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🧵 Kshar Sutra - Everything You Must Know

What is Kshar Sutra?

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Historical Background

• First described by Acharya Sushruta in the Sushruta Samhita under the chapter on Bhagandara (fistula-in-ano)
• Re-popularized in modern times by Prof. P.J. Deshpande at Banaras Hindu University (BHU) in the 1960s-70s
• Validated by the Indian Council of Medical Research (ICMR) through multicentre trials
• Recognized by the Ministry of AYUSH as a standard treatment protocol

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The Thread: Composition & Preparation

Three Key Ingredients

21-Coating Protocol

Coats 1-11:   Snuhi Ksheera alone (11 coats)
Coats 12-18:  Snuhi Ksheera + Apamarga Kshar (7 coats)
Coats 19-21:  Snuhi Ksheera + Haridra Churna (3 coats)

1. Wet the linen thread with Snuhi latex
2. Roll/pass through the powdered drug
3. Ensure uniform adherence, shake off excess
4. Place in UV-sterilized Kshar Sutra cabinet for drying
5. Repeat after complete drying
6. Final thread: cut to 30-32 cm, packed in sterilized packaging

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Mechanism of Action (Trividha Karma)

1. Chedana (Cutting)

2. Lekhana (Scraping/Curetting)

3. Ropana (Healing)

• Antibacterial activity (inhibits E. coli, S. aureus)
• Promotes fibroblast proliferation
• Reduces inflammation
• Enables simultaneous healing as the tract is being cut

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Indications

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Step-by-Step Procedure

For Fistula-in-Ano (Most Common)

1. Anesthesia: Local/spinal/general anesthesia given
2. Proctoscopy: Assess the fistula tract - determine internal and external openings
3. Probe insertion: A malleable metal probe (Shalaka) is passed through the external opening, traversing the tract to the internal opening
4. Thread passage: The Kshar Sutra is inserted into the groove of the probe and pulled through the tract
5. Tying: Both ends of the thread are tied together with a moderate amount of tension to form a loop through the tract
6. Weekly change: The thread is changed every 7 days with a new Kshar Sutra using the rail-road technique (Lekhana method) - old thread tied to new thread, pulled through
7. Duration: Continues until the entire tract is cut and healed - typically 6-8 weeks for simple fistulas, longer for complex ones

Length of tract (cm) ÷ UTS (cm/week) = approximate treatment duration in weeks

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For Hemorrhoids (Piles)

1. Patient placed in lithotomy position under anesthesia
2. Pile mass held with forceps, prolapsed from anal orifice
3. Episiotomy at the mucocutaneous junction
4. Pile mass gently pulled; Kshar Sutra transfixed at its base
5. Ligated pile mass repositioned into rectum
6. Yastimadhu taila (licorice oil) or ghrita applied for soothing
7. The thread strangulates and sloughs off the pile mass within 5-7 days

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For Pilonidal Sinus

1. Thread passed through the sinus tract opening to skin surface
2. Tied together in a loop
3. Changed weekly - same cutting and healing mechanism applies

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For Anal Fissure

1. Done under local anesthesia
2. Kshar Sutra placed at the appropriate location to release hypertonic internal anal sphincter
3. In some cases, used to excise the hypertrophied anal papilla or sentinel tag
4. Releases sphincter spasm while chemically healing the fissure edge

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Advantages Over Conventional Surgery

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Contraindications

• Acute anorectal sepsis/abscess (treat first, then Kshar Sutra)
• Active inflammatory bowel disease (Crohn's, UC) - relative contraindication
• Immunocompromised patients (HIV, uncontrolled diabetes)
• Coagulation disorders
• Pregnancy (relative)
• Malignant fistula

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Post-Procedure Care & Do's/Don'ts

Do's

• Sitz bath (warm water) twice daily
• High-fiber diet to avoid constipation
• Adequate hydration (2-3 liters/day)
• Regular Triphala churna / mild laxatives as advised
• Keep the area clean and dry
• Report promptly if the thread falls out

