First Trimester Bleeding: Ectopic Pregnancy, Abortions, and Gestational Trophoblastic Diseases

Overview of First Trimester Bleeding Complications

Bleeding during the first trimester of pregnancy is a critical complication that threatens the lives of both the mother and the fetus. It stands as one of the most significant causes of maternal mortality worldwide. While pregnancy is often viewed as a physiological process, every pregnancy carries relative risks. Approximately $15\%$ of pregnant women encounter these potentially life-threatening complications, which necessitate professional medical and nursing care. The primary objectives in managing all pregnancy complications remain early diagnosis of risks, timely preventive applications, the immediate execution of necessary interventions when complications arise, and ensuring the pregnancy concludes with both a healthy mother and baby.

First trimester bleeding encompasses several specific conditions, primarily ectopic pregnancy, various forms of abortions (miscarriages), and gestational trophoblastic diseases. Other causes include implantation bleeding and infections. Maternal complications caused by pregnancy more broadly include ectopic pregnancy, abortions, multiple pregnancies, blood incompatibility, placenta previa, placenta accreta, placental abruption, and gestational trophoblastic diseases. Understanding these conditions is vital for providing effective midwifery care, which plays a central role in patient outcomes.

Ectopic Pregnancy: Definition and Pathophysiology

An ectopic pregnancy occurs when a zygote implants in a region outside the uterine cavity. The incidence rate of ectopic pregnancy is approximately $1-2\%$. The most common site for this abnormal implantation is the fallopian tubes, specifically within the ampulla section. Statistically, $95\%$ of ectopic pregnancies are located in the fallopian tubes, $4\%$ occur in the ovaries, and less than $1\%$ are situated in the cervix. The duration and ultimate outcome of the pregnancy depend largely on the specific localized area within the fallopian tubes.

Cervical pregnancy is a specific type where the embryo implants into the endocervical canal below the level of the internal cervical os. This condition is a significant cause of maternal morbidity and mortality because it can lead to severe, life-threatening hemorrhage. The diagnosis and treatment of cervical ectopic pregnancy are critical not only for saving the mother's life but also for the preservation of her future fertility.

Tubal Pregnancy Dynamics and Effects

Tubal pregnancy is the most frequently encountered form of ectopic pregnancy. It may develop due to scar tissue from previous infections or surgeries, or because of intra-abdominal tumors. Furthermore, fluctuations in levels of estrogen, progesterone, prostaglandins, or catecholamines can interfere with the normal motility of the fertilized ovum within the tube. For example, a low progesterone level can weaken the propulsive force of the fallopian tubes, hindering the embryo's progress to the uterus.

Several characteristics define the tubal environment during an ectopic pregnancy. The fallopian tube offers minimal resistance to trophoblastic tissue growth, and because the tubes have a very low muscle mass, their ability to stretch is strictly limited. Additionally, the pressure in the tubal arteries is higher than that in the uterine arteries. Because the decidual reaction is limited in the tubes, the amount of $\beta\text{-hCG}$ produced is lower, which often results in sparse or limited pregnancy signs and symptoms. These characteristics lead to specific outcomes: spontaneous regression, gestational-stage abortion, or rupture at the implantation site. If a spontaneous abortion does not occur, ampullary or tubal pregnancies generally result in rupture due to pressure from ruptured blood vessels or tubal contractions.

Clinical Manifestations and Treatment of Ectopic Pregnancy

Ectopic pregnancies typically present as oval masses of varying sizes located in the parauterine region; an embryo is rarely recognizable within the gestational sac. Early symptoms mimic early pregnancy, including amenorrhea, breast changes, and nausea. Pain is a hallmark symptom, often manifesting as unilateral or bilateral lower abdominal pain. In the event of a rupture, the patient experiences sudden, sharp pain that spreads toward the lower abdomen. Unilateral pain is usually a blunt sensation caused by tubal stretching.

Vaginal discharge in ectopic pregnancy is typically continuous and may be brown or red. This bleeding occurs either because blood passes from the tube to the uterus or because the decidua breaks down due to embryonic death. If a rupture occurs into the abdominal cavity, the patient may experience shoulder pain when lying flat due to phrenic nerve irritation. Other signs include the presence of blood in the Douglas pouch (confirmed via aspiration), an enlarged uterus on bimanual examination, adnexal tenderness, a drop in blood pressure, hemoglobin, and erythrocyte values, as well as leukocytosis and high fever.

