L6: Abnormal Uterine Contractions Flashcards
Def of Abnormal Uterine Action
- Abnormality in contractile pattern of uterine musculature that prevents normal progress of labor.
Def of Contraction
- Shortening of muscle in response to stimulus e return to its original length when contraction has passed.
Defs in Abnormal Uterine Action
- Tonus
- Intensity
- Frequency
- Duration
- Uterine Activity
Abnormal Uterine Action
- Tonus
- Resting intrauterine pressure () contractions ( normally = 8- 12 mmHg)
Abnormal Uterine Action
- Intensity
- Increase in intrauterine pressure above tonus brought about by each contraction
- (normally = 40-80 mmHg in 1st stage & 100- 150 mmHg in 2nd stage).
Abnormal Uterine Action
- Frequency
- Number of contractions per 10 minutes (normally = 3 - 5 / 10 minutes).
Abnormal Uterine Action
- Duration
Duration of each contraction (normally = 60-80 sec).
Abnormal Uterine Action
- Uterine Activity
Intensity x frequency (it is expressed in Montevideo unit)
Physiological Criteria of Uterine Contractions
- Coordination
- Progressive
- Painful
- Polarity
- Retraction
- Involuntary
- Intermittent
- Effective
- Abolished by tocolytics
- Fundal Dominance
Physiological Criteria of Uterine Contractions
- Involuntary
Smooth muscle contraction out of control.
Physiological Criteria of Uterine Contractions
- Intermittent
Periods of contraction alternating e periods of relaxation.
Physiological Criteria of Uterine Contractions
- Painful
Causes of pain during uterine contractions
- Lower abdominal pain is related to activity in ….. & is present during ……
- UUS
- efficient labor
Back pain is related to tension in …… & ……
LUS & cervix
Physiological Criteria of Uterine Contractions
- Progressive
Increase Gradually in frequency, duration & intensity.
Physiological Criteria of Uterine Contractions
- Coordinated
Physiological Criteria of Uterine Contractions
- Fundal Dominance
- Maximum duration & intensity of contraction is at fundus (due to presence of pacemaker at cornu)
Physiological Criteria of Uterine Contractions
- Polarity
- When UUS contracts & retracts, LUS relaxes & dilates (actually, lower part contracts but much less than upper part).
Physiological Criteria of Uterine Contractions
- Retraction
- Shortening of muscle in response to stimulus but doesn’t return to its original length when contraction has passed.
- Retraction occurs in UUS & is responsible for fetal descent & control of postpartum bleeding.
Physiological Criteria of Uterine Contractions
- Effective (Fruitful)
Associated e cervical effacement & dilatation, descent of fetus & delivery of placenta.
Physiological Criteria of Uterine Contractions
- Abolished by ….
tocolytic Drugs
Methods of measurement of uterine activity during labor
- Clinical
- Electronic
Methods of measurement of uterine activity during labor
- Clinical
Methods of measurement of uterine activity during labor
- Electronic
External or internal tocodynamometer
Classification of Abnormal Uterine Action
Classification of Abnormal Uterine Action
- Normal Polarity
Classification of Abnormal Uterine Action
- With abnormal polarity (incoordinate uterine action)
Def of Hypotonic Uterine Inertia
Types of Hypotonic Uterine Inertia
Etiology of Hypotonic Uterine Inertia
CP of Hypotonic Uterine Inertia