Don'ts

• Avoid spicy, fried, non-vegetarian food
• Avoid straining during defecation
• Avoid prolonged sitting on hard surfaces
• Avoid strenuous exercise for initial 2-3 weeks
• Do not miss weekly thread changes

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Complications

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Key Pharmacological Properties of Ingredients

Snuhi Ksheera (Euphorbia latex)

• Contains diterpene esters (phorbol esters) - caustic
• Binds the drugs to the thread
• Enhances penetration of Kshar into tissue

Apamarga Kshar (Achyranthes aspera ash)

• Main active agent: potassium carbonate + potassium hydroxide
• pH ~10-12 (strongly alkaline)
• Causes protein denaturation and chemical cutting
• Bacteriostatic due to high pH

Haridra (Turmeric / Curcuma longa)

• Active constituent: Curcumin
• Anti-inflammatory (inhibits COX-2, NF-kB pathway)
• Antibacterial (gram +ve and -ve organisms)
• Promotes fibroblast activity and collagen synthesis
• Antioxidant

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Classification of Kshar Sutra

1. Standard Kshar Sutra - 21 coatings as above (most used)
2. Haridra Sutra - additional turmeric coatings for more healing emphasis
3. Nimba Sutra - neem-based (antibacterial emphasis)

• API (Ayurvedic Pharmacopoeia of India) grade Kshar Sutra - standardized preparation

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Evidence Base

• ICMR multicentre trial (1991) - landmark study showing 96.7% success rate in fistula-in-ano vs. 87.5% with conventional surgery, with significantly lower recurrence (3.3% vs 11.4%)
• Studies in journals like Ancient Science of Life, Journal of Ayurveda and Integrative Medicine, and International Surgery
• Pilonidal sinus trials showing 95%+ cure rates
• Recognized in national surgical guidelines by Ministry of AYUSH

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Quick Clinical Summary

Kshar Sutra = alkaline medicated thread | 21 coats | snuhi + apamarga kshar + haridra | primary use: fistula-in-ano | mechanism: cuts + scrapes + heals simultaneously | changed weekly | ~1 cm/week cutting rate | minimal sphincter damage | recurrence <4%

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🩹 Types of Bandage - Ayurveda (Bandha Vidhi) vs Modern: Complete Comparison with Images

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Introduction

• Sushruta Samhita, Sutrasthana, Chapter 18 - describes 14 types of Bandha
• Ashtanga Hridayam (Vagbhata) - adds 1 more (Utsangi Bandha) making a total of 15 types

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Purposes of Bandaging (Bandha Prayojana)

1. Vrana Dharana (holding dressing in place)
2. Shonita Sthapana (hemostasis)
3. Samhanana (compression/approximation of wound edges)
4. Sheeta Vata Raksha (protection from cold air)
5. Kleda Shosha (absorption of discharge)
6. Vedana Shaman (pain relief)
7. Dosha Samshodhana (removing toxic material)
8. Vrana Ropana (wound healing)
9. Bala Vardhana (strengthening the part)
10. Manorama Darshana (cosmetic appeal)

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Bandhana Dravya (Materials for Bandaging)

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Classification of Bandha (Sites/Types)

1. Dridha Bandha (firm bandage) - for extremities and fractures
2. Mridhu Bandha (soft bandage) - for face, eyes
3. Shithila Bandha (loose bandage) - for joints and eyes

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The 14 Types of Bandha - Detailed Comparison

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1. KOSHA BANDHA (Sheath/Finger Bandage)

"Kosha means pocket or purse - the finger is slipped into it like a sword into its sheath"

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2. DAMA BANDHA (Sling/Four-Tailed Bandage)

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3. SWASTIKA BANDHA (Cross/Spica Bandage)

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4. ANUVELLITA BANDHA (Spiral Bandage)

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5. PRATOLI / MUTOLI BANDHA (Winding/Circular Bandage)

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6. MANDALA BANDHA (Circular/Abdominal Binder)

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7. STHAGIKA BANDHA (Stump Bandage)

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8. YAMAKA BANDHA (Twin Bandage)

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9. KHATVA BANDHA (Fracture-Cot/Splint Bandage)

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10. CHEENA BANDHA (Chinese/Eye Bandage)