Treatment depends on whether the tube has ruptured. If the tubal pregnancy is unruptured and caught early, medikal treatment using the drug Methotrexate may be used to eliminate the pregnancy product without surgery, preserving the tube's integrity. For ruptured pregnancies, surgery is required to remove the affected section of the tube, especially if the patient is in hypovolemic shock. For cervical pregnancies, surgery is the last resort, while abdominal ectopic pregnancies must be removed surgically as soon as they are diagnosed. If bleeding cannot be controlled, a hysterectomy becomes a life-saving necessity.

Midwifery Care and Management for Ectopic Pregnancy

Midwifery care involves close monitoring of the patient's fertility status and psychological health. Patients at risk must be evaluated carefully for signs of ectopic pregnancy. Care steps include explaining the situation to the patient, monitoring vital signs, tracking bleeding, and maintaining an intake-output record. Signs of shock must be observed constantly. If the patient is Rh-negative, RhoGAM must be administered to protect future pregnancies. Patients should be guided through breathing and relaxation exercises to manage pain, and prescribed analgesics should be administered.

While undergoing medical treatment, patients must be followed until their $\beta\text{-hCG}$ values reach zero. They must avoid alcohol and sexual intercourse until the risk of rupture or medication side effects decreases. Because certain medications cause photosensitivity, patients should avoid sun exposure. They must also avoid aspirin and non-steroidal anti-inflammatory drugs (NSAIDs) to prevent exacerbating gastrointestinal effects. Hygiene is paramount to prevent infection, and emotional support for the patient and family is essential, especially since the patient remains at risk for recurrence in future pregnancies.

Classification and Pathophysiology of Abortions

An abortion, or miscarriage, is defined as the termination of a pregnancy before the fetus has gained the ability to survive outside the uterus. Fetuses born before the $20^{th}$ week of pregnancy or weighing $500\,g$ or less are categorized as abortions. Early abortions occur before the $12^{th}$ week, while late abortions occur between the $12^{th}$ and $20^{th}$ weeks. The frequency of spontaneous abortions seen clinically is approximately $15-20\%$. About $10\%$ of pregnancies end in spontaneous abortion within the first $12$ weeks, often appearing only as a delayed menstruation with heavier-than-normal bleeding before the woman even knows she is pregnant.

Spontaneous abortions result from a sequence of events usually starting with the death of the embryo or a defect in the normal development of the embryo or placenta. Following this, estrogen and progesterone levels drop, causing decidual separation and subsequent vaginal bleeding. The uterus becomes sensitive, and uterine contractions begin. In some cases, a deficient cervix—characterized by more smooth muscle and less collagen than a normal cervix—leads to reduced cervical resistance. This deficiency is often caused by a collagen defect or previous cervical trauma.

Clinical Types of Spontaneous Abortions

Abortus Imminens (Threatened Abortion) involves vaginal bleeding in the first half of pregnancy, ranging from brown discharge to bright red blood. It may be accompanied by cramp-like pain, but the cervix remains closed. Management includes $48$ hours of bed rest, sedation, Fetal Heart Sound (FHS) monitoring, and the avoidance of sexual intercourse. Abortus Insipiens (Inevitable Abortion) occurs when bleeding and pain are accompanied by cervical dilation, making the completion of the abortion unavoidable. Management requires bed rest, monitoring for fetal tissue in discharge, and preparing for potential surgery by keeping the patient NPO (no food or drink) and collecting blood samples for cross-matching.

Complete Abortus (Finished Abortion) describes the state where all pregnancy-related tissues are expelled. Bleeding and pain cease, and the cervix closes. This is most common before the $6^{th}$ week or after the $14^{th}$ week. Incomplete Abortus (Unfinished Abortion) occurs when only some tissues are expelled while a significant portion remains in the uterus. This leads to severe pain, heavy bleeding, a dilated cervix, and an increased risk of infection. It is common between the $8^{th}$ and $14^{th}$ weeks and requires curettage to ensure no pieces remain. Missed Abortus (Missed Abortion) is when the embryo dies but is not expelled. Amenorrhea continues, though some brown discharge may occur. Signs of pregnancy disappear, the pregnancy test turns negative, and FHS cannot be heard. There is a risk of disseminated intravascular coagulation (DIC), as fibrinogen and platelet levels decrease. Evacuation is required via suction (if $<14$ weeks) or prostaglandin/oxytocin induction (if $>14$ weeks).

