reflux disease reverses that preference,
because a sleeve tends to aggravate reflux whereas bypass relieves it.
Surgical decision-making begins before an operation is proposed,
by identifying the findings that meaningfully change diagnosis,
urgency or choice of treatment.
These operations are called metabolic
because their effect is hormonal rather than merely mechanical.
After bypass or sleeve, nutrients reach the distal small bowel earlier,
so GLP-1 and PYY rise while ghrelin falls.
Consequently glycaemic control often improves within days, well before meaningful weight loss.
The benefit belongs to type 2 diabetes, in which beta cells survive;
it cannot rescue type 1 disease, where they have been destroyed.
Eligibility rests on a BMI of 40 or more,
or 35 or more with a comorbidity such as type 2 diabetes,
severe sleep apnoea or resistant hypertension.
Recent guidelines extend consideration to a BMI of 30 or more
when diabetes remains poorly controlled.
Psychological assessment is mandatory, not optional,
and a family decision cannot replace it.
The most serious early complication is an anastomotic or staple-line leak,
announced by fever, tachycardia and pain and usually requiring reoperation.
Lifelong supplementation of vitamin B12, iron, calcium, vitamin D and folate follows,
and dumping after bypass brings vasomotor symptoms within thirty minutes of sugary food.
The groin offers a second axis, this time defined by blood supply.
A reducible hernia is repaired electively;
an incarcerated hernia is trapped but perfused;
a strangulated hernia has lost its blood supply and demands immediate surgery.
Indirect hernias, the commonest and congenital,
pass through the deep ring lateral to the inferior epigastric vessels.
Direct hernias bulge through Hesselbach's triangle medial to those vessels.
Femoral hernias lie below the inguinal ligament, favour women,
and strangulate most often, so they are repaired once diagnosed.
The Lichtenstein tension-free mesh is the standard repair,
elective surgery waits at least six months after myocardial infarction,
and pain is the commonest early complication.
Surgical decision-making begins before an operation is proposed,
by identifying the findings that meaningfully change diagnosis,
urgency or choice of treatment.