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11. VIBANDHA BANDHA (Broad/Suspensory Bandage)

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12. VITANA BANDHA (Canopy/Tent Bandage)

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13. GOPHANA BANDHA (T-Bandage / Sling)

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14. PANCHANGI BANDHA (Five-Tailed Bandage)

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BONUS: UTSANGI BANDHA (Vagbhata's addition - 15th type)

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Master Comparison Table: All 14+1 Bandhas

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Key Insights: Ayurveda vs Modern

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Practical Shloka Reference (Sushruta Samhita 18/18)

"कोशमङ्गुष्ठाङ्गुलिपर्वसु विदध्यात्" (Kosha bandage for thumb, fingers and their joints)

"दाम सम्बाधेऽङ्गे" (Dama bandage for congested/difficult-to-bandage parts)

"स्वस्तिकं सन्धिषु" (Swastika bandage for joints)

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👁️ Spherical & Cylindrical Lenses + Trial Frame - Complete Viva Guide

Guyton & Hall Textbook of Medical Physiology, Ch. 50 + Clinical Optometry references

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PART 1: LENS - DEFINITION & BASICS

What is a Lens?

D = 1 / f(in meters) A lens of focal length 1 meter = 1 Dioptre

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PART 2: SPHERICAL LENSES - Complete Viva

Definition

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Types of Spherical Lenses

1. CONVEX (Positive / Plus) Spherical Lens

2. CONCAVE (Negative / Minus) Spherical Lens

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Viva Q&A - Spherical Lenses

A lens that has equal curvature in all meridians; it refracts light uniformly to produce a single point focus.

D = 1/0.5 = +2.00 D (convex) or -2.00 D (concave)

One surface is flat (plano) and the other is convex. Power is less than biconvex of the same diameter but creates less aberration.

Has one convex and one concave surface. Converging meniscus (convex > concave) and diverging meniscus (concave > convex). Used in spectacles to reduce aberrations.

Its focal length = 1/3 = 33.3 cm. It converges parallel rays to a point 33.3 cm behind the lens.

By a concave (minus) spherical lens that diverges rays, moving the focal point backward onto the retina.

By a convex (plus) spherical lens that converges rays, bringing the focal point forward onto the retina.

The point through which a ray passes without any deviation. It is the geometric centre of the lens.

The bending of light rays by a lens. Expressed in dioptres. Positive vergence = converging; negative vergence = diverging.

Approximately 7 mm behind the cornea (near the posterior lens surface). Light rays passing through the nodal point are not deviated.

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PART 3: CYLINDRICAL LENSES - Complete Viva

Definition

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The KEY Difference: Sphere vs Cylinder

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Axis and Power Meridian

       90°
        |
180° ---+--- 0°  (axis marking: 0°-180°)
        |
       270°

• Axis meridian = direction along which there is NO power (no curvature)
• Power meridian = 90° to the axis = maximum curvature = where lens acts

• No power along 90° direction
• +2D power along 0° (horizontal) direction

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Types of Cylindrical Lenses

1. CONVEX (Plus) Cylinder

• Thicker in the middle along the power meridian
• Converges light in the power meridian
• Creates a focal line parallel to the axis
• Used to correct: simple hyperopic astigmatism, compound astigmatism

2. CONCAVE (Minus) Cylinder

• Thinner in the middle along the power meridian
• Diverges light in the power meridian
• Used to correct: simple myopic astigmatism, compound astigmatism
• Preferred in UK/many countries (minus cylinder convention)

3. PLANO-CYLINDRICAL Lens

• One flat surface + one cylindrical surface
• Used in trial lens sets
• The flat (plano) surface faces outward; curved surface faces the eye

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Astigmatism - The Clinical Basis of Cylindrical Lenses

• The cornea curves more steeply in one meridian than another (like the surface of an egg)
• This means two different focal planes exist
• A cylindrical lens corrects the power difference between the two meridians

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Viva Q&A - Cylindrical Lenses

A lens curved in one meridian only; it acts as a prism in the power meridian and as a flat glass in the axis meridian. It creates a line focus instead of a point focus.