Habitual, Septic, and Induced Abortions

Habitual Abortus (Recurrent Abortion) is defined as three or more consecutive spontaneous abortions. Causes include chromosomal abnormalities, uterine defects, cervical insufficiency, luteal phase defects, endometrial infections, or autoimmune factors. Septic Abortus (Criminal Abortion) occurs when the uterine cavity becomes infected alongside the pregnancy products. This often results from illegal abortions or the insertion of foreign objects (such as broom straws, soap, matches, safety pins, or nettles) into the vagina or cervix to induce miscarriage. Symptoms include high fever, tachycardia, and pelvic pain. Management involves antibiotics based on cultures and curettage once the patient is stabilized.

Induced abortions are categorized into three groups. Therapeutic Abortus is performed for medical reasons, such as risks of severe fetal deformity, mental retardation, or if the mother's life is endangered by conditions like advanced heart disease, severe hypertension, or invasive cervical cancer. It is also considered in cases of rape or incest. Elective Abortus is the legal termination of an unwanted pregnancy based on the parents' wishes. Criminal Abortus refers to terminations performed outside of health institutions by non-physicians or via traditional methods, often leading to severe septic complications due to unhygienic environments.

Gestational Trophoblastic Disease (GTD)

Gestational trophoblastic diseases (GTD) result from the irregular proliferation and degeneration of trophoblastic cells. These conditions begin as benign hydatidiform moles and can progress to malignant choriocarcinoma. GTD occurs in approximately $1/1000$ pregnancies. In Turkey, the incidence is recorded as $0.3-16.0/1000$ pregnancies or $1.0-24.5/1000$ births. Histologically, GTD is classified into several types, primarily starting with the hydatidiform mole, which involves the benign proliferative development of the trophoblast where chorionic villi transform into transparent, grape-like vesicles.

Mole Hidatiform: Complete and Incomplete Types

A Complete Mole develops from an ovum that lacks maternal genetic material (an "empty egg"). In most cases, a haploid sperm ($23,X$) fertilizes this empty egg, and the chromosomes duplicate before the first cell division, resulting in a $46,XX$ karyotype of entirely paternal origin. No embryo is present. Chorionic villi become hydropic vesicles ($1-3\,cm$ in diameter), resembling a bunch of grapes. Trophoblasts proliferate excessively, causing extremely high hCG levels. The uterus often grows faster than expected for the gestational age, and FHS are absent. Patients often present with vaginal bleeding and the spontaneous passage of vesicles.

An Incomplete (Partial) Mole has a triploid karyotype ($69$ chromosomes), usually resulting from the fertilization of a normal ovum by two sperm or a sperm with failed first meiosis. Unlike the complete mole, a recognizable fetus and amniotic membranes are often present, and the fetus may remain alive for $8-9$ weeks. hCG levels are not as high as in complete moles. This type may follow a spontaneous abortion or be diagnosed only after a miscarriage.

Invasive Mole, Choriocarcinoma, and GTG Management

An Invasive Mole (Chorioadenoma Destruens) is similar to a complete mole but invades the myometrium of the uterus. It is usually diagnosed within six months of mol evacuation. If untreated, it can cause uterine perforation, hemorrhage, and metastasis through vascular spread. Choriocarcinoma is a rare but highly malignant neoplasm ($1/25,000-40,000$ incidence). It occurs following a molar pregnancy ($50\%$), abortion ($25\%$), normal pregnancy ($22\%$), or rarely, ectopic pregnancy. It presents with uterine bleeding and high hCG months after pregnancy. The lungs are the most common site of metastasis ($90\%$).

Classic symptoms of molar pregnancy include vaginal bleeding (dark brown or prune-juice colored), anemia, a disproportionately large uterus, and the absence of FHS. High hCG levels lead to hyperemesis gravidarum and early pregnancy-induced hypertension. Complications include hyperthyroidism, infection, DIC, theca lutein cysts in the ovaries, and trophoblastic embolization to the lungs. Treatment begins with uterus evacuation via suction or D&C (if over $16$ weeks). Hysterectomy may be recommended for women who have completed their families to reduce malignancy risk.

Midwifery Management and Follow-up for GTD

Post-evacuation follow-up for Hydatidiform Mole is vital. hCG levels must be checked every $2-4$ weeks until they reach normal levels, then every $1-2$ months for a period of $6$ to $12$ months. For Gestational Trophoblastic Neoplasia (GTN), chemotherapy is the primary treatment, with surgery reserved for chemotherapy-resistant structures. Follow-up continues for at least a year of remission, as recurrence after one year is less than $1\%$. Pregnancy should be postponed for at least $12$ months after biochemical remission ($1$ year for low-risk, $2$ years for high-risk cases). Oral contraceptives are not contraindicated but should only be started once hCG levels have returned to completely normal.