The axis is the meridian along which the cylindrical lens has NO power (zero curvature). Marked from 0° to 180°. It determines the orientation of the cylinder correction.

Because a spherical lens corrects equally in all meridians. In astigmatism, different meridians need different corrections - only a cylindrical lens can selectively correct one meridian without affecting the other.

A combination of a spherical and cylindrical lens in one - it has different curvatures in different meridians, like the surface of a torus (donut shape). Used for astigmatism correction in spectacles and contact lenses.

A combined lens that has both spherical and cylindrical components. Written as: Sphere / Cylinder × Axis. Example: -2.00 / -1.00 × 90°

Transposition rule:

1. Add sphere + cylinder = new sphere
2. Change sign of cylinder (plus → minus or vice versa)
3. Axis: add or subtract 90° (stay between 0-180°)

Example: +2.00 / +1.00 × 90° → becomes +3.00 / -1.00 × 180°

Vertical meridian has greater curvature (more power). Plus cylinder axis at 90° (or minus cylinder axis at 180°). Most common in young patients.

Horizontal meridian has greater curvature. Plus cylinder axis at 180° (or minus cylinder axis at 90°). More common in older patients (corneal changes with age).

A cylindrical lens with multiple parallel cylinders arranged side by side. Converts a point source of light into a streak/line - used to detect and measure heterophoria (latent squint).

A special lens consisting of two cylinders of equal power but opposite sign (e.g., +0.25 DC and -0.25 DC) with their axes at 90° to each other. Used to:

• Refine the axis of astigmatism
• Refine the power of the cylindrical correction
• Marked with a red dot (minus axis) and white dot (plus axis)

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Optical Cross Concept

For a -2.00 / -1.00 × 90°:

           90°
           |
     -3.00 D (power at 180° meridian)
    _________|_________
           |
     -2.00 D (power at 90° meridian)
           |
          180°

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PART 4: TRIAL FRAME - Complete Concept

What is a Trial Frame?

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Parts of a Trial Frame

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Compartments of the Trial Frame

Why innermost = high powered? Because vertex distance errors are minimized when the strongest lens is closest to the eye (Vertex Distance compensation)

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Types of Trial Frames

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PART 5: TRIAL LENS BOX - Complete Breakdown

The Standard 266-Piece Trial Lens Set

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How Many Lenses? - Breakdown by Category

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Spherical Lens Power Steps (Increments)

+0.12 D and +0.25 D (just these two at the lowest end)
+0.25 → +4.00 D:   in 0.25 D steps
+4.00 → +6.00 D:   in 0.50 D steps
+6.00 → +14.00 D:  in 1.00 D steps
+14.00 → +20.00 D: in 2.00 D steps
(Same increments for minus spheres)

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Types of Trial Lenses: Optical vs Accessory

A. OPTICAL LENSES (for refractive error correction)

• Biconvex or biconcave
• Larger, heavier
• Can cause prismatic errors if not well-centered
• Used in most standard refractions

• Plano-convex or plano-concave
• Lighter, thinner
• Less prismatic error
• For refraction: curved surface faces the eye
• For neutralization: curved surface faces the other lens

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B. ACCESSORY LENSES / TOOLS

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Prism Lenses - Quick Viva Points

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PART 6: SUMMARY VIVA TABLE

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PART 7: QUICK CLINICAL FORMULA CARDS

LENS POWER:   D = 1/f     (f in metres)

TRANSPOSITION (Plus to Minus Cyl):
  New sphere = Old sphere + Old cylinder
  New cylinder = same power, opposite sign
  New axis = Old axis ± 90°

PRENTICE'S RULE:   Δ = D × d
  (Δ = prism dioptres; D = lens power; d = decentration in cm)

VERTEX DISTANCE CORRECTION (>±4D needs correction):
  F_corrected = F_spectacle / (1 - d × F_spectacle)
  d = vertex distance in metres

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High-yield exam tip: The most commonly asked viva triad is:

1. What corrects myopia? - Concave spherical (minus)
2. What corrects hypermetropia? - Convex spherical (plus)
3. What corrects astigmatism? - Cylindrical lens (with correct axis and power)